merge changes for storm-1920

9 files changed, 546 insertions, 407 deletions

diff --git a/indra/llmath/llmath.h b/indra/llmath/llmath.h
index b93f89d674..5abd9a0d06 100755
--- a/indra/llmath/llmath.h
+++ b/indra/llmath/llmath.h
@@ -72,6 +72,7 @@ const F32	F_E			= 2.71828182845904523536f;
 const F32	F_SQRT2		= 1.4142135623730950488016887242097f;
 const F32	F_SQRT3		= 1.73205080756888288657986402541f;
 const F32	OO_SQRT2	= 0.7071067811865475244008443621049f;
+const F32	OO_SQRT3	= 0.577350269189625764509f;
 const F32	DEG_TO_RAD	= 0.017453292519943295769236907684886f;
 const F32	RAD_TO_DEG	= 57.295779513082320876798154814105f;
 const F32	F_APPROXIMATELY_ZERO = 0.00001f;
diff --git a/indra/llmath/v3dmath.h b/indra/llmath/v3dmath.h
index 578dcdc8ea..4938273d5b 100755
--- a/indra/llmath/v3dmath.h
+++ b/indra/llmath/v3dmath.h
@@ -72,17 +72,22 @@ class LLVector3d
 		BOOL		clamp(const F64 min, const F64 max);		// Clamps all values to (min,max), returns TRUE if data changed
 		BOOL		abs();						// sets all values to absolute value of original value (first octant), returns TRUE if changed
 
-		inline const LLVector3d&	clearVec();		// Clears LLVector3d to (0, 0, 0, 1)
+		inline const LLVector3d&	clear();		// Clears LLVector3d to (0, 0, 0, 1)
+		inline const LLVector3d&	clearVec();		// deprecated
 		inline const LLVector3d&	setZero();		// Zero LLVector3d to (0, 0, 0, 0)
 		inline const LLVector3d&	zeroVec();		// deprecated
-		inline const LLVector3d&	setVec(const F64 x, const F64 y, const F64 z);	// Sets LLVector3d to (x, y, z, 1)
-		inline const LLVector3d&	setVec(const LLVector3d &vec);	// Sets LLVector3d to vec
-		inline const LLVector3d&	setVec(const F64 *vec);			// Sets LLVector3d to vec
-		inline const LLVector3d&	setVec(const LLVector3 &vec);
-
-		F64		magVec() const;				// Returns magnitude of LLVector3d
-		F64		magVecSquared() const;		// Returns magnitude squared of LLVector3d
-		inline F64		normVec();					// Normalizes and returns the magnitude of LLVector3d
+		inline const LLVector3d&	set(const F64 x, const F64 y, const F64 z);	// Sets LLVector3d to (x, y, z, 1)
+		inline const LLVector3d&	set(const LLVector3d &vec);	// Sets LLVector3d to vec
+		inline const LLVector3d&	set(const F64 *vec);		// Sets LLVector3d to vec
+		inline const LLVector3d&	set(const LLVector3 &vec);
+		inline const LLVector3d&	setVec(const F64 x, const F64 y, const F64 z);	// deprecated
+		inline const LLVector3d&	setVec(const LLVector3d &vec);	// deprecated
+		inline const LLVector3d&	setVec(const F64 *vec);			// deprecated
+		inline const LLVector3d&	setVec(const LLVector3 &vec);	// deprecated
+
+		F64		magVec() const;				// deprecated
+		F64		magVecSquared() const;		// deprecated
+		inline F64		normVec();					// deprecated
 
 		F64 length() const;			// Returns magnitude of LLVector3d
 		F64 lengthSquared() const;	// Returns magnitude squared of LLVector3d
@@ -101,25 +106,25 @@ class LLVector3d
 		F64 operator[](int idx) const { return mdV[idx]; }
 		F64 &operator[](int idx) { return mdV[idx]; }
 
-		friend LLVector3d operator+(const LLVector3d &a, const LLVector3d &b);	// Return vector a + b
-		friend LLVector3d operator-(const LLVector3d &a, const LLVector3d &b);	// Return vector a minus b
-		friend F64 operator*(const LLVector3d &a, const LLVector3d &b);		// Return a dot b
-		friend LLVector3d operator%(const LLVector3d &a, const LLVector3d &b);	// Return a cross b
-		friend LLVector3d operator*(const LLVector3d &a, const F64 k);				// Return a times scaler k
-		friend LLVector3d operator/(const LLVector3d &a, const F64 k);				// Return a divided by scaler k
-		friend LLVector3d operator*(const F64 k, const LLVector3d &a);				// Return a times scaler k
-		friend bool operator==(const LLVector3d &a, const LLVector3d &b);		// Return a == b
-		friend bool operator!=(const LLVector3d &a, const LLVector3d &b);		// Return a != b
+		friend LLVector3d operator+(const LLVector3d& a, const LLVector3d& b);	// Return vector a + b
+		friend LLVector3d operator-(const LLVector3d& a, const LLVector3d& b);	// Return vector a minus b
+		friend F64 operator*(const LLVector3d& a, const LLVector3d& b);		// Return a dot b
+		friend LLVector3d operator%(const LLVector3d& a, const LLVector3d& b);	// Return a cross b
+		friend LLVector3d operator*(const LLVector3d& a, const F64 k);				// Return a times scaler k
+		friend LLVector3d operator/(const LLVector3d& a, const F64 k);				// Return a divided by scaler k
+		friend LLVector3d operator*(const F64 k, const LLVector3d& a);				// Return a times scaler k
+		friend bool operator==(const LLVector3d& a, const LLVector3d& b);		// Return a == b
+		friend bool operator!=(const LLVector3d& a, const LLVector3d& b);		// Return a != b
 
-		friend const LLVector3d& operator+=(LLVector3d &a, const LLVector3d &b);	// Return vector a + b
-		friend const LLVector3d& operator-=(LLVector3d &a, const LLVector3d &b);	// Return vector a minus b
-		friend const LLVector3d& operator%=(LLVector3d &a, const LLVector3d &b);	// Return a cross b
-		friend const LLVector3d& operator*=(LLVector3d &a, const F64 k);				// Return a times scaler k
-		friend const LLVector3d& operator/=(LLVector3d &a, const F64 k);				// Return a divided by scaler k
+		friend const LLVector3d& operator+=(LLVector3d& a, const LLVector3d& b);	// Return vector a + b
+		friend const LLVector3d& operator-=(LLVector3d& a, const LLVector3d& b);	// Return vector a minus b
+		friend const LLVector3d& operator%=(LLVector3d& a, const LLVector3d& b);	// Return a cross b
+		friend const LLVector3d& operator*=(LLVector3d& a, const F64 k);				// Return a times scaler k
+		friend const LLVector3d& operator/=(LLVector3d& a, const F64 k);				// Return a divided by scaler k
 
-		friend LLVector3d operator-(const LLVector3d &a);					// Return vector -a
+		friend LLVector3d operator-(const LLVector3d& a);					// Return vector -a
 
-		friend std::ostream&	 operator<<(std::ostream& s, const LLVector3d &a);		// Stream a
+		friend std::ostream&	 operator<<(std::ostream& s, const LLVector3d& a);		// Stream a
 
 		static BOOL parseVector3d(const std::string& buf, LLVector3d* value);
 
@@ -127,7 +132,15 @@ class LLVector3d
 
 typedef LLVector3d LLGlobalVec;
 
-const LLVector3d &LLVector3d::setVec(const LLVector3 &vec)
+inline const LLVector3d &LLVector3d::set(const LLVector3 &vec)
+{
+	mdV[0] = vec.mV[0];
+	mdV[1] = vec.mV[1];
+	mdV[2] = vec.mV[2];
+	return *this;
+}
+
+inline const LLVector3d &LLVector3d::setVec(const LLVector3 &vec)
 {
 	mdV[0] = vec.mV[0];
 	mdV[1] = vec.mV[1];
@@ -184,6 +197,14 @@ inline BOOL LLVector3d::isFinite() const
 
 // Clear and Assignment Functions
 
+inline const LLVector3d&	LLVector3d::clear(void)
+{
+	mdV[0] = 0.f;
+	mdV[1] = 0.f;
+	mdV[2]= 0.f;
+	return (*this);
+}
+
 inline const LLVector3d&	LLVector3d::clearVec(void)
 {
 	mdV[0] = 0.f;
@@ -208,6 +229,30 @@ inline const LLVector3d&	LLVector3d::zeroVec(void)
 	return (*this);
 }
 
+inline const LLVector3d&	LLVector3d::set(const F64 x, const F64 y, const F64 z)
+{
+	mdV[VX] = x;
+	mdV[VY] = y;
+	mdV[VZ] = z;
+	return (*this);
+}
+
+inline const LLVector3d&	LLVector3d::set(const LLVector3d &vec)
+{
+	mdV[0] = vec.mdV[0];
+	mdV[1] = vec.mdV[1];
+	mdV[2] = vec.mdV[2];
+	return (*this);
+}
+
+inline const LLVector3d&	LLVector3d::set(const F64 *vec)
+{
+	mdV[0] = vec[0];
+	mdV[1] = vec[1];
+	mdV[2] = vec[2];
+	return (*this);
+}
+
 inline const LLVector3d&	LLVector3d::setVec(const F64 x, const F64 y, const F64 z)
 {
 	mdV[VX] = x;
@@ -298,59 +343,59 @@ inline F64	LLVector3d::lengthSquared(void) const
 	return mdV[0]*mdV[0] + mdV[1]*mdV[1] + mdV[2]*mdV[2];
 }
 
-inline LLVector3d operator+(const LLVector3d &a, const LLVector3d &b)
+inline LLVector3d operator+(const LLVector3d& a, const LLVector3d& b)
 {
 	LLVector3d c(a);
 	return c += b;
 }
 
-inline LLVector3d operator-(const LLVector3d &a, const LLVector3d &b)
+inline LLVector3d operator-(const LLVector3d& a, const LLVector3d& b)
 {
 	LLVector3d c(a);
 	return c -= b;
 }
 
-inline F64  operator*(const LLVector3d &a, const LLVector3d &b)
+inline F64  operator*(const LLVector3d& a, const LLVector3d& b)
 {
 	return (a.mdV[0]*b.mdV[0] + a.mdV[1]*b.mdV[1] + a.mdV[2]*b.mdV[2]);
 }
 
-inline LLVector3d operator%(const LLVector3d &a, const LLVector3d &b)
+inline LLVector3d operator%(const LLVector3d& a, const LLVector3d& b)
 {
 	return LLVector3d( a.mdV[1]*b.mdV[2] - b.mdV[1]*a.mdV[2], a.mdV[2]*b.mdV[0] - b.mdV[2]*a.mdV[0], a.mdV[0]*b.mdV[1] - b.mdV[0]*a.mdV[1] );
 }
 
-inline LLVector3d operator/(const LLVector3d &a, const F64 k)
+inline LLVector3d operator/(const LLVector3d& a, const F64 k)
 {
 	F64 t = 1.f / k;
 	return LLVector3d( a.mdV[0] * t, a.mdV[1] * t, a.mdV[2] * t );
 }
 
-inline LLVector3d operator*(const LLVector3d &a, const F64 k)
+inline LLVector3d operator*(const LLVector3d& a, const F64 k)
 {
 	return LLVector3d( a.mdV[0] * k, a.mdV[1] * k, a.mdV[2] * k );
 }
 
-inline LLVector3d operator*(F64 k, const LLVector3d &a)
+inline LLVector3d operator*(F64 k, const LLVector3d& a)
 {
 	return LLVector3d( a.mdV[0] * k, a.mdV[1] * k, a.mdV[2] * k );
 }
 
-inline bool operator==(const LLVector3d &a, const LLVector3d &b)
+inline bool operator==(const LLVector3d& a, const LLVector3d& b)
 {
 	return (  (a.mdV[0] == b.mdV[0])
 			&&(a.mdV[1] == b.mdV[1])
 			&&(a.mdV[2] == b.mdV[2]));
 }
 
-inline bool operator!=(const LLVector3d &a, const LLVector3d &b)
+inline bool operator!=(const LLVector3d& a, const LLVector3d& b)
 {
 	return (  (a.mdV[0] != b.mdV[0])
 			||(a.mdV[1] != b.mdV[1])
 			||(a.mdV[2] != b.mdV[2]));
 }
 
-inline const LLVector3d& operator+=(LLVector3d &a, const LLVector3d &b)
+inline const LLVector3d& operator+=(LLVector3d& a, const LLVector3d& b)
 {
 	a.mdV[0] += b.mdV[0];
 	a.mdV[1] += b.mdV[1];
@@ -358,7 +403,7 @@ inline const LLVector3d& operator+=(LLVector3d &a, const LLVector3d &b)
 	return a;
 }
 
-inline const LLVector3d& operator-=(LLVector3d &a, const LLVector3d &b)
+inline const LLVector3d& operator-=(LLVector3d& a, const LLVector3d& b)
 {
 	a.mdV[0] -= b.mdV[0];
 	a.mdV[1] -= b.mdV[1];
@@ -366,14 +411,14 @@ inline const LLVector3d& operator-=(LLVector3d &a, const LLVector3d &b)
 	return a;
 }
 
-inline const LLVector3d& operator%=(LLVector3d &a, const LLVector3d &b)
+inline const LLVector3d& operator%=(LLVector3d& a, const LLVector3d& b)
 {
 	LLVector3d ret( a.mdV[1]*b.mdV[2] - b.mdV[1]*a.mdV[2], a.mdV[2]*b.mdV[0] - b.mdV[2]*a.mdV[0], a.mdV[0]*b.mdV[1] - b.mdV[0]*a.mdV[1]);
 	a = ret;
 	return a;
 }
 
-inline const LLVector3d& operator*=(LLVector3d &a, const F64 k)
+inline const LLVector3d& operator*=(LLVector3d& a, const F64 k)
 {
 	a.mdV[0] *= k;
 	a.mdV[1] *= k;
@@ -381,7 +426,7 @@ inline const LLVector3d& operator*=(LLVector3d &a, const F64 k)
 	return a;
 }
 
-inline const LLVector3d& operator/=(LLVector3d &a, const F64 k)
+inline const LLVector3d& operator/=(LLVector3d& a, const F64 k)
 {
 	F64 t = 1.f / k;
 	a.mdV[0] *= t;
@@ -390,12 +435,12 @@ inline const LLVector3d& operator/=(LLVector3d &a, const F64 k)
 	return a;
 }
 
-inline LLVector3d operator-(const LLVector3d &a)
+inline LLVector3d operator-(const LLVector3d& a)
 {
 	return LLVector3d( -a.mdV[0], -a.mdV[1], -a.mdV[2] );
 }
 
-inline F64	dist_vec(const LLVector3d &a, const LLVector3d &b)
+inline F64	dist_vec(const LLVector3d& a, const LLVector3d& b)
 {
 	F64 x = a.mdV[0] - b.mdV[0];
 	F64 y = a.mdV[1] - b.mdV[1];
@@ -403,7 +448,7 @@ inline F64	dist_vec(const LLVector3d &a, const LLVector3d &b)
 	return (F32) sqrt( x*x + y*y + z*z );
 }
 
-inline F64	dist_vec_squared(const LLVector3d &a, const LLVector3d &b)
+inline F64	dist_vec_squared(const LLVector3d& a, const LLVector3d& b)
 {
 	F64 x = a.mdV[0] - b.mdV[0];
 	F64 y = a.mdV[1] - b.mdV[1];
@@ -411,14 +456,14 @@ inline F64	dist_vec_squared(const LLVector3d &a, const LLVector3d &b)
 	return x*x + y*y + z*z;
 }
 
-inline F64	dist_vec_squared2D(const LLVector3d &a, const LLVector3d &b)
+inline F64	dist_vec_squared2D(const LLVector3d& a, const LLVector3d& b)
 {
 	F64 x = a.mdV[0] - b.mdV[0];
 	F64 y = a.mdV[1] - b.mdV[1];
 	return x*x + y*y;
 }
 
-inline LLVector3d lerp(const LLVector3d &a, const LLVector3d &b, const F64 u)
+inline LLVector3d lerp(const LLVector3d& a, const LLVector3d& b, const F64 u)
 {
 	return LLVector3d(
 		a.mdV[VX] + (b.mdV[VX] - a.mdV[VX]) * u,
@@ -450,7 +495,7 @@ inline F64 angle_between(const LLVector3d& a, const LLVector3d& b)
 	return angle;
 }
 
-inline BOOL are_parallel(const LLVector3d &a, const LLVector3d &b, const F64 epsilon)
+inline BOOL are_parallel(const LLVector3d& a, const LLVector3d& b, const F64 epsilon)
 {
 	LLVector3d an = a;
 	LLVector3d bn = b;
@@ -465,11 +510,22 @@ inline BOOL are_parallel(const LLVector3d &a, const LLVector3d &b, const F64 eps
 
 }
 
-inline LLVector3d projected_vec(const LLVector3d &a, const LLVector3d &b)
+inline LLVector3d projected_vec(const LLVector3d& a, const LLVector3d& b)
 {
 	LLVector3d project_axis = b;
 	project_axis.normalize();
 	return project_axis * (a * project_axis);
 }
 
+inline LLVector3d inverse_projected_vec(const LLVector3d& a, const LLVector3d& b)
+{
+	LLVector3d normalized_a = a;
+	normalized_a.normalize();
+	LLVector3d normalized_b = b;
+	F64 b_length = normalized_b.normalize();
+
+	F64 dot_product = normalized_a * normalized_b;
+	return normalized_a * (b_length / dot_product);
+}
+
 #endif // LL_V3DMATH_H
diff --git a/indra/llmath/v3math.h b/indra/llmath/v3math.h
index 0432aeba4c..1461cd57b6 100755
--- a/indra/llmath/v3math.h
+++ b/indra/llmath/v3math.h
@@ -159,6 +159,7 @@ F32	dist_vec(const LLVector3 &a, const LLVector3 &b);		// Returns distance betwe
 F32	dist_vec_squared(const LLVector3 &a, const LLVector3 &b);// Returns distance squared between a and b
 F32	dist_vec_squared2D(const LLVector3 &a, const LLVector3 &b);// Returns distance squared between a and b ignoring Z component
 LLVector3 projected_vec(const LLVector3 &a, const LLVector3 &b); // Returns vector a projected on vector b
+LLVector3 inverse_projected_vec(const LLVector3 &a, const LLVector3 &b); // Returns vector a scaled such that projected_vec(inverse_projected_vec(a, b), b) == b;
 LLVector3 parallel_component(const LLVector3 &a, const LLVector3 &b); // Returns vector a projected on vector b (same as projected_vec)
 LLVector3 orthogonal_component(const LLVector3 &a, const LLVector3 &b); // Returns component of vector a not parallel to vector b (same as projected_vec)
 LLVector3 lerp(const LLVector3 &a, const LLVector3 &b, F32 u); // Returns a vector that is a linear interpolation between a and b
@@ -495,6 +496,18 @@ inline LLVector3 projected_vec(const LLVector3 &a, const LLVector3 &b)
 	return project_axis * (a * project_axis);
 }
 
+inline LLVector3 inverse_projected_vec(const LLVector3& a, const LLVector3& b)
+{
+	LLVector3 normalized_a = a;
+	normalized_a.normalize();
+	LLVector3 normalized_b = b;
+	F32 b_length = normalized_b.normalize();
+
+	F32 dot_product = normalized_a * normalized_b;
+	//NB: if a _|_ b, then returns an infinite vector
+	return normalized_a * (b_length / dot_product);
+}
+
 inline LLVector3 parallel_component(const LLVector3 &a, const LLVector3 &b)
 {
 	return projected_vec(a, b);
diff --git a/indra/newview/llmaniprotate.cpp b/indra/newview/llmaniprotate.cpp
index 4cbdfde868..bd21d04b4a 100755
--- a/indra/newview/llmaniprotate.cpp
+++ b/indra/newview/llmaniprotate.cpp
@@ -61,6 +61,7 @@
 #include "llglheaders.h"
 #include "lltrans.h"
 #include "llvoavatarself.h"
+#include "llhudrender.h"
 
 const F32 RADIUS_PIXELS = 100.f;		// size in screen space
 const F32 SQ_RADIUS = RADIUS_PIXELS * RADIUS_PIXELS;
@@ -452,6 +453,9 @@ BOOL LLManipRotate::handleMouseDownOnPart( S32 x, S32 y, MASK mask )
 	// Route future Mouse messages here preemptively.  (Release on mouse up.)
 	setMouseCapture( TRUE );
 	LLSelectMgr::getInstance()->enableSilhouette(FALSE);
+
+	mHelpTextTimer.reset();
+	sNumTimesHelpTextShown++;
 	return TRUE;
 }
 
@@ -1111,6 +1115,31 @@ void LLManipRotate::renderSnapGuides()
 			}
 		}
 	}
+
+
+	// render help text
+	if (mObjectSelection->getSelectType() != SELECT_TYPE_HUD)
+	{
+		if (mHelpTextTimer.getElapsedTimeF32() < sHelpTextVisibleTime + sHelpTextFadeTime && sNumTimesHelpTextShown < sMaxTimesShowHelpText)
+		{
+			LLVector3 selection_center_start = LLSelectMgr::getInstance()->getSavedBBoxOfSelection().getCenterAgent();
+
+			LLVector3 offset_dir = LLViewerCamera::getInstance()->getUpAxis();
+
+			F32 line_alpha = gSavedSettings.getF32("GridOpacity");
+
+			LLVector3 help_text_pos = selection_center_start + (mRadiusMeters * 3.f * offset_dir);
+			const LLFontGL* big_fontp = LLFontGL::getFontSansSerif();
+
+			std::string help_text =  LLTrans::getString("manip_hint1");
+			LLColor4 help_text_color = LLColor4::white;
+			help_text_color.mV[VALPHA] = clamp_rescale(mHelpTextTimer.getElapsedTimeF32(), sHelpTextVisibleTime, sHelpTextVisibleTime + sHelpTextFadeTime, line_alpha, 0.f);
+			hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, false);
+			help_text =  LLTrans::getString("manip_hint2");
+			help_text_pos -= offset_dir * mRadiusMeters * 0.4f;
+			hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, false);
+		}
+	}
 }
 
 // Returns TRUE if center of sphere is visible.  Also sets a bunch of member variables that are used later (e.g. mCenterToCam)
diff --git a/indra/newview/llmanipscale.cpp b/indra/newview/llmanipscale.cpp
index ae0884ac5d..6dc03d8382 100755
--- a/indra/newview/llmanipscale.cpp
+++ b/indra/newview/llmanipscale.cpp
@@ -59,7 +59,7 @@
 #include "v2math.h"
 #include "llvoavatar.h"
 #include "llmeshrepository.h"
-
+#include "lltrans.h"
 
 const F32 MAX_MANIP_SELECT_DISTANCE_SQUARED = 11.f * 11.f;
 const F32 SNAP_GUIDE_SCREEN_OFFSET = 0.05f;
@@ -68,7 +68,7 @@ const F32 SELECTED_MANIPULATOR_SCALE = 1.2f;
 const F32 MANIPULATOR_SCALE_HALF_LIFE = 0.07f;
 const S32 NUM_MANIPULATORS = 14;
 
-const LLManip::EManipPart MANIPULATOR_IDS[NUM_MANIPULATORS] = 
+const LLManip::EManipPart MANIPULATOR_IDS[NUM_MANIPULATORS] =
 {
 	LLManip::LL_CORNER_NNN,
 	LLManip::LL_CORNER_NNP,
@@ -87,7 +87,7 @@ const LLManip::EManipPart MANIPULATOR_IDS[NUM_MANIPULATORS] =
 };
 
 
-F32 get_default_max_prim_scale(bool is_flora) 
+F32 get_default_max_prim_scale(bool is_flora)
 {
 	// a bit of a hack, but if it's foilage, we don't want to use the
 	// new larger scale which would result in giant trees and grass
@@ -97,7 +97,7 @@ F32 get_default_max_prim_scale(bool is_flora)
 		return DEFAULT_MAX_PRIM_SCALE;
 	}
 	else
-	{	
+	{
 		return DEFAULT_MAX_PRIM_SCALE_NO_MESH;
 	}
 }
@@ -179,7 +179,7 @@ void LLManipScale::handleSelect()
 }
 
 LLManipScale::LLManipScale( LLToolComposite* composite )
-	: 
+	:
 	LLManip( std::string("Scale"), composite ),
 	mBoxHandleSize( 1.f ),
 	mScaledBoxHandleSize( 1.f ),
@@ -190,10 +190,12 @@ LLManipScale::LLManipScale( LLToolComposite* composite )
 	mScaleSnapUnit1(1.f),
 	mScaleSnapUnit2(1.f),
 	mSnapRegimeOffset(0.f),
+	mTickPixelSpacing1(0.f),
+	mTickPixelSpacing2(0.f),
 	mSnapGuideLength(0.f),
-	mInSnapRegime(FALSE),
-	mScaleSnapValue(0.f)
-{ 
+	mSnapRegime(SNAP_REGIME_NONE),
+	mScaleSnappedValue(0.f)
+{
 	mManipulatorScales = new F32[NUM_MANIPULATORS];
 	for (S32 i = 0; i < NUM_MANIPULATORS; i++)
 	{
@@ -214,7 +216,7 @@ void LLManipScale::render()
 	LLGLDepthTest gls_depth(GL_TRUE);
 	LLGLEnable gl_blend(GL_BLEND);
 	LLGLEnable gls_alpha_test(GL_ALPHA_TEST);
-	
+
 	if( canAffectSelection() )
 	{
 		gGL.matrixMode(LLRender::MM_MODELVIEW);
@@ -226,11 +228,11 @@ void LLManipScale::render()
 		}
 
 		////////////////////////////////////////////////////////////////////////
-		// Calculate size of drag handles 	
+		// Calculate size of drag handles
 
 		const F32 BOX_HANDLE_BASE_SIZE		= 50.0f;   // box size in pixels = BOX_HANDLE_BASE_SIZE * BOX_HANDLE_BASE_FACTOR
 		const F32 BOX_HANDLE_BASE_FACTOR	= 0.2f;
-		
+
 		LLVector3 center_agent = gAgent.getPosAgentFromGlobal(LLSelectMgr::getInstance()->getSelectionCenterGlobal());
 
 		if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
@@ -283,7 +285,7 @@ void LLManipScale::render()
 			rot.getAngleAxis(&angle_radians, &x, &y, &z);
 			gGL.rotatef(angle_radians * RAD_TO_DEG, x, y, z);
 
-			
+
 			{
 				LLGLEnable poly_offset(GL_POLYGON_OFFSET_FILL);
 				glPolygonOffset( -2.f, -2.f);
@@ -345,7 +347,7 @@ BOOL LLManipScale::handleMouseDownOnPart( S32 x, S32 y, MASK mask )
 	LLBBox bbox = LLSelectMgr::getInstance()->getBBoxOfSelection();
 	LLVector3 box_center_agent = bbox.getCenterAgent();
 	LLVector3 box_corner_agent = bbox.localToAgent( unitVectorToLocalBBoxExtent( partToUnitVector( mManipPart ), bbox ) );
-	
+
 	updateSnapGuides(bbox);
 
 	mDragStartPointGlobal = gAgent.getPosGlobalFromAgent(box_corner_agent);
@@ -372,27 +374,27 @@ BOOL LLManipScale::handleMouseUp(S32 x, S32 y, MASK mask)
 
 	if( hasMouseCapture() )
 	{
-		if( (LL_FACE_MIN <= (S32)mManipPart) 
+		if( (LL_FACE_MIN <= (S32)mManipPart)
 			&& ((S32)mManipPart <= LL_FACE_MAX) )
 		{
 			sendUpdates(TRUE,TRUE,FALSE);
 		}
 		else
-		if( (LL_CORNER_MIN <= (S32)mManipPart) 
+		if( (LL_CORNER_MIN <= (S32)mManipPart)
 			&& ((S32)mManipPart <= LL_CORNER_MAX) )
 		{
 			sendUpdates(TRUE,TRUE,TRUE);
 		}
-		
+
 		//send texture update
 		LLSelectMgr::getInstance()->adjustTexturesByScale(TRUE, getStretchTextures());
-		
+
 		LLSelectMgr::getInstance()->enableSilhouette(TRUE);
 		mManipPart = LL_NO_PART;
 
 		// Might have missed last update due to UPDATE_DELAY timing
 		LLSelectMgr::getInstance()->sendMultipleUpdate( mLastUpdateFlags );
-		
+
 		//gAgent.setObjectTracking(gSavedSettings.getBOOL("TrackFocusObject"));
 		LLSelectMgr::getInstance()->saveSelectedObjectTransform(SELECT_ACTION_TYPE_PICK);
 	}
@@ -413,15 +415,15 @@ BOOL LLManipScale::handleHover(S32 x, S32 y, MASK mask)
 		{
 			drag( x, y );
 		}
-		lldebugst(LLERR_USER_INPUT) << "hover handled by LLManipScale (active)" << llendl;		
+		lldebugst(LLERR_USER_INPUT) << "hover handled by LLManipScale (active)" << llendl;
 	}
 	else
 	{
-		mInSnapRegime = FALSE;
+		mSnapRegime = SNAP_REGIME_NONE;
 		// not dragging...
 		highlightManipulators(x, y);
 	}
-	
+
 	// Patch up textures, if possible.
 	LLSelectMgr::getInstance()->adjustTexturesByScale(FALSE, getStretchTextures());
 
@@ -458,7 +460,7 @@ void LLManipScale::highlightManipulators(S32 x, S32 y)
 			LLMatrix4 projMatrix = LLViewerCamera::getInstance()->getProjection();
 			LLMatrix4 modelView = LLViewerCamera::getInstance()->getModelview();
 			transform.initAll(LLVector3(1.f, 1.f, 1.f), bbox.getRotation(), bbox.getPositionAgent());
-			
+
 			transform *= modelView;
 			transform *= projMatrix;
 		}
@@ -477,7 +479,7 @@ void LLManipScale::highlightManipulators(S32 x, S32 y)
 		mManipulatorVertices[numManips++] = LLVector4(max.mV[VX], min.mV[VY], max.mV[VZ], 1.f);
 		mManipulatorVertices[numManips++] = LLVector4(max.mV[VX], max.mV[VY], min.mV[VZ], 1.f);
 		mManipulatorVertices[numManips++] = LLVector4(max.mV[VX], max.mV[VY], max.mV[VZ], 1.f);
-		
+
 		// 1-D highlights are applicable iff one object is selected
 		if( mObjectSelection->getObjectCount() == 1 )
 		{
@@ -492,13 +494,13 @@ void LLManipScale::highlightManipulators(S32 x, S32 y)
 
 		for_each(mProjectedManipulators.begin(), mProjectedManipulators.end(), DeletePointer());
 		mProjectedManipulators.clear();
-		
+
 		for (S32 i = 0; i < numManips; i++)
 		{
 			LLVector4 projectedVertex = mManipulatorVertices[i] * transform;
 			projectedVertex = projectedVertex * (1.f / projectedVertex.mV[VW]);
 
-			ManipulatorHandle* projManipulator = new ManipulatorHandle(LLVector3(projectedVertex.mV[VX], projectedVertex.mV[VY], 
+			ManipulatorHandle* projManipulator = new ManipulatorHandle(LLVector3(projectedVertex.mV[VX], projectedVertex.mV[VY],
 				projectedVertex.mV[VZ]), MANIPULATOR_IDS[i], (i < 7) ? SCALE_MANIP_CORNER : SCALE_MANIP_FACE);
 			mProjectedManipulators.insert(projManipulator);
 		}
@@ -512,13 +514,13 @@ void LLManipScale::highlightManipulators(S32 x, S32 y)
 
 		mHighlightedPart = LL_NO_PART;
 
-		for (minpulator_list_t::iterator iter = mProjectedManipulators.begin();
+		for (manipulator_list_t::iterator iter = mProjectedManipulators.begin();
 			 iter != mProjectedManipulators.end(); ++iter)
 		{
 			ManipulatorHandle* manipulator = *iter;
 			{
-				manip2d.setVec(manipulator->mPosition.mV[VX] * half_width, manipulator->mPosition.mV[VY] * half_height);
-				
+				manip2d.set(manipulator->mPosition.mV[VX] * half_width, manipulator->mPosition.mV[VY] * half_height);
+
 				delta = manip2d - mousePos;
 				if (delta.magVecSquared() < MAX_MANIP_SELECT_DISTANCE_SQUARED)
 				{
@@ -549,36 +551,36 @@ void LLManipScale::highlightManipulators(S32 x, S32 y)
 
 void LLManipScale::renderFaces( const LLBBox& bbox )
 {
-	// Don't bother to render the drag handles for 1-D scaling if 
+	// Don't bother to render the drag handles for 1-D scaling if
 	// more than one object is selected or if it is an attachment
 	if ( mObjectSelection->getObjectCount() > 1 )
 	{
 		return;
 	}
 
-    // This is a flattened representation of the box as render here
-    //                                       .
-    //              (+++)        (++-)      /|\t
-    //                +------------+         | (texture coordinates)
-    //                |            |         |
-    //                |     1      |        (*) --->s
-    //                |    +X      |   
+	// This is a flattened representation of the box as render here
+	//                                       .
+	//              (+++)        (++-)      /|\t
+	//                +------------+         | (texture coordinates)
+	//                |            |         |
+	//                |     1      |        (*) --->s
+	//                |    +X      |
 	//                |            |
-    // (+++)     (+-+)|            |(+--)     (++-)        (+++)
-    //   +------------+------------+------------+------------+
-    //   |0          3|3          7|7          4|4          0|
-    //   |     0      |     4      |     5      |     2	     |
-    //   |    +Z      |    -Y      |    -Z      |    +Y      |
-    //   |	          |            |            |            |
-    //   |1          2|2          6|6          5|5          1|
-    //   +------------+------------+------------+------------+
-    // (-++)     (--+)|            |(---)     (-+-)        (-++)
-    //                |     3      |
-    //                |    -X      |
-    //                |            |
-    //                |            |
-    //                +------------+
-    //              (-++)        (-+-)
+	// (+++)     (+-+)|            |(+--)     (++-)        (+++)
+	//   +------------+------------+------------+------------+
+	//   |0          3|3          7|7          4|4          0|
+	//   |     0      |     4      |     5      |     2	     |
+	//   |    +Z      |    -Y      |    -Z      |    +Y      |
+	//   |	          |            |            |            |
+	//   |1          2|2          6|6          5|5          1|
+	//   +------------+------------+------------+------------+
+	// (-++)     (--+)|            |(---)     (-+-)        (-++)
+	//                |     3      |
+	//                |    -X      |
+	//                |            |
+	//                |            |
+	//                +------------+
+	//              (-++)        (-+-)
 
 	LLColor4 highlight_color( 1.f, 1.f, 1.f, 0.5f);
 	LLColor4 normal_color(	1.f, 1.f, 1.f, 0.3f);
@@ -602,7 +604,7 @@ void LLManipScale::renderFaces( const LLBBox& bbox )
 	{
 		gGL.color4fv( default_normal_color.mV );
 		LLGLDepthTest gls_depth(GL_FALSE);
-		gGL.begin(LLRender::QUADS); 
+		gGL.begin(LLRender::QUADS);
 		{
 			// Face 0
 			gGL.vertex3f(min.mV[VX], max.mV[VY], max.mV[VZ]);
@@ -645,9 +647,9 @@ void LLManipScale::renderFaces( const LLBBox& bbox )
 
 	// Find nearest vertex
 	LLVector3 orientWRTHead = bbox.agentToLocalBasis( bbox.getCenterAgent() - gAgentCamera.getCameraPositionAgent() );
-	U32 nearest = 
-		(orientWRTHead.mV[0] < 0.0f ? 1 : 0) + 
-		(orientWRTHead.mV[1] < 0.0f ? 2 : 0) + 
+	U32 nearest =
+		(orientWRTHead.mV[0] < 0.0f ? 1 : 0) +
+		(orientWRTHead.mV[1] < 0.0f ? 2 : 0) +
 		(orientWRTHead.mV[2] < 0.0f ? 4 : 0);
 
 	// opposite faces on Linden cubes:
@@ -656,7 +658,7 @@ void LLManipScale::renderFaces( const LLBBox& bbox )
 	// 2 & 4
 
 	// Table of order to draw faces, based on nearest vertex
-	static U32 face_list[8][6] = { 
+	static U32 face_list[8][6] = {
 		{ 2,0,1, 4,5,3 }, // v6  F201 F453
 		{ 2,0,3, 4,5,1 }, // v7  F203 F451
 		{ 4,0,1, 2,5,3 }, // v5  F401 F253
@@ -723,7 +725,7 @@ void LLManipScale::renderEdges( const LLBBox& bbox )
 		{
 			gGL.translatef( center_to_edge.mV[0], center_to_edge.mV[1], center_to_edge.mV[2] );
 			conditionalHighlight( part );
-			gGL.scalef( 
+			gGL.scalef(
 				direction.mV[0] ? edge_width : extent.mV[VX],
 				direction.mV[1] ? edge_width : extent.mV[VY],
 				direction.mV[2] ? edge_width : extent.mV[VZ] );
@@ -757,7 +759,7 @@ void LLManipScale::renderCorners( const LLBBox& bbox )
 			y_offset = bbox.getMaxLocal().mV[VY];
 		}
 		x_offset = bbox.getMaxLocal().mV[VX];
-  }
+	}
 }
 
 
@@ -782,7 +784,7 @@ void LLManipScale::renderAxisHandle( const LLVector3& start, const LLVector3& en
 	{
 		// Draws a single "jacks" style handle: a long, retangular box from start to end.
 		LLVector3 offset_start = end - start;
-		offset_start.normVec();
+		offset_start.normalize();
 		offset_start = start + mBoxHandleSize * offset_start;
 
 		LLVector3 delta = end - offset_start;
@@ -791,7 +793,7 @@ void LLManipScale::renderAxisHandle( const LLVector3& start, const LLVector3& en
 		gGL.pushMatrix();
 		{
 			gGL.translatef( pos.mV[VX], pos.mV[VY], pos.mV[VZ] );
-			gGL.scalef( 
+			gGL.scalef(
 				mBoxHandleSize + llabs(delta.mV[VX]),
 				mBoxHandleSize + llabs(delta.mV[VY]),
 				mBoxHandleSize + llabs(delta.mV[VZ]));
@@ -805,21 +807,20 @@ void LLManipScale::renderAxisHandle( const LLVector3& start, const LLVector3& en
 	}
 }
 
-
+// General scale call
 void LLManipScale::drag( S32 x, S32 y )
 {
-	if( (LL_FACE_MIN <= (S32)mManipPart) 
+	if( (LL_FACE_MIN <= (S32)mManipPart)
 		&& ((S32)mManipPart <= LL_FACE_MAX) )
 	{
 		dragFace( x, y );
 	}
-	else
-	if( (LL_CORNER_MIN <= (S32)mManipPart) 
+	else if( (LL_CORNER_MIN <= (S32)mManipPart)
 		&& ((S32)mManipPart <= LL_CORNER_MAX) )
 	{
 		dragCorner( x, y );
 	}
-	
+
 	// store changes to override updates
 	for (LLObjectSelection::iterator iter = LLSelectMgr::getInstance()->getSelection()->begin();
 		 iter != LLSelectMgr::getInstance()->getSelection()->end(); iter++)
@@ -834,139 +835,110 @@ void LLManipScale::drag( S32 x, S32 y )
 			selectNode->mLastScale = cur->getScale();
 			selectNode->mLastPositionLocal = cur->getPosition();
 		}
-	}	
+	}
 
 	LLSelectMgr::getInstance()->updateSelectionCenter();
-    gAgentCamera.clearFocusObject();
+	gAgentCamera.clearFocusObject();
 }
 
-// Scale around the 
+// Scale on three axis simultaneously
 void LLManipScale::dragCorner( S32 x, S32 y )
 {
-	LLBBox bbox	= LLSelectMgr::getInstance()->getBBoxOfSelection();
-
 	// Suppress scale if mouse hasn't moved.
 	if (x == mLastMouseX && y == mLastMouseY)
 	{
-	//	sendUpdates(TRUE,TRUE,TRUE);
 		return;
 	}
 
 	mLastMouseX = x;
 	mLastMouseY = y;
 
-	LLVector3d drag_start_point_global	= mDragStartPointGlobal;
-	LLVector3d drag_start_center_global = mDragStartCenterGlobal;
-	LLVector3 drag_start_point_agent = gAgent.getPosAgentFromGlobal(drag_start_point_global);
-	LLVector3 drag_start_center_agent = gAgent.getPosAgentFromGlobal(drag_start_center_global);
+	LLVector3 drag_start_point_agent = gAgent.getPosAgentFromGlobal(mDragStartPointGlobal);
+	LLVector3 drag_start_center_agent = gAgent.getPosAgentFromGlobal(mDragStartCenterGlobal);
 
 	LLVector3d drag_start_dir_d;
-	drag_start_dir_d.setVec(drag_start_point_global - drag_start_center_global);
-	LLVector3 drag_start_dir_f;
-	drag_start_dir_f.setVec(drag_start_dir_d);
+	drag_start_dir_d.set(mDragStartPointGlobal - mDragStartCenterGlobal);
 
 	F32 s = 0;
 	F32 t = 0;
 
-	nearestPointOnLineFromMouse(x, y, 
-						drag_start_center_agent,
-						drag_start_point_agent,
-						s, t );
-
-	F32 drag_start_dist = dist_vec(drag_start_point_agent, drag_start_center_agent);
+	nearestPointOnLineFromMouse(x, y,
+								drag_start_center_agent,
+								drag_start_point_agent,
+								s, t );
 
 	if( s <= 0 )  // we only care about intersections in front of the camera
 	{
 		return;
 	}
+	mDragPointGlobal = lerp(mDragStartCenterGlobal, mDragStartPointGlobal, t);
 
-	LLVector3d drag_point_global = drag_start_center_global + t * drag_start_dir_d;
-
-	F32 scale_factor = t;
-
-	BOOL uniform = LLManipScale::getUniform();
-
-	if( !uniform )
-	{
-		scale_factor = 0.5f + (scale_factor * 0.5f);
-	}
+	LLBBox bbox	     = LLSelectMgr::getInstance()->getBBoxOfSelection();
+	F32 scale_factor = 1.f;
+	F32 max_scale    = partToMaxScale(mManipPart, bbox);
+	F32 min_scale    = partToMinScale(mManipPart, bbox);
+	BOOL uniform     = LLManipScale::getUniform();
 
 	// check for snapping
-	LLVector3 drag_center_agent = gAgent.getPosAgentFromGlobal(drag_point_global);
 	LLVector3 mouse_on_plane1;
-	getMousePointOnPlaneAgent(mouse_on_plane1, x, y, drag_center_agent, mScalePlaneNormal1);
-	LLVector3 mouse_on_plane2;
-	getMousePointOnPlaneAgent(mouse_on_plane2, x, y, drag_center_agent, mScalePlaneNormal2);
-	LLVector3 mouse_dir_1 = mouse_on_plane1 - mScaleCenter;
-	LLVector3 mouse_dir_2 = mouse_on_plane2 - mScaleCenter;
-	LLVector3 mouse_to_scale_line_1 = mouse_dir_1 - projected_vec(mouse_dir_1, mScaleDir);
-	LLVector3 mouse_to_scale_line_2 = mouse_dir_2 - projected_vec(mouse_dir_2, mScaleDir);
-	LLVector3 mouse_to_scale_line_dir_1 = mouse_to_scale_line_1;
-	mouse_to_scale_line_dir_1.normVec();
-	if (mouse_to_scale_line_dir_1 * mSnapGuideDir1 < 0.f)
-	{
-		// need to keep sign of mouse offset wrt to snap guide direction
-		mouse_to_scale_line_dir_1 *= -1.f;
-	}
-	LLVector3 mouse_to_scale_line_dir_2 = mouse_to_scale_line_2;
-	mouse_to_scale_line_dir_2.normVec();
-	if (mouse_to_scale_line_dir_2 * mSnapGuideDir2 < 0.f)
-	{
-		// need to keep sign of mouse offset wrt to snap guide direction
-		mouse_to_scale_line_dir_2 *= -1.f;
-	}
-
-	F32 snap_dir_dot_mouse_offset1 = mSnapGuideDir1 * mouse_to_scale_line_dir_1;
-	F32 snap_dir_dot_mouse_offset2 = mSnapGuideDir2 * mouse_to_scale_line_dir_2;
+	getMousePointOnPlaneAgent(mouse_on_plane1, x, y, mScaleCenter, mScalePlaneNormal1);
+	mouse_on_plane1 -= mScaleCenter;
 
-	F32 dist_from_scale_line_1 = mouse_to_scale_line_1 * mouse_to_scale_line_dir_1; 
-	F32 dist_from_scale_line_2 = mouse_to_scale_line_2 * mouse_to_scale_line_dir_2;
+	LLVector3 mouse_on_plane2;
+	getMousePointOnPlaneAgent(mouse_on_plane2, x, y, mScaleCenter, mScalePlaneNormal2);
+	mouse_on_plane2 -= mScaleCenter;
 
-	F32 max_scale = partToMaxScale(mManipPart, bbox);
-	F32 min_scale = partToMinScale(mManipPart, bbox);
+	LLVector3 projected_drag_pos1 = inverse_projected_vec(mScaleDir, orthogonal_component(mouse_on_plane1, mSnapGuideDir1));
+	LLVector3 projected_drag_pos2 = inverse_projected_vec(mScaleDir, orthogonal_component(mouse_on_plane2, mSnapGuideDir2));
 
 	BOOL snap_enabled = gSavedSettings.getBOOL("SnapEnabled");
-	if (snap_enabled && dist_from_scale_line_1 > mSnapRegimeOffset * snap_dir_dot_mouse_offset1)
+	if (snap_enabled && (mouse_on_plane1 - projected_drag_pos1) * mSnapGuideDir1 > mSnapRegimeOffset)
 	{
-		mInSnapRegime = TRUE;
-		LLVector3 projected_drag_pos = mouse_on_plane1 - (dist_from_scale_line_1 / snap_dir_dot_mouse_offset1) * mSnapGuideDir1;
-		F32 drag_dist = (projected_drag_pos - mScaleCenter) * mScaleDir;
+		F32 drag_dist = mScaleDir * projected_drag_pos1; // Projecting the drag position allows for negative results, vs using the length which will result in a "reverse scaling" bug.
 
-		F32 cur_subdivisions = llclamp(getSubdivisionLevel(projected_drag_pos, mScaleDir, mScaleSnapUnit1), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
+		F32 cur_subdivisions = llclamp(getSubdivisionLevel(mScaleCenter + projected_drag_pos1, mScaleDir, mScaleSnapUnit1, mTickPixelSpacing1), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
 		F32 snap_dist = mScaleSnapUnit1 / (2.f * cur_subdivisions);
 		F32 relative_snap_dist = fmodf(drag_dist + snap_dist, mScaleSnapUnit1 / cur_subdivisions);
 
-		mScaleSnapValue = llclamp((drag_dist - (relative_snap_dist - snap_dist)), min_scale, max_scale);
+		mScaleSnappedValue = llclamp((drag_dist - (relative_snap_dist - snap_dist)), min_scale, max_scale);
+		scale_factor  =  mScaleSnappedValue / dist_vec(drag_start_point_agent, drag_start_center_agent);
+		mScaleSnappedValue /= mScaleSnapUnit1 * 2.f;
+		mSnapRegime = SNAP_REGIME_UPPER;
 
-		scale_factor = mScaleSnapValue / drag_start_dist;
-		if( !uniform )
+		if (!uniform)
 		{
 			scale_factor *= 0.5f;
 		}
 	}
-	else if (snap_enabled && dist_from_scale_line_2 > mSnapRegimeOffset * snap_dir_dot_mouse_offset2)
+	else if (snap_enabled && (mouse_on_plane2 - projected_drag_pos2) * mSnapGuideDir2 > mSnapRegimeOffset )
 	{
-		mInSnapRegime = TRUE;
-		LLVector3 projected_drag_pos = mouse_on_plane2 - (dist_from_scale_line_2 / snap_dir_dot_mouse_offset2) * mSnapGuideDir2;
-		F32 drag_dist = (projected_drag_pos - mScaleCenter) * mScaleDir;
+		F32 drag_dist = mScaleDir * projected_drag_pos2; // Projecting the drag position allows for negative results, vs using the length which will result in a "reverse scaling" bug.
 
-		F32 cur_subdivisions = llclamp(getSubdivisionLevel(projected_drag_pos, mScaleDir, mScaleSnapUnit2), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
+		F32 cur_subdivisions = llclamp(getSubdivisionLevel(mScaleCenter + projected_drag_pos2, mScaleDir, mScaleSnapUnit2, mTickPixelSpacing2), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
 		F32 snap_dist = mScaleSnapUnit2 / (2.f * cur_subdivisions);
 		F32 relative_snap_dist = fmodf(drag_dist + snap_dist, mScaleSnapUnit2 / cur_subdivisions);
 
-		mScaleSnapValue = llclamp((drag_dist - (relative_snap_dist - snap_dist)), min_scale, max_scale);
+		mScaleSnappedValue = llclamp((drag_dist - (relative_snap_dist - snap_dist)), min_scale, max_scale);
+		scale_factor = mScaleSnappedValue / dist_vec(drag_start_point_agent, drag_start_center_agent);
+		mScaleSnappedValue /= mScaleSnapUnit2 * 2.f;
+		mSnapRegime = SNAP_REGIME_LOWER;
 
-		scale_factor = mScaleSnapValue / drag_start_dist;
-		if( !uniform )
+		if (!uniform)
 		{
 			scale_factor *= 0.5f;
 		}
 	}
-	else 
+	else
 	{
-		mInSnapRegime = FALSE;
+		mSnapRegime = SNAP_REGIME_NONE;
+		scale_factor = t;
+		if (!uniform)
+		{
+			scale_factor = 0.5f + (scale_factor * 0.5f);
+		}
 	}
 
+
 	F32 max_scale_factor = get_default_max_prim_scale() / MIN_PRIM_SCALE;
 	F32 min_scale_factor = MIN_PRIM_SCALE / get_default_max_prim_scale();
 
@@ -1008,7 +980,7 @@ void LLManipScale::dragCorner( S32 x, S32 y )
 		{
 			const LLVector3& scale = selectNode->mSavedScale;
 			cur->setScale( scale_factor * scale );
-			
+
 			LLVector3 delta_pos;
 			LLVector3 original_pos = cur->getPositionEdit();
 			LLVector3d new_pos_global = drag_global + (selectNode->mSavedPositionGlobal - drag_global) * scale_factor;
@@ -1018,7 +990,7 @@ void LLManipScale::dragCorner( S32 x, S32 y )
 			}
 			cur->setPositionAbsoluteGlobal( new_pos_global );
 			rebuild(cur);
-			
+
 			delta_pos = cur->getPositionEdit() - original_pos;
 
 			if (selectNode->mIndividualSelection)
@@ -1059,7 +1031,7 @@ void LLManipScale::dragCorner( S32 x, S32 y )
 		{
 			const LLVector3& scale = selectNode->mSavedScale;
 			cur->setScale( scale_factor * scale, FALSE );
-							
+
 			if (!selectNode->mIndividualSelection)
 			{
 				cur->setPosition(selectNode->mSavedPositionLocal * scale_factor);
@@ -1068,19 +1040,14 @@ void LLManipScale::dragCorner( S32 x, S32 y )
 			rebuild(cur);
 		}
 	}
-
-	
-
-	mDragPointGlobal = drag_point_global;
 }
 
-	
+// Scale on a single axis
 void LLManipScale::dragFace( S32 x, S32 y )
 {
 	// Suppress scale if mouse hasn't moved.
 	if (x == mLastMouseX && y == mLastMouseY)
 	{
-	//	sendUpdates(TRUE,TRUE,FALSE);
 		return;
 	}
 
@@ -1093,9 +1060,9 @@ void LLManipScale::dragFace( S32 x, S32 y )
 	LLVector3 drag_start_center_agent = gAgent.getPosAgentFromGlobal(drag_start_center_global);
 
 	LLVector3d drag_start_dir_d;
-	drag_start_dir_d.setVec(drag_start_point_global - drag_start_center_global);
+	drag_start_dir_d.set(drag_start_point_global - drag_start_center_global);
 	LLVector3 drag_start_dir_f;
-	drag_start_dir_f.setVec(drag_start_dir_d);
+	drag_start_dir_f.set(drag_start_dir_d);
 
 	LLBBox bbox	= LLSelectMgr::getInstance()->getBBoxOfSelection();
 
@@ -1139,26 +1106,26 @@ void LLManipScale::dragFace( S32 x, S32 y )
 
 	if (snap_enabled && dist_from_scale_line > mSnapRegimeOffset)
 	{
-		mInSnapRegime = TRUE;
+		mSnapRegime = static_cast<ESnapRegimes>(SNAP_REGIME_UPPER | SNAP_REGIME_LOWER); // A face drag doesn't have split regimes.
 
- 		if (dist_along_scale_line > max_drag_dist)
+		if (dist_along_scale_line > max_drag_dist)
 		{
-			mScaleSnapValue = max_drag_dist;
+			mScaleSnappedValue = max_drag_dist;
 
 			LLVector3 clamp_point = mScaleCenter + max_drag_dist * mScaleDir;
-			drag_delta.setVec(clamp_point - drag_start_point_agent);
+			drag_delta.set(clamp_point - drag_start_point_agent);
 		}
 		else if (dist_along_scale_line < min_drag_dist)
 		{
-			mScaleSnapValue = min_drag_dist;
+			mScaleSnappedValue = min_drag_dist;
 
 			LLVector3 clamp_point = mScaleCenter + min_drag_dist * mScaleDir;
-			drag_delta.setVec(clamp_point - drag_start_point_agent);
+			drag_delta.set(clamp_point - drag_start_point_agent);
 		}
 		else
 		{
 			F32 drag_dist = scale_center_to_mouse * mScaleDir;
-			F32 cur_subdivisions = llclamp(getSubdivisionLevel(mScaleCenter + mScaleDir * drag_dist, mScaleDir, mScaleSnapUnit1), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
+			F32 cur_subdivisions = llclamp(getSubdivisionLevel(mScaleCenter + mScaleDir * drag_dist, mScaleDir, mScaleSnapUnit1, mTickPixelSpacing1), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
 			F32 snap_dist = mScaleSnapUnit1 / (2.f * cur_subdivisions);
 			F32 relative_snap_dist = fmodf(drag_dist + snap_dist, mScaleSnapUnit1 / cur_subdivisions);
 			relative_snap_dist -= snap_dist;
@@ -1172,7 +1139,7 @@ void LLManipScale::dragFace( S32 x, S32 y )
 										 drag_dist - max_drag_dist,
 										 drag_dist - min_drag_dist);
 
-			mScaleSnapValue = drag_dist - relative_snap_dist;
+			mScaleSnappedValue = (drag_dist - relative_snap_dist) / (mScaleSnapUnit1 * 2.f);
 
 			if (llabs(relative_snap_dist) < snap_dist)
 			{
@@ -1186,9 +1153,9 @@ void LLManipScale::dragFace( S32 x, S32 y )
 			}
 		}
 	}
-	else 
+	else
 	{
-		mInSnapRegime = FALSE;
+		mSnapRegime = SNAP_REGIME_NONE;
 	}
 
 	LLVector3 dir_agent;
@@ -1204,7 +1171,7 @@ void LLManipScale::dragFace( S32 x, S32 y )
 	{
 		dir_agent = bbox.localToAgentBasis( LLVector3::z_axis );
 	}
-	stretchFace( 
+	stretchFace(
 		projected_vec(drag_start_dir_f, dir_agent) + drag_start_center_agent,
 		projected_vec(drag_delta, dir_agent));
 
@@ -1223,7 +1190,7 @@ void LLManipScale::sendUpdates( BOOL send_position_update, BOOL send_scale_updat
 		U32 update_flags = UPD_NONE;
 		if (send_position_update)	update_flags |= UPD_POSITION;
 		if (send_scale_update)		update_flags |= UPD_SCALE;
-		
+
 // 		BOOL send_type = SEND_INDIVIDUALS;
 		if (corner)
 		{
@@ -1271,7 +1238,7 @@ void LLManipScale::stretchFace( const LLVector3& drag_start_agent, const LLVecto
 			S32 axis_index			= axis.mV[0] ? 0 : (axis.mV[1] ? 1 : 2 );
 
 			LLVector3 delta_local	= end_local - start_local;
-			F32 delta_local_mag		= delta_local.magVec();
+			F32 delta_local_mag		= delta_local.length();
 			LLVector3 dir_local;
 			if (delta_local_mag == 0.f)
 			{
@@ -1291,13 +1258,13 @@ void LLManipScale::stretchFace( const LLVector3& drag_start_agent, const LLVecto
 			LLVector3 scale			= cur->getScale();
 			scale.mV[axis_index]	= desired_scale;
 			cur->setScale(scale, FALSE);
-			rebuild(cur);				
+			rebuild(cur);
 			LLVector3 delta_pos;
 			if( !getUniform() )
 			{
 				LLVector3 delta_pos_local = axis * (0.5f * desired_delta_size);
 				LLVector3d delta_pos_global;
-				delta_pos_global.setVec(cur_bbox.localToAgent( delta_pos_local ) - cur_bbox.getCenterAgent());
+				delta_pos_global.set(cur_bbox.localToAgent( delta_pos_local ) - cur_bbox.getCenterAgent());
 				LLVector3 cur_pos = cur->getPositionEdit();
 
 				if (cur->isRootEdit() && !cur->isAttachment())
@@ -1346,7 +1313,7 @@ void LLManipScale::stretchFace( const LLVector3& drag_start_agent, const LLVecto
 void LLManipScale::renderGuidelinesPart( const LLBBox& bbox )
 {
 	LLVector3 guideline_start = bbox.getCenterLocal();
-	
+
 	LLVector3 guideline_end = unitVectorToLocalBBoxExtent( partToUnitVector( mManipPart ), bbox );
 
 	if (!getUniform())
@@ -1355,7 +1322,7 @@ void LLManipScale::renderGuidelinesPart( const LLBBox& bbox )
 	}
 
 	guideline_end -= guideline_start;
-	guideline_end.normVec();
+	guideline_end.normalize();
 	guideline_end *= LLWorld::getInstance()->getRegionWidthInMeters();
 	guideline_end += guideline_start;
 
@@ -1376,26 +1343,27 @@ void LLManipScale::updateSnapGuides(const LLBBox& bbox)
 	LLQuaternion grid_rotation;
 	LLSelectMgr::getInstance()->getGrid(grid_origin, grid_rotation, grid_scale);
 
+	bool uniform = LLManipScale::getUniform();
+
 	LLVector3 box_corner_agent = bbox.localToAgent(unitVectorToLocalBBoxExtent( partToUnitVector( mManipPart ), bbox ));
-	mScaleCenter = getUniform() ? bbox.getCenterAgent() : bbox.localToAgent(unitVectorToLocalBBoxExtent( -1.f * partToUnitVector( mManipPart ), bbox ));
+	mScaleCenter = uniform ? bbox.getCenterAgent() : bbox.localToAgent(unitVectorToLocalBBoxExtent( -1.f * partToUnitVector( mManipPart ), bbox ));
 	mScaleDir = box_corner_agent - mScaleCenter;
-	mScaleDir.normVec();
+	mScaleDir.normalize();
 
 	if(mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
 	{
 		mSnapRegimeOffset = SNAP_GUIDE_SCREEN_OFFSET / gAgentCamera.mHUDCurZoom;
-
 	}
 	else
 	{
-		F32 object_distance = dist_vec(mScaleCenter, LLViewerCamera::getInstance()->getOrigin());
+		F32 object_distance = dist_vec(box_corner_agent, LLViewerCamera::getInstance()->getOrigin());
 		mSnapRegimeOffset = (SNAP_GUIDE_SCREEN_OFFSET * gViewerWindow->getWorldViewWidthRaw() * object_distance) / LLViewerCamera::getInstance()->getPixelMeterRatio();
 	}
 	LLVector3 cam_at_axis;
 	F32 snap_guide_length;
 	if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
 	{
-		cam_at_axis.setVec(1.f, 0.f, 0.f);
+		cam_at_axis.set(1.f, 0.f, 0.f);
 		snap_guide_length = SNAP_GUIDE_SCREEN_LENGTH / gAgentCamera.mHUDCurZoom;
 	}
 	else
@@ -1404,22 +1372,21 @@ void LLManipScale::updateSnapGuides(const LLBBox& bbox)
 		F32 manipulator_distance = dist_vec(box_corner_agent, LLViewerCamera::getInstance()->getOrigin());
 		snap_guide_length = (SNAP_GUIDE_SCREEN_LENGTH * gViewerWindow->getWorldViewWidthRaw() * manipulator_distance) / LLViewerCamera::getInstance()->getPixelMeterRatio();
 	}
-	
+
 	mSnapGuideLength = snap_guide_length / llmax(0.1f, (llmin(mSnapGuideDir1 * cam_at_axis, mSnapGuideDir2 * cam_at_axis)));
 
 	LLVector3 off_axis_dir = mScaleDir % cam_at_axis;
-	off_axis_dir.normVec();
+	off_axis_dir.normalize();
 
 	if( (LL_FACE_MIN <= (S32)mManipPart) && ((S32)mManipPart <= LL_FACE_MAX) )
 	{
-		LLVector3 object_scale = bbox.getMaxLocal();
-		object_scale.scaleVec(off_axis_dir * ~bbox.getRotation());
-		object_scale.abs();
-		if (object_scale.mV[VX] > object_scale.mV[VY] && object_scale.mV[VX] > object_scale.mV[VZ])
+		LLVector3 bbox_relative_cam_dir = off_axis_dir * ~bbox.getRotation();
+		bbox_relative_cam_dir.abs();
+		if (bbox_relative_cam_dir.mV[VX] > bbox_relative_cam_dir.mV[VY] && bbox_relative_cam_dir.mV[VX] > bbox_relative_cam_dir.mV[VZ])
 		{
 			mSnapGuideDir1 = LLVector3::x_axis * bbox.getRotation();
 		}
-		else if (object_scale.mV[VY] > object_scale.mV[VZ])
+		else if (bbox_relative_cam_dir.mV[VY] > bbox_relative_cam_dir.mV[VZ])
 		{
 			mSnapGuideDir1 = LLVector3::y_axis * bbox.getRotation();
 		}
@@ -1429,7 +1396,7 @@ void LLManipScale::updateSnapGuides(const LLBBox& bbox)
 		}
 
 		LLVector3 scale_snap = grid_scale;
-		mScaleSnapUnit1 = scale_snap.scaleVec(partToUnitVector( mManipPart )).magVec();
+		mScaleSnapUnit1 = scale_snap.scaleVec(partToUnitVector( mManipPart )).length();
 		mScaleSnapUnit2 = mScaleSnapUnit1;
 		mSnapGuideDir1 *= mSnapGuideDir1 * LLViewerCamera::getInstance()->getUpAxis() > 0.f ? 1.f : -1.f;
 		mSnapGuideDir2 = mSnapGuideDir1 * -1.f;
@@ -1438,7 +1405,6 @@ void LLManipScale::updateSnapGuides(const LLBBox& bbox)
 	}
 	else if( (LL_CORNER_MIN <= (S32)mManipPart) && ((S32)mManipPart <= LL_CORNER_MAX) )
 	{
-		LLVector3 local_scale_dir = partToUnitVector( mManipPart );
 		LLVector3 local_camera_dir;
 		if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
 		{
@@ -1446,74 +1412,133 @@ void LLManipScale::updateSnapGuides(const LLBBox& bbox)
 		}
 		else
 		{
-			local_camera_dir = (LLViewerCamera::getInstance()->getOrigin() - bbox.getCenterAgent()) * ~bbox.getRotation();
-			local_camera_dir.normVec();
-		}
-		local_scale_dir -= projected_vec(local_scale_dir, local_camera_dir);
-		local_scale_dir.normVec();
-		LLVector3 x_axis_proj_camera = LLVector3::x_axis - projected_vec(LLVector3::x_axis, local_camera_dir);
-		x_axis_proj_camera.normVec();
-		LLVector3 y_axis_proj_camera = LLVector3::y_axis - projected_vec(LLVector3::y_axis, local_camera_dir);
-		y_axis_proj_camera.normVec();
-		LLVector3 z_axis_proj_camera = LLVector3::z_axis - projected_vec(LLVector3::z_axis, local_camera_dir);
-		z_axis_proj_camera.normVec();
-		F32 x_axis_proj = llabs(local_scale_dir * x_axis_proj_camera);
-		F32 y_axis_proj = llabs(local_scale_dir * y_axis_proj_camera);
-		F32 z_axis_proj = llabs(local_scale_dir * z_axis_proj_camera);
-
-		if (x_axis_proj > y_axis_proj && x_axis_proj > z_axis_proj)
-		{
-			mSnapGuideDir1 = LLVector3::y_axis;
-			mScaleSnapUnit2 = grid_scale.mV[VY];
-			mSnapGuideDir2 = LLVector3::z_axis;
-			mScaleSnapUnit1 = grid_scale.mV[VZ];
-		}
-		else if (y_axis_proj > z_axis_proj)
-		{
-			mSnapGuideDir1 = LLVector3::x_axis;
-			mScaleSnapUnit2 = grid_scale.mV[VX];
-			mSnapGuideDir2 = LLVector3::z_axis;
-			mScaleSnapUnit1 = grid_scale.mV[VZ];
-		}
-		else
-		{
-			mSnapGuideDir1 = LLVector3::x_axis;
-			mScaleSnapUnit2 = grid_scale.mV[VX];
-			mSnapGuideDir2 = LLVector3::y_axis;
-			mScaleSnapUnit1 = grid_scale.mV[VY];
+			local_camera_dir = (LLViewerCamera::getInstance()->getOrigin() - box_corner_agent) * ~bbox.getRotation();
+			local_camera_dir.normalize();
 		}
 
-		LLVector3 snap_guide_flip(1.f, 1.f, 1.f);
+		LLVector3 axis_flip;
 		switch (mManipPart)
 		{
 		case LL_CORNER_NNN:
+			axis_flip.set(1.f, 1.f, 1.f);
 			break;
 		case LL_CORNER_NNP:
-			snap_guide_flip.setVec(1.f, 1.f, -1.f);
+			axis_flip.set(1.f, 1.f, -1.f);
 			break;
 		case LL_CORNER_NPN:
-			snap_guide_flip.setVec(1.f, -1.f, 1.f);
+			axis_flip.set(1.f, -1.f, 1.f);
 			break;
 		case LL_CORNER_NPP:
-			snap_guide_flip.setVec(1.f, -1.f, -1.f);
+			axis_flip.set(1.f, -1.f, -1.f);
 			break;
 		case LL_CORNER_PNN:
-			snap_guide_flip.setVec(-1.f, 1.f, 1.f);
+			axis_flip.set(-1.f, 1.f, 1.f);
 			break;
 		case LL_CORNER_PNP:
-			snap_guide_flip.setVec(-1.f, 1.f, -1.f);
+			axis_flip.set(-1.f, 1.f, -1.f);
 			break;
 		case LL_CORNER_PPN:
-			snap_guide_flip.setVec(-1.f, -1.f, 1.f);
+			axis_flip.set(-1.f, -1.f, 1.f);
 			break;
 		case LL_CORNER_PPP:
-			snap_guide_flip.setVec(-1.f, -1.f, -1.f);
+			axis_flip.set(-1.f, -1.f, -1.f);
+			break;
+		default:
+			break;
+		}
+
+		// account for which side of the object the camera is located and negate appropriate axes
+		local_camera_dir.scaleVec(axis_flip);
+
+		// normalize to object scale
+		LLVector3 bbox_extent = bbox.getExtentLocal();
+		local_camera_dir.scaleVec(LLVector3(1.f / bbox_extent.mV[VX], 1.f / bbox_extent.mV[VY], 1.f / bbox_extent.mV[VZ]));
+
+		S32 scale_face = -1;
+
+		if ((local_camera_dir.mV[VX] > 0.f) == (local_camera_dir.mV[VY] > 0.f))
+		{
+			if ((local_camera_dir.mV[VZ] > 0.f) == (local_camera_dir.mV[VY] > 0.f))
+			{
+				LLVector3 local_camera_dir_abs = local_camera_dir;
+				local_camera_dir_abs.abs();
+				// all neighboring faces of bbox are pointing towards camera or away from camera
+				// use largest magnitude face for snap guides
+				if (local_camera_dir_abs.mV[VX] > local_camera_dir_abs.mV[VY])
+				{
+					if (local_camera_dir_abs.mV[VX] > local_camera_dir_abs.mV[VZ])
+					{
+						scale_face = VX;
+					}
+					else
+					{
+						scale_face = VZ;
+					}
+				}
+				else // y > x
+				{
+					if (local_camera_dir_abs.mV[VY] > local_camera_dir_abs.mV[VZ])
+					{
+						scale_face = VY;
+					}
+					else
+					{
+						scale_face = VZ;
+					}
+				}
+			}
+			else
+			{
+				// z axis facing opposite direction from x and y relative to camera, use x and y for snap guides
+				scale_face = VZ;
+			}
+		}
+		else // x and y axes are facing in opposite directions relative to camera
+		{
+			if ((local_camera_dir.mV[VZ] > 0.f) == (local_camera_dir.mV[VY] > 0.f))
+			{
+				// x axis facing opposite direction from y and z relative to camera, use y and z for snap guides
+				scale_face = VX;
+			}
+			else
+			{
+				// y axis facing opposite direction from x and z relative to camera, use x and z for snap guides
+				scale_face = VY;
+			}
+		}
+
+		switch(scale_face)
+		{
+		case VX:
+			// x axis face being scaled, use y and z for snap guides
+			mSnapGuideDir1 = LLVector3::y_axis.scaledVec(axis_flip);
+			mScaleSnapUnit1 = grid_scale.mV[VZ];
+			mSnapGuideDir2 = LLVector3::z_axis.scaledVec(axis_flip);
+			mScaleSnapUnit2 = grid_scale.mV[VY];
+			break;
+		case VY:
+			// y axis facing being scaled, use x and z for snap guides
+			mSnapGuideDir1 = LLVector3::x_axis.scaledVec(axis_flip);
+			mScaleSnapUnit1 = grid_scale.mV[VZ];
+			mSnapGuideDir2 = LLVector3::z_axis.scaledVec(axis_flip);
+			mScaleSnapUnit2 = grid_scale.mV[VX];
+			break;
+		case VZ:
+			// z axis facing being scaled, use x and y for snap guides
+			mSnapGuideDir1 = LLVector3::x_axis.scaledVec(axis_flip);
+			mScaleSnapUnit1 = grid_scale.mV[VY];
+			mSnapGuideDir2 = LLVector3::y_axis.scaledVec(axis_flip);
+			mScaleSnapUnit2 = grid_scale.mV[VX];
 			break;
 		default:
+			mSnapGuideDir1.setZero();
+			mScaleSnapUnit1 = 0.f;
+
+			mSnapGuideDir2.setZero();
+			mScaleSnapUnit2 = 0.f;
 			break;
 		}
-		mSnapGuideDir1.scaleVec(snap_guide_flip);
-		mSnapGuideDir2.scaleVec(snap_guide_flip);
+
 		mSnapGuideDir1.rotVec(bbox.getRotation());
 		mSnapGuideDir2.rotVec(bbox.getRotation());
 		mSnapDir1 = -1.f * mSnapGuideDir2;
@@ -1521,13 +1546,22 @@ void LLManipScale::updateSnapGuides(const LLBBox& bbox)
 	}
 
 	mScalePlaneNormal1 = mSnapGuideDir1 % mScaleDir;
-	mScalePlaneNormal1.normVec();
+	mScalePlaneNormal1.normalize();
 
 	mScalePlaneNormal2 = mSnapGuideDir2 % mScaleDir;
-	mScalePlaneNormal2.normVec();	
+	mScalePlaneNormal2.normalize();
 
 	mScaleSnapUnit1 = mScaleSnapUnit1 / (mSnapDir1 * mScaleDir);
 	mScaleSnapUnit2 = mScaleSnapUnit2 / (mSnapDir2 * mScaleDir);
+
+	mTickPixelSpacing1 = llround((F32)MIN_DIVISION_PIXEL_WIDTH / (mScaleDir % mSnapGuideDir1).length());
+	mTickPixelSpacing2 = llround((F32)MIN_DIVISION_PIXEL_WIDTH / (mScaleDir % mSnapGuideDir2).length());
+
+	if (uniform)
+	{
+		mScaleSnapUnit1 *= 0.5f;
+		mScaleSnapUnit2 *= 0.5f;
+	}
 }
 
 void LLManipScale::renderSnapGuides(const LLBBox& bbox)
@@ -1537,7 +1571,6 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 		return;
 	}
 
-	F32 max_subdivisions = sGridMaxSubdivisionLevel;
 	F32 grid_alpha = gSavedSettings.getF32("GridOpacity");
 
 	F32 max_point_on_scale_line = partToMaxScale(mManipPart, bbox);
@@ -1551,10 +1584,10 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 		LLColor4 tick_color = setupSnapGuideRenderPass(pass);
 
 		gGL.begin(LLRender::LINES);
-		LLVector3 line_mid = mScaleCenter + (mScaleSnapValue * mScaleDir) + (mSnapGuideDir1 * mSnapRegimeOffset);
-		LLVector3 line_start = line_mid - (mScaleDir * (llmin(mScaleSnapValue, mSnapGuideLength * 0.5f)));
-		LLVector3 line_end = line_mid + (mScaleDir * llmin(max_point_on_scale_line - mScaleSnapValue, mSnapGuideLength * 0.5f));
-		
+		LLVector3 line_mid = mScaleCenter + (mScaleSnappedValue * mScaleDir) + (mSnapGuideDir1 * mSnapRegimeOffset);
+		LLVector3 line_start = line_mid - (mScaleDir * (llmin(mScaleSnappedValue, mSnapGuideLength * 0.5f)));
+		LLVector3 line_end = line_mid + (mScaleDir * llmin(max_point_on_scale_line - mScaleSnappedValue, mSnapGuideLength * 0.5f));
+
 		gGL.color4f(tick_color.mV[VRED], tick_color.mV[VGREEN], tick_color.mV[VBLUE], tick_color.mV[VALPHA] * 0.1f);
 		gGL.vertex3fv(line_start.mV);
 		gGL.color4fv(tick_color.mV);
@@ -1563,9 +1596,9 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 		gGL.color4f(tick_color.mV[VRED], tick_color.mV[VGREEN], tick_color.mV[VBLUE], tick_color.mV[VALPHA] * 0.1f);
 		gGL.vertex3fv(line_end.mV);
 
-		line_mid = mScaleCenter + (mScaleSnapValue * mScaleDir) + (mSnapGuideDir2 * mSnapRegimeOffset);
-		line_start = line_mid - (mScaleDir * (llmin(mScaleSnapValue, mSnapGuideLength * 0.5f)));
-		line_end = line_mid + (mScaleDir * llmin(max_point_on_scale_line - mScaleSnapValue, mSnapGuideLength * 0.5f));
+		line_mid = mScaleCenter + (mScaleSnappedValue * mScaleDir) + (mSnapGuideDir2 * mSnapRegimeOffset);
+		line_start = line_mid - (mScaleDir * (llmin(mScaleSnappedValue, mSnapGuideLength * 0.5f)));
+		line_end = line_mid + (mScaleDir * llmin(max_point_on_scale_line - mScaleSnappedValue, mSnapGuideLength * 0.5f));
 		gGL.vertex3fv(line_start.mV);
 		gGL.color4fv(tick_color.mV);
 		gGL.vertex3fv(line_mid.mV);
@@ -1578,31 +1611,38 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 	{
 		LLGLDepthTest gls_depth(GL_FALSE);
 
-		F32 dist_grid_axis = (drag_point - mScaleCenter) * mScaleDir;
+		F32 dist_grid_axis = llmax(0.f, (drag_point - mScaleCenter) * mScaleDir);
+		
+		F32 smallest_subdivision1 = mScaleSnapUnit1 / sGridMaxSubdivisionLevel;
+		F32 smallest_subdivision2 = mScaleSnapUnit2 / sGridMaxSubdivisionLevel;
+		
+		F32 dist_scale_units_1 = dist_grid_axis / smallest_subdivision1;
+		F32 dist_scale_units_2 = dist_grid_axis / smallest_subdivision2;
+		
 		// find distance to nearest smallest grid unit
-		F32 grid_offset1 = fmodf(dist_grid_axis, mScaleSnapUnit1 / max_subdivisions);
-		F32 grid_offset2 = fmodf(dist_grid_axis, mScaleSnapUnit2 / max_subdivisions);
+		F32 grid_multiple1 = llfloor(dist_scale_units_1);
+		F32 grid_multiple2 = llfloor(dist_scale_units_2);
+		F32 grid_offset1 = fmodf(dist_grid_axis, smallest_subdivision1);
+		F32 grid_offset2 = fmodf(dist_grid_axis, smallest_subdivision2);
 
 		// how many smallest grid units are we away from largest grid scale?
-		S32 sub_div_offset_1 = llround(fmod(dist_grid_axis - grid_offset1, mScaleSnapUnit1 / sGridMinSubdivisionLevel) / (mScaleSnapUnit1 / max_subdivisions));
-		S32 sub_div_offset_2 = llround(fmod(dist_grid_axis - grid_offset2, mScaleSnapUnit2 / sGridMinSubdivisionLevel) / (mScaleSnapUnit2 / max_subdivisions));
+		S32 sub_div_offset_1 = llround(fmod(dist_grid_axis - grid_offset1, mScaleSnapUnit1 / sGridMinSubdivisionLevel) / smallest_subdivision1);
+		S32 sub_div_offset_2 = llround(fmod(dist_grid_axis - grid_offset2, mScaleSnapUnit2 / sGridMinSubdivisionLevel) / smallest_subdivision2);
 
-		S32 num_ticks_per_side1 = llmax(1, lltrunc(0.5f * mSnapGuideLength / (mScaleSnapUnit1 / max_subdivisions)));
-		S32 num_ticks_per_side2 = llmax(1, lltrunc(0.5f * mSnapGuideLength / (mScaleSnapUnit2 / max_subdivisions)));
-		F32 dist_scale_units_1 = dist_grid_axis / (mScaleSnapUnit1 / max_subdivisions);
-		F32 dist_scale_units_2 = dist_grid_axis / (mScaleSnapUnit2 / max_subdivisions);
+		S32 num_ticks_per_side1 = llmax(1, lltrunc(0.5f * mSnapGuideLength / smallest_subdivision1));
+		S32 num_ticks_per_side2 = llmax(1, lltrunc(0.5f * mSnapGuideLength / smallest_subdivision2));
 		S32 ticks_from_scale_center_1 = lltrunc(dist_scale_units_1);
 		S32 ticks_from_scale_center_2 = lltrunc(dist_scale_units_2);
-		S32 max_ticks1 = llceil(max_point_on_scale_line / (mScaleSnapUnit1 / max_subdivisions) - dist_scale_units_1);
-		S32 max_ticks2 = llceil(max_point_on_scale_line / (mScaleSnapUnit2 / max_subdivisions) - dist_scale_units_2);
+		S32 max_ticks1 = llceil(max_point_on_scale_line / smallest_subdivision1 - dist_scale_units_1);
+		S32 max_ticks2 = llceil(max_point_on_scale_line / smallest_subdivision2 - dist_scale_units_2);
 		S32 start_tick = 0;
 		S32 stop_tick = 0;
 
-		if (mInSnapRegime)
+		if (mSnapRegime != SNAP_REGIME_NONE)
 		{
 			// draw snap guide line
 			gGL.begin(LLRender::LINES);
-			LLVector3 snap_line_center = mScaleCenter + (mScaleSnapValue * mScaleDir);
+			LLVector3 snap_line_center = bbox.localToAgent(unitVectorToLocalBBoxExtent( partToUnitVector( mManipPart ), bbox ));
 
 			LLVector3 snap_line_start = snap_line_center + (mSnapGuideDir1 * mSnapRegimeOffset);
 			LLVector3 snap_line_end = snap_line_center + (mSnapGuideDir2 * mSnapRegimeOffset);
@@ -1624,22 +1664,22 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 				LLVector3 arrow_span = mScaleDir;
 
 				arrow_dir = snap_line_start - snap_line_center;
-				arrow_dir.normVec();
+				arrow_dir.normalize();
 				gGL.vertex3fv((snap_line_start + arrow_dir * mBoxHandleSize).mV);
 				gGL.vertex3fv((snap_line_start + arrow_span * mBoxHandleSize).mV);
 				gGL.vertex3fv((snap_line_start - arrow_span * mBoxHandleSize).mV);
 
 				arrow_dir = snap_line_end - snap_line_center;
-				arrow_dir.normVec();
+				arrow_dir.normalize();
 				gGL.vertex3fv((snap_line_end + arrow_dir * mBoxHandleSize).mV);
 				gGL.vertex3fv((snap_line_end + arrow_span * mBoxHandleSize).mV);
 				gGL.vertex3fv((snap_line_end - arrow_span * mBoxHandleSize).mV);
 			}
 			gGL.end();
 		}
-	
+
 		LLVector2 screen_translate_axis(llabs(mScaleDir * LLViewerCamera::getInstance()->getLeftAxis()), llabs(mScaleDir * LLViewerCamera::getInstance()->getUpAxis()));
-		screen_translate_axis.normVec();
+		screen_translate_axis.normalize();
 
 		S32 tick_label_spacing = llround(screen_translate_axis * sTickLabelSpacing);
 
@@ -1655,17 +1695,17 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 			for (S32 i = start_tick; i <= stop_tick; i++)
 			{
 				F32 alpha = (1.f - (1.f *  ((F32)llabs(i) / (F32)num_ticks_per_side1)));
-				LLVector3 tick_pos = drag_point + (mScaleDir * (mScaleSnapUnit1 / max_subdivisions * (F32)i - grid_offset1));
+				LLVector3 tick_pos = mScaleCenter + (mScaleDir * (grid_multiple1 + i) * smallest_subdivision1);
 
-				F32 cur_subdivisions = llclamp(getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit1), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
+				F32 cur_subdivisions = llclamp(getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit1, mTickPixelSpacing1), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
 
-				if (fmodf((F32)(i + sub_div_offset_1), (max_subdivisions / cur_subdivisions)) != 0.f)
+				if (fmodf((F32)(i + sub_div_offset_1), (sGridMaxSubdivisionLevel / cur_subdivisions)) != 0.f)
 				{
 					continue;
 				}
 
 				F32 tick_scale = 1.f;
-				for (F32 division_level = max_subdivisions; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
+				for (F32 division_level = sGridMaxSubdivisionLevel; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
 				{
 					if (fmodf((F32)(i + sub_div_offset_1), division_level) == 0.f)
 					{
@@ -1688,17 +1728,17 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 			for (S32 i = start_tick; i <= stop_tick; i++)
 			{
 				F32 alpha = (1.f - (1.f *  ((F32)llabs(i) / (F32)num_ticks_per_side2)));
-				LLVector3 tick_pos = drag_point + (mScaleDir * (mScaleSnapUnit2 / max_subdivisions * (F32)i - grid_offset2));
+				LLVector3 tick_pos = mScaleCenter + (mScaleDir * (grid_multiple2 + i) * smallest_subdivision2);
 
-				F32 cur_subdivisions = llclamp(getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit2), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
+				F32 cur_subdivisions = llclamp(getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit2, mTickPixelSpacing2), sGridMinSubdivisionLevel, sGridMaxSubdivisionLevel);
 
-				if (fmodf((F32)(i + sub_div_offset_2), (max_subdivisions / cur_subdivisions)) != 0.f)
+				if (fmodf((F32)(i + sub_div_offset_2), (sGridMaxSubdivisionLevel / cur_subdivisions)) != 0.f)
 				{
 					continue;
 				}
 
 				F32 tick_scale = 1.f;
-				for (F32 division_level = max_subdivisions; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
+				for (F32 division_level = sGridMaxSubdivisionLevel; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
 				{
 					if (fmodf((F32)(i + sub_div_offset_2), division_level) == 0.f)
 					{
@@ -1716,21 +1756,21 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 			gGL.end();
 		}
 
-		// render tick labels
+		// render upper tick labels
 		start_tick = -(llmin(ticks_from_scale_center_1, num_ticks_per_side1));
 		stop_tick = llmin(max_ticks1, num_ticks_per_side1);
 
 		F32 grid_resolution = mObjectSelection->getSelectType() == SELECT_TYPE_HUD ? 0.25f : llmax(gSavedSettings.getF32("GridResolution"), 0.001f);
-		S32 label_sub_div_offset_1 = llround(fmod(dist_grid_axis - grid_offset1, mScaleSnapUnit1  * 32.f) / (mScaleSnapUnit1 / max_subdivisions));
-		S32 label_sub_div_offset_2 = llround(fmod(dist_grid_axis - grid_offset2, mScaleSnapUnit2  * 32.f) / (mScaleSnapUnit2 / max_subdivisions));
+		S32 label_sub_div_offset_1 = llround(fmod(dist_grid_axis - grid_offset1, mScaleSnapUnit1  * 32.f) / smallest_subdivision1);
+		S32 label_sub_div_offset_2 = llround(fmod(dist_grid_axis - grid_offset2, mScaleSnapUnit2  * 32.f) / smallest_subdivision2);
 
 		for (S32 i = start_tick; i <= stop_tick; i++)
 		{
 			F32 tick_scale = 1.f;
 			F32 alpha = grid_alpha * (1.f - (0.5f *  ((F32)llabs(i) / (F32)num_ticks_per_side1)));
-			LLVector3 tick_pos = drag_point + (mScaleDir * (mScaleSnapUnit1 / max_subdivisions * (F32)i - grid_offset1));
+			LLVector3 tick_pos = mScaleCenter + (mScaleDir * (grid_multiple1 + i) * smallest_subdivision1);
 
-			for (F32 division_level = max_subdivisions; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
+			for (F32 division_level = sGridMaxSubdivisionLevel; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
 			{
 				if (fmodf((F32)(i + label_sub_div_offset_1), division_level) == 0.f)
 				{
@@ -1739,39 +1779,34 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 				tick_scale *= 0.7f;
 			}
 
-			if (fmodf((F32)(i + label_sub_div_offset_1), (max_subdivisions / llmin(sGridMaxSubdivisionLevel, getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit1, tick_label_spacing)))) == 0.f)
+			if (fmodf((F32)(i + label_sub_div_offset_1), (sGridMaxSubdivisionLevel / llmin(sGridMaxSubdivisionLevel, getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit1, tick_label_spacing)))) == 0.f)
 			{
-				LLVector3 text_origin = tick_pos + 
-					(mSnapGuideDir1 * mSnapRegimeOffset * (1.f + tick_scale));
+				LLVector3 text_origin = tick_pos + (mSnapGuideDir1 * mSnapRegimeOffset * (1.f + tick_scale));
 
 				EGridMode grid_mode = LLSelectMgr::getInstance()->getGridMode();
-				F32 tick_val;
+				F32 tick_value;
 				if (grid_mode == GRID_MODE_WORLD)
 				{
-					tick_val = (tick_pos - mScaleCenter) * mScaleDir / (mScaleSnapUnit1 / grid_resolution);
+					tick_value = (grid_multiple1 + i) / (sGridMaxSubdivisionLevel / grid_resolution);
 				}
 				else
 				{
-					tick_val = (tick_pos - mScaleCenter) * mScaleDir / (mScaleSnapUnit1 * 2.f);
-				}
-
-				if (getUniform())
-				{
-					tick_val *= 2.f;
+					tick_value = (grid_multiple1 + i) / (2.f * sGridMaxSubdivisionLevel);
 				}
 
 				F32 text_highlight = 0.8f;
 
-				if (is_approx_equal(tick_val, mScaleSnapValue) && mInSnapRegime)
+				// Highlight this text if the tick value matches the snapped to value, and if either the second set of ticks isn't going to be shown or cursor is in the first snap regime.
+				if (is_approx_equal(tick_value, mScaleSnappedValue) && (mScaleSnapUnit2 == mScaleSnapUnit1 || (mSnapRegime & SNAP_REGIME_UPPER)))
 				{
 					text_highlight = 1.f;
 				}
 
-				renderTickValue(text_origin, tick_val, grid_mode == GRID_MODE_WORLD ? std::string("m") : std::string("x"), LLColor4(text_highlight, text_highlight, text_highlight, alpha));
+				renderTickValue(text_origin, tick_value, grid_mode == GRID_MODE_WORLD ? std::string("m") : std::string("x"), LLColor4(text_highlight, text_highlight, text_highlight, alpha));
 			}
 		}
 
-		// label ticks on opposite side
+		// label ticks on opposite side, only can happen in scaling modes that effect more than one axis and when the object's axis don't have the same scale.  A differing scale indicates both conditions.
 		if (mScaleSnapUnit2 != mScaleSnapUnit1)
 		{
 			start_tick = -(llmin(ticks_from_scale_center_2, num_ticks_per_side2));
@@ -1780,9 +1815,9 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 			{
 				F32 tick_scale = 1.f;
 				F32 alpha = grid_alpha * (1.f - (0.5f *  ((F32)llabs(i) / (F32)num_ticks_per_side2)));
-				LLVector3 tick_pos = drag_point + (mScaleDir * (mScaleSnapUnit2 / max_subdivisions * (F32)i - grid_offset2));
+				LLVector3 tick_pos = mScaleCenter + (mScaleDir * (grid_multiple2 + i) * smallest_subdivision2);
 
-				for (F32 division_level = max_subdivisions; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
+				for (F32 division_level = sGridMaxSubdivisionLevel; division_level >= sGridMinSubdivisionLevel; division_level /= 2.f)
 				{
 					if (fmodf((F32)(i + label_sub_div_offset_2), division_level) == 0.f)
 					{
@@ -1791,35 +1826,29 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 					tick_scale *= 0.7f;
 				}
 
-				if (fmodf((F32)(i + label_sub_div_offset_2), (max_subdivisions / llmin(max_subdivisions, getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit2, tick_label_spacing)))) == 0.f)
+				if (fmodf((F32)(i + label_sub_div_offset_2), (sGridMaxSubdivisionLevel / llmin(sGridMaxSubdivisionLevel, getSubdivisionLevel(tick_pos, mScaleDir, mScaleSnapUnit2, tick_label_spacing)))) == 0.f)
 				{
-					LLVector3 text_origin = tick_pos + 
-						(mSnapGuideDir2 * mSnapRegimeOffset * (1.f + tick_scale));
+					LLVector3 text_origin = tick_pos + (mSnapGuideDir2 * mSnapRegimeOffset * (1.f + tick_scale));
 
 					EGridMode grid_mode = LLSelectMgr::getInstance()->getGridMode();
-					F32 tick_val;
+					F32 tick_value;
 					if (grid_mode == GRID_MODE_WORLD)
 					{
-						tick_val = (tick_pos - mScaleCenter) * mScaleDir / (mScaleSnapUnit2 / grid_resolution);
+						tick_value = (grid_multiple2 + i) / (sGridMaxSubdivisionLevel / grid_resolution);
 					}
 					else
 					{
-						tick_val = (tick_pos - mScaleCenter) * mScaleDir / (mScaleSnapUnit2 * 2.f);
-					}
-
-					if (getUniform())
-					{
-						tick_val *= 2.f;
+						tick_value = (grid_multiple2 + i) / (2.f * sGridMaxSubdivisionLevel);
 					}
 
 					F32 text_highlight = 0.8f;
 
-					if (is_approx_equal(tick_val, mScaleSnapValue) && mInSnapRegime)
+					if (is_approx_equal(tick_value, mScaleSnappedValue) && (mSnapRegime & SNAP_REGIME_LOWER))
 					{
 						text_highlight = 1.f;
 					}
 
-					renderTickValue(text_origin, tick_val, grid_mode == GRID_MODE_WORLD ? std::string("m") : std::string("x"), LLColor4(text_highlight, text_highlight, text_highlight, alpha));
+					renderTickValue(text_origin, tick_value, grid_mode == GRID_MODE_WORLD ? std::string("m") : std::string("x"), LLColor4(text_highlight, text_highlight, text_highlight, alpha));
 				}
 			}
 		}
@@ -1845,13 +1874,13 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 				LLVector3 help_text_pos = selection_center_start + (mSnapRegimeOffset * 5.f * offset_dir);
 				const LLFontGL* big_fontp = LLFontGL::getFontSansSerif();
 
-				std::string help_text = "Move mouse cursor over ruler";
+				std::string help_text = LLTrans::getString("manip_hint1");
 				LLColor4 help_text_color = LLColor4::white;
 				help_text_color.mV[VALPHA] = clamp_rescale(mHelpTextTimer.getElapsedTimeF32(), sHelpTextVisibleTime, sHelpTextVisibleTime + sHelpTextFadeTime, grid_alpha, 0.f);
-				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, mObjectSelection->getSelectType() == SELECT_TYPE_HUD);
-				help_text = "to snap to grid";
+				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, false);
+				help_text = LLTrans::getString("manip_hint2");
 				help_text_pos -= LLViewerCamera::getInstance()->getUpAxis() * mSnapRegimeOffset * 0.4f;
-				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, mObjectSelection->getSelectType() == SELECT_TYPE_HUD);
+				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, false);
 			}
 		}
 	}
@@ -1860,17 +1889,15 @@ void LLManipScale::renderSnapGuides(const LLBBox& bbox)
 // Returns unit vector in direction of part of an origin-centered cube
 LLVector3 LLManipScale::partToUnitVector( S32 part ) const
 {
-	if( (LL_FACE_MIN <= part) && (part <= LL_FACE_MAX) )
+	if ( (LL_FACE_MIN <= part) && (part <= LL_FACE_MAX) )
 	{
 		return faceToUnitVector( part );
 	}
-	else
-	if( (LL_CORNER_MIN <= part) && (part <= LL_CORNER_MAX) )
+	else if ( (LL_CORNER_MIN <= part) && (part <= LL_CORNER_MAX) )
 	{
 		return cornerToUnitVector( part );
 	}
-	else
-	if( (LL_EDGE_MIN <= part) && (part <= LL_EDGE_MAX ) )
+	else if ( (LL_EDGE_MIN <= part) && (part <= LL_EDGE_MAX ) )
 	{
 		return edgeToUnitVector( part );
 	}
@@ -1882,27 +1909,32 @@ LLVector3 LLManipScale::partToUnitVector( S32 part ) const
 LLVector3 LLManipScale::faceToUnitVector( S32 part ) const
 {
 	llassert( (LL_FACE_MIN <= part) && (part <= LL_FACE_MAX) );
+	LLVector3 vec;
 	switch( part )
 	{
 		case LL_FACE_POSX:
-			return LLVector3(  1.f,  0.f,  0.f );
-
+			vec.set(  1.f,  0.f,  0.f );
+			break;
 		case LL_FACE_NEGX:
-			return LLVector3( -1.f,  0.f,  0.f );
-
+			vec.set( -1.f,  0.f,  0.f );
+			break;
 		case LL_FACE_POSY:
-			return LLVector3(  0.f,  1.f,  0.f );
-
+			vec.set(  0.f,  1.f,  0.f );
+			break;
 		case LL_FACE_NEGY:
-			return LLVector3(  0.f, -1.f,  0.f );
-
+			vec.set(  0.f, -1.f,  0.f );
+			break;
 		case LL_FACE_POSZ:
-			return LLVector3(  0.f,  0.f,  1.f );
-
+			vec.set(  0.f,  0.f,  1.f );
+			break;
 		case LL_FACE_NEGZ:
-			return LLVector3(  0.f,  0.f, -1.f );
+			vec.set(  0.f,  0.f, -1.f );
+			break;
+		default:
+			vec.clear();
 	}
-	return LLVector3();
+
+	return vec;
 }
 
 
@@ -1914,31 +1946,31 @@ LLVector3 LLManipScale::cornerToUnitVector( S32 part ) const
 	switch(part)
 	{
 		case LL_CORNER_NNN:
-			vec.setVec(-F_SQRT3, -F_SQRT3, -F_SQRT3);
+			vec.set(-OO_SQRT3, -OO_SQRT3, -OO_SQRT3);
 			break;
-		case LL_CORNER_NNP:		
-			vec.setVec(-F_SQRT3, -F_SQRT3, F_SQRT3);
+		case LL_CORNER_NNP:
+			vec.set(-OO_SQRT3, -OO_SQRT3, OO_SQRT3);
 			break;
 		case LL_CORNER_NPN:
-			vec.setVec(-F_SQRT3, F_SQRT3, -F_SQRT3);
+			vec.set(-OO_SQRT3, OO_SQRT3, -OO_SQRT3);
 			break;
 		case LL_CORNER_NPP:
-			vec.setVec(-F_SQRT3, F_SQRT3, F_SQRT3);
+			vec.set(-OO_SQRT3, OO_SQRT3, OO_SQRT3);
 			break;
 		case LL_CORNER_PNN:
-			vec.setVec(F_SQRT3, -F_SQRT3, -F_SQRT3);
+			vec.set(OO_SQRT3, -OO_SQRT3, -OO_SQRT3);
 			break;
 		case LL_CORNER_PNP:
-			vec.setVec(F_SQRT3, -F_SQRT3, F_SQRT3);
+			vec.set(OO_SQRT3, -OO_SQRT3, OO_SQRT3);
 			break;
 		case LL_CORNER_PPN:
-			vec.setVec(F_SQRT3, F_SQRT3, -F_SQRT3);
+			vec.set(OO_SQRT3, OO_SQRT3, -OO_SQRT3);
 			break;
 		case LL_CORNER_PPP:
-			vec.setVec(F_SQRT3, F_SQRT3, F_SQRT3);
+			vec.set(OO_SQRT3, OO_SQRT3, OO_SQRT3);
 			break;
 		default:
-			vec.clearVec();
+			vec.clear();
 	}
 
 	return vec;
@@ -1965,8 +1997,8 @@ LLVector3 LLManipScale::unitVectorToLocalBBoxExtent( const LLVector3& v, const L
 	LLVector3 ctr = bbox.getCenterLocal();
 
 	return LLVector3(
-		v.mV[0] ? (v.mV[0]>0 ? max.mV[0] : min.mV[0] ) : ctr.mV[0], 
-		v.mV[1] ? (v.mV[1]>0 ? max.mV[1] : min.mV[1] ) : ctr.mV[1], 
+		v.mV[0] ? (v.mV[0]>0 ? max.mV[0] : min.mV[0] ) : ctr.mV[0],
+		v.mV[1] ? (v.mV[1]>0 ? max.mV[1] : min.mV[1] ) : ctr.mV[1],
 		v.mV[2] ? (v.mV[2]>0 ? max.mV[2] : min.mV[2] ) : ctr.mV[2] );
 }
 
@@ -1984,7 +2016,7 @@ F32		LLManipScale::partToMaxScale( S32 part, const LLBBox &bbox ) const
 			max_extent = bbox_extents.mV[i];
 		}
 	}
-	max_scale_factor = bbox_extents.magVec() * get_default_max_prim_scale() / max_extent;
+	max_scale_factor = bbox_extents.length() * get_default_max_prim_scale() / max_extent;
 
 	if (getUniform())
 	{
@@ -2007,7 +2039,7 @@ F32		LLManipScale::partToMinScale( S32 part, const LLBBox &bbox ) const
 			min_extent = bbox_extents.mV[i];
 		}
 	}
-	F32 min_scale_factor = bbox_extents.magVec() * MIN_PRIM_SCALE / min_extent;
+	F32 min_scale_factor = bbox_extents.length() * MIN_PRIM_SCALE / min_extent;
 
 	if (getUniform())
 	{
@@ -2058,7 +2090,7 @@ LLVector3 LLManipScale::nearestAxis( const LLVector3& v ) const
 // virtual
 BOOL LLManipScale::canAffectSelection()
 {
-	// An selection is scalable if you are allowed to both edit and move 
+	// An selection is scalable if you are allowed to both edit and move
 	// everything in it, and it does not have any sitting agents
 	BOOL can_scale = mObjectSelection->getObjectCount() != 0;
 	if (can_scale)
diff --git a/indra/newview/llmanipscale.h b/indra/newview/llmanipscale.h
index 5cb8898fd0..e1da7a1bb5 100755
--- a/indra/newview/llmanipscale.h
+++ b/indra/newview/llmanipscale.h
@@ -51,6 +51,13 @@ typedef	enum e_scale_manipulator_type
 	SCALE_MANIP_FACE
 } EScaleManipulatorType;
 
+typedef	enum e_snap_regimes
+{
+	SNAP_REGIME_NONE = 0, //!< The cursor is not in either of the snap regimes.
+	SNAP_REGIME_UPPER = 0x1, //!< The cursor is, non-exclusively, in the first of the snap regimes. Prefer to treat as bitmask.
+	SNAP_REGIME_LOWER = 0x2 //!< The cursor is, non-exclusively, in the second of the snap regimes. Prefer to treat as bitmask.
+} ESnapRegimes;
+
 
 class LLManipScale : public LLManip
 {
@@ -96,7 +103,7 @@ private:
 	void			renderSnapGuides( const LLBBox& local_bbox );
 
 	void			revert();
-	
+
 	inline void		conditionalHighlight( U32 part, const LLColor4* highlight = NULL, const LLColor4* normal = NULL );
 
 	void			drag( S32 x, S32 y );
@@ -135,33 +142,35 @@ private:
 	};
 
 
-	F32				mBoxHandleSize;		// The size of the handles at the corners of the bounding box
-	F32				mScaledBoxHandleSize; // handle size after scaling for selection feedback
+	F32				mBoxHandleSize; //!< The size of the handles at the corners of the bounding box.
+	F32				mScaledBoxHandleSize; //!< Handle size after scaling for selection feedback.
 	LLVector3d		mDragStartPointGlobal;
-	LLVector3d		mDragStartCenterGlobal;	// The center of the bounding box of all selected objects at time of drag start
+	LLVector3d		mDragStartCenterGlobal; //!< The center of the bounding box of all selected objects at time of drag start.
 	LLVector3d		mDragPointGlobal;
 	LLVector3d 		mDragFarHitGlobal;
 	S32				mLastMouseX;
 	S32				mLastMouseY;
 	BOOL			mSendUpdateOnMouseUp;
 	U32 			mLastUpdateFlags;
-	typedef std::set<ManipulatorHandle*, compare_manipulators> minpulator_list_t;
-	minpulator_list_t mProjectedManipulators;
+	typedef std::set<ManipulatorHandle*, compare_manipulators> manipulator_list_t;
+	manipulator_list_t mProjectedManipulators;
 	LLVector4		mManipulatorVertices[14];
-	F32				mScaleSnapUnit1;  // size of snap multiples for axis 1
-	F32				mScaleSnapUnit2;  // size of snap multiples for axis 2
-	LLVector3		mScalePlaneNormal1; // normal of plane in which scale occurs that most faces camera
-	LLVector3		mScalePlaneNormal2; // normal of plane in which scale occurs that most faces camera
-	LLVector3		mSnapGuideDir1;
-	LLVector3		mSnapGuideDir2;
-	LLVector3		mSnapDir1;
-	LLVector3		mSnapDir2;
-	F32				mSnapRegimeOffset;
+	F32				mScaleSnapUnit1; //!< Size of snap multiples for the upper scale.
+	F32				mScaleSnapUnit2; //!< Size of snap multiples for the lower scale.
+	LLVector3		mScalePlaneNormal1; //!< Normal of plane in which scale occurs that most faces camera.
+	LLVector3		mScalePlaneNormal2; //!< Normal of plane in which scale occurs that most faces camera.
+	LLVector3		mSnapGuideDir1; //!< The direction in which the upper snap guide tick marks face.
+	LLVector3		mSnapGuideDir2; //!< The direction in which the lower snap guide tick marks face.
+	LLVector3		mSnapDir1; //!< The direction in which the upper snap guides face.
+	LLVector3		mSnapDir2; //!< The direction in which the lower snap guides face.
+	F32				mSnapRegimeOffset; //!< How far off the scale axis centerline the mouse can be before it exits/enters the snap regime.
+	F32				mTickPixelSpacing1; //!< The pixel spacing between snap guide tick marks for the upper scale.
+	F32				mTickPixelSpacing2; //!< The pixel spacing between snap guide tick marks for the lower scale.
 	F32				mSnapGuideLength;
-	LLVector3		mScaleCenter;
-	LLVector3		mScaleDir;
-	F32				mScaleSnapValue;
-	BOOL			mInSnapRegime;
+	LLVector3		mScaleCenter; //!< The location of the origin of the scaling operation.
+	LLVector3		mScaleDir; //!< The direction of the scaling action.  In face-dragging this is aligned with one of the cardinal axis relative to the prim, but in corner-dragging this is along the diagonal.
+	F32				mScaleSnappedValue; //!< The distance of the current position nearest the mouse location, measured along mScaleDir.  Is measured either from the center or from the far face/corner depending upon whether uniform scaling is true or false respectively.
+	ESnapRegimes	mSnapRegime; //<! Which, if any, snap regime the cursor is currently residing in.
 	F32*			mManipulatorScales;
 };
 
diff --git a/indra/newview/llmaniptranslate.cpp b/indra/newview/llmaniptranslate.cpp
index 06bf294417..d237e5ef44 100755
--- a/indra/newview/llmaniptranslate.cpp
+++ b/indra/newview/llmaniptranslate.cpp
@@ -61,6 +61,7 @@
 #include "llui.h"
 #include "pipeline.h"
 #include "llviewershadermgr.h"
+#include "lltrans.h"
 
 const S32 NUM_AXES = 3;
 const S32 MOUSE_DRAG_SLOP = 2;       // pixels
@@ -111,7 +112,6 @@ LLManipTranslate::LLManipTranslate( LLToolComposite* composite )
 :	LLManip( std::string("Move"), composite ),
 	mLastHoverMouseX(-1),
 	mLastHoverMouseY(-1),
-	mSendUpdateOnMouseUp(FALSE),
 	mMouseOutsideSlop(FALSE),
 	mCopyMadeThisDrag(FALSE),
 	mMouseDownX(-1),
@@ -125,7 +125,6 @@ LLManipTranslate::LLManipTranslate( LLToolComposite* composite )
 	mSnapOffsetMeters(0.f),
 	mSubdivisions(10.f),
 	mInSnapRegime(FALSE),
-	mSnapped(FALSE),
 	mArrowScales(1.f, 1.f, 1.f),
 	mPlaneScales(1.f, 1.f, 1.f),
 	mPlaneManipPositions(1.f, 1.f, 1.f, 1.f)
@@ -1441,13 +1440,13 @@ void LLManipTranslate::renderSnapGuides()
 				LLVector3 help_text_pos = selection_center_start + (snap_offset_meters_up * 3.f * mSnapOffsetAxis);
 				const LLFontGL* big_fontp = LLFontGL::getFontSansSerif();
 
-				std::string help_text = "Move mouse cursor over ruler";
+				std::string help_text = LLTrans::getString("manip_hint1");
 				LLColor4 help_text_color = LLColor4::white;
 				help_text_color.mV[VALPHA] = clamp_rescale(mHelpTextTimer.getElapsedTimeF32(), sHelpTextVisibleTime, sHelpTextVisibleTime + sHelpTextFadeTime, line_alpha, 0.f);
-				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, mObjectSelection->getSelectType() == SELECT_TYPE_HUD);
-				help_text = "to snap to grid";
+				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, false);
+				help_text = LLTrans::getString("manip_hint2");
 				help_text_pos -= LLViewerCamera::getInstance()->getUpAxis() * mSnapOffsetMeters * 0.2f;
-				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, mObjectSelection->getSelectType() == SELECT_TYPE_HUD);
+				hud_render_utf8text(help_text, help_text_pos, *big_fontp, LLFontGL::NORMAL, LLFontGL::NO_SHADOW, -0.5f * big_fontp->getWidthF32(help_text), 3.f, help_text_color, false);
 			}
 		}
 	}
diff --git a/indra/newview/llmaniptranslate.h b/indra/newview/llmaniptranslate.h
index 37567c7bd1..3c37bbd698 100755
--- a/indra/newview/llmaniptranslate.h
+++ b/indra/newview/llmaniptranslate.h
@@ -85,7 +85,6 @@ protected:
 private:
 	S32			mLastHoverMouseX;
 	S32			mLastHoverMouseY;
-	BOOL		mSendUpdateOnMouseUp;
 	BOOL		mMouseOutsideSlop;		// true after mouse goes outside slop region
 	BOOL		mCopyMadeThisDrag;
 	S32			mMouseDownX;
@@ -107,7 +106,6 @@ private:
 	LLVector3	mGridScale;
 	F32			mSubdivisions;
 	BOOL		mInSnapRegime;
-	BOOL		mSnapped;
 	LLVector3	mArrowScales;
 	LLVector3	mPlaneScales;
 	LLVector4	mPlaneManipPositions;
diff --git a/indra/newview/skins/default/xui/en/strings.xml b/indra/newview/skins/default/xui/en/strings.xml
index 67f75fe1d2..bb01ee899f 100755
--- a/indra/newview/skins/default/xui/en/strings.xml
+++ b/indra/newview/skins/default/xui/en/strings.xml
@@ -419,6 +419,8 @@ Please try logging in again in a minute.</string>
 	<string name="multiple_textures">Multiple</string>
 
 <string name="use_texture">Use texture</string>
+    <string name="manip_hint1">Move mouse cursor over ruler</string>
+    <string name="manip_hint2">to snap to grid</string>
 
 	<!-- world map -->
 	<string name="texture_loading">Loading...</string>