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diff --git a/indra/newview/llviewercamera.cpp b/indra/newview/llviewercamera.cpp
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+++ b/indra/newview/llviewercamera.cpp
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+/** 
+ * @file llviewercamera.cpp
+ * @brief LLViewerCamera class implementation
+ *
+ * Copyright (c) 2002-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#include <iomanip> // for setprecision
+#include "llviewerprecompiledheaders.h"
+
+#include "llviewercamera.h"
+
+#include "llquaternion.h"
+
+#include "llagent.h"
+#include "llviewercontrol.h"
+#include "lldrawable.h"
+#include "llface.h"
+#include "llgl.h"
+#include "llglheaders.h"
+#include "llviewerobjectlist.h"
+#include "llviewerregion.h"
+#include "llviewerwindow.h"
+#include "llvovolume.h"
+#include "llworld.h"
+
+BOOL LLViewerCamera::sDisableCameraConstraints = FALSE;
+
+LLViewerCamera *gCamera = NULL;
+
+LLViewerCamera::LLViewerCamera() : LLCamera()
+{
+	calcProjection(getFar());
+	S32 i;
+	for (i = 0; i < 16; i++)
+	{
+		mGLProjectionMatrix[i] = 0.f;
+	}
+	mCameraFOVDefault = DEFAULT_FIELD_OF_VIEW;
+	mPixelMeterRatio = 0.f;
+	mScreenPixelArea = 0;
+	mZoomFactor = 1.f;
+	mZoomSubregion = 1;
+}
+
+void LLViewerCamera::updateCameraLocation(const LLVector3 &center,
+											const LLVector3 &up_direction,
+											const LLVector3 &point_of_interest)
+{
+	LLVector3 last_position;
+	LLVector3 last_axis;
+	last_position = getOrigin();
+	last_axis = getAtAxis();
+
+	mLastPointOfInterest = point_of_interest;
+
+	// constrain to max distance from avatar
+	LLVector3 camera_offset = center - gAgent.getPositionAgent();
+
+	setOriginAndLookAt(center, up_direction, point_of_interest);
+
+	F32 dpos = (center - last_position).magVec();
+	LLQuaternion rotation;
+	rotation.shortestArc(last_axis, getAtAxis());
+
+	F32 x, y, z;
+	F32 drot;
+	rotation.getAngleAxis(&drot, &x, &y, &z);
+	mVelocityStat.addValue(dpos);
+	mAngularVelocityStat.addValue(drot);
+	// update pixel meter ratio using default fov, not modified one
+	mPixelMeterRatio = mViewHeightInPixels / (2.f*tanf(mCameraFOVDefault*0.5));
+	// update screen pixel area
+	mScreenPixelArea =(S32)((F32)mViewHeightInPixels * ((F32)mViewHeightInPixels * mAspect));
+}
+
+// Handy copies of last good GL matrices
+F64	gGLModelView[16];
+S32	gGLViewport[4];
+
+const LLMatrix4 &LLViewerCamera::getProjection() const
+{
+	calcProjection(getFar());
+	return mProjectionMatrix;
+
+}
+
+const LLMatrix4 &LLViewerCamera::getModelview() const
+{
+	LLMatrix4 cfr(OGL_TO_CFR_ROTATION);
+	getMatrixToLocal(mModelviewMatrix);
+	mModelviewMatrix *= cfr;
+	return mModelviewMatrix;
+}
+
+void LLViewerCamera::calcProjection(const F32 far_distance) const
+{
+	F32 fov_y, z_far, z_near, aspect, f;
+	fov_y = getView();
+	z_far = far_distance;
+	z_near = getNear();
+	aspect = getAspect();
+
+	f = 1/tan(fov_y*0.5f);
+
+	mProjectionMatrix.zero();
+	mProjectionMatrix.mMatrix[0][0] = f/aspect;
+	mProjectionMatrix.mMatrix[1][1] = f;
+	mProjectionMatrix.mMatrix[2][2] = (z_far + z_near)/(z_near - z_far);
+	mProjectionMatrix.mMatrix[3][2] = (2*z_far*z_near)/(z_near - z_far);
+	mProjectionMatrix.mMatrix[2][3] = -1;
+}
+
+// Sets up opengl state for 3D drawing.  If for selection, also
+// sets up a pick matrix.  x and y are ignored if for_selection is false.
+// The picking region is centered on x,y and has the specified width and
+// height.
+
+LLMatrix4 gProjectionMat;
+
+void LLViewerCamera::updateFrustumPlanes()
+{
+	GLint viewport[4];
+	GLdouble model[16];
+	GLdouble proj[16];
+	GLdouble objX,objY,objZ;
+
+	LLVector3 frust[8];
+
+	glGetIntegerv(GL_VIEWPORT, viewport);
+	glGetDoublev(GL_MODELVIEW_MATRIX, model);
+	glGetDoublev(GL_PROJECTION_MATRIX,proj);
+
+	gluUnProject(viewport[0],viewport[1],0,model,proj,viewport,&objX,&objY,&objZ);
+	frust[0].setVec((F32)objX,(F32)objY,(F32)objZ);
+	gluUnProject(viewport[0]+viewport[2],viewport[1],0,model,proj,viewport,&objX,&objY,&objZ);
+	frust[1].setVec((F32)objX,(F32)objY,(F32)objZ);
+	gluUnProject(viewport[0]+viewport[2],viewport[1]+viewport[3],0,model,proj,viewport,&objX,&objY,&objZ);
+	frust[2].setVec((F32)objX,(F32)objY,(F32)objZ);
+	gluUnProject(viewport[0],viewport[1]+viewport[3],0,model,proj,viewport,&objX,&objY,&objZ);
+	frust[3].setVec((F32)objX,(F32)objY,(F32)objZ);
+	/*gluUnProject(viewport[0],viewport[1],1,model,proj,viewport,&objX,&objY,&objZ);
+	frust[4].setVec((F32)objX,(F32)objY,(F32)objZ);
+	gluUnProject(viewport[0]+viewport[2],viewport[1],1,model,proj,viewport,&objX,&objY,&objZ);
+	frust[5].setVec((F32)objX,(F32)objY,(F32)objZ);
+	gluUnProject(viewport[0]+viewport[2],viewport[1]+viewport[3],1,model,proj,viewport,&objX,&objY,&objZ);
+	frust[6].setVec((F32)objX,(F32)objY,(F32)objZ);
+	gluUnProject(viewport[0],viewport[1]+viewport[3],1,model,proj,viewport,&objX,&objY,&objZ);
+	frust[7].setVec((F32)objX,(F32)objY,(F32)objZ);*/
+	
+	for (U32 i = 0; i < 4; i++)
+	{
+		LLVector3 vec = frust[i] - getOrigin();
+		vec.normVec();
+		frust[i+4] = getOrigin() + vec*getFar()*2.0;
+	}
+
+	calcAgentFrustumPlanes(frust);
+}
+
+void LLViewerCamera::setPerspective(BOOL for_selection,
+									S32 x, S32 y_from_bot, S32 width, S32 height,
+									BOOL limit_select_distance,
+									F32 z_near, F32 z_far)
+{
+	F32 fov_y, aspect;
+	fov_y = RAD_TO_DEG * getView();
+	BOOL z_default_near, z_default_far = FALSE;
+	if (z_far <= 0)
+	{
+		z_default_far = TRUE;
+		z_far = getFar();
+	}
+	if (z_near <= 0)
+	{
+		z_default_near = TRUE;
+		z_near = getNear();
+	}
+	aspect = getAspect();
+
+	// Load camera view matrix
+	glMatrixMode( GL_PROJECTION );
+	glLoadIdentity();
+
+	if (for_selection)
+	{
+		// make a tiny little viewport
+		// anything drawn into this viewport will be "selected"
+		const U8	VIEWPORT_VECTOR_LEN = 4;
+		GLint		viewport[VIEWPORT_VECTOR_LEN];
+		glGetIntegerv(GL_VIEWPORT, viewport);
+		gluPickMatrix(x + width / 2, y_from_bot + height / 2, width, height, viewport);
+
+		if (limit_select_distance)
+		{
+			// ...select distance from control
+			z_far = gSavedSettings.getF32("MaxSelectDistance");
+		}
+		else
+		{
+			z_far = gAgent.mDrawDistance;
+		}
+	}
+	else
+	{
+		// Only override the far clip if it's not passed in explicitly.
+		if (z_default_far)
+		{
+			z_far = MAX_FAR_CLIP;
+		}
+		glViewport(x, y_from_bot, width, height);
+	}
+	
+	if (mZoomFactor > 1.f)
+	{
+		float offset = mZoomFactor - 1.f;
+		int pos_y = mZoomSubregion / llceil(mZoomFactor);
+		int pos_x = mZoomSubregion - (pos_y*llceil(mZoomFactor));
+		glTranslatef(offset - (F32)pos_x * 2.f, offset - (F32)pos_y * 2.f, 0.f);
+		glScalef(mZoomFactor, mZoomFactor, 1.f);
+	}
+
+	calcProjection(z_far); // Update the projection matrix cache
+
+	gluPerspective(fov_y,
+				   aspect,
+				   z_near,
+				   z_far);
+	glGetFloatv(GL_PROJECTION_MATRIX, (float*)&gProjectionMat);
+	
+	glMatrixMode( GL_MODELVIEW );
+
+	glLoadMatrixf(OGL_TO_CFR_ROTATION);		// Load Cory's favorite reference frame
+
+	GLfloat			ogl_matrix[16];
+	getOpenGLTransform(ogl_matrix);
+	glMultMatrixf(ogl_matrix);
+
+	if (for_selection && (width > 1 || height > 1))
+	{
+		calculateFrustumPlanesFromWindow((F32)(x - width / 2) / (F32)gViewerWindow->getWindowWidth() - 0.5f,
+								(F32)(y_from_bot - height / 2) / (F32)gViewerWindow->getWindowHeight() - 0.5f,
+								(F32)(x + width / 2) / (F32)gViewerWindow->getWindowWidth() - 0.5f,
+								(F32)(y_from_bot + height / 2) / (F32)gViewerWindow->getWindowHeight() - 0.5f);
+
+	}
+
+	// if not picking and not doing a snapshot, cache various GL matrices
+	if (!for_selection && mZoomFactor == 1.f)
+	{
+		// Save GL matrices for access elsewhere in code, especially project_world_to_screen
+		glGetDoublev(GL_PROJECTION_MATRIX, mGLProjectionMatrix);
+		glGetDoublev(GL_MODELVIEW_MATRIX, gGLModelView);
+		glGetIntegerv(GL_VIEWPORT, (GLint*)gGLViewport);
+	}
+
+	updateFrustumPlanes();
+
+	if (gSavedSettings.getBOOL("CameraOffset"))
+	{
+		glMatrixMode(GL_PROJECTION);
+		glTranslatef(0,0,-50);
+		glRotatef(20.0,1,0,0);
+		glMatrixMode(GL_MODELVIEW);
+	}
+}
+
+
+// Uses the last GL matrices set in set_perspective to project a point from
+// screen coordinates to the agent's region.
+void LLViewerCamera::projectScreenToPosAgent(const S32 screen_x, const S32 screen_y, LLVector3* pos_agent) const
+{
+
+	GLdouble x, y, z;
+	gluUnProject(
+		GLdouble(screen_x), GLdouble(screen_y), 0.0,
+		gGLModelView, mGLProjectionMatrix, (GLint*)gGLViewport,
+		&x,
+		&y,
+		&z );
+	pos_agent->setVec( (F32)x, (F32)y, (F32)z );
+}
+
+// Uses the last GL matrices set in set_perspective to project a point from
+// the agent's region space to screen coordinates.  Returns TRUE if point in within
+// the current window.
+BOOL LLViewerCamera::projectPosAgentToScreen(const LLVector3 &pos_agent, LLCoordGL &out_point, const BOOL clamp) const
+{
+	BOOL in_front = TRUE;
+	GLdouble	x, y, z;			// object's window coords, GL-style
+
+	LLVector3 dir_to_point = pos_agent - getOrigin();
+	dir_to_point /= dir_to_point.magVec();
+
+	if (dir_to_point * getAtAxis() < 0.f)
+	{
+		if (clamp)
+		{
+			return FALSE;
+		}
+		else
+		{
+			in_front = FALSE;
+		}
+	}
+
+	if (GL_TRUE == gluProject(pos_agent.mV[VX], pos_agent.mV[VY], pos_agent.mV[VZ],
+								gGLModelView, mGLProjectionMatrix, (GLint*)gGLViewport,
+								&x, &y, &z))
+	{
+		// convert screen coordinates to virtual UI coordinates
+		x /= gViewerWindow->getDisplayScale().mV[VX];
+		y /= gViewerWindow->getDisplayScale().mV[VY];
+
+		// should now have the x,y coords of grab_point in screen space
+		const LLRect& window_rect = gViewerWindow->getWindowRect();
+
+		// ...sanity check
+		S32 int_x = lltrunc(x);
+		S32 int_y = lltrunc(y);
+
+		BOOL valid = TRUE;
+
+		if (clamp)
+		{
+			if (int_x < window_rect.mLeft)
+			{
+				out_point.mX = window_rect.mLeft;
+				valid = FALSE;
+			}
+			else if (int_x > window_rect.mRight)
+			{
+				out_point.mX = window_rect.mRight;
+				valid = FALSE;
+			}
+			else
+			{
+				out_point.mX = int_x;
+			}
+
+			if (int_y < window_rect.mBottom)
+			{
+				out_point.mY = window_rect.mBottom;
+				valid = FALSE;
+			}
+			else if (int_y > window_rect.mTop)
+			{
+				out_point.mY = window_rect.mTop;
+				valid = FALSE;
+			}
+			else
+			{
+				out_point.mY = int_y;
+			}
+			return valid;
+		}
+		else
+		{
+			out_point.mX = int_x;
+			out_point.mY = int_y;
+
+			if (int_x < window_rect.mLeft)
+			{
+				valid = FALSE;
+			}
+			else if (int_x > window_rect.mRight)
+			{
+				valid = FALSE;
+			}
+			if (int_y < window_rect.mBottom)
+			{
+				valid = FALSE;
+			}
+			else if (int_y > window_rect.mTop)
+			{
+				valid = FALSE;
+			}
+
+			return in_front && valid;
+		}
+	}
+	else
+	{
+		return FALSE;
+	}
+}
+
+// Uses the last GL matrices set in set_perspective to project a point from
+// the agent's region space to the nearest edge in screen coordinates.
+// Returns TRUE if projection succeeds.
+BOOL LLViewerCamera::projectPosAgentToScreenEdge(const LLVector3 &pos_agent,
+												LLCoordGL &out_point) const
+{
+	LLVector3 dir_to_point = pos_agent - getOrigin();
+	dir_to_point /= dir_to_point.magVec();
+
+	BOOL in_front = TRUE;
+	if (dir_to_point * getAtAxis() < 0.f)
+	{
+		in_front = FALSE;
+	}
+
+	GLdouble	x, y, z;			// object's window coords, GL-style
+	if (GL_TRUE == gluProject(pos_agent.mV[VX], pos_agent.mV[VY],
+							  pos_agent.mV[VZ], gGLModelView,
+							  mGLProjectionMatrix, (GLint*)gGLViewport,
+							  &x, &y, &z))
+	{
+		x /= gViewerWindow->getDisplayScale().mV[VX];
+		y /= gViewerWindow->getDisplayScale().mV[VY];
+		// should now have the x,y coords of grab_point in screen space
+		const LLRect& window_rect = gViewerWindow->getVirtualWindowRect();
+
+		// ...sanity check
+		S32 int_x = lltrunc(x);
+		S32 int_y = lltrunc(y);
+
+		// find the center
+		GLdouble center_x = (GLdouble)(0.5f * (window_rect.mLeft + window_rect.mRight));
+		GLdouble center_y = (GLdouble)(0.5f * (window_rect.mBottom + window_rect.mTop));
+
+		if (x == center_x  &&  y == center_y)
+		{
+			// can't project to edge from exact center
+			return FALSE;
+		}
+
+		// find the line from center to local
+		GLdouble line_x = x - center_x;
+		GLdouble line_y = y - center_y;
+
+		int_x = lltrunc(center_x);
+		int_y = lltrunc(center_y);
+
+
+		if (0.f == line_x)
+		{
+			// the slope of the line is undefined
+			if (line_y > 0.f)
+			{
+				int_y = window_rect.mTop;
+			}
+			else
+			{
+				int_y = window_rect.mBottom;
+			}
+		}
+		else if (0 == window_rect.getWidth())
+		{
+			// the diagonal slope of the view is undefined
+			if (y < window_rect.mBottom)
+			{
+				int_y = window_rect.mBottom;
+			}
+			else if ( y > window_rect.mTop)
+			{
+				int_y = window_rect.mTop;
+			}
+		}
+		else
+		{
+			F32 line_slope = (F32)(line_y / line_x);
+			F32 rect_slope = ((F32)window_rect.getHeight()) / ((F32)window_rect.getWidth());
+
+			if (fabs(line_slope) > rect_slope)
+			{
+				if (line_y < 0.f)
+				{
+					// bottom
+					int_y = window_rect.mBottom;
+				}
+				else
+				{
+					// top
+					int_y = window_rect.mTop;
+				}
+				int_x = lltrunc(((GLdouble)int_y - center_y) / line_slope + center_x);
+			}
+			else if (fabs(line_slope) < rect_slope)
+			{
+				if (line_x < 0.f)
+				{
+					// left
+					int_x = window_rect.mLeft;
+				}
+				else
+				{
+					// right
+					int_x = window_rect.mRight;
+				}
+				int_y = lltrunc(((GLdouble)int_x - center_x) * line_slope + center_y);
+			}
+			else
+			{
+				// exactly parallel ==> push to the corners
+				if (line_x > 0.f)
+				{
+					int_x = window_rect.mRight;
+				}
+				else
+				{
+					int_x = window_rect.mLeft;
+				}
+				if (line_y > 0.0f)
+				{
+					int_y = window_rect.mTop;
+				}
+				else
+				{
+					int_y = window_rect.mBottom;
+				}
+			}
+		}
+		if (!in_front)
+		{
+			int_x = window_rect.mLeft + window_rect.mRight - int_x;
+			int_y = window_rect.mBottom + window_rect.mTop - int_y;
+		}
+		out_point.mX = int_x;
+		out_point.mY = int_y;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+
+void LLViewerCamera::getPixelVectors(const LLVector3 &pos_agent, LLVector3 &up, LLVector3 &right)
+{
+	LLVector3 to_vec = pos_agent - getOrigin();
+
+	F32 at_dist = to_vec * getAtAxis();
+
+	F32 height_meters = at_dist* (F32)tan(getView()/2.f);
+	F32 height_pixels = getViewHeightInPixels()/2.f;
+
+	F32 pixel_aspect = gViewerWindow->getWindow()->getPixelAspectRatio();
+
+	F32 meters_per_pixel = height_meters / height_pixels;
+	up = getUpAxis() * meters_per_pixel * gViewerWindow->getDisplayScale().mV[VY];
+	right = -1.f * pixel_aspect * meters_per_pixel * getLeftAxis() * gViewerWindow->getDisplayScale().mV[VX];
+}
+
+LLVector3 LLViewerCamera::roundToPixel(const LLVector3 &pos_agent)
+{
+	F32 dist = (pos_agent - getOrigin()).magVec();
+	// Convert to screen space and back, preserving the depth.
+	LLCoordGL screen_point;
+	if (!projectPosAgentToScreen(pos_agent, screen_point, FALSE))
+	{
+		// Off the screen, just return the original position.
+		return pos_agent;
+	}
+
+	LLVector3 ray_dir;
+
+	projectScreenToPosAgent(screen_point.mX, screen_point.mY, &ray_dir);
+	ray_dir -= getOrigin();
+	ray_dir.normVec();
+
+	LLVector3 pos_agent_rounded = getOrigin() + ray_dir*dist;
+
+	/*
+	LLVector3 pixel_x, pixel_y;
+	getPixelVectors(pos_agent_rounded, pixel_y, pixel_x);
+	pos_agent_rounded += 0.5f*pixel_x, 0.5f*pixel_y;
+	*/
+	return pos_agent_rounded;
+}
+
+BOOL LLViewerCamera::cameraUnderWater() const
+{
+	return getOrigin().mV[VZ] < gAgent.getRegion()->getWaterHeight();
+}
+
+BOOL LLViewerCamera::areVertsVisible(LLViewerObject* volumep, BOOL all_verts)
+{
+	S32 i, num_faces;
+	LLDrawable* drawablep = volumep->mDrawable;
+
+	if (!drawablep)
+	{
+		return FALSE;
+	}
+
+	num_faces = drawablep->getNumFaces();
+	for (i = 0; i < num_faces; i++)
+	{
+		LLStrider<LLVector3> vertices;
+		LLFace* face = drawablep->getFace(i);
+		face->getVertices(vertices);
+		
+		for (S32 v = 0; v < (S32)drawablep->getFace(i)->getGeomCount(); v++)
+		{
+			LLVector3 vec = vertices[v];
+			if (!face->isState(LLFace::GLOBAL))
+			{
+				vec = vec*face->getRenderMatrix();
+			}
+			
+			BOOL in_frustum = pointInFrustum(vec) > 0;
+
+			if ( !in_frustum && all_verts ||
+				 in_frustum && !all_verts)
+			{
+				return !all_verts;
+			}
+		}
+	}
+	return all_verts;
+}