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diff --git a/indra/newview/llbreastmotion.cpp b/indra/newview/llbreastmotion.cpp
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+/** 
+ * @file llbreastmotion.cpp
+ * @brief Implementation of LLBreastMotion class.
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+//-----------------------------------------------------------------------------
+// Header Files
+//-----------------------------------------------------------------------------
+#include "llviewerprecompiledheaders.h"
+#include "linden_common.h"
+
+#include "m3math.h"
+#include "v3dmath.h"
+
+#include "llbreastmotion.h"
+#include "llcharacter.h"
+#include "llviewercontrol.h"
+#include "llviewervisualparam.h"
+#include "llvoavatarself.h"
+
+#define MIN_REQUIRED_PIXEL_AREA_BREAST_MOTION 0.f;
+
+#define N_PARAMS 2
+
+// User-set params
+static const std::string breast_param_names_user[N_PARAMS] =
+{
+	"Breast_Female_Cleavage_Driver",
+	"Breast_Gravity_Driver"
+};
+
+// Params driven by this algorithm
+static const std::string breast_param_names_driven[N_PARAMS] =
+{
+	"Breast_Female_Cleavage",
+	"Breast_Gravity"
+};
+
+
+
+LLBreastMotion::LLBreastMotion(const LLUUID &id) : 
+	LLMotion(id),
+	mCharacter(NULL)
+{
+	mName = "breast_motion";
+	mChestState = new LLJointState;
+
+	mBreastMassParam = (F32)1.0;
+	mBreastDragParam = LLVector3((F32)0.1, (F32)0.1, (F32)0.1);
+	mBreastSmoothingParam = (U32)2;
+	mBreastGravityParam = (F32)0.0;
+
+	mBreastSpringParam = LLVector3((F32)3.0, (F32)0.0, (F32)3.0);
+	mBreastGainParam = LLVector3((F32)50.0, (F32)0.0, (F32)50.0);
+	mBreastDampingParam = LLVector3((F32)0.3, (F32)0.0, (F32)0.3);
+	mBreastMaxVelocityParam = LLVector3((F32)10.0, (F32)0.0, (F32)10.0);
+
+	mBreastParamsUser[0] = mBreastParamsUser[1] = mBreastParamsUser[2] = NULL;
+	mBreastParamsDriven[0] = mBreastParamsDriven[1] = mBreastParamsDriven[2] = NULL;
+
+	mCharLastPosition_world_pt = LLVector3(0,0,0);
+	mCharLastVelocity_local_vec = LLVector3(0,0,0);
+	mCharLastAcceleration_local_vec = LLVector3(0,0,0);
+	mBreastLastPosition_local_pt = LLVector3(0,0,0);
+	mBreastLastUpdatePosition_local_pt = LLVector3(0,0,0);
+	mBreastVelocity_local_vec = LLVector3(0,0,0);
+}
+
+LLBreastMotion::~LLBreastMotion()
+{
+}
+
+BOOL LLBreastMotion::onActivate() 
+{ 
+	return TRUE; 
+}
+
+void LLBreastMotion::onDeactivate() 
+{
+}
+
+LLMotion::LLMotionInitStatus LLBreastMotion::onInitialize(LLCharacter *character)
+{
+	mCharacter = character;
+
+	if (!mChestState->setJoint(character->getJoint("mChest")))
+	{
+		return STATUS_FAILURE;
+	}
+
+	mChestState->setUsage(LLJointState::ROT);
+	addJointState( mChestState );
+	
+	for (U32 i=0; i < N_PARAMS; i++)
+	{
+		mBreastParamsUser[i] = NULL;
+		mBreastParamsDriven[i] = NULL;
+		mBreastParamsMin[i] = 0;
+		mBreastParamsMax[i] = 0;
+		if (breast_param_names_user[i] != "" && breast_param_names_driven[i] != "")
+		{
+			mBreastParamsUser[i] = (LLViewerVisualParam*)mCharacter->getVisualParam(breast_param_names_user[i].c_str());
+			mBreastParamsDriven[i] = (LLViewerVisualParam*)mCharacter->getVisualParam(breast_param_names_driven[i].c_str());
+			if (mBreastParamsDriven[i])
+			{
+				mBreastParamsMin[i] = mBreastParamsDriven[i]->getMinWeight();
+				mBreastParamsMax[i] = mBreastParamsDriven[i]->getMaxWeight();
+			}
+		}
+	}
+	
+	mTimer.reset();
+	return STATUS_SUCCESS;
+}
+
+F32 LLBreastMotion::getMinPixelArea() 
+{
+	return MIN_REQUIRED_PIXEL_AREA_BREAST_MOTION;
+}
+	
+
+F32 LLBreastMotion::calculateTimeDelta()
+{
+	const F32 time = mTimer.getElapsedTimeF32();
+	const F32 time_delta = time - mLastTime;
+	mLastTime = time;
+	return time_delta;
+}
+
+// Local space means "parameter space".
+LLVector3 LLBreastMotion::toLocal(const LLVector3 &world_vector)
+{
+	LLVector3 local_vec(0,0,0);
+
+	LLJoint *chest_joint = mChestState->getJoint();
+	const LLQuaternion world_rot = chest_joint->getWorldRotation();
+	
+	// Cleavage
+	LLVector3 breast_dir_world_vec = LLVector3(-1,0,0) * world_rot; // -1 b/c cleavage param changes opposite to direction
+	breast_dir_world_vec.normalize();
+	local_vec[0] = world_vector * breast_dir_world_vec;
+	
+	// Up-Down Bounce
+	LLVector3 breast_up_dir_world_vec = LLVector3(0,0,1) * world_rot;
+	breast_up_dir_world_vec.normalize();
+	local_vec[1] = world_vector * breast_up_dir_world_vec;
+
+	return local_vec;
+}
+
+LLVector3 LLBreastMotion::calculateVelocity_local(const F32 time_delta)
+{
+	LLJoint *chest_joint = mChestState->getJoint();
+	const LLVector3 world_pos_pt = chest_joint->getWorldPosition();
+	const LLQuaternion world_rot = chest_joint->getWorldRotation();
+	const LLVector3 last_world_pos_pt = mCharLastPosition_world_pt;
+	const LLVector3 char_velocity_world_vec = (world_pos_pt-last_world_pos_pt) / time_delta;
+	const LLVector3 char_velocity_local_vec = toLocal(char_velocity_world_vec);
+
+	return char_velocity_local_vec;
+}
+
+LLVector3 LLBreastMotion::calculateAcceleration_local(const LLVector3 &new_char_velocity_local_vec,
+													  const F32 time_delta)
+{
+	LLVector3 char_acceleration_local_vec = new_char_velocity_local_vec - mCharLastVelocity_local_vec;
+	
+	char_acceleration_local_vec = 
+		char_acceleration_local_vec * 1.0/mBreastSmoothingParam + 
+		mCharLastAcceleration_local_vec * (mBreastSmoothingParam-1.0)/mBreastSmoothingParam;
+
+	mCharLastAcceleration_local_vec = char_acceleration_local_vec;
+
+	return char_acceleration_local_vec;
+}
+
+BOOL LLBreastMotion::onUpdate(F32 time, U8* joint_mask)
+{
+	// Skip if disabled globally.
+	if (!gSavedSettings.getBOOL("AvatarPhysics"))
+	{
+		return TRUE;
+	}
+
+	// Higher LOD is better.  This controls the granularity
+	// and frequency of updates for the motions.
+	const F32 lod_factor = LLVOAvatar::sPhysicsLODFactor;
+	if (lod_factor == 0)
+	{
+		return TRUE;
+	}
+	
+	if (mCharacter->getSex() != SEX_FEMALE) return TRUE;
+	const F32 time_delta = calculateTimeDelta();
+	if (time_delta < .01 || time_delta > 10.0) return TRUE;
+
+
+	////////////////////////////////////////////////////////////////////////////////
+	// Get all parameters and settings
+	//
+
+	mBreastMassParam = mCharacter->getVisualParamWeight("Breast_Physics_Mass");
+	mBreastSmoothingParam = (U32)(mCharacter->getVisualParamWeight("Breast_Physics_Smoothing"));
+	mBreastGravityParam = mCharacter->getVisualParamWeight("Breast_Physics_Gravity");
+
+	mBreastSpringParam[0] = mCharacter->getVisualParamWeight("Breast_Physics_Side_Spring");
+	mBreastGainParam[0] = mCharacter->getVisualParamWeight("Breast_Physics_Side_Gain");
+	mBreastDampingParam[0] = mCharacter->getVisualParamWeight("Breast_Physics_Side_Damping");
+	mBreastMaxVelocityParam[0] = mCharacter->getVisualParamWeight("Breast_Physics_Side_Max_Velocity");
+	mBreastDragParam[0] = mCharacter->getVisualParamWeight("Breast_Physics_Side_Drag");
+
+	mBreastSpringParam[1] = mCharacter->getVisualParamWeight("Breast_Physics_UpDown_Spring");
+	mBreastGainParam[1] = mCharacter->getVisualParamWeight("Breast_Physics_UpDown_Gain");
+	mBreastDampingParam[1] = mCharacter->getVisualParamWeight("Breast_Physics_UpDown_Damping");
+	mBreastMaxVelocityParam[1] = mCharacter->getVisualParamWeight("Breast_Physics_UpDown_Max_Velocity");
+	mBreastDragParam[1] = mCharacter->getVisualParamWeight("Breast_Physics_UpDown_Drag");
+
+
+	// Get the current morph parameters.
+	LLVector3 breast_user_local_pt(0,0,0);
+	for (U32 i=0; i < N_PARAMS; i++)
+	{
+		if (mBreastParamsUser[i] != NULL)
+		{
+			breast_user_local_pt[i] = mBreastParamsUser[i]->getWeight();
+		}
+	}
+	
+	LLVector3 breast_current_local_pt = mBreastLastPosition_local_pt;
+
+	//
+	// End parameters and settings
+	////////////////////////////////////////////////////////////////////////////////
+
+
+	////////////////////////////////////////////////////////////////////////////////
+	// Calculate velocity and acceleration in parameter space.
+	//
+
+	const LLVector3 char_velocity_local_vec = calculateVelocity_local(time_delta);
+	const LLVector3 char_acceleration_local_vec = calculateAcceleration_local(char_velocity_local_vec, time_delta);
+	mCharLastVelocity_local_vec = char_velocity_local_vec;
+
+	LLJoint *chest_joint = mChestState->getJoint();
+	mCharLastPosition_world_pt = chest_joint->getWorldPosition();
+
+	//
+	// End velocity and acceleration
+	////////////////////////////////////////////////////////////////////////////////
+
+
+	////////////////////////////////////////////////////////////////////////////////
+	// Calculate the total force 
+	//
+
+	// Spring force is a restoring force towards the original user-set breast position.
+	// F = kx
+	const LLVector3 spring_length_local = breast_current_local_pt-breast_user_local_pt;
+	LLVector3 force_spring_local_vec = -spring_length_local; force_spring_local_vec *= mBreastSpringParam;
+
+	// Acceleration is the force that comes from the change in velocity of the torso.
+	// F = ma + mg
+	LLVector3 force_accel_local_vec = char_acceleration_local_vec * mBreastMassParam;
+	const LLVector3 force_gravity_local_vec = toLocal(LLVector3(0,0,1))* mBreastGravityParam * mBreastMassParam;
+	force_accel_local_vec += force_gravity_local_vec;
+	force_accel_local_vec *= mBreastGainParam;
+
+	// Damping is a restoring force that opposes the current velocity.
+	// F = -kv
+	LLVector3 force_damping_local_vec = -mBreastDampingParam; 
+	force_damping_local_vec *= mBreastVelocity_local_vec;
+	
+	// Drag is a force imparted by velocity, intuitively it is similar to wind resistance.
+	// F = .5v*v
+	LLVector3 force_drag_local_vec = .5*char_velocity_local_vec;
+	force_drag_local_vec *= char_velocity_local_vec;
+	force_drag_local_vec *= mBreastDragParam[0];
+
+	LLVector3 force_net_local_vec = 
+		force_accel_local_vec + 
+		force_gravity_local_vec +
+		force_spring_local_vec + 
+		force_damping_local_vec + 
+		force_drag_local_vec;
+
+	//
+	// End total force
+	////////////////////////////////////////////////////////////////////////////////
+
+	
+	////////////////////////////////////////////////////////////////////////////////
+	// Calculate new params
+	//
+
+	// Calculate the new acceleration based on the net force.
+	// a = F/m
+	LLVector3 acceleration_local_vec = force_net_local_vec / mBreastMassParam;
+	mBreastVelocity_local_vec += acceleration_local_vec;
+	mBreastVelocity_local_vec.clamp(-mBreastMaxVelocityParam*100.0, mBreastMaxVelocityParam*100.0);
+
+	// Temporary debugging setting to cause all avatars to move, for profiling purposes.
+	if (gSavedSettings.getBOOL("AvatarPhysicsTest"))
+	{
+		mBreastVelocity_local_vec[0] = sin(mTimer.getElapsedTimeF32()*4.0)*5.0;
+		mBreastVelocity_local_vec[1] = sin(mTimer.getElapsedTimeF32()*3.0)*5.0;
+	}
+	// Calculate the new parameters and clamp them to the min/max ranges.
+	LLVector3 new_local_pt = breast_current_local_pt + mBreastVelocity_local_vec*time_delta;
+	new_local_pt.clamp(mBreastParamsMin,mBreastParamsMax);
+		
+	// Set the new parameters.
+	for (U32 i=0; i < 3; i++)
+	{
+		// If the param is disabled, just set the param to the user value.
+		if (mBreastMaxVelocityParam[i] == 0)
+		{
+			new_local_pt[i] = breast_user_local_pt[i];
+		}
+		if (mBreastParamsDriven[i])
+		{
+			mCharacter->setVisualParamWeight(mBreastParamsDriven[i],
+											 new_local_pt[i],
+											 FALSE);
+		}
+	}
+
+	mBreastLastPosition_local_pt = new_local_pt;
+	
+	//
+	// End calculate new params
+	////////////////////////////////////////////////////////////////////////////////
+	
+
+	////////////////////////////////////////////////////////////////////////////////
+	// Conditionally update the visual params
+	//
+
+	// Updating the visual params (i.e. what the user sees) is fairly expensive.
+	// So only update if the params have changed enough, and also take into account
+	// the graphics LOD settings.
+	
+	// For non-self, if the avatar is small enough visually, then don't update.
+	const BOOL is_self = (dynamic_cast<LLVOAvatarSelf *>(this) != NULL);
+	if (!is_self)
+	{
+		const F32 area_for_max_settings = 0.0;
+		const F32 area_for_min_settings = 1400.0;
+
+		const F32 area_for_this_setting = area_for_max_settings + (area_for_min_settings-area_for_max_settings)*(1.0-lod_factor);
+		const F32 pixel_area = fsqrtf(mCharacter->getPixelArea());
+		if (pixel_area < area_for_this_setting)
+		{
+			return TRUE;
+		}
+	}
+
+	// If the parameter hasn't changed enough, then don't update.
+	LLVector3 position_diff = mBreastLastUpdatePosition_local_pt-new_local_pt;
+	for (U32 i=0; i < 3; i++)
+	{
+		const F32 min_delta = (1.0-lod_factor)*(mBreastParamsMax[i]-mBreastParamsMin[i])/2.0;
+		if (llabs(position_diff[i]) > min_delta)
+		{
+			mCharacter->updateVisualParams();
+			mBreastLastUpdatePosition_local_pt = new_local_pt;
+			return TRUE;
+		}
+	}
+	
+	//
+	// End update visual params
+	////////////////////////////////////////////////////////////////////////////////
+
+	return TRUE;
+}