merge

1 files changed, 712 insertions, 701 deletions

diff --git a/indra/newview/llphysicsmotion.cpp b/indra/newview/llphysicsmotion.cpp
index acf8973f03..968e62a8c3 100644
--- a/indra/newview/llphysicsmotion.cpp
+++ b/indra/newview/llphysicsmotion.cpp
@@ -1,701 +1,712 @@
-/** 

- * @file llphysicsmotion.cpp

- * @brief Implementation of LLPhysicsMotion 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 "llphysicsmotion.h"

-#include "llcharacter.h"

-#include "llviewercontrol.h"

-#include "llviewervisualparam.h"

-#include "llvoavatarself.h"

-

-typedef std::map<std::string, std::string> controller_map_t;

-typedef std::map<std::string, F32> default_controller_map_t;

-

-#define MIN_REQUIRED_PIXEL_AREA_BREAST_MOTION 0.f;

-

-inline F64 llsgn(const F64 a)

-{

-        if (a >= 0)

-                return 1;

-        return -1;

-}

-

-/* 

-   At a high level, this works by setting temporary parameters that are not stored

-   in the avatar's list of params, and are not conveyed to other users.  We accomplish

-   this by creating some new temporary driven params inside avatar_lad that are then driven

-   by the actual params that the user sees and sets.  For example, in the old system,

-   the user sets a param called breast bouyancy, which controls the Z value of the breasts.

-   In our new system, the user still sets the breast bouyancy, but that param is redefined

-   as a driver param so that affects a new temporary driven param that the bounce is applied

-   to.

-*/

-

-class LLPhysicsMotion

-{

-public:

-        /*

-          param_driver_name: The param that controls the params that are being affected by the physics.

-          joint_name: The joint that the body part is attached to.  The joint is

-          used to determine the orientation (rotation) of the body part.

-

-          character: The avatar that this physics affects.

-

-          motion_direction_vec: The direction (in world coordinates) that determines the

-          motion.  For example, (0,0,1) is up-down, and means that up-down motion is what

-          determines how this joint moves.

-

-          controllers: The various settings (e.g. spring force, mass) that determine how

-          the body part behaves.

-        */

-        LLPhysicsMotion(const std::string &param_driver_name, 

-                        const std::string &joint_name,

-                        LLCharacter *character,

-                        const LLVector3 &motion_direction_vec,

-                        const controller_map_t &controllers) :

-                mParamDriverName(param_driver_name),

-                mJointName(joint_name),

-                mMotionDirectionVec(motion_direction_vec),

-                mParamDriver(NULL),

-                mParamControllers(controllers),

-                mCharacter(character),

-                mLastTime(0),

-                mPosition_local(0),

-                mVelocityJoint_local(0),

-                mPositionLastUpdate_local(0)

-        {

-                mJointState = new LLJointState;

-        }

-

-        BOOL initialize();

-

-        ~LLPhysicsMotion() {}

-

-        BOOL onUpdate(F32 time);

-

-        LLPointer<LLJointState> getJointState() 

-        {

-                return mJointState;

-        }

-protected:

-        F32 getParamValue(const std::string& controller_key)

-        {

-                const controller_map_t::const_iterator& entry = mParamControllers.find(controller_key);

-                if (entry == mParamControllers.end())

-                {

-                        return sDefaultController[controller_key];

-                }

-                const std::string& param_name = (*entry).second.c_str();

-                return mCharacter->getVisualParamWeight(param_name.c_str());

-        }

-        void setParamValue(LLViewerVisualParam *param,

-                           const F32 new_value_local);

-

-        F32 toLocal(const LLVector3 &world);

-        F32 calculateVelocity_local(const F32 time_delta);

-        F32 calculateAcceleration_local(F32 velocity_local,

-                                        const F32 time_delta);

-private:

-        const std::string mParamDriverName;

-        const std::string mParamControllerName;

-        const LLVector3 mMotionDirectionVec;

-        const std::string mJointName;

-

-        F32 mPosition_local;

-        F32 mVelocityJoint_local; // How fast the joint is moving

-        F32 mAccelerationJoint_local; // Acceleration on the joint

-

-        F32 mVelocity_local; // How fast the param is moving

-        F32 mPositionLastUpdate_local;

-        LLVector3 mPosition_world;

-

-        LLViewerVisualParam *mParamDriver;

-        const controller_map_t mParamControllers;

-        

-        LLPointer<LLJointState> mJointState;

-        LLCharacter *mCharacter;

-

-        F32 mLastTime;

-        

-        static default_controller_map_t sDefaultController;

-};

-

-default_controller_map_t initDefaultController()

-{

-        default_controller_map_t controller;

-        controller["Mass"] = 0.2f;

-        controller["Gravity"] = 0.0f;

-        controller["Damping"] = .05f;

-        controller["Drag"] = 0.15f;

-        controller["MaxEffect"] = 0.1f;

-        controller["Spring"] = 0.1f;

-        controller["Gain"] = 10.0f;

-        return controller;

-}

-

-default_controller_map_t LLPhysicsMotion::sDefaultController = initDefaultController();

-

-BOOL LLPhysicsMotion::initialize()

-{

-        if (!mJointState->setJoint(mCharacter->getJoint(mJointName.c_str())))

-                return FALSE;

-        mJointState->setUsage(LLJointState::ROT);

-

-        mParamDriver = (LLViewerVisualParam*)mCharacter->getVisualParam(mParamDriverName.c_str());

-        if (mParamDriver == NULL)

-        {

-                llinfos << "Failure reading in  [ " << mParamDriverName << " ]" << llendl;

-                return FALSE;

-        }

-

-        return TRUE;

-}

-

-LLPhysicsMotionController::LLPhysicsMotionController(const LLUUID &id) : 

-        LLMotion(id),

-        mCharacter(NULL)

-{

-        mName = "breast_motion";

-}

-

-LLPhysicsMotionController::~LLPhysicsMotionController()

-{

-        for (motion_vec_t::iterator iter = mMotions.begin();

-             iter != mMotions.end();

-             ++iter)

-        {

-                delete (*iter);

-        }

-}

-

-BOOL LLPhysicsMotionController::onActivate() 

-{ 

-        return TRUE; 

-}

-

-void LLPhysicsMotionController::onDeactivate() 

-{

-}

-

-LLMotion::LLMotionInitStatus LLPhysicsMotionController::onInitialize(LLCharacter *character)

-{

-        mCharacter = character;

-

-        mMotions.clear();

-

-        // Breast Cleavage

-        {

-                controller_map_t controller;

-                controller["Mass"] = "Breast_Physics_Mass";

-                controller["Gravity"] = "Breast_Physics_Gravity";

-                controller["Drag"] = "Breast_Physics_Drag";

-                controller["Damping"] = "Breast_Physics_InOut_Damping";

-                controller["MaxEffect"] = "Breast_Physics_InOut_Max_Effect";

-                controller["Spring"] = "Breast_Physics_InOut_Spring";

-                controller["Gain"] = "Breast_Physics_InOut_Gain";

-                LLPhysicsMotion *motion = new LLPhysicsMotion("Breast_Physics_InOut_Controller",

-                                                                                                          "mChest",

-                                                                                                          character,

-                                                                                                          LLVector3(-1,0,0),

-                                                                                                          controller);

-                if (!motion->initialize())

-                {

-                        llassert_always(FALSE);

-                        return STATUS_FAILURE;

-                }

-                addMotion(motion);

-        }

-

-        // Breast Bounce

-        {

-                controller_map_t controller;

-                controller["Mass"] = "Breast_Physics_Mass";

-                controller["Gravity"] = "Breast_Physics_Gravity";

-                controller["Drag"] = "Breast_Physics_Drag";

-                controller["Damping"] = "Breast_Physics_UpDown_Damping";

-                controller["MaxEffect"] = "Breast_Physics_UpDown_Max_Effect";

-                controller["Spring"] = "Breast_Physics_UpDown_Spring";

-                controller["Gain"] = "Breast_Physics_UpDown_Gain";

-                LLPhysicsMotion *motion = new LLPhysicsMotion("Breast_Physics_UpDown_Controller",

-                                                                                                          "mChest",

-                                                                                                          character,

-                                                                                                          LLVector3(0,0,1),

-                                                                                                          controller);

-                if (!motion->initialize())

-                {

-                        llassert_always(FALSE);

-                        return STATUS_FAILURE;

-                }

-                addMotion(motion);

-        }

-

-        // Breast Sway

-        {

-                controller_map_t controller;

-                controller["Mass"] = "Breast_Physics_Mass";

-                controller["Gravity"] = "Breast_Physics_Gravity";

-                controller["Drag"] = "Breast_Physics_Drag";

-                controller["Damping"] = "Breast_Physics_LeftRight_Damping";

-                controller["MaxEffect"] = "Breast_Physics_LeftRight_Max_Effect";

-                controller["Spring"] = "Breast_Physics_LeftRight_Spring";

-                controller["Gain"] = "Breast_Physics_LeftRight_Gain";

-                LLPhysicsMotion *motion = new LLPhysicsMotion("Breast_Physics_LeftRight_Controller",

-                                                                                                          "mChest",

-                                                                                                          character,

-                                                                                                          LLVector3(0,-1,0),

-                                                                                                          controller);

-                if (!motion->initialize())

-                {

-                        llassert_always(FALSE);

-                        return STATUS_FAILURE;

-                }

-                addMotion(motion);

-        }

-        // Butt Bounce

-        {

-                controller_map_t controller;

-                controller["Mass"] = "Butt_Physics_Mass";

-                controller["Gravity"] = "Butt_Physics_Gravity";

-                controller["Drag"] = "Butt_Physics_Drag";

-                controller["Damping"] = "Butt_Physics_UpDown_Damping";

-                controller["MaxEffect"] = "Butt_Physics_UpDown_Max_Effect";

-                controller["Spring"] = "Butt_Physics_UpDown_Spring";

-                controller["Gain"] = "Butt_Physics_UpDown_Gain";

-                LLPhysicsMotion *motion = new LLPhysicsMotion("Butt_Physics_UpDown_Controller",

-                                                                                                          "mPelvis",

-                                                                                                          character,

-                                                                                                          LLVector3(0,0,-1),

-                                                                                                          controller);

-                if (!motion->initialize())

-                {

-                        llassert_always(FALSE);

-                        return STATUS_FAILURE;

-                }

-                addMotion(motion);

-        }

-

-        // Butt LeftRight

-        {

-                controller_map_t controller;

-                controller["Mass"] = "Butt_Physics_Mass";

-                controller["Gravity"] = "Butt_Physics_Gravity";

-                controller["Drag"] = "Butt_Physics_Drag";

-                controller["Damping"] = "Butt_Physics_LeftRight_Damping";

-                controller["MaxEffect"] = "Butt_Physics_LeftRight_Max_Effect";

-                controller["Spring"] = "Butt_Physics_LeftRight_Spring";

-                controller["Gain"] = "Butt_Physics_LeftRight_Gain";

-                LLPhysicsMotion *motion = new LLPhysicsMotion("Butt_Physics_LeftRight_Controller",

-                                                                                                          "mPelvis",

-                                                                                                          character,

-                                                                                                          LLVector3(0,-1,0),

-                                                                                                          controller);

-                if (!motion->initialize())

-                {

-                        llassert_always(FALSE);

-                        return STATUS_FAILURE;

-                }

-                addMotion(motion);

-        }

-

-        // Belly Bounce

-        {

-                controller_map_t controller;

-                controller["Mass"] = "Belly_Physics_Mass";

-                controller["Gravity"] = "Belly_Physics_Gravity";

-                controller["Drag"] = "Belly_Physics_Drag";

-                controller["Damping"] = "Belly_Physics_UpDown_Damping";

-                controller["MaxEffect"] = "Belly_Physics_UpDown_Max_Effect";

-                controller["Spring"] = "Belly_Physics_UpDown_Spring";

-                controller["Gain"] = "Belly_Physics_UpDown_Gain";

-                LLPhysicsMotion *motion = new LLPhysicsMotion("Belly_Physics_UpDown_Controller",

-                                                                                                          "mPelvis",

-                                                                                                          character,

-                                                                                                          LLVector3(0,0,-1),

-                                                                                                          controller);

-                if (!motion->initialize())

-                {

-                        llassert_always(FALSE);

-                        return STATUS_FAILURE;

-                }

-                addMotion(motion);

-        }

-        

-        return STATUS_SUCCESS;

-}

-

-void LLPhysicsMotionController::addMotion(LLPhysicsMotion *motion)

-{

-        addJointState(motion->getJointState());

-        mMotions.push_back(motion);

-}

-

-F32 LLPhysicsMotionController::getMinPixelArea() 

-{

-        return MIN_REQUIRED_PIXEL_AREA_BREAST_MOTION;

-}

-

-// Local space means "parameter space".

-F32 LLPhysicsMotion::toLocal(const LLVector3 &world)

-{

-        LLJoint *joint = mJointState->getJoint();

-        const LLQuaternion rotation_world = joint->getWorldRotation();

-        

-        LLVector3 dir_world = mMotionDirectionVec * rotation_world;

-        dir_world.normalize();

-        return world * dir_world;

-}

-

-F32 LLPhysicsMotion::calculateVelocity_local(const F32 time_delta)

-{

-        LLJoint *joint = mJointState->getJoint();

-        const LLVector3 position_world = joint->getWorldPosition();

-        const LLQuaternion rotation_world = joint->getWorldRotation();

-        const LLVector3 last_position_world = mPosition_world;

-        const LLVector3 velocity_world = (position_world-last_position_world) / time_delta;

-        const F32 velocity_local = toLocal(velocity_world);

-        return velocity_local;

-}

-

-F32 LLPhysicsMotion::calculateAcceleration_local(const F32 velocity_local,

-                                                 const F32 time_delta)

-{

-//        const F32 smoothing = getParamValue("Smoothing");

-        static const F32 smoothing = 3.0f; // Removed smoothing param since it's probably not necessary

-        const F32 acceleration_local = velocity_local - mVelocityJoint_local;

-        

-        const F32 smoothed_acceleration_local = 

-                acceleration_local * 1.0/smoothing + 

-                mAccelerationJoint_local * (smoothing-1.0)/smoothing;

-        

-        return smoothed_acceleration_local;

-}

-

-BOOL LLPhysicsMotionController::onUpdate(F32 time, U8* joint_mask)

-{

-        // Skip if disabled globally.

-        if (!gSavedSettings.getBOOL("AvatarPhysics"))

-        {

-                return TRUE;

-        }

-        

-        BOOL update_visuals = FALSE;

-        for (motion_vec_t::iterator iter = mMotions.begin();

-             iter != mMotions.end();

-             ++iter)

-        {

-                LLPhysicsMotion *motion = (*iter);

-                update_visuals |= motion->onUpdate(time);

-        }

-                

-        if (update_visuals)

-                mCharacter->updateVisualParams();

-        

-        return TRUE;

-}

-

-

-// Return TRUE if character has to update visual params.

-BOOL LLPhysicsMotion::onUpdate(F32 time)

-{

-        // static FILE *mFileWrite = fopen("c:\\temp\\avatar_data.txt","w");

-        

-        if (!mParamDriver)

-                return FALSE;

-

-        if (!mLastTime)

-        {

-                mLastTime = time;

-                return FALSE;

-        }

-

-        ////////////////////////////////////////////////////////////////////////////////

-        // Get all parameters and settings

-        //

-

-        const F32 time_delta = time - mLastTime;

-        if (time_delta > 3.0 || time_delta <= 0.01)

-        {

-                mLastTime = time;

-                return FALSE;

-        }

-

-        // 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;

-        }

-

-        LLJoint *joint = mJointState->getJoint();

-

-        const F32 behavior_mass = getParamValue("Mass");

-        const F32 behavior_gravity = getParamValue("Gravity");

-        const F32 behavior_spring = getParamValue("Spring");

-        const F32 behavior_gain = getParamValue("Gain");

-        const F32 behavior_damping = getParamValue("Damping");

-        const F32 behavior_drag = getParamValue("Drag");

-        const BOOL physics_test = gSavedSettings.getBOOL("AvatarPhysicsTest");

-        

-        F32 behavior_maxeffect = getParamValue("MaxEffect");

-        if (physics_test)

-                behavior_maxeffect = 1.0f;

-        // Maximum effect is [0,1] range.

-        const F32 min_val = 0.5f-behavior_maxeffect/2.0;

-        const F32 max_val = 0.5f+behavior_maxeffect/2.0;

-

-        // mPositon_local should be in normalized 0,1 range already.  Just making sure...

-        F32 position_current_local = llclamp(mPosition_local,

-                                             0.0f,

-                                             1.0f);

-

-        // Normalize the param position to be from [0,1].

-        // We have to use normalized values because there may be more than one driven param,

-        // and each of these driven params may have its own range.

-        // This means we'll do all our calculations in normalized [0,1] local coordinates.

-        F32 position_user_local = mParamDriver->getWeight();

-        position_user_local = (position_user_local - mParamDriver->getMinWeight()) / (mParamDriver->getMaxWeight() - mParamDriver->getMinWeight());

-

-        // If the effect is turned off then don't process unless we need one more update

-        // to set the position to the default (i.e. user) position.

-        if ((behavior_maxeffect == 0) && (position_current_local == position_user_local))

-        {

-            return FALSE;

-        }

-

-        //

-        // End parameters and settings

-        ////////////////////////////////////////////////////////////////////////////////

-

-

-        ////////////////////////////////////////////////////////////////////////////////

-        // Calculate velocity and acceleration in parameter space.

-        //

-        

-        const F32 velocity_joint_local = calculateVelocity_local(time_delta);

-        const F32 acceleration_joint_local = calculateAcceleration_local(velocity_joint_local, time_delta);

-

-        //

-        // End velocity and acceleration

-        ////////////////////////////////////////////////////////////////////////////////

-

-

-        ////////////////////////////////////////////////////////////////////////////////

-        // Calculate the total force 

-        //

-

-        // Spring force is a restoring force towards the original user-set breast position.

-        // F = kx

-        const F32 spring_length = position_current_local - position_user_local;

-        const F32 force_spring = -spring_length * behavior_spring;

-

-        // Acceleration is the force that comes from the change in velocity of the torso.

-        // F = ma

-        const F32 force_accel = behavior_gain * (acceleration_joint_local * behavior_mass);

-

-        // Gravity always points downward in world space.

-        // F = mg

-        const LLVector3 gravity_world(0,0,1);

-        const F32 force_gravity = behavior_gain * (toLocal(gravity_world) * behavior_gravity * behavior_mass);

-                

-        // Damping is a restoring force that opposes the current velocity.

-        // F = -kv

-        const F32 force_damping = -behavior_damping * mVelocity_local;

-                

-        // Drag is a force imparted by velocity (intuitively it is similar to wind resistance)

-        // F = .5kv^2

-        const F32 force_drag = .5*behavior_drag*velocity_joint_local*velocity_joint_local*llsgn(velocity_joint_local);

-

-        const F32 force_net = (force_accel + 

-                               force_gravity +

-                               force_spring + 

-                               force_damping + 

-                               force_drag);

-

-        //

-        // End total force

-        ////////////////////////////////////////////////////////////////////////////////

-

-        

-        ////////////////////////////////////////////////////////////////////////////////

-        // Calculate new params

-        //

-

-        // Calculate the new acceleration based on the net force.

-        // a = F/m

-        const F32 acceleration_new_local = force_net / behavior_mass;

-        static const F32 max_acceleration = 10.0f; // magic number, used to be customizable.

-        F32 velocity_new_local = mVelocity_local + acceleration_new_local;

-        velocity_new_local = llclamp(velocity_new_local, 

-                                     -max_acceleration, max_acceleration);

-        

-        // Temporary debugging setting to cause all avatars to move, for profiling purposes.

-        if (physics_test)

-        {

-                velocity_new_local = sin(time*4.0);

-        }

-        // Calculate the new parameters, or remain unchanged if max speed is 0.

-        F32 position_new_local = position_current_local + velocity_new_local*time_delta;

-        if (behavior_maxeffect == 0)

-            position_new_local = position_user_local;

-

-        // Zero out the velocity if the param is being pushed beyond its limits.

-        if ((position_new_local < min_val && velocity_new_local < 0) || 

-            (position_new_local > max_val && velocity_new_local > 0))

-        {

-                velocity_new_local = 0;

-        }

-

-        const F32 position_new_local_clamped = llclamp(position_new_local,

-                                                       min_val,

-                                                       max_val);

-

-        LLDriverParam *driver_param = dynamic_cast<LLDriverParam *>(mParamDriver);

-        llassert_always(driver_param);

-        if (driver_param)

-        {

-                // If this is one of our "hidden" driver params, then make sure it's

-                // the default value.

-                if ((driver_param->getGroup() != VISUAL_PARAM_GROUP_TWEAKABLE) &&

-                    (driver_param->getGroup() != VISUAL_PARAM_GROUP_TWEAKABLE_NO_TRANSMIT))

-                {

-                        mCharacter->setVisualParamWeight(driver_param,

-                                                         0,

-                                                         FALSE);

-                }

-                for (LLDriverParam::entry_list_t::iterator iter = driver_param->mDriven.begin();

-                     iter != driver_param->mDriven.end();

-                     ++iter)

-                {

-                        LLDrivenEntry &entry = (*iter);

-                        LLViewerVisualParam *driven_param = entry.mParam;

-                        setParamValue(driven_param,position_new_local_clamped);

-                }

-        }

-        

-        //

-        // 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.

-        

-        BOOL update_visuals = FALSE;

-

-        // For non-self, if the avatar is small enough visually, then don't update.

-        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());

-        

-        const BOOL is_self = (dynamic_cast<LLVOAvatarSelf *>(mCharacter) != NULL);

-        if ((pixel_area > area_for_this_setting) || is_self)

-        {

-                const F32 position_diff_local = llabs(mPositionLastUpdate_local-position_new_local_clamped);

-                const F32 min_delta = (1.01f-lod_factor)*0.4f;

-                if (llabs(position_diff_local) > min_delta)

-                {

-                        update_visuals = TRUE;

-                        mPositionLastUpdate_local = position_new_local;

-                }

-        }

-

-        //

-        // End update visual params

-        ////////////////////////////////////////////////////////////////////////////////

-

-        mVelocityJoint_local = velocity_joint_local;

-

-        mVelocity_local = velocity_new_local;

-        mAccelerationJoint_local = acceleration_joint_local;

-        mPosition_local = position_new_local;

-

-        mPosition_world = joint->getWorldPosition();

-        mLastTime = time;

-

-        /*

-          // Write out debugging info into a spreadsheet.

-          if (mFileWrite != NULL && is_self)

-          {

-          fprintf(mFileWrite,"%f\t%f\t%f \t\t%f \t\t%f\t%f\t%f\t \t\t%f\t%f\t%f\t%f\t%f \t\t%f\t%f\t%f\n",

-          position_new_local,

-          velocity_new_local,

-          acceleration_new_local,

-

-          time_delta,

-

-          mPosition_world[0],

-          mPosition_world[1],

-          mPosition_world[2],

-

-          force_net,

-          force_spring,

-          force_accel,

-          force_damping,

-          force_drag,

-

-          spring_length,

-          velocity_joint_local,

-          acceleration_joint_local

-          );

-          }

-        */

-

-        return update_visuals;

-}

-

-// Range of new_value_local is assumed to be [0 , 1] normalized.

-void LLPhysicsMotion::setParamValue(LLViewerVisualParam *param,

-                                    F32 new_value_normalized)

-{

-        const F32 value_min_local = param->getMinWeight();

-        const F32 value_max_local = param->getMaxWeight();

-

-        const F32 new_value_local = value_min_local + (value_max_local-value_min_local) * new_value_normalized;

-

-        mCharacter->setVisualParamWeight(param,

-                                         new_value_local,

-                                         FALSE);

-}

+/** 
+ * @file llphysicsmotion.cpp
+ * @brief Implementation of LLPhysicsMotion class.
+ *
+ * $LicenseInfo:firstyear=2011&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2011, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+//-----------------------------------------------------------------------------
+// Header Files
+//-----------------------------------------------------------------------------
+#include "llviewerprecompiledheaders.h"
+#include "linden_common.h"
+
+#include "m3math.h"
+#include "v3dmath.h"
+
+#include "llphysicsmotion.h"
+#include "llagent.h"
+#include "llcharacter.h"
+#include "llviewercontrol.h"
+#include "llviewervisualparam.h"
+#include "llvoavatarself.h"
+
+typedef std::map<std::string, std::string> controller_map_t;
+typedef std::map<std::string, F32> default_controller_map_t;
+
+#define MIN_REQUIRED_PIXEL_AREA_BREAST_MOTION 0.f;
+
+inline F64 llsgn(const F64 a)
+{
+        if (a >= 0)
+                return 1;
+        return -1;
+}
+
+/* 
+   At a high level, this works by setting temporary parameters that are not stored
+   in the avatar's list of params, and are not conveyed to other users.  We accomplish
+   this by creating some new temporary driven params inside avatar_lad that are then driven
+   by the actual params that the user sees and sets.  For example, in the old system,
+   the user sets a param called breast bouyancy, which controls the Z value of the breasts.
+   In our new system, the user still sets the breast bouyancy, but that param is redefined
+   as a driver param so that affects a new temporary driven param that the bounce is applied
+   to.
+*/
+
+class LLPhysicsMotion
+{
+public:
+        /*
+          param_driver_name: The param that controls the params that are being affected by the physics.
+          joint_name: The joint that the body part is attached to.  The joint is
+          used to determine the orientation (rotation) of the body part.
+
+          character: The avatar that this physics affects.
+
+          motion_direction_vec: The direction (in world coordinates) that determines the
+          motion.  For example, (0,0,1) is up-down, and means that up-down motion is what
+          determines how this joint moves.
+
+          controllers: The various settings (e.g. spring force, mass) that determine how
+          the body part behaves.
+        */
+        LLPhysicsMotion(const std::string &param_driver_name, 
+                        const std::string &joint_name,
+                        LLCharacter *character,
+                        const LLVector3 &motion_direction_vec,
+                        const controller_map_t &controllers) :
+                mParamDriverName(param_driver_name),
+                mJointName(joint_name),
+                mMotionDirectionVec(motion_direction_vec),
+                mParamDriver(NULL),
+                mParamControllers(controllers),
+                mCharacter(character),
+                mLastTime(0),
+                mPosition_local(0),
+                mVelocityJoint_local(0),
+                mPositionLastUpdate_local(0)
+        {
+                mJointState = new LLJointState;
+        }
+
+        BOOL initialize();
+
+        ~LLPhysicsMotion() {}
+
+        BOOL onUpdate(F32 time);
+
+        LLPointer<LLJointState> getJointState() 
+        {
+                return mJointState;
+        }
+protected:
+        F32 getParamValue(const std::string& controller_key)
+        {
+                const controller_map_t::const_iterator& entry = mParamControllers.find(controller_key);
+                if (entry == mParamControllers.end())
+                {
+                        return sDefaultController[controller_key];
+                }
+                const std::string& param_name = (*entry).second.c_str();
+                return mCharacter->getVisualParamWeight(param_name.c_str());
+        }
+        void setParamValue(LLViewerVisualParam *param,
+                           const F32 new_value_local);
+
+        F32 toLocal(const LLVector3 &world);
+        F32 calculateVelocity_local(const F32 time_delta);
+        F32 calculateAcceleration_local(F32 velocity_local,
+                                        const F32 time_delta);
+private:
+        const std::string mParamDriverName;
+        const std::string mParamControllerName;
+        const LLVector3 mMotionDirectionVec;
+        const std::string mJointName;
+
+        F32 mPosition_local;
+        F32 mVelocityJoint_local; // How fast the joint is moving
+        F32 mAccelerationJoint_local; // Acceleration on the joint
+
+        F32 mVelocity_local; // How fast the param is moving
+        F32 mPositionLastUpdate_local;
+        LLVector3 mPosition_world;
+
+        LLViewerVisualParam *mParamDriver;
+        const controller_map_t mParamControllers;
+        
+        LLPointer<LLJointState> mJointState;
+        LLCharacter *mCharacter;
+
+        F32 mLastTime;
+        
+        static default_controller_map_t sDefaultController;
+};
+
+default_controller_map_t initDefaultController()
+{
+        default_controller_map_t controller;
+        controller["Mass"] = 0.2f;
+        controller["Gravity"] = 0.0f;
+        controller["Damping"] = .05f;
+        controller["Drag"] = 0.15f;
+        controller["MaxEffect"] = 0.1f;
+        controller["Spring"] = 0.1f;
+        controller["Gain"] = 10.0f;
+        return controller;
+}
+
+default_controller_map_t LLPhysicsMotion::sDefaultController = initDefaultController();
+
+BOOL LLPhysicsMotion::initialize()
+{
+        if (!mJointState->setJoint(mCharacter->getJoint(mJointName.c_str())))
+                return FALSE;
+        mJointState->setUsage(LLJointState::ROT);
+
+        mParamDriver = (LLViewerVisualParam*)mCharacter->getVisualParam(mParamDriverName.c_str());
+        if (mParamDriver == NULL)
+        {
+                llinfos << "Failure reading in  [ " << mParamDriverName << " ]" << llendl;
+                return FALSE;
+        }
+
+        return TRUE;
+}
+
+LLPhysicsMotionController::LLPhysicsMotionController(const LLUUID &id) : 
+        LLMotion(id),
+        mCharacter(NULL)
+{
+        mName = "breast_motion";
+}
+
+LLPhysicsMotionController::~LLPhysicsMotionController()
+{
+        for (motion_vec_t::iterator iter = mMotions.begin();
+             iter != mMotions.end();
+             ++iter)
+        {
+                delete (*iter);
+        }
+}
+
+BOOL LLPhysicsMotionController::onActivate() 
+{ 
+        return TRUE; 
+}
+
+void LLPhysicsMotionController::onDeactivate() 
+{
+}
+
+LLMotion::LLMotionInitStatus LLPhysicsMotionController::onInitialize(LLCharacter *character)
+{
+        mCharacter = character;
+
+        mMotions.clear();
+
+        // Breast Cleavage
+        {
+                controller_map_t controller;
+                controller["Mass"] = "Breast_Physics_Mass";
+                controller["Gravity"] = "Breast_Physics_Gravity";
+                controller["Drag"] = "Breast_Physics_Drag";
+                controller["Damping"] = "Breast_Physics_InOut_Damping";
+                controller["MaxEffect"] = "Breast_Physics_InOut_Max_Effect";
+                controller["Spring"] = "Breast_Physics_InOut_Spring";
+                controller["Gain"] = "Breast_Physics_InOut_Gain";
+                LLPhysicsMotion *motion = new LLPhysicsMotion("Breast_Physics_InOut_Controller",
+                                                                                                          "mChest",
+                                                                                                          character,
+                                                                                                          LLVector3(-1,0,0),
+                                                                                                          controller);
+                if (!motion->initialize())
+                {
+                        llassert_always(FALSE);
+                        return STATUS_FAILURE;
+                }
+                addMotion(motion);
+        }
+
+        // Breast Bounce
+        {
+                controller_map_t controller;
+                controller["Mass"] = "Breast_Physics_Mass";
+                controller["Gravity"] = "Breast_Physics_Gravity";
+                controller["Drag"] = "Breast_Physics_Drag";
+                controller["Damping"] = "Breast_Physics_UpDown_Damping";
+                controller["MaxEffect"] = "Breast_Physics_UpDown_Max_Effect";
+                controller["Spring"] = "Breast_Physics_UpDown_Spring";
+                controller["Gain"] = "Breast_Physics_UpDown_Gain";
+                LLPhysicsMotion *motion = new LLPhysicsMotion("Breast_Physics_UpDown_Controller",
+                                                                                                          "mChest",
+                                                                                                          character,
+                                                                                                          LLVector3(0,0,1),
+                                                                                                          controller);
+                if (!motion->initialize())
+                {
+                        llassert_always(FALSE);
+                        return STATUS_FAILURE;
+                }
+                addMotion(motion);
+        }
+
+        // Breast Sway
+        {
+                controller_map_t controller;
+                controller["Mass"] = "Breast_Physics_Mass";
+                controller["Gravity"] = "Breast_Physics_Gravity";
+                controller["Drag"] = "Breast_Physics_Drag";
+                controller["Damping"] = "Breast_Physics_LeftRight_Damping";
+                controller["MaxEffect"] = "Breast_Physics_LeftRight_Max_Effect";
+                controller["Spring"] = "Breast_Physics_LeftRight_Spring";
+                controller["Gain"] = "Breast_Physics_LeftRight_Gain";
+                LLPhysicsMotion *motion = new LLPhysicsMotion("Breast_Physics_LeftRight_Controller",
+                                                                                                          "mChest",
+                                                                                                          character,
+                                                                                                          LLVector3(0,-1,0),
+                                                                                                          controller);
+                if (!motion->initialize())
+                {
+                        llassert_always(FALSE);
+                        return STATUS_FAILURE;
+                }
+                addMotion(motion);
+        }
+        // Butt Bounce
+        {
+                controller_map_t controller;
+                controller["Mass"] = "Butt_Physics_Mass";
+                controller["Gravity"] = "Butt_Physics_Gravity";
+                controller["Drag"] = "Butt_Physics_Drag";
+                controller["Damping"] = "Butt_Physics_UpDown_Damping";
+                controller["MaxEffect"] = "Butt_Physics_UpDown_Max_Effect";
+                controller["Spring"] = "Butt_Physics_UpDown_Spring";
+                controller["Gain"] = "Butt_Physics_UpDown_Gain";
+                LLPhysicsMotion *motion = new LLPhysicsMotion("Butt_Physics_UpDown_Controller",
+                                                                                                          "mPelvis",
+                                                                                                          character,
+                                                                                                          LLVector3(0,0,-1),
+                                                                                                          controller);
+                if (!motion->initialize())
+                {
+                        llassert_always(FALSE);
+                        return STATUS_FAILURE;
+                }
+                addMotion(motion);
+        }
+
+        // Butt LeftRight
+        {
+                controller_map_t controller;
+                controller["Mass"] = "Butt_Physics_Mass";
+                controller["Gravity"] = "Butt_Physics_Gravity";
+                controller["Drag"] = "Butt_Physics_Drag";
+                controller["Damping"] = "Butt_Physics_LeftRight_Damping";
+                controller["MaxEffect"] = "Butt_Physics_LeftRight_Max_Effect";
+                controller["Spring"] = "Butt_Physics_LeftRight_Spring";
+                controller["Gain"] = "Butt_Physics_LeftRight_Gain";
+                LLPhysicsMotion *motion = new LLPhysicsMotion("Butt_Physics_LeftRight_Controller",
+                                                                                                          "mPelvis",
+                                                                                                          character,
+                                                                                                          LLVector3(0,-1,0),
+                                                                                                          controller);
+                if (!motion->initialize())
+                {
+                        llassert_always(FALSE);
+                        return STATUS_FAILURE;
+                }
+                addMotion(motion);
+        }
+
+        // Belly Bounce
+        {
+                controller_map_t controller;
+                controller["Mass"] = "Belly_Physics_Mass";
+                controller["Gravity"] = "Belly_Physics_Gravity";
+                controller["Drag"] = "Belly_Physics_Drag";
+                controller["Damping"] = "Belly_Physics_UpDown_Damping";
+                controller["MaxEffect"] = "Belly_Physics_UpDown_Max_Effect";
+                controller["Spring"] = "Belly_Physics_UpDown_Spring";
+                controller["Gain"] = "Belly_Physics_UpDown_Gain";
+                LLPhysicsMotion *motion = new LLPhysicsMotion("Belly_Physics_UpDown_Controller",
+                                                                                                          "mPelvis",
+                                                                                                          character,
+                                                                                                          LLVector3(0,0,-1),
+                                                                                                          controller);
+                if (!motion->initialize())
+                {
+                        llassert_always(FALSE);
+                        return STATUS_FAILURE;
+                }
+                addMotion(motion);
+        }
+        
+        return STATUS_SUCCESS;
+}
+
+void LLPhysicsMotionController::addMotion(LLPhysicsMotion *motion)
+{
+        addJointState(motion->getJointState());
+        mMotions.push_back(motion);
+}
+
+F32 LLPhysicsMotionController::getMinPixelArea() 
+{
+        return MIN_REQUIRED_PIXEL_AREA_BREAST_MOTION;
+}
+
+// Local space means "parameter space".
+F32 LLPhysicsMotion::toLocal(const LLVector3 &world)
+{
+        LLJoint *joint = mJointState->getJoint();
+        const LLQuaternion rotation_world = joint->getWorldRotation();
+        
+        LLVector3 dir_world = mMotionDirectionVec * rotation_world;
+        dir_world.normalize();
+        return world * dir_world;
+}
+
+F32 LLPhysicsMotion::calculateVelocity_local(const F32 time_delta)
+{
+        LLJoint *joint = mJointState->getJoint();
+        const LLVector3 position_world = joint->getWorldPosition();
+        const LLQuaternion rotation_world = joint->getWorldRotation();
+        const LLVector3 last_position_world = mPosition_world;
+        const LLVector3 velocity_world = (position_world-last_position_world) / time_delta;
+        const F32 velocity_local = toLocal(velocity_world);
+        return velocity_local;
+}
+
+F32 LLPhysicsMotion::calculateAcceleration_local(const F32 velocity_local,
+                                                 const F32 time_delta)
+{
+//        const F32 smoothing = getParamValue("Smoothing");
+        static const F32 smoothing = 3.0f; // Removed smoothing param since it's probably not necessary
+        const F32 acceleration_local = velocity_local - mVelocityJoint_local;
+        
+        const F32 smoothed_acceleration_local = 
+                acceleration_local * 1.0/smoothing + 
+                mAccelerationJoint_local * (smoothing-1.0)/smoothing;
+        
+        return smoothed_acceleration_local;
+}
+
+BOOL LLPhysicsMotionController::onUpdate(F32 time, U8* joint_mask)
+{
+        // Skip if disabled globally.
+        if (!gSavedSettings.getBOOL("AvatarPhysics"))
+        {
+                return TRUE;
+        }
+        
+        BOOL update_visuals = FALSE;
+        for (motion_vec_t::iterator iter = mMotions.begin();
+             iter != mMotions.end();
+             ++iter)
+        {
+                LLPhysicsMotion *motion = (*iter);
+                update_visuals |= motion->onUpdate(time);
+        }
+                
+        if (update_visuals)
+                mCharacter->updateVisualParams();
+        
+        return TRUE;
+}
+
+
+// Return TRUE if character has to update visual params.
+BOOL LLPhysicsMotion::onUpdate(F32 time)
+{
+        // static FILE *mFileWrite = fopen("c:\\temp\\avatar_data.txt","w");
+        
+        if (!mParamDriver)
+                return FALSE;
+
+        if (!mLastTime)
+        {
+                mLastTime = time;
+                return FALSE;
+        }
+
+        ////////////////////////////////////////////////////////////////////////////////
+        // Get all parameters and settings
+        //
+
+        const F32 time_delta = time - mLastTime;
+        if (time_delta > 3.0 || time_delta <= 0.01)
+        {
+                mLastTime = time;
+                return FALSE;
+        }
+
+        // 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;
+        }
+
+        LLJoint *joint = mJointState->getJoint();
+
+        const F32 behavior_mass = getParamValue("Mass");
+        const F32 behavior_gravity = getParamValue("Gravity");
+        const F32 behavior_spring = getParamValue("Spring");
+        const F32 behavior_gain = getParamValue("Gain");
+        const F32 behavior_damping = getParamValue("Damping");
+        const F32 behavior_drag = getParamValue("Drag");
+        const BOOL physics_test = gSavedSettings.getBOOL("AvatarPhysicsTest") && gAgent.isGodlike();
+        
+        F32 behavior_maxeffect = getParamValue("MaxEffect");
+        if (physics_test)
+                behavior_maxeffect = 1.0f;
+        // Maximum effect is [0,1] range.
+        const F32 min_val = 0.5f-behavior_maxeffect/2.0;
+        const F32 max_val = 0.5f+behavior_maxeffect/2.0;
+
+        // mPositon_local should be in normalized 0,1 range already.  Just making sure...
+        F32 position_current_local = llclamp(mPosition_local,
+                                             0.0f,
+                                             1.0f);
+
+        // Normalize the param position to be from [0,1].
+        // We have to use normalized values because there may be more than one driven param,
+        // and each of these driven params may have its own range.
+        // This means we'll do all our calculations in normalized [0,1] local coordinates.
+        F32 position_user_local = mParamDriver->getWeight();
+        position_user_local = (position_user_local - mParamDriver->getMinWeight()) / (mParamDriver->getMaxWeight() - mParamDriver->getMinWeight());
+
+        // If the effect is turned off then don't process unless we need one more update
+        // to set the position to the default (i.e. user) position.
+        if ((behavior_maxeffect == 0) && (position_current_local == position_user_local))
+        {
+            return FALSE;
+        }
+
+        //
+        // End parameters and settings
+        ////////////////////////////////////////////////////////////////////////////////
+
+
+        ////////////////////////////////////////////////////////////////////////////////
+        // Calculate velocity and acceleration in parameter space.
+        //
+        
+        const F32 velocity_joint_local = calculateVelocity_local(time_delta);
+        const F32 acceleration_joint_local = calculateAcceleration_local(velocity_joint_local, time_delta);
+
+        //
+        // End velocity and acceleration
+        ////////////////////////////////////////////////////////////////////////////////
+
+
+        ////////////////////////////////////////////////////////////////////////////////
+        // Calculate the total force 
+        //
+
+        // Spring force is a restoring force towards the original user-set breast position.
+        // F = kx
+        const F32 spring_length = position_current_local - position_user_local;
+        const F32 force_spring = -spring_length * behavior_spring;
+
+        // Acceleration is the force that comes from the change in velocity of the torso.
+        // F = ma
+        const F32 force_accel = behavior_gain * (acceleration_joint_local * behavior_mass);
+
+        // Gravity always points downward in world space.
+        // F = mg
+        const LLVector3 gravity_world(0,0,1);
+        const F32 force_gravity = behavior_gain * (toLocal(gravity_world) * behavior_gravity * behavior_mass);
+                
+        // Damping is a restoring force that opposes the current velocity.
+        // F = -kv
+        const F32 force_damping = -behavior_damping * mVelocity_local;
+                
+        // Drag is a force imparted by velocity (intuitively it is similar to wind resistance)
+        // F = .5kv^2
+        const F32 force_drag = .5*behavior_drag*velocity_joint_local*velocity_joint_local*llsgn(velocity_joint_local);
+
+        const F32 force_net = (force_accel + 
+                               force_gravity +
+                               force_spring + 
+                               force_damping + 
+                               force_drag);
+
+        //
+        // End total force
+        ////////////////////////////////////////////////////////////////////////////////
+
+        
+        ////////////////////////////////////////////////////////////////////////////////
+        // Calculate new params
+        //
+
+        // Calculate the new acceleration based on the net force.
+        // a = F/m
+        const F32 acceleration_new_local = force_net / behavior_mass;
+        static const F32 max_acceleration = 10.0f; // magic number, used to be customizable.
+        F32 velocity_new_local = mVelocity_local + acceleration_new_local;
+        velocity_new_local = llclamp(velocity_new_local, 
+                                     -max_acceleration, max_acceleration);
+        
+        // Temporary debugging setting to cause all avatars to move, for profiling purposes.
+        if (physics_test)
+        {
+                velocity_new_local = sin(time*4.0);
+        }
+        // Calculate the new parameters, or remain unchanged if max speed is 0.
+        F32 position_new_local = position_current_local + velocity_new_local*time_delta;
+        if (behavior_maxeffect == 0)
+            position_new_local = position_user_local;
+
+        // Zero out the velocity if the param is being pushed beyond its limits.
+        if ((position_new_local < min_val && velocity_new_local < 0) || 
+            (position_new_local > max_val && velocity_new_local > 0))
+        {
+                velocity_new_local = 0;
+        }
+
+	// Check for NaN values.  A NaN value is detected if the variables doesn't equal itself.  
+	// If NaN, then reset everything.
+	if ((mPosition_local != mPosition_local) ||
+	    (mVelocity_local != mVelocity_local) ||
+	    (position_new_local != position_new_local))
+	{
+		position_new_local = 0;
+		position_current_local = 0;
+		position_user_local = 0;
+		mVelocity_local = 0;
+		mVelocityJoint_local = 0;
+		mAccelerationJoint_local = 0;
+		mPosition_local = 0;
+		mPosition_world = LLVector3(0,0,0);
+	}
+
+        const F32 position_new_local_clamped = llclamp(position_new_local,
+						       min_val,
+						       max_val);
+
+        LLDriverParam *driver_param = dynamic_cast<LLDriverParam *>(mParamDriver);
+        llassert_always(driver_param);
+        if (driver_param)
+        {
+                // If this is one of our "hidden" driver params, then make sure it's
+                // the default value.
+                if ((driver_param->getGroup() != VISUAL_PARAM_GROUP_TWEAKABLE) &&
+                    (driver_param->getGroup() != VISUAL_PARAM_GROUP_TWEAKABLE_NO_TRANSMIT))
+                {
+                        mCharacter->setVisualParamWeight(driver_param,
+                                                         0,
+                                                         FALSE);
+                }
+                for (LLDriverParam::entry_list_t::iterator iter = driver_param->mDriven.begin();
+                     iter != driver_param->mDriven.end();
+                     ++iter)
+                {
+                        LLDrivenEntry &entry = (*iter);
+                        LLViewerVisualParam *driven_param = entry.mParam;
+                        setParamValue(driven_param,position_new_local_clamped);
+                }
+        }
+        
+        //
+        // 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.
+        
+        BOOL update_visuals = FALSE;
+
+        // For non-self, if the avatar is small enough visually, then don't update.
+        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());
+        
+        const BOOL is_self = (dynamic_cast<LLVOAvatarSelf *>(mCharacter) != NULL);
+        if ((pixel_area > area_for_this_setting) || is_self)
+        {
+                const F32 position_diff_local = llabs(mPositionLastUpdate_local-position_new_local_clamped);
+                const F32 min_delta = (1.01f-lod_factor)*0.4f;
+                if (llabs(position_diff_local) > min_delta)
+                {
+                        update_visuals = TRUE;
+                        mPositionLastUpdate_local = position_new_local;
+                }
+        }
+
+        //
+        // End update visual params
+        ////////////////////////////////////////////////////////////////////////////////
+
+        mVelocityJoint_local = velocity_joint_local;
+
+        mVelocity_local = velocity_new_local;
+        mAccelerationJoint_local = acceleration_joint_local;
+        mPosition_local = position_new_local;
+
+        mPosition_world = joint->getWorldPosition();
+        mLastTime = time;
+
+        /*
+          // Write out debugging info into a spreadsheet.
+          if (mFileWrite != NULL && is_self)
+          {
+          fprintf(mFileWrite,"%f\t%f\t%f \t\t%f \t\t%f\t%f\t%f\t \t\t%f\t%f\t%f\t%f\t%f \t\t%f\t%f\t%f\n",
+          position_new_local,
+          velocity_new_local,
+          acceleration_new_local,
+
+          time_delta,
+
+          mPosition_world[0],
+          mPosition_world[1],
+          mPosition_world[2],
+
+          force_net,
+          force_spring,
+          force_accel,
+          force_damping,
+          force_drag,
+
+          spring_length,
+          velocity_joint_local,
+          acceleration_joint_local
+          );
+          }
+        */
+
+        return update_visuals;
+}
+
+// Range of new_value_local is assumed to be [0 , 1] normalized.
+void LLPhysicsMotion::setParamValue(LLViewerVisualParam *param,
+                                    F32 new_value_normalized)
+{
+        const F32 value_min_local = param->getMinWeight();
+        const F32 value_max_local = param->getMaxWeight();
+
+        const F32 new_value_local = value_min_local + (value_max_local-value_min_local) * new_value_normalized;
+
+        mCharacter->setVisualParamWeight(param,
+                                         new_value_local,
+                                         FALSE);
+}