LLVOTree::LLVOTree(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp):
LLViewerObject(id, pcode, regionp)
{
mSpecies = 0;
mFrameCount = 0;
mWind = mRegionp->mWind.getVelocity(getPositionRegion());
}
BOOL LLVOTree::idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time)
{
const U16 FRAMES_PER_WIND_UPDATE = 20; // How many frames between wind update per tree
const F32 TREE_WIND_SENSITIVITY = 0.005f;
const F32 TREE_TRUNK_STIFFNESS = 0.1f;
if (mDead || !(gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_TREE)))
{
return TRUE;
}
F32 mass_inv;
// For all tree objects, update the trunk bending with the current wind
// Walk sprite list in order away from viewer
if (!(mFrameCount % FRAMES_PER_WIND_UPDATE))
{
// If needed, Get latest wind for this tree
mWind = mRegionp->mWind.getVelocity(getPositionRegion());
}
mFrameCount++;
mass_inv = 1.f/(5.f + mDepth*mBranches*0.2f);
mTrunkVel += (mWind * mass_inv * TREE_WIND_SENSITIVITY); // Pull in direction of wind
mTrunkVel -= (mTrunkBend * mass_inv * TREE_TRUNK_STIFFNESS); // Restoring force in direction of trunk
mTrunkBend += mTrunkVel;
mTrunkVel *= 0.99f; // Add damping
if (mTrunkBend.magVec() > 1.f)
{
mTrunkBend.normVec();
}
if (mTrunkVel.magVec() > 1.f)
{
mTrunkVel.normVec();
}
return TRUE;
}
BOOL LLVOTree::idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time)
{
const U16 FRAMES_PER_WIND_UPDATE = 20; // How many frames between wind update per tree
const F32 TREE_WIND_SENSITIVITY = 0.005f;
const F32 TREE_TRUNK_STIFFNESS = 0.1f;
if (mDead || !(gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_TREE)))
{
return TRUE;
}
//it's cheaper to check if wind is enabled first
if (gLLWindEnabled && gSavedSettings.getBOOL("RenderAnimateTrees"))
{
F32 mass_inv;
// For all tree objects, update the trunk bending with the current wind
// Walk sprite list in order away from viewer
if (!(mFrameCount % FRAMES_PER_WIND_UPDATE))
{
// If needed, Get latest wind for this tree
mWind = mRegionp->mWind.getVelocity(getPositionRegion());
}
mFrameCount++;
mass_inv = 1.f/(5.f + mDepth*mBranches*0.2f);
mTrunkVel += (mWind * mass_inv * TREE_WIND_SENSITIVITY); // Pull in direction of wind
mTrunkVel -= (mTrunkBend * mass_inv * TREE_TRUNK_STIFFNESS); // Restoring force in direction of trunk
mTrunkBend += mTrunkVel;
mTrunkVel *= 0.99f; // Add damping
if (mTrunkBend.length() > 1.f)
{
mTrunkBend.normalize();
}
if (mTrunkVel.length() > 1.f)
{
mTrunkVel.normalize();
}
}
S32 trunk_LOD = 0;
F32 app_angle = getAppAngle()*LLVOTree::sTreeFactor;
for (S32 j = 0; j < 4; j++)
{
if (app_angle > LLVOTree::sLODAngles[j])
{
trunk_LOD = j;
break;
}
}
if (!gLLWindEnabled || !gSavedSettings.getBOOL("RenderAnimateTrees"))
{
if (mReferenceBuffer.isNull())
{
gPipeline.markRebuild(mDrawable, LLDrawable::REBUILD_ALL, TRUE);
}
else if (trunk_LOD != mTrunkLOD)
{
gPipeline.markRebuild(mDrawable, LLDrawable::REBUILD_ALL, FALSE);
}
else
{
// we're not animating but we may *still* need to
// regenerate the mesh if we moved, since position
// and rotation are baked into the mesh.
// *TODO: I don't know what's so special about trees
// that they don't get REBUILD_POSITION automatically
// at a higher level.
const LLVector3 &this_position = getPositionAgent();
if (this_position != mLastPosition)
{
gPipeline.markRebuild(mDrawable, LLDrawable::REBUILD_POSITION);
mLastPosition = this_position;
}
else
{
const LLQuaternion &this_rotation = getRotation();
if (this_rotation != mLastRotation)
{
gPipeline.markRebuild(mDrawable, LLDrawable::REBUILD_POSITION);
mLastRotation = this_rotation;
}
}
}
}
mTrunkLOD = trunk_LOD;
return TRUE;
}
