void LLVOPartGroup::setPixelAreaAndAngle(LLAgent &agent)
{
// mPixelArea is calculated during render
F32 mid_scale = getMidScale();
F32 range = (getRenderPosition()-LLViewerCamera::getInstance()->getOrigin()).length();
if (range < 0.001f || isHUDAttachment()) // range == zero
{
mAppAngle = 180.f;
}
else
{
mAppAngle = (F32) atan2( mid_scale, range) * RAD_TO_DEG;
}
}
void LLVOTree::setPixelAreaAndAngle(LLAgent &agent)
{
LLVector3 center = getPositionAgent();//center of tree.
LLVector3 viewer_pos_agent = gAgentCamera.getCameraPositionAgent();
LLVector3 lookAt = center - viewer_pos_agent;
F32 dist = lookAt.normVec() ;
F32 cos_angle_to_view_dir = lookAt * LLViewerCamera::getInstance()->getXAxis() ;
F32 range = dist - getMinScale()/2;
if (range < F_ALMOST_ZERO || isHUDAttachment()) // range == zero
{
mAppAngle = 180.f;
}
else
{
mAppAngle = (F32) atan2( getMaxScale(), range) * RAD_TO_DEG;
}
F32 max_scale = mBillboardScale * getMaxScale();
F32 area = max_scale * (max_scale*mBillboardRatio);
// Compute pixels per meter at the given range
F32 pixels_per_meter = LLViewerCamera::getInstance()->getViewHeightInPixels() / (tan(LLViewerCamera::getInstance()->getView()) * dist);
mPixelArea = pixels_per_meter * pixels_per_meter * area ;
F32 importance = LLFace::calcImportanceToCamera(cos_angle_to_view_dir, dist) ;
mPixelArea = LLFace::adjustPixelArea(importance, mPixelArea) ;
if (mPixelArea > LLViewerCamera::getInstance()->getScreenPixelArea())
{
mAppAngle = 180.f;
}
#if 0
// mAppAngle is a bit of voodoo;
// use the one calculated LLViewerObject::setPixelAreaAndAngle above
// to avoid LOD miscalculations
mAppAngle = (F32) atan2( max_scale, range) * RAD_TO_DEG;
#endif
}
