void LLVOTree::setPixelAreaAndAngle(LLAgent &agent)
{
// First calculate values as for any other object (for mAppAngle)
LLViewerObject::setPixelAreaAndAngle(agent);
// Re-calculate mPixelArea accurately
// This should be the camera's center, as soon as we move to all region-local.
LLVector3 relative_position = getPositionAgent() - agent.getCameraPositionAgent();
F32 range = relative_position.length(); // ugh, square root
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()) * range);
mPixelArea = (pixels_per_meter) * (pixels_per_meter) * area;
#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
}
void LLVOTree::setPixelAreaAndAngle(LLAgent &agent)
{
LLVector3 center = getPositionAgent();//center of tree.
LLVector3 viewer_pos_agent = gAgent.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) // range == zero
{
range = 0;
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
}
