public ShadingState traceFinalGather(ShadingState previous, Ray r, int i)
{
if (previous.getDiffuseDepth() >= maxDiffuseDepth)
{
return(null);
}
IntersectionState istate = previous.getIntersectionState();
scene.trace(r, istate);
return(istate.hit() ? ShadingState.createFinalGatherState(previous, r, i) : null);
}