public void traceDiffusePhoton(ShadingState previous, Ray r, Color power)
{
if (previous.getDiffuseDepth() >= maxDiffuseDepth)
{
return;
}
IntersectionState istate = previous.getIntersectionState();
scene.trace(r, istate);
if (previous.getIntersectionState().hit())
{
// create a new shading context
ShadingState state = ShadingState.createDiffuseBounceState(previous, r, 0);
shadePhoton(state, power);
}
}