WC's not talking about caustics....WC's talking about light color transmission (how a colored glass imparts its color to the light that comes out the other side such as a stained glass window will shine colors on a wall rather than just the outline in white light), which Poser can only "fake" with a gather node but can't do natively....kinda like it can't do caustics. LOL. If you're not talking about either of those WC I have no idea what ya mean. LOL

Laurie