Sorry LD, Maybe I was wrong as I just noticed that the P5 intro screen does state that some of Pixels Digital Inc. rendering technology was used in Firefly. * If third party technology was brought in it must have been very late in the day * I did say that though ;) All you really need for volumetrics is the material description (which is present in the shader tree) and a renderer that can represent it. In the light of the above, this makes it even stranger that Firefly cannot do the job. Bill