Texture cache would enable texture evaluation only once along the ray. This would work best for the relatively smooth textures - but these appear very often with volume rendering. It would do to expire texture cache quickly, as textures tend to revisit nearby points several times. Make textures vary on rendering level Improve radiosity Greg Ward's radiosity currently produces sucky image quality. Additional color models.
New snapshot includes several color models.
They could be used for phase tracking, as well as generating multilayer images and displacement maps for 2d postprocessing. These are 2d textures that are stuct to polygons. This should be added to the primitives whenever it makes sense. This project is rather easy to do. Not hard but urgent.