> With this SDL, you can then define what "sphere" means but this time it's 
> written in the SDL language, not in C.  You can define what marble means. 
> You can define what fog means.  All of these definitions become part of 
> the SDL and are included in a library which people can use.

Your idea sounds good in theory.  In fact I would also like to see all the 
lighting code removed, to be replaced by standard SDL libraries for 
diffuse/specular etc.  The user is then free to implement their own lighting 
models should they wish.

I suppose the SDL would also need to be extended so that users could specify 
the ray/shape intersection algorithm - otherwise it's going to be like 
making everything out of isosurfaces...

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