Warp wrote:
> 
>   How so?
> 
>   I don't see why mipmapping, and better yet trilinear interpolation
> of image maps could not be implemented in a raytracer. There are a
> couple of twists, but they can be probably solved.

Good luck in doing so.  Note any such technique will have to modify the 
very basic concept of raytracing with additions like ray differentials 
and you will have a hard time making this work efficiently in arbitrary 
cases (i.e. non-standard camera types, reflections/refactions etc.).  In 
the end i doubt this will lead to better results in shorter time (but i 
will be happy to be proven wrong).

Christoph

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