Warp wrote:
> 
>   For surfaces seen directly by the camera it's enough to know the length
> of the ray and the scale of the image map.

Assuming:

- normal perspective camera
- No warps etc. being applied to the image map.

To sum it up - in all cases where you probably are faster using hardware 
accelerated scanline rendering anyway.

Again - if you implement something along these lines that is surely 
interesting from the technical standpoint but the practical use will be 
very limited.

Christoph

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