"Grassblade" <nomail@nomail> wrote:
> I used the SDL raytracer found in the help file
> (http://www.povray.org/documentation/view/3.6.1/123/) to refine an idea
> more or less suggested by Bruno Cabasson.
> Top picture skips a ray if (square of) distance in colour-space is smaller
> than an user supplied threshold.
> Middle pic is the result of the unadulterated SDL raytracer.
> Bottom pic is the difference of the two.
> The supplied Skip-a-ray pic requires about 65-70% of the time to render.

The fact is  that, basically and in principle, you can't predict whether or
not an object happens to occlude another at the next pixel or next ray. My
suggestion was about the fact that in ALREADY RENDERED images, entire areas



It appears now that the answer is no.

But I am still wondering if a first 'geometrical' pass at render-time could
help collect data (like direction-object correspondance) that could be used
FOR SUBSEQUENT RENDERS and save ray-object intersection tests and

assumptions about ray-object intersectons. This is not very applicable for
anims, of course.

Bruno.

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