William Tracy  wrote in message <47eaee70$1@news.povray.org>:
> A raytracer will go to that pixel, and only render the closest object 
> for that pixel.

Tu find the closest object for a pixel, it is necessary to compute the
intersection of the light ray with all objects in the scene, so raw
ray-tracing will definitely not gain time with that regard. To gain time, it
is necessary to use techniques of elimination, using some sort of
hierarchical bounding boxes for example.

I would not be surprised if modern implementations of OpenGL also had
techniques to prune irrelevant objects.

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