Severi Salminen wrote:
> Alain wrote:
> 
>> All ray tracers go from the camera to the objects in the scene then to
>> the light source(s). It's called backward ray tracing. Much more
>> effecient that way.
> 
> Actually, many raytracers do a hybrid: they start simultaneously from
> camera AND lightsource. At least bidirectional path tracing works like
> that. They then connect the paths somewhere in between. That seems very
> promising technique.

I saw one that starts from the light sources (which are high-ambient
objects) bouncing rays around. When the rays hit objects, the "hits" are
saved in a buffer. When the buffer gets full, it does a normal backwards
raytracing (from the camera), collecting the buffered hits near the
intersection point of the bw-raytracing ray. Then the buffer is emptied and
process repeats.

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