>  And even when OpenGL is a standard, it's not part of the ANSI C++
standard.
>Adding support for it would make povray platform-dependant.


I think Mesa brings OpenGL to the few platform that do not already have it.

All my questions are related to what I saw from Twister. I think a
progressive
refinement display from openGL with texturing to radiosity after a while of
computation, would clearly be better than multiples tries at quality Q1
trough QR.
But all this is relevant only in an interactive environnement. I understand
clearly that my wishes have no utility if the renderer runs on a render
farm.

>  I have understood that using photon mapping for global illumination is
>pretty inefficient and that the current radiosity method (with the fixes
made
>in uvpov) is a lot more efficient.

    I understand cleary the opposite after reading much publications about
radiosity. Try http://graphics.lcs.mit.edu/~henrik/papers/ to read the
original
photon maps papers. Every monte-carlo radiosity, hierachical, or
hierarchical
with substructuring seems beatten by the photon map technique.

> With photon mapping lots of photons will be shot in vain; they will just
> end somewhere in the scene where they do not affect anything.

I'm not sure to understand you, in photon mapping photons are not
shoot anywhere, they are shot only in a direction of an object, never
in a direction where is nothing.


Thank's for your answer.

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