Mael wrote:
> 
> Nice images.

Thanks.

> I think it's probably possible to improve povray radiosity for
> the special case of image lighting (for instance by not using evenly spread
> samples, but sending more samples rays towards high intensity area of the
> image)

I already thought of this before but there are a few problems:

- you probably spend quite some time determining which areas are high
intensity at a certain place in the scene.

- you need to weight the samples rays differently to get comparable
results if you have a non uniform distribution.

The first problem could be partly solved by assuming the lighting
situation is the same at all places of the scene.  This should not be a
problem if the sample rays are correctly weighted and the HDR map is far
enough away.  But i'm not sure if it has much advantage then since the
critical areas are always those where the lighting situation is different
because of the scene geometry.

Something else that could be interesting would be 'image based photon
mapping' meaning that you don't send photons from light sources but from
the HDR map.  I'm not sure if that's feasible but it is an interesting
concept i think.

Christoph

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