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> contrast range should be handled pretty
> realistically by the HDR
It's still a question of mine. According to the docs, POV uses a limited
reflection formula that clips values above 1.. I don't know if this was
changed in MLPOV but I suppose not. If the problem was trivial, it would
probably already have been solved in the offical POV.
Radiosity supports the HDR range, yes, but reflection?
Maybe you can test it...
Regards,
Hugo
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Hmm, I've not heard of that restriction, but it's pretty easy to test...
...I did a test with 3 spheres with different reflection values, and the camera
inside a black sphere with transmit 0.1. The reflections showed all of the
details on the HDR image, with no flattening of colours until they hit full
white. So I can't find any limitation on the brightness of reflections:
That was using ML pov, but the same test scene replaced with a very brightly
coloured sky (rgb 20) in standard POV 3.5 also showed no capping of reflections.
--
Tek
http://www.evilsuperbrain.com
"Hugo Asm" <hua### [at] post3 teledk> wrote in message
news:3ed0ff89@news.povray.org...
> > contrast range should be handled pretty
> > realistically by the HDR
>
> It's still a question of mine. According to the docs, POV uses a limited
> reflection formula that clips values above 1.. I don't know if this was
> changed in MLPOV but I suppose not. If the problem was trivial, it would
> probably already have been solved in the offical POV.
>
> Radiosity supports the HDR range, yes, but reflection?
> Maybe you can test it...
>
> Regards,
> Hugo
>
>
Post a reply to this message
Attachments:
Download 'hdr.jpg' (11 KB)
Preview of image 'hdr.jpg'
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> That was using ML pov, but the same test scene replaced with
> a very brightly coloured sky (rgb 20) in standard POV 3.5 also
> showed no capping of reflections.
Thank you. I did a quick experiment on my own, and you're right. The docs
have confused me. It says the reflection_exponent keyword compensates for "a
limited light model that cannot distinguish between objects which are simply
brightly colored and objects which are extremely bright."
Reading the following sentence closely, it says "A white piece of paper, a
light bulb, the sun, and a supernova, all would be modeled as rgb<1,1,1> and
slightly off-white objects would be only slightly darker." But who on earth
would model a supernova as <1,1,1> ?? So in fact, it's not POV-Ray that
uses a limited light model, it's a USER who doesn't distinguish between
objects which are simply brightly colored, and objects which are extremely
bright.
Regards,
Hugo
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