[Cg1] AreaLight

Gereon Fox s9gefoxx at stud.uni-saarland.de
Wed Jan 7 18:05:46 CET 2015

Discussing the issue with a fellow student, I realised that I had
forgotten to mention the following: Before we apply said division, we
clamp the radiance we got from the texture. This is what makes our
approach especially suspicious, because the texture's radiance of 25.f
seems to have been chosen carefully and we just discard every
information beyond 1.f through the clamp...

Am 06.01.2015 um 01:47 schrieb Gereon Fox:
> Hi,
> we are having some trouble with the AreaLight: The constant
> texture/material attached to it in the sample scene emits a radiance of
> 25.0. Obviously, simply returning this radiance in
> AreaLight::getIntensity makes the scene much too bright. That is why we
> tried to follow all the clues we could find and divided that radicane by
> the (sparsely convincing) divisor pi * irr.distance^2. This made our
> images look quite similar to the samples, but the bright half-circle on
> the white back wall is now a little too small (see attachment).
> What are we doing wrong here?
> Regards,
> Gereon.

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