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Fix radiance scaling in SpectralFilm::AddSample

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Matt Pharr 2022-03-15 05:47:58 -07:00
parent db13bdc27d
commit 4f99059725
1 changed files with 8 additions and 1 deletions
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9
src/pbrt/film.h
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@ -414,7 +414,14 @@ class SpectralFilm : public FilmBase {
if (m > maxComponentValue)
L *= maxComponentValue / m;
L = weight * SafeDiv(L, lambda.PDF());
// The CIE_Y_integral factor effectively cancels out the effect of
// the conversion of light sources to use photometric units for
// specification. We then do *not* divide by the PDF in |lambda|
// but take advantage of the fact that we know that it is uniform
// in SampleWavelengths(), the fact that the buckets all have the
// same extend, and can then just average radiance in buckets
// below.
L *= weight * CIE_Y_integral;
DCHECK(InsideExclusive(pFilm, pixelBounds));
Pixel &pixel = pixels[pFilm];