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Questions tagged [pbrt-v3]

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1 vote
0 answers
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Questions about equi-angular sampling

Equiangular sampling is a sampling method for point (sphere) emitter in scattering medium. While it claims to be very efficient when dealing with point (sphere) emitter in scattering medium (see this ...
Enigmatisms's user avatar
0 votes
0 answers
36 views

Why RGB value bigger than 1 when convert from spectrum in PBRT-V3

In PBRT-V3, the light has following spectrum in scene file(Note that the scene file is not come from PBRT itself): ...
Chris Guo's user avatar
3 votes
1 answer
67 views

Plotting pbrt-v3 Gaussian filter

I want to plot the Gaussian filter of pbrt-v4 with a radius $(100,100)$ and a standard deviation ($\sigma$) of $0.5$. I would expect something like this: When I plot the pbrt-v4 Gaussian filter with ...
Vertexwahn's user avatar
1 vote
0 answers
48 views

Why is there a T factor in the definition of Shah given in Matt Pharr's Physically Based Rendering?

The specific chapter about this is here - Sampling Theory Unlike what I read anywhere else, it defines Shah as: $$Ш_T(x)=T\sum\nolimits_i{\delta{(x-Ti)}}$$ And the T is still present in the ...
Eugene's user avatar
  • 111
0 votes
0 answers
62 views

An equation about PDFs and differentials in the book of pbrt-v3

Why does the equation at the bottom of the following page hold? http://www.pbr-book.org/3ed-2018/Monte_Carlo_Integration/Transforming_between_Distributions.html $p(\theta,\phi)d\theta d\phi=p(\omega)...
chaosink's user avatar
  • 591