Questions tagged [pbrt-v3]
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5 questions
1 vote
0 answers
221 views
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 ...
- 1,462
0 votes
0 answers
57 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): ...
- 107
3 votes
1 answer
103 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 ...
- 133
1 vote
0 answers
71 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 ...
- 111
0 votes
0 answers
94 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)...
- 591