Questions tagged [photon-mapping]

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How to count the photons when Photon Mapping

I wrote a rather elegant and compact Photon Mapper in CUDA. But I treat all my photons they same, and ignore their colour. This simplicity has some nice properties: e.g. I can just count them with one ...
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How to update large step probability when exchanging states in Metropolis Sampler?

I want to implement good path guiding for photons for my Vertex Merging integrator. After reading through this 2 papers: Hachisuka T., Jensen H. W.: https://www.ci.i.u-tokyo.ac.jp/~hachisuka/...
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Volumetric Photon Mapping - Grid Rendering Artifacts

I am currently implementing a volumetric progressive photon mapping renderer for cloud data (stored as grid density values). As you can see in the image, I am getting this grid with the indirect in-...
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1answer
163 views

Rendering Equation for photons carrying flux

I am trying to understand the mathematical/physical foundations of photon mapping better. In the forward photon tracing step it is established, that the rays are carrying portions of total power (...
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0answers
81 views

How should I understand path-space measurement equation?

I read the corresponding chapter of PBRT-v3, as well as Veach's thesis which introduced BDPT. However I didn't quite understand why we use the measurement equation. It seems that the measurement ...
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118 views

Explain Radiance Estimate for photon mapping

I'm adding photon mapping to my current raytracer to add indirect lighting. Can someone explain how the radiance estimate works in simple terms and with some simple math? I have read a lot of ...
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1answer
2k views

Caustics: methods to render?

What are the recommended ways to render caustics? I am aware bidirectional path tracing and photon mapping can do this. Could someone give a brief overview of photon mapping and a good resource of ...