SHLighting testing

Reading this document, http://www.research.scea.com/gdc2003/spherical-harmonic-lighting.pdf, for the 1st time was confusing, but once I started coding what was in the doc it made more sense.
I’m also using https://code.google.com/archive/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ for a little bit of speed up.

I’ve been working on this for a less than a week and still got a lot of work remaining, but would like to show my progress anyway.

My sample scene - normal lighting

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Sample scene - SH lighting tech: diffused unshadowed transfer

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Close up, normal lighting

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Close up, SH lighting: diffused unshadowed transfer

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I hope you can see the shading on the SH lighting images.

To do next:
-shadowed diffuse transfer
-interreflective transfer

Edit: added SH lighting technique for images.

This is awesome! I have tried something similar before. Have you captured the shadows in addition to the diffuse lighting? It is also possible to capture Ambient Occlusion and Color Bleeding.

I have completed the “shadowed diffuse transfer” which is essentially AO and currently working on “diffuse interreflected transfer” which does color bleeding.

I might have some more images in a day or two.

Nice. How is the FPS?

No change in the frame rate. SH is written to vertex color and rendered using DiffVCol technique.

Update - all images using 100 SH samples and rendered using diffVCol
Huge limitation using vertex color, especially if the mesh are not high quality.

normal lighting

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diffused unshadowed transfer

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shadowed diffuse transfer

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diffuse interreflect transfer

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Created a repository - https://github.com/Lumak/Urho3D-1.4-SphericalHarmonicLighting/ if anyone is also interested in this topic.

Thanks a lot Lumak. Using SH as vertex color is quite limited, it looks a lot better if used as multiple light probes: http://blogs.unity3d.com/2011/03/09/light-probes/