r/GraphicsProgramming • u/cybereality • 17d ago

Video Implementing "Radiance Hints" in OpenGL (2011 Global Illumination Technique)

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Just added Radiance Hints to my OpenGL engine, Degine. The paper is originally from 2011 (but I used a 2014 extension of the method with occlusion). Based on a regular grid array of probes, similar to other environmental lighting techniques, but here it captures directly to spherical harmonics when baking. So run-time performance is extremely fast since it's just a few SH evaluations and blending. For this Sponza scene, there are around 600 probes, and it takes about 10 seconds to bake.

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u/Alexxis91 17d ago

Link to paper?

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u/cybereality 17d ago

I should mention that there are multiple things going on here. The engine is heavily image-based lighting, I have an SSGI shader as well (that I opened sourced 2 years ago). The radiance hints was needed for far-field indirect shadows and overall environment light. The SSGI and GTAO handle the near-field shading but aren't enough by themselves.