@sjb3d@mastodon.gamedev.place
Graphics/systems programmer. Previously at Unity, Media Molecule (Dreams), Sony ATG. Interested in tracing rays, distance fields, Vulkan, Rust/Zig and generally keeping GPUs running efficiently. Opinions my own.
np this stuff is confusing. The reason why the "writing" function has an extra factor is because it's doing two things at once:
- Convert incoming light to SH (which for a directional light means you evaluate for the light direction).
- Then convert that SH into the SH for the response of a diffuse surface of a given normal (so later you read the SH using some normal direction). In SH this can be done by multiplying each band by a specific constant.
if you're storing the diffuse response to a directional light in SH, then I think all the odd bands apart from band 1 are zeros. So for SH_AddLightDirectional in your first link, the next 7 coefficients would be zeros! (There is a derivation of this in "An Efficient Representation for Irradiance Environment Maps" at eqn 8.)
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