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CloseReturns spherical harmonics coefficients of a light probe at the given position. The light probe is interpolated from the light probes baked.
For the scene. The coefficients represent a 3-band RGB spherical harmonics probe, with a total of 27 floats laid out: rgbrgbrgb... Renderer is only needed to speed up the search for the current tetrahedron, as it caches the index of the tetrahedron it was in the last frame.