precomputed radiance transfer opengl

If not for the sake of learning, maybe the fact that it is still very much used in modern day game engines under the name Light Probes can motivate you. Note that training data can be generated for any other geometric representation by first converting it to a mesh and then applying the above routine. For example, spherical harmonic-projected coefficient vectors can actually be rotated due to its property. Take a look back at the simplified rendering equation. With our method, this correspondence is further reduced as the entire transfer is now just a set of weights.

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