Implement PMREM Generator #1000
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Implement a PMREM(Prefiltered, Mipmapped Radiance Environment Map) generator.
Reference: https://learnopengl.com/PBR/IBL/Specular-IBL
Uh, I tested myself and it seems to be correct.
This is a map corresponding to different roughness levels, with prefiltered mipmap levels ranging from 0 to 5.
As a comparison, this is normal mipmap level from 0 to 5.
The original texture has a resolution of 2048x2048, so even at mip level 5, the mipmapped texture remains relatively sharp. In contrast, PMREM exhibits a more gradual reduction in blur intensity across mip levels, and this progression depends solely on the mip level rather than the original texture's dimensions.