new PMREMGenerator()
This class generates a Prefiltered, Mipmapped Radiance Environment Map (PMREM)
from a cubeMap environment texture.
This allows different levels of blur to be quickly accessed based on material roughness.
Unlike a traditional mipmap chain, it only goes down to the LOD_MIN level (above),
and then creates extra even more filtered 'mips' at the same LOD_MIN resolution,
associated with higher roughness levels.
In this way we maintain resolution to smoothly interpolate diffuse lighting while
limiting sampling computation.
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