Is IBL compression causing blowout?

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hey @amontville_lil. @Mr_F

compared to Sketchfab, two differences there in my watching…

  1. the top-left sphere -> less chrome than the right ones, because the mipmap problem implemented in ‘reflectionPrefilteredCube.frag’ and I tried to use the ‘reflectionPrefilteredCubeLod.frag’ and then it looks better…

  2. the right-top sphere looks more darker in sketchfab and the variations from left to right are more obvious…
    I guess it’s because playcanvas are missing intregrateBRDF part for IBL-Split-Sum (basically just consider the
    prefiltering) Missing IntegrateBRDF part in IBL?