[x3d-public] Deep dive: PlayCanvas has IOR update

[John Carlson]

https://twitter.com/playcanvas/status/1549422233701044226?s=21&t=xnxmncFuwh4ao__lUlKgTw

AFAIK, not really for shape modeling, but one can import FBX, last i
checked.   Very good on textures, material, shaders, and scene hierarchy!
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