Hey, OcclusionMaterial is indeed the way to go! For a working VisionOS example, take a look at this project: https://github.com/qvik/helsinkios-visionos-portals
matti777
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I am seeing the same exact error using Xcode 15.3. / VisionOS 1.1 simulator.
Oh and this is in a RealityView attachment view, not a window.