I am also trying to do this, and this code looks good. But I am getting GeometrySource has no member 'asSIMD3' for the let posValues = geometry.vertices.asSIMD3(ofType: Float.self) line in XCode 15 for Vision OS 1.0. Wondering if this was for an earlier beta of Vision OS or something?

With Xcode 16 Beta on Sonoma (14.5) I show 4 build errors: