attempting to display the example project in the vision pro simulator window [Xcode Version 15.2] but many of the defined shapes do not display. Could be related to the other issue on shapes not displaying in this issue. Or it could be that the example project isn't set up for the Vision simulator. Looks awesome though, thanks!

There is no easy way to create half a sphere (hemisphere) now in RealityKit.

I want to render a smooth Torus -but it looks like it is only possible to create 30-40 sides.

This works - but gives corners (see attached image):

let torus = ModelEntity(mesh: try! .generateTorus(sides: 30, csSides: 3, radius: 3.99, csRadius: 0.03), materials: [SimpleMaterial(color: .blue, isMetallic: false)])

Is there an upper limit of the number of sides that is resource constrained by the hard ware?

This is impressive!
You said that you were open to feature requests, so I hope this will be OK to suggest:
It would be great to have a tetrahedron primitive. Even better would be per Vertex colors…
And, blue sky dreaming, a 10-nosed tet with side nodes (vertices) giving quadratic sides to the tetrahedron edges, with many such tetrahedrons (for example finite element visualization).

When I put a image as texture, it's mirrored, the "b" becomes "d". It happens in Cone, Cylinder, Torus. But Cone and Cylinder bottom are right, and DetailPlane is right.

then I use ModelDebugOptionsComponent(visualizationMode: .textureCoordinates) to check uv, I find It's different to uv in Shaders.

I think this is the problem: RealityKit mirror y-axis of uv in some step.
In Mesh of a Plane, the uv origin is at left-bottom corner, y-up to top. (use Shader to visualize uv)
When put image to a Plane, the uv origin is at left-top corner, y-up to bottom, just like UIKit. (use ModelDebugOptionsComponent(visualizationMode: .textureCoordinates) to visualize uv)

Maybe we should change uv in Mesh to match image. But I don't know is it the Right way ?

Hello 👋🏻

I am trying to build a sort of circle arc, or torus section, using the provided line and tube methods. Here is my sample code:

func points(of radius: Float, from start: Angle2D, to end: Angle2D) -> [SIMD3<Float>] {
    let degrees = Int(abs(start.degrees - end.degrees))
        
    var points = [SIMD3<Float>]()
        
    for i in 0...degrees {
        let angle = Angle2D(degrees: Double(i)).radians
            
        let x = Float(radius * cos(angle))
        let y = Float(radius * sin(angle))
            
        points.append([x, 0, y])
    }
        
    return points
 }

let points = points(of: radius, from: .zero, to: .radians(.pi / 2))
        
guard let mesh = try? RealityGeometry.line(points: points, radius: 1).0 else { return nil }
        
let entity = ModelEntity(mesh: mesh, materials: [PhysicallyBasedMaterial.glassMaterial])

The code runs with no errors and manages to go over the guard line. However, using line or generateTube does not produce any visible entity. Interesting fact: using generatePath with the same points does produce the correct mesh, but path is flat and I need a proper 3D tube-like object.

BTW thank you for this package, it's helping me a lot with my non-existent 3D development skills.