A Boolean value that determines whether SceneKit should render both front and back faces of a surface. Animatable.
- iOS 8.0+
- macOS 10.8+
- tvOS 9.0+
- watchOS 3.0+
When this property’s value is
false (the default), SceneKit renders a surface using the material from one side. The vertex data and normal vectors in a geometry designate which side of each polygon is to be considered its front face, and the geometry’s orientation with respect to the camera determines which front surfaces are currently visible.
If you change this property’s value to YES, SceneKit renders both the front and back surfaces of every polygon. SceneKit assumes the surface normals a back face to be the negative of the front face’s normal vector.
You can animate changes to this property’s value. See Animating SceneKit Content. Animating this property fades between the results of rendering with each state