InternalCleans up resources used by this PickManager.
Initializes this PickManager, allocating necessary resources. If initialization fails, an error result is returned.
Picks a ViewObject and/or a 3D position on its surface, given either canvas coordinates or a World-space ray.
Releases the splat pick technique while the context is lost, so its
gl.delete* calls are no-ops rather than errors against the restored
context. webglContextRestored rebuilds it.
Manages picking of objects within a WebGLRenderer.
Owned by a ViewManager.