Build a display-only light gizmo and attach it to the utility layer. The per-light-type geometry is built lazily on the first attachLightGizmoToLight (since the light type isn't known until then).
attachLightGizmoToLight
Build a display-only light gizmo and attach it to the utility layer. The per-light-type geometry is built lazily on the first
attachLightGizmoToLight(since the light type isn't known until then).