message: Reinstate temporarily disabled code.
diff: @@ -513,9 +513,9 @@ export class SceneCompositor {
  private renderBackground(commands: RenderCommands, needComposite: boolean) {
  const cmds = commands.getCommands(RenderPass.Background);
  - // if (0 === cmds.length) {
  - // return;
  - // }
  + if (0 === cmds.length) {
  + return;
  + }
  const fbo = needComposite ? this._fbos.opaqueAndCompositeColor! : this._fbos.opaqueColor!;
  const target = this._target;
  