set background(rawColor) {
      backgroundColor = tinycolor(rawColor);
      let c = backgroundColor.toRgb();
      scene.setClearColor(c.r/0xff, c.g/0xff, c.b/0xff, c.a);
      scene.renderFrame();
      bus.fire('background-color', backgroundColor);
      sceneAPI.fire('background-color', backgroundColor);
    }
Sets the background color of the scene