Depth Occlusion + VideoNode + Optimized Plane rendering

• Depth Occlusion Rendering (#84):
  • To enable it:
    • arSceneView.getCameraStream().setDepthOcclusionMode(CameraStream.DepthOcclusionMode.DEPTH_OCCLUSION_ENABLED);
    • if (session.isDepthModeSupported(Config.DepthMode.AUTOMATIC)) {config.setDepthMode(Config.DepthMode.AUTOMATIC);}
  • Even when Depth is supported the user can disable the occlusion material
  • Added Depth usage for the gltf samples app
• Added VideoNode and updated video-texture sample. (#83):
  • Added VideoNode and updated videotexture sample accordingly.
  • Added option to pass own ExternalTexture to VideoNode.
• Optimized the Plane rendering (#78):
  • Prevents unnecessary calls to calculate the focusPoint and modify the planeMaterial.
  • Added a new enum PlaneRendererMode to render all detected planes or only the top most.
    • Choose RENDER_ALL to get the old behaviour. Everything what is visible to the user is rendered.
    • Choose RENDER_TOP_MOST to render only the top most plane.
  • Don't call the update function of the PlaneRenderable if it is not enabled.
  • Added arFragment.getArSceneView().getPlaneRenderer().setEnabled(false);
• Fixed RenderableInstance getMaterial()