message: Use sg::Framebuffer for clearing
diff: @@ -78,10 +78,7 @@ namespace ospray {
  void Frame::postCommit(RenderContext &)
  {
  if (clearFB) {
  - ospFrameBufferClear(
  - child("frameBuffer").valueAs<OSPFrameBuffer>(),
  - OSP_FB_COLOR | OSP_FB_ACCUM
  - );
  + child("frameBuffer").nodeAs<FrameBuffer>()->clear();
  clearFB = false;
  numAccumulatedFrames = 0;
  