message: renderer only needs to detect if itself any child has been modified
diff: @@ -160,15 +160,7 @@ namespace ospray {
  void Renderer::postCommit(RenderContext &ctx)
  {
  - if (child("camera").childrenLastModified() > frameMTime
  - || child("camera").lastModified() > frameMTime
  - || child("lights").childrenLastModified() > frameMTime
  - || lastModified() > frameMTime
  - || child("shadowsEnabled").lastModified() > frameMTime
  - || child("aoSamples").lastModified() > frameMTime
  - || child("spp").lastModified() > frameMTime
  - || child("world").childrenLastModified() > frameMTime)
  - {
  + if (lastModified() > frameMTime || childrenLastModified() > frameMTime) {
  ospFrameBufferClear(
  (OSPFrameBuffer)child("frameBuffer").valueAs<OSPObject>(),
  OSP_FB_COLOR | OSP_FB_ACCUM
  