message: Fix volume visibility toggle by only putting visible nodes in groups
diff: @@ -375,6 +375,9 @@ namespace ospray {
  void* volHandle = reinterpret_cast<void *>(vol.handle());
  + if (volNode->child("visible").valueAs<bool>() == false)
  + return;
  +
  if (groups.find(volHandle) != groups.end())
  return;
  