message: add ability to turn off ground plane with environment variable
diff: @@ -45,10 +45,19 @@ struct clFile
  clTransform transform;
  };
  +inline bool groundPlaneDefaultFromEnv()
  +{
  + auto env = getEnvVar<int>("OSPRAY_VIEWER_GROUND_PLANE");
  + if (!env.first)
  + return true;
  + else
  + return env.second;
  +}
  +
  std::vector<clFile> files;
  std::vector< std::vector<clFile> > animatedFiles;
  std::string initialRendererType;
  -bool addPlane = true;
  +bool addPlane = groundPlaneDefaultFromEnv();
  bool debug = false;
  bool fullscreen = false;
  bool print = false;
  