public void InitIfNecessary()
 {
     if (!_initialized)
     {
         _initialized          = true;
         Parallel3D.gravity    = gravity;
         Parallel3D.allowSleep = allowSleep;
         Parallel3D.warmStart  = warmStart;
         Parallel3D.SetLoggingLevel(LoggingLevel);
         Parallel3D.bodyExportSize = bodyExportSize;
     }
 }