Cull face flag

include/mujoco/mjvisualize.h

@@ -134,6 +134,7 @@ typedef enum mjtRndFlag_ {        // flags enabling rendering effects
   mjRND_HAZE,                     // haze
   mjRND_SEGMENT,                  // segmentation with random color
   mjRND_IDCOLOR,                  // segmentation with segid color
+  mjRND_CULL_FACE,                // cull backward faces
 
   mjNRNDFLAG                      // number of rendering flags
 } mjtRndFlag;