code: public void setCullFace(GVRCullFaceEnum cullFace) {
          mCullFace = cullFace;
          NativeRenderPass.setCullFace(getNative(), cullFace.getValue());
      }
docs: Set the {@link GVRCullFaceEnum face} to be culled when rendering this {@link GVRRenderPass pass}
  
  @param cullFace
  {@code GVRCullFaceEnum.Back} Tells Graphics API to discard
  back faces, {@code GVRCullFaceEnum.Front} Tells Graphics API
  to discard front faces, {@code GVRCullFaceEnum.None} Tells
  Graphics API to not discard any face