code: private boolean onFirstStep() {
          if (!mFirstStepDone) {
              Log.d(TAG, "onFirstStep()");
              mFirstStepDone = true;
              float yaw = getMainCameraRigYaw();
              Log.d(TAG, "Update frontFacingRotation at start: %f", yaw);
              updateFrontFacingRotation(yaw);
  
              // Now we will do our first layout
              mSceneRootWidget.onFirstStep();
  
              return true;
          }
  
          return false;
      }
docs: Calling on first {@link org.gearvrf.GVRMain#onStep} to process first rendering
  @return true if it is first rendering, otherwise - false