code: @Override
      public void setCursorDepth(float depth)
      {
          super.setCursorDepth(depth);
          if (mRayModel != null)
          {
              mRayModel.getTransform().setScaleZ(mCursorDepth);
          }
      }
docs: Set the depth of the cursor.
  This is the length of the ray from the origin
  to the cursor.
  @param depth default cursor depth