ShapeMask does not check for shadow points

[skohlbr]

The old robot_self_filter had the capability to check for shadow points (https://github.com/tu-darmstadt-ros-pkg/robot_self_filter/blob/master/src/self_mask.cpp#L417). This can be useful when dealing for filtering reflections and wrong distance measurements. The shape_mask implementation in MoveIt! does not have this capability anymore. Is there any particular reason for this? Would there be interest in re-adding it if somebody worked on this?