object mask which is not visible

[smoothumut]

Hi everybody.
I want to use this tool for some models which use bop formatting.
Bop formatting requires object mask and object mask_visib as images
As mask, the system displays the siluethe of the object even some parts of it are invisible(behind some other objects)
As mask_visib, the system displays the visible object to the camera.

mask_visib is ok, but how can I get mask (which displays the whole object as a mask even it is behind another object)
Thanks thanks in advance