Hi!
The fill origin is controlled by the "coor" command in the 3d script. It is shown in 3d views and sections/elevations.
In GDL manual page 549 "Modeling transparent bodies" and "DOORS AND WINDOWS" page 577 tell basic guidelines.
You can try this command after the 3d script of the glass:
add -a/2+frame_thickness,b-frame_thickness,0
base
vert 0, 0, 0
vert 1, 0, 0
vert 0, 1, 0
vert 0, 0, 1
coor 2 + 256, -1, -2, -3, -4
del 1
The doors and windows are sometimes complex and hard to understand. For example, if You mirror the D/W then the mapping mirrors, too. Maybe in the schedules and facades, it is desirable to have the same mapping orientation regardless of mirroring, especially when using diagonal hatches.
Of course, the mapping should be applied to all elements individually.
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