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I have some 3d objects from gsm file.
I can't get the wanted area by ACAPI_Element_GetSurfaceQuantities
and ACAPI_Element_GetQuantities function.

Is there any way to get the projected area on the floor plan?
The attachment is my demostration.
the floor plan:
Snipaste_2020-01-16_15-46-50.png (11.7 KiB) Viewed 651 times

the 3D: