Extrude : Examples of Extruded sketches - KeithSloan/GDML GitHub Wiki
GDML Objects can be created by extruding a FreeCAD sketch
When exported the GDML Object will be created from a series of booleans
Comparison Timings
Timing for extruded sketches, exported as Booleans of solids versus being Tessellated
Displayed in Geant4
Booleans from extruded sketch

Same objects Tessellated

Simulation timings
With 10^6 geantinos:
extrusions: 7.25 s
tesselation: 17.35 s
With 10^6 2 MeV gamma rays:
extrusion: 17.35 s
tessellation: 146 s