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Keywords: Boolean Processor error unknown faces G4SubtractionSolid
Forum: Geometry
Re: Sad For John Allison: how come I get "unknown faces!!" when hollowing out a box? (Blair Smith)
Re: None Re: For John Allison: how come I get "unknown faces!!" when hollowing out a box? (Blair Smith)
Date: 12 May, 2005
From: John Allison <John Allison>

I think a hollow box is a problem because no surface of the subtractor intersects any surface of the subtractee. I think this case is just not anticipated because it is more efficiently handled by placing a daughter inside a mother volume -- the implicit convention (from the first beginnings of GEANT) are that the daughter replaces -- in effect subtracts from -- the mother space.

I agree a more sensible error message should be issued.

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