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None Re: Weird auxiliary edges in G4UnionSolid 

Forum: Geometry
Re: None Weird auxiliary edges in G4UnionSolid (Emanuele Leonardi)
Date: 02 May, 2005
From: John Allison <John Allison>

There is nothing to worry about.

a) Tracking is not affected by visualisation. Tracking in Boolean solids is well tested.

b) There are well-known logical and numerical problems associated with Boolean operations on solids. Where two solids share a surface, numerical precision sometimes makes the algorithms re-calculate the constituent polygons. This is what has happened in your case for the left hand union, but, apparently, not for the right hand one. The resulting polygons are, within very small numerical differences, equivalent to the originals. Asking to see auxiliary edges shows the recalculated polygons. Non of this affects tracking because there are no such similar issues.

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