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Keywords: G4union boolean
Forum: Geometry
Re: Question Boolean Volumes G4Union (Jean-stephane Ricol)
Date: 31 Oct, 2006
From: John Allison <John Allison>

First, let me say that this is purely a problem of visualisation. The tracking is not affected. For visualisation we attempt to make a polyhedron which is the result of a Boolean operation on two polyhedral representations of the components in a completely separate computation.

Boolean operations on solids is a computationally complex problem and I'm afraid our software is not sufficiently robust. We hope to make progress on this in the future but at present we have no dates for this.

The problem often arises if two solids have faces that are part of the same plane. So a workaround is to change one of the solids. Sometimes, this can be done without logically affecting the outcome at all, for example, the subtracting solid can be made larger, for example, a tube that makes a hole through another solid can be as long as you like. Similarly for intersections. Alternatively, making one of the solids a few microns larger can solve the problem without seriously affecting the physics.

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