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Question Making holes in volumes 

Forum: Geometry
Date: 05 Nov, 2013
From: Marek Szuba <Marek Szuba>

Hello again,

There are a few volumes in my geometry which have got holes in them. So far I have had them implemented the GEANT3 way, i.e. by creating subvolumes filled with the same material as the surroundings; a quick search of these forums shows that at least as far as performance is concerned, this is still considered to be the best approach. There are, however, two things I would like to clarify:

1. Section 4.1.2.2 of the Geant Application-Developer Guide (which discusses solids made by Boolean operations) mentions the following: "The constituent solids of a Boolean operation should possibly avoid be composed by sharing all or part of their surfaces. This precaution is necessary in order to avoid the generation of 'fake' surfaces due to precision loss, or errors in the final visualization of the Boolean shape.". Given holes implemented through subvolumes share parts of their surfaces with respective mother volumes, don't they suffer from the same problem? I do occasionally see some visualisation artefacts there;

2. Is there some way of making holes implemented this way truly see-through in Geant visualisation? This is of course purely cosmetic because as far as particle transport is concerned it is the material that counts - but it would come in handy at times. So far I've only tried adjusting transparency of daughter volumes but alas, all it does is make them disappear from the mother.

Any hints will be very much appreciated!

--

MS

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1 None: Re: Making holes in volumes   (Michael H. Kelsey - 05 Nov, 2013)
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