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None Defining solid with polynomial surface 

Forum: Geometry
Date: 30 Mar, 2008
From: Kay Ulbrich <Kay Ulbrich>


I am using GEANT4 for optical simulations and am wondering, how to define solids with complex surfaces, i.e., blocks with a polynomial or cylindrical profile (limited angular range of the cylinder).

With Boolean solids, a cylindrical profile principally can be achieved by using a G4Tubs with the needed angular range and then subtracting parts of it using a G4Box in order ro remove the "wedge". But when then adding i.e. a G4Box again to the resulting solid, I get vizualization problems. I want to have the solid in one in order to avoid unnessecary surfaces, which would ensue from making up the structure of several logical volumes.

For a polynomial profile I think, there are no pre-defined solids.

So it seems, I would have to define my own BREP solids, starting with deriving curves from G4Curve (for cylindrical profiles I think, one could use G4Ellipse), building surfaces from them and connecting them. I would like to do that in source code, not using a CAD program, and cannot find documentation, except for the source code of i.e. G4Line, so I am not sure as to how to properly derive from G4Curve, i.e., which virtual functions do have to be implemented for the tracking and visualization. Is there somewhere a guide or documentation as to how to construct one's own BREP solids using G4Curve and G4Surface?

I would be very grateful for related hints


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1 None: Re: Defining solid with polynomial surface   (John Allison - 30 Mar, 2008)
(_ None: Re: Defining solid with polynomial surface   (Kay Ulbrich - 31 Mar, 2008)
(_ More: Re: Defining solid with polynomial surface   (Gabriele Cosmo - 01 Apr, 2008)
(_ None: Re: Defining solid with polynomial surface   (Kay Ulbrich - 18 Apr, 2008)
(_ Feedback: Re: Defining solid with polynomial surface   (Gabriele Cosmo - 18 Apr, 2008)
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