Gerco Onderwater wrote: > > Hi All, > > Is it possible to use one node to "cut" a piece out of another one? In > Geant it was possible to overwrite one region of space occupied by an > object consisting of a certain material by another one consisting of > another material (the "only" option). In that way it was possible to > create complicated shapes by trimming the edges of simple shapes with > pieces of air, which are then invisible. > > What I am trying to do is to make a drawing of a light guide that is > triangular on one side and circular on the other. The circular end is the > narrow end of a cone; the other end of this cone just circumscribes the > triangle. A TPGON unfortuately doesn't let you set the inner and outer > radii for each point independently, otherwise it would be easy. > Hi Gerco, Yes, with Geant3 it is possible to define overlapping volumes and draw "cut" views of this setup. You can translate your Geant3 geometry into a Root geometry using the tool g2root provided in the distribution kit for most systems. You can visualize this setup in Root with either X3D or OpenGL. Unfortunately getting a high quality print with Postscript is not yet possible. You will have to take a low quality screen dump. > Anybody who knows how to solve this problem? Or is it simply not possible > in Root since it is not an AutoCad clone? > I would be interested to know how many people would be interested to have a real geometry package in the Root framework. I mean a package able to: - model complex objects - with visualisation including - 2-d projections (a la CAD) - 3-d views with cut boxes, etc - real-time graphics - Postscript output - answer the questions - where am I ? - surface intersect Yes, I know that this problem is (may be) solved by detector simulation tools. Rene Brun
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