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Forum: Geometry
Re: Question "T" form Tube (Leonardo Ghizoni)
Date: 28 Aug, 2013
From: John Apostolakis <John Apostolakis>

Dear Leonardo,

Please look at the Root forums for help with this issue - they are more 
qualified to advise if you intend to build a geometry that way and then 
port it to Geant4.

For a complicated shape as the one you appear to be building, I would 
suggest a different approach to your boolean operation.

Instead of using the constructs
A - B - C - D
I suggest to make a Union of B, C and D and then subtract that from A:

A - ( B U C U D )  - where 'U' is Union.

I also note that in Geant4 the visualiation of Boolean volumes is 
tricky. The most robust option to use the ray Tracing viewers, which 
show you the view of the Geometry as the Navigator sees it. This is 
slower than the 'simple' visualisation, but for complicated shapes, such 
as this, it is much more reliable. For further suggestins please look in 
our applications developers guide, and conslut the responses to queries 
about this topic in the User Forum area for visualisation.

Regards,
John

On 8/27/13 3:54 PM, Leonardo Ghizoni wrote:
> *** Discussion title: Geometry
>
> Hello,
>
> I'm trying to build a tube in a "T" form, but getting some problems...
>
> First, I'm trying to build it on ROOT (its faster to compile), but not
> sure if I'm getting it right.
>
> Here's what I'm trying to do:
>
>    TGeoBBox *Tube1 = new TGeoTube("Tube1",Inner_radius,Tube_radius,dim_X1);
>    TGeoBBox *Tube2 = new TGeoTube("Tube2",Inner_radius,Tube_radius,dim_X1/2);
>    TGeoBBox *Tube3 = new TGeoTube("Tube3",0,Inner_radius,dim_X1);
>    TGeoBBox *Tube4 = new TGeoTube("Tube4",0,Inner_radius,dim_X1/2);
>
>    TGeoRotation *r1 = new TGeoRotation("r1",0,90,0);
>    r1->RegisterYourself();
>    TGeoTranslation *t1 = new TGeoTranslation(0.,0.,dim_X1/2);
>    t1->SetName("t1");
>    t1->RegisterYourself();
>
>    TGeoCompositeShape *Cs = new TGeoCompositeShape("Cs","(Tube1:r1+Tube2:t1)-(Tube1:r1*Tube3:r1)-(Tube2:t1*Tube4:t1)-(Tube3:r1+Tube4:t1)");
>    TGeoVolume *comp = new TGeoVolume("COMP",Cs);
>    comp->SetLineColor(kBlue);
>    top->AddNode(comp,1);
>
> The problem is that I cannot visualize it with OpenGL, and don't for
> sure what's the result.
>
> Could someone help me, if possible??
>
> Thanks in advance.
>
> Leonardo.
>
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> Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at:
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1 None: Re: "T" form Tube   (Leonardo Ghizoni - 24 Mar, 2014)
(_ None: Re: "T" form Tube   (John Apostolakis - 25 Mar, 2014)
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