[Gate-users] MESH in GATE

Maxime Chauvin maxime.chauvin at inserm.fr
Fri Feb 9 14:10:33 CET 2018

Dear Maikol,

GATE use the surface described by the mesh file to create a solid. Like you saw with your example it produce a volume with the material you specified.
The GATE class that read the .stl mesh file and creates a solid uses the Geant4 class G4TessellatedSolid. 

In the GATE documentation:
http://wiki.opengatecollaboration.org/index.php/Users_Guide:Defining_a_geometry#How_to_build_a_.22tessellated.22_volume <http://wiki.opengatecollaboration.org/index.php/Users_Guide:Defining_a_geometry#How_to_build_a_.22tessellated.22_volume>

In the Geant4 documentation:
https://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/Detector/Geometry/geomSolids.html#tessellated-solids <https://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/Detector/Geometry/geomSolids.html#tessellated-solids>

Hope this helps,
  Maxime Chauvin

> On 9 Feb 2018, at 10:59, maik sal <mmsalas at gmail.com> wrote:
> Dear Gate-Users 
> Someone knows how GATE interprets the Mesh structures, mainly Mesh structures are a shell, I mean it only represents the surface and inside are empty. Only Volumetric Mesh (3D Mesh) are full inside, then I am not sure if Gate interprets the mesh surface as a boundary and everything inside in an specific material or I have to use Volumetric Mesh (3D Mesh).
> Wikipedia definition:  Volumetric meshes are a polygonal representation of the interior volume of an object. Unlike polygon meshes <https://en.wikipedia.org/wiki/Polygon_mesh>, which represent only the surface as polygons, volumetric meshes also discretize the interior structure of the object
> In some test that I made to mask a source, it looks like GATE interprets the volume inside of the surface as a volume with the specific material that I specified, but if someone knows this with more detail I appreciate your help.
> Best regards
> Maikol
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