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<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Dear Gate-Users</span>

<br><div class="gmail_extra"><br></div><div class="gmail_extra">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).</div><div class="gmail_extra"><br></div><div class="gmail_extra"><b>Wikipedia definition: 

<span style="color:rgb(34,34,34);font-family:sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Volumetric meshes</span><span style="color:rgb(34,34,34);font-family:sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span>are a polygonal representation of the interior volume of an object. Unlike<span> </span></span><a href="https://en.wikipedia.org/wiki/Polygon_mesh" title="Polygon mesh" style="text-decoration:none;color:rgb(11,0,128);background:none rgb(255,255,255);font-family:sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">polygon meshes</a><span style="color:rgb(34,34,34);font-family:sans-serif;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">, which represent only the surface as polygons, volumetric meshes also discretize the interior structure of the object</span></b>

</div><div class="gmail_extra"><br></div><div class="gmail_extra">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.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Best regards</div><div class="gmail_extra"><br></div><div class="gmail_extra">Maikol</div></div>