Added envelop volume

compact/ce_GEM.xml

+<lccdd>
+
+  <comment> Electron endcap GEM tracking </comment>        
+
+  <define>
+  </define>
+
+  <limits>
+  </limits>
+
+  <regions>
+  </regions>
+
+  <display>
+  </display>
+
+  <detectors>
+    <detector id="ce_GEM_ID" name="ce_GEM" type="ce_GEM" readout="ce_GEM_Hits" vis="ce_GEMVis" insideTrackingVloume="true">
+      <dimensions rmin="ce_GEM_rmin" rmax="ce_GEM_rmax" length="ce_GEM_length"/>
+      <position x="ce_GEM_x_pos" y="ce_GEM_y_pos" z="ce_GEM_z_pos"/>
+      <layer repeat="ce_GEM_layer" vis="ce_GEM_layerVis">
+        <slice name="Ar10C02_slice" material="Ar10CO2" sensitive="true"/>
+      </layer>
+    </detector>
+  </detectors>
+
+  <readouts>
+    <readout name="ce_GEM_Hits">
+      <segmentation type="CartesianGridXY" grid_size_x="1.0*mm" grid_size_y="1.0*mm" />
+      <id>system:8,layer:8,x:32:-16,y:-16</id>  
+    </readout>
+  </readouts>
+
+  <plugins>
+  </plugins>
+
+  <fields>
+  </fields>
+</lccdd>

compact/definitions.xml

@@ -130,7 +130,7 @@
     ===================
 
     Unused IDs: 75-99 
-    TBD 
+    TBD
     </comment>
 
     <comment> 
@@ -189,10 +189,12 @@
       =====================================
 
       Modular RICH ID: 130
-      Unused IDs: 131-139
+      Electron Endcap GEM tracking ID: 131
+      Unused IDs: 132-139
 
     </comment>
     <constant name="ce_MRICH_ID"        value="130"/>
+    <constant name="ce_GEM_ID"          value="131"/>
 
     <comment> 
       =====================================
@@ -531,8 +533,18 @@
     <constant name="ce_MRICHLength" value="15*cm"/>
     <constant name="ce_MRICHZMin" value="-EcalEndcap_zmin+10.*cm"/>
 
-
-
+    <comment>
+      ------------------
+      ce_GEM Parameters
+      ------------------
+    </comment>
+    <constant name="ce_GEM_rmin"   value="0.0 * cm"/>
+    <constant name="ce_GEM_rmax"   value="45.0 * cm + 50.0 * cm"/>
+    <constant name="ce_GEM_length" value="30.0 * cm"/>
+    <constant name="ce_GEM_x_pos"  value="0.0 * cm"/>
+    <constant name="ce_GEM_y_pos"  value="0.0 * cm"/>
+    <constant name="ce_GEM_z_pos"  value="-SolenoidLength/2.0 + ce_GEM_length/2.0"/>
+    <constant name="ce_GEM_layer"  value="8"/>
 
   </define>
 

compact/display.xml

@@ -53,6 +53,7 @@
     <vis name="ffi_ZDCmoduleVis"   alpha="1.0"  r= "0.1"  g="1.0"  b="0.9"  showDaughters="true" visible="true"/>
     <vis name="cb_CTDVis"          alpha="0.1"  r= "0.1"  g="0.0"  b="1.0"  showDaughters="true" visible="true"/>
     <vis name="cb_CTD_Si_layerVis" alpha="1.0"  r= "0.9"  g="1.0"  b="0.1"  showDaughters="true" visible="true"/>
+    <vis name="ce_GEMVis"          alpha="0.1"  r= "0.1"  g="0.0"  b="1.0"  showDaughters="true" visible="true"/>
 
     <comment>
       Deprecated colors.

compact/materials.xml

@@ -186,4 +186,12 @@
     <composite n="4" ref="O"/>
   </material>
 
+  <material name="Ar10CO2">
+    <D type="density" value="1.802" unit="mg / cm3"/>
+    <composite n="0.891" ref="Argon"/>
+    <!--<composite n="0.109" ref="CarbonDioxide"/>-->
+    <composite n="0.036" ref="C"/>	    
+    <composite n="0.073" ref="O"/>	    
+  </material>
+
 </materials>

reference_detector.xml

@@ -114,6 +114,7 @@
   <include ref="reference_detector/vertex_tracker.xml"/>
   <include ref="compact/silicon_tracker.xml"/>
   -->
+  <!--
   <include ref="compact/cb_CTD_Si.xml"/>
   <include ref="ip6/beampipe.xml"/>
   <include ref="compact/ffi_ZDC.xml"/>
@@ -122,11 +123,15 @@
   <include ref="compact/hcal.xml"/>
   <include ref="compact/forward_rich.xml"/>
   <include ref="compact/ce_mrich.xml"/>
-  <!--
-  <include ref="compact/roman_pots.xml"/>
   -->
-  <include ref="eic/forward_ion_beamline.xml"/>
+  <include ref="compact/ce_GEM.xml"/>
+	  <!--
+  <include ref="compact/roman_pots.xml"/>
+	  -->
   <!--
+  <include ref="eic/forward_ion_beamline.xml"/>
+  -->
+	  <!--
   -->
 
   <detectors>

src/ce_GEM.cpp

+#include <XML/Helper.h>
+//////////////////////////////////
+// Electron Endcap GEM Tracking
+//////////////////////////////////
+
+using namespace std;
+using namespace dd4hep;
+
+static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens)
+{
+  xml_det_t  x_det      = e;
+  string     detName    = x_det.nameStr();
+  int        detID      = x_det.id();
+
+  xml_dim_t  dim        = x_det.dimensions();
+  double     RIn        = dim.rmin();
+  double     ROut       = dim.rmax();
+  double     SizeZ      = dim.length();
+  xml_dim_t  pos        = x_det.position();
+
+  Material   Vacuum     = desc.material("Vacuum");
+
+  // Create Global Volume 
+  Tube ce_GEM_GVol_Solid(RIn, ROut, SizeZ / 2.0, 0., 360.0 * deg);
+  Volume detVol("ce_GEM_GVol_Logic", ce_GEM_GVol_Solid, Vacuum);
+  detVol.setVisAttributes(desc.visAttributes(x_det.visStr()));
+
+  // Construct Layers
+  xml_comp_t x_layer = x_det.child(_U(layer));
+  const int repeat   = x_layer.repeat();
+  
+  xml_comp_t x_slice = x_layer.child(_U(slice));
+  Material slice_mat = desc.material(x_slice.materialStr());
+  
+  // Loop over layers
+  //for(int i = 0; i < repeat; i++) {
+  //  layerRIn[i]  = RIn + (SiLayerGap * i);
+  //  layerROut[i] = RIn + (0.01 + SiLayerGap * i);
+
+  //  if (layerROut[i] > ROut)
+  //    continue; 
+
+  //  string logic_layer_name = detName + _toString(i, "_Logic_lay_%d");
+  //  Volume layerVol(logic_layer_name,Tube(layerRIn[i], layerROut[i], SizeZ / 2.0, 0.0, 360.0 * deg), slice_mat);
+  //  layerVol.setVisAttributes(desc,x_layer.visStr());
+  //  sens.setType("tracker");
+  //  layerVol.setSensitiveDetector(sens);
+
+  //  Position     layer_pos = Position(0.0, 0.0, 0.0);
+  //  PlacedVolume layerPV = detVol.placeVolume(layerVol, layer_pos);
+  //  layerPV.addPhysVolID("layer", i+1);
+  //}
+
+  DetElement   det(detName, detID);
+  Volume       motherVol = desc.pickMotherVolume(det);
+  Transform3D  tr(RotationZYX(0.0, 0.0, 0.0), Position(pos.x(), pos.y(), pos.z()));
+  PlacedVolume detPV = motherVol.placeVolume(detVol, tr);
+  detPV.addPhysVolID("system", detID);
+  det.setPlacement(detPV);
+  return det;
+}
+
+DECLARE_DETELEMENT(ce_GEM, createDetector)