Added envelope volume

compact/cb_VTX.xml

+<lccdd>
+
+  <comment> Central Barrel Vertex Detector </comment>        
+
+  <define>
+  </define>
+
+  <limits>
+  </limits>
+
+  <regions>
+  </regions>
+
+  <display>
+  </display>
+
+  <detectors>
+    <detector id="cb_VTX_ID" name="cb_VTX" type="cb_VTX" readout="cb_VTX_Hits" vis="cb_VTXVis" insideTrackingVloume="true">
+      <dimensions rmin="cb_VTX_rmin" rmax="cb_VTX_rmax" length="cb_VTX_length"/>
+      <position x="cb_VTX_x_pos" y="cb_VTX_y_pos" z="cb_VTX_z_pos"/>
+    </detector>
+  </detectors>
+
+  <readouts>
+    <readout name="cb_VTX_Hits">
+      <segmentation type="CartesianGridXY" grid_size_x="1.0*mm" grid_size_y="1.0*mm" />
+      <id>system:8,barrel:3,layer:4,x:32:-16,y:-16</id>  
+    </readout>
+  </readouts>
+
+  <plugins>
+  </plugins>
+
+  <fields>
+  </fields>
+</lccdd>

compact/definitions.xml

@@ -331,6 +331,14 @@
     <constant name="VertexTrackerOuterRadius"       value="90.0*mm"/>
     <constant name="VertexTrackerOuterBarrelLength" value="400.0*mm"/>
 
+    
+    <constant name="cb_VTX_rmin"   value="33.0*mm"/>
+    <constant name="cb_VTX_rmax"   value="SiliconTrackerInnerRadius - 5.0*mm"/>
+    <constant name="cb_VTX_length" value="SiliconTrackerInnerBarrelLength"/>
+
+    <constant name="cb_VTX_x_pos"   value="0.0*mm"/>
+    <constant name="cb_VTX_y_pos"   value="0.0*mm"/>
+    <constant name="cb_VTX_z_pos"   value="0.0*mm"/>
 
     <comment>
       --------------------------

compact/display.xml

@@ -55,6 +55,7 @@
     <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"/>
     <vis name="cb_GEM_layerVis"    alpha="0.8"  r= "0.8"  g="0.4"  b="0.3"  showDaughters="true" visible="true"/>
+    <vis name="cb_VTXVis"          alpha="0.1"  r= "0.1"  g="0.0"  b="1.0"  showDaughters="true" visible="true"/>
 
     <comment>
       Deprecated colors.

reference_detector.xml

@@ -121,7 +121,7 @@
   <include ref="compact/ce_mrich.xml"/>
   <include ref="compact/ce_GEM.xml"/>
   <include ref="compact/ffi_ZDC.xml"/>
-
+  <include ref="compact/cb_VTX.xml"/>
   <!--
   <include ref="compact/forward_rich.xml"/>
   <include ref="compact/hcal.xml"/>

src/cb_VTX.cpp

+#include <XML/Helper.h>
+#include "DDRec/Surface.h"
+#include "DDRec/DetectorData.h"
+#include "DD4hep/OpticalSurfaces.h"
+#include "DD4hep/DetFactoryHelper.h"
+#include "DD4hep/Printout.h"
+//////////////////////////////////
+// Central Barrel Vertex Detector
+//////////////////////////////////
+
+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 cb_VTX_GVol_Solid(RIn, ROut, SizeZ / 2.0, 0., 360.0 * deg);
+  Volume detVol("cb_VTX_GVol_Logic", cb_VTX_GVol_Solid, Vacuum);
+  detVol.setVisAttributes(desc.visAttributes(x_det.visStr()));
+
+  DetElement   det(detName, detID);
+  Volume       motherVol = desc.pickMotherVolume(det);
+  Transform3D  tr(RotationZYX(0.0, 0.0, 0.0), Position(0.0, 0.0, pos.z()));
+  PlacedVolume detPV = motherVol.placeVolume(detVol, tr);
+  detPV.addPhysVolID("system", detID);
+  detPV.addPhysVolID("barrel", 1);
+  det.setPlacement(detPV);
+  return det;
+}
+
+DECLARE_DETELEMENT(cb_VTX, createDetector)