Created global volume for detector and Added VisAttributes

compact/display.xml

@@ -49,6 +49,7 @@
     <vis name="BeamPipeVis"    alpha="1"  r= "0.75" g="0.75" b="0.75" showDaughters="true" visible="true"/>
 
     <vis name="cb_SolenoidVis" alpha="0.4"  r= "0.1"  g="0.0"  b="0.1"  showDaughters="true" visible="true"/>
+    <vis name="ffi_ZDCVis"     alpha="0.1"  r= "0.1"  g="0.0"  b="1.0"  showDaughters="true" visible="true"/>
 
     <comment>
       Deprecated colors.

src/ffi_ZDC.cpp

@@ -25,12 +25,19 @@ static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens)
   double    y_rot     = dd4hep::getAttrOrDefault(rot, _Unicode(y),0.0);
   double    z_rot     = dd4hep::getAttrOrDefault(rot, _Unicode(z),0.0);
 
+  Material  Vacuum    = desc.material("Vacuum");
 
+  std::cout << "positions: " << x_pos << " , " << z_pos << std::endl;
 
+  // Create Global Volume 
+  Box ffi_ZDC_GVol_Solid(Width * 0.5, Width * 0.5, Thickness * 0.5);
+  Volume detVol("ffi_ZDC_GVol_Logic", ffi_ZDC_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.), Position(0., 0., 0.));
+  Transform3D  tr(RotationZYX(z_rot, y_rot, x_rot), Position(x_pos, 0., z_pos));
   PlacedVolume detPV = motherVol.placeVolume(detVol, tr);
   det.setPlacement(detPV);
   return det;