AIDASoft · MarkusFrankATcernch · Aug 24, 2023 · Aug 11, 2023
diff --git a/DDCore/src/Volumes.cpp b/DDCore/src/Volumes.cpp
@@ -1155,14 +1155,17 @@ const Volume& Volume::setVisAttributes(const VisAttr& attr) const {
       if (draw_style == VisAttr::SOLID) {
         m_element->SetFillStyle(1001);   // Root: solid
 
-#if ROOT_VERSION_CODE >= ROOT_VERSION(6,0,0)
+#if ROOT_VERSION_CODE >= ROOT_VERSION(6,29,0)
+        // Set directly transparency to the volume, NOT to the material as for ROOT < 6.29
+        m_element->ResetTransparency(Char_t((1.0-vis->alpha)*100));
+#elif ROOT_VERSION_CODE >= ROOT_VERSION(6,0,0)
         // As suggested by Valentin Volkl https://sft.its.cern.ch/jira/browse/DDFORHEP-20
         //
         // According to https://root.cern.ch/phpBB3/viewtopic.php?t=2309#p66013
         // a transparency>50 will make a volume invisible in the normal pad.
         // Hence: possibly restrict transparency to a maximum of 50.
         //        but let's see first how this behaves.
-        m_element->SetTransparency((1.0-vis->alpha)*100);
+        m_element->SetTransparency(Char_t((1.0-vis->alpha)*100));
 #endif
       }
       else {

diff --git a/examples/ClientTests/compact/visTest.xml b/examples/ClientTests/compact/visTest.xml
@@ -0,0 +1,51 @@
+<lccdd>
+  <!-- Verify transparency handling of ROOT:
+
+       For details see: examples/ClientTests/compact/visTestEx.xml
+       Also see compact/visTestEx.xml for more explanations
+
+  -->
+  <define>
+    <constant name="world_x" value="1*m"/>
+    <constant name="world_y" value="1*m"/>
+    <constant name="world_z" value="1*m"/>
+    <constant name="tracker_region_rmax" value="1*m"/>
+    <constant name="tracker_region_zmax" value="1*m"/>
+    <constant name="tracker_region_zmin" value="-1*m"/>
+  </define>
+
+  <includes>
+    <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
+    <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
+  </includes>
+
+  <display>
+    <vis name="green" alpha="0.2" r= "0.0" g="1.0" b="0.0" />
+    <vis name="blue"  alpha="0.6" r= "0.0" g="0.0" b="1.0" />
+    <vis name="red"   alpha="1.0" r= "1.0" g="0.0" b="0.0" />
+  </display>
+
+  <detectors>
+    <detector name="Tube1" type="DD4hep_TubeSegment" vis="green">
+      <material name="Air"/>
+      <tubs rmin="0" rmax="1*cm" zhalf="2*cm"/>
+      <position x="0*cm" y="-4*cm" z="0"/>
+      <rotation x="0" y="0" z="0"/>
+    </detector>
+
+    <detector name="Tube2" type="DD4hep_TubeSegment" vis="blue">
+      <material name="Iron"/>
+      <tubs rmin="0" rmax="1*cm" zhalf="2*cm"/>
+      <position x="0*cm" y="0*cm" z="0"/>
+      <rotation x="0" y="0" z="0"/>
+    </detector>
+
+    <detector name="Tube3" type="DD4hep_TubeSegment" vis="red">
+      <material name="Iron"/>
+      <tubs rmin="0" rmax="1*cm" zhalf="2*cm"/>
+      <position x="0*cm" y="4*cm" z="0"/>
+      <rotation x="0" y="0" z="0"/>
+    </detector>
+  </detectors>
+
+</lccdd>
diff --git a/examples/ClientTests/compact/visTestEx.xml b/examples/ClientTests/compact/visTestEx.xml
@@ -0,0 +1,57 @@
+<lccdd>
+  <!-- Verify transparency handling of ROOT:
+
+       For details see: examples/ClientTests/compact/visTestEx.xml
+
+       This is the same content as visTest.xml BUT:
+       The construction sequence of the tubes is inversed.
+       With ROOT >= 6.29.1 we want to see the same picture,
+       which was not the case with ROOT < 6.29.1
+
+       Also see compact/visTest.xml
+       Also see scripts/visTest.C
+ -->
+  <define>
+    <constant name="world_x" value="1*m"/>
+    <constant name="world_y" value="1*m"/>
+    <constant name="world_z" value="1*m"/>
+    <constant name="tracker_region_rmax" value="1*m"/>
+    <constant name="tracker_region_zmax" value="1*m"/>
+    <constant name="tracker_region_zmin" value="-1*m"/>
+  </define>
+
+  <includes>
+    <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
+    <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
+  </includes>
+
+  <display>
+    <vis name="green" alpha="0.2" r= "0.0" g="1.0" b="0.0" />
+    <vis name="blue"  alpha="0.6" r= "0.0" g="0.0" b="1.0" />
+    <vis name="red"   alpha="1.0" r= "1.0" g="0.0" b="0.0" />
+  </display>
+
+  <detectors>
+    <detector name="Tube3" type="DD4hep_TubeSegment" vis="red">
+      <material name="Iron"/>
+      <tubs rmin="0" rmax="1*cm" zhalf="2*cm"/>
+      <position x="0*cm" y="4*cm" z="0"/>
+      <rotation x="0" y="0" z="0"/>
+    </detector>
+
+    <detector name="Tube2" type="DD4hep_TubeSegment" vis="blue">
+      <material name="Iron"/>
+      <tubs rmin="0" rmax="1*cm" zhalf="2*cm"/>
+      <position x="0*cm" y="0*cm" z="0"/>
+      <rotation x="0" y="0" z="0"/>
+    </detector>
+
+    <detector name="Tube1" type="DD4hep_TubeSegment" vis="green">
+      <material name="Air"/>
+      <tubs rmin="0" rmax="1*cm" zhalf="2*cm"/>
+      <position x="0*cm" y="-4*cm" z="0"/>
+      <rotation x="0" y="0" z="0"/>
+    </detector>
+  </detectors>
+
+</lccdd>
diff --git a/examples/ClientTests/scripts/visTest.C b/examples/ClientTests/scripts/visTest.C
@@ -0,0 +1,110 @@
+#include "TROOT.h"
+#include "TColor.h"
+#include "TGeoCone.h"
+#include "TGeoMatrix.h"
+#include "TGeoManager.h"
+#include "TGeoElement.h"
+#include "TGeoMaterial.h"
+
+#include <cstdio>
+
+
+class Test    {
+public:
+  TGeoManager*   m_manager = nullptr;
+  TGeoMaterial*  m_vacuum  = nullptr;
+  TGeoMedium*    m_air     = nullptr;
+
+  TGeoBBox*      m_worldShape   = nullptr;
+  TGeoVolume*    m_world = nullptr;
+
+  struct Cone   {
+    TGeoMaterial* material = nullptr;
+    TGeoMedium*  medium = nullptr;
+    TGeoConeSeg* shape = nullptr;
+    TGeoVolume* volume = nullptr;
+    TGeoNode* place = nullptr;
+    void set_color(const char* typ, Float_t alpha, Float_t red, Float_t green, Float_t blue)   {
+      Int_t col = TColor::GetColor(red, green, blue);
+      TColor* color = gROOT->GetColor(col);
+      if ( !color )    {
+        ::printf("+++ %s Failed to allocate Color: r:%02X g:%02X b:%02X\n",
+                 typ, int(red*255.), int(green*255.), int(blue*255));
+      }
+      char text[64];
+      ::snprintf(text, sizeof(text), "%p", this);
+      TColor* colortr = new TColor(gROOT->GetListOfColors()->GetLast()+1,
+                                   color->GetRed(), color->GetGreen(), color->GetBlue(), text, alpha);
+      //colortr->SetAlpha(alpha);
+
+      ::printf("Plot cone %s (col: %d) with transparency %8.3f r:%02X g:%02X b:%02X\n",
+               typ, col, (1.0-alpha)*100, int(red*255.), int(green*255.), int(blue*255));
+
+      /// Propagate values to the volume:
+      int col_num    = color->GetNumber();
+      int col_tr_num = colortr->GetNumber();
+      volume->SetVisibility(kTRUE);
+      volume->SetVisContainers(kTRUE);
+      volume->SetVisDaughters(kTRUE);
+      volume->SetLineWidth(10);
+      volume->SetFillStyle(1001);
+      volume->ResetTransparency((1.0-alpha)*100);
+      volume->SetLineStyle(1);
+
+      /// Set line color
+      volume->SetLineColor(col_num);
+      /// Set fill color
+      volume->SetFillColor(col_tr_num);
+    }
+  } cone1, cone2;
+
+public:
+  Test()   {
+  }
+  virtual ~Test()   {
+  }
+  void build(int version);
+};
+
+void Test::build(int version)    {
+  m_manager = new TGeoManager("geom","Tube test");
+  m_vacuum = new TGeoMaterial("vacuum", 0, 0, 0);
+  m_air = new TGeoMedium("Vacuum", 0, m_vacuum);
+
+  m_worldShape = new TGeoBBox("WorldBox", 100, 100, 100);
+  m_world = new TGeoVolume("World", m_worldShape, m_air);
+
+  cone1.material = new TGeoMaterial("Fe1", 55.845, 26, 7.87);
+  cone1.medium   = new TGeoMedium("Iron1", 1, cone1.material);
+  cone1.shape    = new TGeoConeSeg("Cone1Shape", 40, 0e0, 20e0, 0e0, 20e0, 0e0, 360e0);
+  cone1.volume   = new TGeoVolume("Cone1", cone1.shape, cone1.medium);
+  cone1.set_color("Cone1",
+                  version ? 0.1 : 0.9,
+                  version ? 1e0 : 0e0,
+                  0e0,
+                  version ? 0e0 : 1e0);
+  m_world->AddNode(cone1.volume, 1, new TGeoTranslation(-30, -30, 0));
+
+  cone2.material = version ? new TGeoMaterial("Fe2", 55.845, 26, 7.87) : cone1.material;
+  cone2.medium   = version ? new TGeoMedium("Iron2", 1, cone2.material) : cone1.medium;
+  cone2.shape    = new TGeoConeSeg("Cone2Shape", 40, 0e0, 20e0, 0e0, 20e0, 0e0, 360e0);
+  cone2.volume   = new TGeoVolume("Cone2", cone2.shape, cone2.medium);
+  cone2.set_color("Cone2",
+                  version ? 0.9 : 0.1,
+                  version ? 0e0 : 0.9,
+                  0e0,
+                  version ? 0.9 : 0e0);
+  m_world->AddNode(cone2.volume, 1, new TGeoTranslation(30, 30, 0));
+
+  m_manager->SetTopVolume(m_world);
+  m_manager->SetTopVisible(0);
+
+  m_manager->GetTopVolume()->Draw("ogl");
+}
+
+
+Test* visTest(int version=0)   {
+  Test* obj = new Test();
+  obj->build(version);
+  return obj;
+}