From e6a6ab89e638ff4e9edf7f9527998740ce4654b5 Mon Sep 17 00:00:00 2001
From: Christopher Lackner <clackner@cerbsim.com>
Date: Mon, 4 Oct 2021 09:27:33 +0200
Subject: [PATCH] write transparency in mesh file and also read it if avail

The indexing is a little weird but consistent to before so leave it
like this
---
 libsrc/meshing/bcfunctions.cpp |  6 +++---
 libsrc/meshing/meshclass.cpp   | 39 ++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/libsrc/meshing/bcfunctions.cpp b/libsrc/meshing/bcfunctions.cpp
index a1cad516..fd7441ad 100644
--- a/libsrc/meshing/bcfunctions.cpp
+++ b/libsrc/meshing/bcfunctions.cpp
@@ -259,12 +259,12 @@ namespace netgen
          if(bc_index == 0) 
          {
             PrintMessage(3, "BC Property: ",DEFAULT_BCNUM);
-            // PrintMessage(3, "   RGB Face Colour = ",ref_colour,"","\n");
+            PrintMessage(3, "   RGB Face Colour = ",Vec3d{ref_colour[0], ref_colour[1], ref_colour[2]},"","\n");
          }
          else if(bc_used.Elem(bc_index))
          {
             PrintMessage(3, "BC Property: ",bc_num.Elem(bc_index));
-            // PrintMessage(3, "   RGB Face Colour = ",ref_colour,"","\n");
+            PrintMessage(3, "   RGB Face Colour = ",Vec3d{ref_colour[0], ref_colour[1], ref_colour[2]},"","\n");
          }
       }
    }
@@ -401,7 +401,7 @@ namespace netgen
          PrintMessage(3, "BC Property: ",i + DEFAULT_BCNUM);
          PrintMessage(3, "   Nr. of Surface Elements = ", faces_sorted[i]);
          PrintMessage(3, "   Colour Index = ", colours_sorted[i]);
-         // PrintMessage(3, "   RGB Face Colour = ",ref_colour,"","\n");
+         PrintMessage(3, "   RGB Face Colour = ",Vec3d{ref_colour[0], ref_colour[1], ref_colour[2]},"","\n");
       }
    }
 
diff --git a/libsrc/meshing/meshclass.cpp b/libsrc/meshing/meshclass.cpp
index 2a3c1895..7ffa7f09 100644
--- a/libsrc/meshing/meshclass.cpp
+++ b/libsrc/meshing/meshclass.cpp
@@ -1080,6 +1080,15 @@ namespace netgen
           outfile << GetFaceDescriptor(i).SurfColour()[2];
           outfile << endl;
        }
+
+       outfile << "face_transparencies" << endl << cnt_facedesc << endl;
+       for(i = 1; i <= cnt_facedesc; i++)
+         {
+           outfile.width(8);
+           outfile << GetFaceDescriptor(i).SurfNr()+1 << " ";
+           outfile.width(12);
+           outfile << GetFaceDescriptor(i).SurfColour()[3] << endl;
+         }
     }
 
     outfile << endl << endl << "endmesh" << endl << endl;
@@ -1570,6 +1579,36 @@ namespace netgen
            }
         }
 
+        if (strcmp (str, "face_transparencies") == 0)
+          {
+            int cnt_facedesc = GetNFD();
+            infile >> n;
+            int index = 1;
+            if(n == cnt_facedesc)
+              {
+                for(int index = 1; index <= n; index++)
+                  {
+                    int surfnr;
+                    double transp;
+                    infile >> surfnr >> transp;
+                    surfnr--;
+                    if(surfnr > 0)
+                      {
+                        for(int facedesc = 1; facedesc <= cnt_facedesc; facedesc++)
+                          {
+                            if(surfnr == GetFaceDescriptor(facedesc).SurfNr())
+                              {
+                                auto& fd = GetFaceDescriptor(facedesc);
+                                auto scol = fd.SurfColour();
+                                scol[3] = transp;
+                                fd.SetSurfColour(scol);
+                              }
+                          }
+                      }
+                  }
+              }
+          }
+
         if (strcmp (str, "endmesh") == 0)
           endmesh = true;