From 74b866ed3022fd1452c534dae31a721bcc668f2f Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sun, 22 Nov 2020 16:11:24 +0100
Subject: [PATCH] Import: [skip ci] add support of glTF format (requires OCCT
 7.5)

---
 cMake/FindOpenCasCade.cmake           |  2 ++
 src/Mod/Import/Gui/AppImportGuiPy.cpp | 21 +++++++++++++++++++++
 src/Mod/Import/InitGui.py             |  1 +
 3 files changed, 24 insertions(+)

diff --git a/cMake/FindOpenCasCade.cmake b/cMake/FindOpenCasCade.cmake
index 1668794d6e..95dadd2935 100644
--- a/cMake/FindOpenCasCade.cmake
+++ b/cMake/FindOpenCasCade.cmake
@@ -156,6 +156,8 @@ if(OCC_FOUND)
   )
   if(OCC_VERSION_STRING VERSION_LESS 6.7.3)
     list(APPEND OCC_OCAF_LIBRARIES TKAdvTools)
+  elseif(NOT OCC_VERSION_STRING VERSION_LESS 7.5.0)
+    list(APPEND OCC_OCAF_LIBRARIES TKRWMesh)
   endif(OCC_VERSION_STRING VERSION_LESS 6.7.3)
   message(STATUS "-- Found OCE/OpenCASCADE version: ${OCC_VERSION_STRING}")
   message(STATUS "-- OCE/OpenCASCADE include directory: ${OCC_INCLUDE_DIR}")
diff --git a/src/Mod/Import/Gui/AppImportGuiPy.cpp b/src/Mod/Import/Gui/AppImportGuiPy.cpp
index ff3d2b2bdd..3ecbd2b9e2 100644
--- a/src/Mod/Import/Gui/AppImportGuiPy.cpp
+++ b/src/Mod/Import/Gui/AppImportGuiPy.cpp
@@ -69,6 +69,11 @@
 # include <TopoDS_Iterator.hxx>
 # include <APIHeaderSection_MakeHeader.hxx>
 # include <OSD_Exception.hxx>
+# include <TColStd_IndexedDataMapOfStringString.hxx>
+#if OCC_VERSION_HEX >= 0x070500
+# include <RWGltf_CafWriter.hxx>
+# include <Message_ProgressRange.hxx>
+#endif
 #if OCC_VERSION_HEX >= 0x060500
 # include <TDataXtd_Shape.hxx>
 # else
@@ -683,6 +688,22 @@ private:
                     throw Py::Exception();
                 }
             }
+            else if (file.hasExtension("glb") || file.hasExtension("gltf")) {
+#if OCC_VERSION_HEX >= 0x070500
+                TColStd_IndexedDataMapOfStringString aMetadata;
+                RWGltf_CafWriter aWriter (name8bit.c_str(), file.hasExtension("glb"));
+                aWriter.SetTransformationFormat (RWGltf_WriterTrsfFormat_Compact);
+                aWriter.ChangeCoordinateSystemConverter().SetInputLengthUnit (0.001);
+                aWriter.ChangeCoordinateSystemConverter().SetInputCoordinateSystem (RWMesh_CoordinateSystem_Zup);
+                Standard_Boolean ret = aWriter.Perform (hDoc, aMetadata, Message_ProgressRange());
+                if (!ret) {
+                    PyErr_Format(PyExc_IOError, "Cannot save to file '%s'", Utf8Name.c_str());
+                    throw Py::Exception();
+                }
+#else
+                throw Py::RuntimeError("gITF support requires OCCT 7.5.0 or later");
+#endif
+            }
 
             hApp->Close(hDoc);
         }
diff --git a/src/Mod/Import/InitGui.py b/src/Mod/Import/InitGui.py
index 046d29709f..fa535cb731 100644
--- a/src/Mod/Import/InitGui.py
+++ b/src/Mod/Import/InitGui.py
@@ -33,6 +33,7 @@
 # Registered in Part's Init.py file
 FreeCAD.changeImportModule("STEP with colors (*.step *.stp)","Import","ImportGui")
 FreeCAD.changeExportModule("STEP with colors (*.step *.stp)","Import","ImportGui")
+FreeCAD.addExportType("glTF (*.gltf *.glb)","ImportGui")
 
 """
 class ImportWorkbench ( Workbench ):