From d930184b57c97cb60e0988e18bb82ac8df37758a Mon Sep 17 00:00:00 2001
From: Joseph Coffland <joseph@cauldrondevelopment.com>
Date: Mon, 7 Aug 2017 17:47:14 -0700
Subject: [PATCH] Add support for exporting part mesh to JSON

---
 src/Mod/Arch/CMakeLists.txt |   1 +
 src/Mod/Arch/Init.py        |   1 +
 src/Mod/Arch/importJSON.py  | 104 ++++++++++++++++++++++++++++++++++++
 3 files changed, 106 insertions(+)
 create mode 100644 src/Mod/Arch/importJSON.py

diff --git a/src/Mod/Arch/CMakeLists.txt b/src/Mod/Arch/CMakeLists.txt
index f0ecc73ef1..1f40145ba3 100644
--- a/src/Mod/Arch/CMakeLists.txt
+++ b/src/Mod/Arch/CMakeLists.txt
@@ -24,6 +24,7 @@ SET(Arch_SRCS
     ArchRoof.py
     ArchStairs.py
     importWebGL.py
+    importJSON.py
     ArchSpace.py
     ArchRebar.py
     TestArch.py
diff --git a/src/Mod/Arch/Init.py b/src/Mod/Arch/Init.py
index cd145d1a8e..10fc0bd968 100644
--- a/src/Mod/Arch/Init.py
+++ b/src/Mod/Arch/Init.py
@@ -27,6 +27,7 @@ FreeCAD.addExportType("Industry Foundation Classes (*.ifc)","importIFC")
 FreeCAD.addImportType("Wavefront OBJ - Arch module (*.obj)","importOBJ")
 FreeCAD.addExportType("Wavefront OBJ - Arch module (*.obj)","importOBJ")
 FreeCAD.addExportType("WebGL file (*.html)","importWebGL")
+FreeCAD.addExportType("JavaScript Object Notation (*.json)","importJSON")
 FreeCAD.addImportType("Collada (*.dae)","importDAE")
 FreeCAD.addExportType("Collada (*.dae)","importDAE")
 FreeCAD.addImportType("3D Studio mesh (*.3ds)","import3DS")
diff --git a/src/Mod/Arch/importJSON.py b/src/Mod/Arch/importJSON.py
new file mode 100644
index 0000000000..79eae80a48
--- /dev/null
+++ b/src/Mod/Arch/importJSON.py
@@ -0,0 +1,104 @@
+#***************************************************************************
+#*                                                                         *
+#*   Copyright (c) 2017                                                    *
+#*   Joseph Coffland <joseph@cauldrondevelopment.com>                      *
+#*                                                                         *
+#*   This program is free software; you can redistribute it and/or modify  *
+#*   it under the terms of the GNU Lesser General Public License (LGPL)    *
+#*   as published by the Free Software Foundation; either version 2 of     *
+#*   the License, or (at your option) any later version.                   *
+#*   for detail see the LICENCE text file.                                 *
+#*                                                                         *
+#*   This program is distributed in the hope that it will be useful,       *
+#*   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+#*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+#*   GNU Library General Public License for more details.                  *
+#*                                                                         *
+#*   You should have received a copy of the GNU Library General Public     *
+#*   License along with this program; if not, write to the Free Software   *
+#*   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+#*   USA                                                                   *
+#*                                                                         *
+#***************************************************************************
+
+"""FreeCAD JSON exporter"""
+
+import FreeCAD, Mesh, Draft, Part
+import json
+
+if FreeCAD.GuiUp:
+    import FreeCADGui
+    from DraftTools import translate
+
+else:
+    FreeCADGui = None
+    def translate(ctxt, txt): return txt
+
+
+if open.__module__ == '__builtin__': pythonopen = open
+
+
+def export(exportList, filename):
+    "exports the given objects to a .json file"
+
+    # Convert objects
+    data = {
+        'version': '0.0.1',
+        'description': 'Mesh data exported from FreeCAD',
+        'objects': [getObjectData(obj) for obj in exportList]
+        }
+
+    # Write file
+    outfile = pythonopen(filename, "wb")
+    json.dump(data, outfile, separators = (',', ':'))
+    outfile.close()
+
+    # Success
+    FreeCAD.Console.PrintMessage(
+        translate("Arch", "successfully written ") + filename + "\n")
+
+
+def getObjectData(obj):
+    result = {'name': str(obj.Label.encode("utf8"))}
+    if hasattr(obj, "Description"): result['description'] = str(obj.Description)
+
+    if FreeCADGui:
+        result['color'] = \
+            Draft.getrgb(obj.ViewObject.ShapeColor, testbw = False)
+
+    if obj.isDerivedFrom("Part::Feature"):
+        mesh = Mesh.Mesh(obj.Shape.tessellate(0.1))
+
+        # Add wires
+        wires = []
+        for f in obj.Shape.Faces:
+            for w in f.Wires:
+                wo = Part.Wire(Part.__sortEdges__(w.Edges))
+                wires.append([[v.x, v.y, v.z]
+                              for v in wo.discretize(QuasiDeflection = 0.1)])
+
+        result['wires'] = wires
+
+    elif obj.isDerivedFrom("Mesh::Feature"): mesh = obj.Mesh
+
+    # Add vertices
+    count = 0
+    vertices = []
+    vIndex = {}
+
+    for p in mesh.Points:
+        v = p.Vector
+        vIndex[p.Index] = count
+        count += 1
+        vertices.append([v.x, v.y, v.z])
+
+    result['vertices'] = vertices
+
+    # Add facets & normals
+    facets = [[vIndex[i] for i in f.PointIndices] for f in mesh.Facets]
+    normals = [[f.Normal.x, f.Normal.y, f.Normal.z] for f in mesh.Facets]
+
+    result['normals'] = normals
+    result['facets'] = facets
+
+    return result