Deep copy vertex groups when copying vertices in the exporter

If multiple vertices reference the same group data after splitting
by normals, group mapping gets applied multiple times, resulting in
incorrect group indices.

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index c0d9c11b872ee6e079e52dbb7d97648ec88c81fa..0856ef2a09b7f3afbafa83b31671ad0891fdc3f2 100644 (file)
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -47,9 +47,11 @@ class Vertex:
                if vertex.__class__==Vertex:
                        self.uvs = vertex.uvs[:]
                        self.tan = vertex.tan
+                       self.groups = [VertexGroup(g) for g in vertex.groups]
                else:
                        self.uvs = []
                        self.tan = None
+                       self.groups = []
                self.index = vertex.index
                self.co = mathutils.Vector(vertex.co)
                self.normal = mathutils.Vector(vertex.normal)
@@ -57,7 +59,6 @@ class Vertex:
                self.flag = False
                self.edges = []
                self.faces = []
-               self.groups = vertex.groups[:]
 
        def __cmp__(self, other):
                if other is None:
@@ -178,7 +179,7 @@ class Mesh:
                self.vertices = [Vertex(v) for v in mesh.vertices]
                if self.vertex_groups:
                        for v in self.vertices:
-                               v.groups = [VertexGroup(g) for g in v.groups]
+                               v.groups = [VertexGroup(g) for g in mesh.vertices[v.index].groups]
 
                self.faces = [Face(f) for f in mesh.polygons]
                self.edges = [Edge(e) for e in mesh.edges]