Fix a data corruption issue in mesh exporter

Apparently mathutils.Vector can refer to external data, in this case the
mesh's UV coordinates, which gets deleted with the mesh.  Copy the values
to make sure they are retained.

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index 125bc5bbbaf01a938af18ec21eefb76239f1534b..91648d28e5b28b1ab6db369586b46d974b0c332e 100644 (file)
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -61,8 +61,8 @@ class Vertex:
                        self.tan = None
                        self.bino = None
                self.index = vertex.index
-               self.co = vertex.co
-               self.normal = vertex.normal
+               self.co = mathutils.Vector(vertex.co)
+               self.normal = mathutils.Vector(vertex.normal)
                self.flag = False
                self.edges = []
                self.faces = []
@@ -148,7 +148,7 @@ class UvLayer:
                else:
                        self._layer = arg
                        self.name = arg.name
-                       self.uvs = [d.uv for d in self.data]
+                       self.uvs = [mathutils.Vector(d.uv) for d in self.data]
 
                self.unit = None
                self.hidden = False