From eeaa1dcf7e383517e8097c9438a286e3810962ae Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 15 Jul 2015 00:00:32 +0300
Subject: [PATCH] Properly handle compound children with non-identity local
 matrix

---
 blender/io_mspgl/export_mesh.py | 31 +++++++++++++++++++------------
 blender/io_mspgl/mesh.py        |  7 +++++++
 2 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/blender/io_mspgl/export_mesh.py b/blender/io_mspgl/export_mesh.py
index cae0e589..07f457a1 100644
--- a/blender/io_mspgl/export_mesh.py
+++ b/blender/io_mspgl/export_mesh.py
@@ -1,5 +1,6 @@
 import itertools
 import bpy
+import mathutils
 
 class VertexCache:
 	def __init__(self, size):
@@ -193,24 +194,27 @@ class MeshExporter:
 		return strips, loose
 
 	def export(self, context, out_file, objs=None, progress=None):
+		if objs:
+			objs = [(o, mathutils.Matrix()) for i in objs]
+
 		if self.compound:
 			if objs is None:
-				objs = context.selected_objects
+				objs = [(o, mathutils.Matrix()) for o in context.selected_objects]
 			check = objs
 			while check:
 				children = []
-				for o in check:
+				for o, m in check:
 					for c in o.children:
 						if c.compound:
-							children.append(c)
+							children.append((c, m*c.matrix_local))
 				objs += children
 				check = children
 		elif objs is None:
-			objs = [context.active_object]
+			objs = [(context.active_object, mathutils.Matrix())]
 
 		if not objs:
 			raise Exception("Nothing to export")
-		for o in objs:
+		for o, m in objs:
 			if o.type!="MESH":
 				raise Exception("Can only export Mesh data")
 
@@ -226,13 +230,15 @@ class MeshExporter:
 
 		mesh = None
 		bmeshes = []
-		for o in objs:
+		for o, m in objs:
 			bmesh = o.to_mesh(context.scene, True, "PREVIEW")
 			bmeshes.append(bmesh)
+			me = Mesh(bmesh)
+			me.transform(m)
 			if not mesh:
-				mesh = Mesh(bmesh)
+				mesh = me
 			else:
-				mesh.splice(Mesh(bmesh))
+				mesh.splice(me)
 
 		if progress:
 			progress.set_task("Smoothing", 0.05, 0.35)
@@ -247,11 +253,12 @@ class MeshExporter:
 			mesh.sort_vertex_groups(self.max_groups)
 
 			# Create a mapping from vertex group indices to bone indices
-			group_index_map = dict((i, i) for i in range(len(objs[0].vertex_groups)))
-			if objs[0].parent and objs[0].parent.type=="ARMATURE":
-				armature = objs[0].parent.data
+			first_obj = objs[0][0]
+			group_index_map = dict((i, i) for i in range(len(first_obj.vertex_groups)))
+			if first_obj.parent and first_obj.parent.type=="ARMATURE":
+				armature = first_obj.parent.data
 				bone_indices = dict((armature.bones[i].name, i) for i in range(len(armature.bones)))
-				for g in objs[0].vertex_groups:
+				for g in first_obj.vertex_groups:
 					if g.name in bone_indices:
 						group_index_map[g.index] = bone_indices[g.name]
 
diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index 04b2b51f..2cd64236 100644
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -45,6 +45,7 @@ class Vertex:
 	def __init__(self, mv):
 		if mv.__class__==Vertex:
 			self._mvert = mv._mvert
+			self.co = mv.co
 			self.normal = mv.normal
 			self.uvs = mv.uvs[:]
 			self.tan = mv.tan
@@ -52,6 +53,8 @@ class Vertex:
 			self.group_weight_scale = mv.group_weight_scale
 		else:
 			self._mvert = mv
+			self.co = mv.co
+			self.normal = mv.normal
 			self.uvs = []
 			self.tan = None
 			self.bino = None
@@ -179,6 +182,10 @@ class Mesh:
 	def __getattr__(self, attr):
 		return getattr(self._mesh, attr)
 
+	def transform(self, matrix):
+		for v in self.vertices:
+			v.co = matrix*v.co
+
 	def splice(self, other):
 		material_map = []
 		for m in other.materials:
-- 
2.43.0