diff --git a/psychoblend/assembly.py b/psychoblend/assembly.py
new file mode 100644
index 0000000..ce90d7a
--- /dev/null
+++ b/psychoblend/assembly.py
@@ -0,0 +1,265 @@
+import bpy
+
+from .util import escape_name, mat2str, needs_def_mb, needs_xform_mb
+
+class Assembly:
+    def __init__(self, render_engine, objects, visible_layers, group_prefix="", translation_offset=(0,0,0)):
+        self.name = group_prefix
+        self.translation_offset = translation_offset
+        self.render_engine = render_engine
+        
+        self.materials = []
+        self.objects = []
+        self.instances = []
+
+        self.mesh_names = set()
+        self.assembly_names = set()
+
+        # Collect all the objects, materials, instances, etc.
+        for ob in objects:
+            # Check if render is cancelled
+            if render_engine.test_break():
+                raise ExportCancelled()
+
+            # Check if the object is visible for rendering
+            vis_layer = False
+            for i in range(len(ob.layers)):
+                vis_layer = vis_layer or (ob.layers[i] and visible_layers[i])
+            if ob.hide_render or not vis_layer:
+                continue
+
+            # Store object data
+            name = None
+
+            if ob.type == 'EMPTY':
+                if ob.dupli_type == 'GROUP':
+                    name = group_prefix + "__" + escape_name(ob.dupli_group.name)
+                    if name not in self.assembly_names:
+                        self.assembly_names.add(name)
+                        self.objects += [Assembly(self.render_engine, ob.dupli_group.objects, ob.dupli_group.layers, name, ob.dupli_group.dupli_offset*-1)]
+            elif ob.type == 'MESH':
+                name = self.get_mesh(ob, group_prefix)
+            elif ob.type == 'LAMP' and ob.data.type == 'POINT':
+                name = self.get_sphere_lamp(ob, group_prefix)
+            elif ob.type == 'LAMP' and ob.data.type == 'AREA':
+                name = self.get_rect_lamp(ob, group_prefix)
+            
+            # Store instance
+            if name != None:
+                self.instances += [Instance(render_engine, ob, name)]
+
+    def export(self, render_engine, w):
+        if self.name == "":
+            w.write("Assembly {\n")
+        else:
+            w.write("Assembly $%s {\n" % self.name)
+        w.indent()
+
+        for mat in self.materials:
+            # Check if render is cancelled
+            if render_engine.test_break():
+                raise ExportCancelled()
+            mat.export(render_engine, w)
+
+        for ob in self.objects:
+            # Check if render is cancelled
+            if render_engine.test_break():
+                raise ExportCancelled()
+            ob.export(render_engine, w)
+
+        for inst in self.instances:
+            # Check if render is cancelled
+            if render_engine.test_break():
+                raise ExportCancelled()
+            inst.export(render_engine, w)
+
+        w.unindent()
+        w.write("}\n")
+    
+    #----------------
+
+    def take_sample(self, render_engine, scene, time):
+        for mat in self.materials:
+            mat.take_sample(render_engine, scene, time)
+        for ob in self.objects:
+            ob.take_sample(render_engine, scene, time)
+        for inst in self.instances:
+            inst.take_sample(render_engine, time, self.translation_offset)
+    
+    def cleanup(self):
+        for mat in self.materials:
+            mat.cleanup()
+        for ob in self.objects:
+            ob.cleanup()
+
+    def get_mesh(self, ob, group_prefix):
+        # Figure out if we need to export or not and figure out what name to
+        # export with.
+        has_modifiers = len(ob.modifiers) > 0
+        deform_mb = needs_def_mb(ob)
+        if has_modifiers or deform_mb:
+            mesh_name = group_prefix + escape_name("__" + ob.name + "__" + ob.data.name + "_")
+        else:
+            mesh_name = group_prefix + escape_name("__" + ob.data.name + "_")
+        should_export_mesh = mesh_name not in self.mesh_names
+        
+        # Get mesh
+        if should_export_mesh:
+            self.mesh_names.add(mesh_name)
+            self.objects += [Mesh(self.render_engine, ob, mesh_name)]
+            return mesh_name
+        else:
+            return None
+    
+    def get_sphere_lamp(self, ob, group_prefix):
+        name = group_prefix + "__" + escape_name(ob.name)
+        self.objects += [SphereLamp(self.render_engine, ob, name)]
+        return name
+
+    def get_rect_lamp(self, ob, group_prefix):
+        name = group_prefix + "__" + escape_name(ob.name)
+        self.objects += [RectLamp(self.render_engine, ob, name)]
+        return name
+
+
+#=========================================================================
+
+
+class Mesh:
+    """ Holds data for a mesh to be exported.
+    """
+    def __init__(self, render_engine, ob, name):
+        self.ob = ob
+        self.name = name
+        self.time_meshes = []
+
+    def take_sample(self, render_engine, scene, time):
+        render_engine.update_stats("", "Psychopath: Collecting '%s' at time %f" % (self.ob.name, time))
+        self.time_meshes += [self.ob.to_mesh(scene, True, 'RENDER')]
+    
+    def cleanup(self):
+        for mesh in self.time_meshes:
+            bpy.data.meshes.remove(mesh)
+
+    def export(self, render_engine, w):
+        render_engine.update_stats("", "Psychopath: Exporting %s" % self.ob.name)
+
+        if self.ob.data.psychopath.is_subdivision_surface == False:
+            # Exporting normal mesh
+            w.write("MeshSurface $%s {\n" % self.name)
+            w.indent()
+        else:
+            # Exporting subdivision surface cage
+            w.write("SubdivisionSurface $%s {\n" % self.name)
+            w.indent()
+
+        # Write vertices
+        for ti in range(len(self.time_meshes)):
+            w.write("Vertices [")
+            w.write(" ".join([("%f" % i) for vert in self.time_meshes[ti].vertices for i in vert.co]), False)
+            w.write("]\n", False)
+
+        # Write face vertex counts
+        w.write("FaceVertCounts [")
+        w.write(" ".join([("%d" % len(p.vertices)) for p in self.time_meshes[0].polygons]), False)
+        w.write("]\n", False)
+
+        # Write face vertex indices
+        w.write("FaceVertIndices [")
+        w.write(" ".join([("%d"%v) for p in self.time_meshes[0].polygons for v in p.vertices]), False)
+        w.write("]\n", False)
+
+        # MeshSurface/SubdivisionSurface section end
+        w.unindent()
+        w.write("}\n")
+
+
+class SphereLamp:
+    """ Holds data for a sphere light to be exported.
+    """
+    def __init__(self, render_engine, ob, name):
+        self.ob = ob
+        self.name = name
+        self.time_col = []
+        self.time_rad = []
+
+    def take_sample(self, render_engine, scene, time):
+        render_engine.update_stats("", "Psychopath: Collecting '%s' at time %f" % (self.ob.name, time))
+        self.time_col += [self.ob.data.color * self.ob.data.energy]
+        self.time_rad += [self.ob.data.shadow_soft_size]
+
+    def cleanup(self):
+        pass
+    
+    def export(self, render_engine, w):
+        render_engine.update_stats("", "Psychopath: Exporting %s" % self.ob.name)
+
+        w.write("SphereLight $%s {\n" % self.name)
+        w.indent()
+        for col in self.time_col:
+            w.write("Color [%f %f %f]\n" % (col[0], col[1], col[2]))
+        for rad in self.time_rad:
+            w.write("Radius [%f]\n" % rad)
+
+        w.unindent()
+        w.write("}\n")
+
+
+class RectLamp:
+    """ Holds data for a rectangular light to be exported.
+    """
+    def __init__(self, render_engine, ob, name):
+        self.ob = ob
+        self.name = name
+        self.time_col = []
+        self.time_dim = []
+
+    def take_sample(self, render_engine, scene, time):
+        render_engine.update_stats("", "Psychopath: Collecting '%s' at time %f" % (self.ob.name, time))
+        self.time_col += [self.ob.data.color * self.ob.data.energy]
+        if ob.data.shape == 'RECTANGLE':
+            self.time_dim += [(self.ob.data.size, self.ob.data.size_y)]
+        else:
+            self.time_dim += [(self.ob.data.size, self.ob.data.size)]
+    
+    def cleanup(self):
+        pass
+    
+    def export(self, render_engine, w):
+        render_engine.update_stats("", "Psychopath: Exporting %s" % self.ob.name)
+
+        w.write("RectangleLight $%s {\n" % self.name)
+        w.indent()
+        for col in self.time_col:
+            w.write("Color [%f %f %f]\n" % (col[0], col[1], col[2]))
+        for dim in self.time_dim:
+            w.write("Dimensions [%f %f]\n" % dim)
+
+        w.unindent()
+        w.write("}\n")
+
+
+class Instance:
+    def __init__(self, render_engine, ob, data_name):
+        self.ob = ob
+        self.data_name = data_name
+        self.time_xforms = []
+
+    def take_sample(self, render_engine, time, translation_offset):
+        render_engine.update_stats("", "Psychopath: Collecting '%s' at time %f" % (self.ob.name, time))
+        mat = self.ob.matrix_world.copy()
+        mat[0][3] += translation_offset[0]
+        mat[1][3] += translation_offset[1]
+        mat[2][3] += translation_offset[2]
+        self.time_xforms += [mat]
+
+    def export(self, render_engine, w):
+        render_engine.update_stats("", "Psychopath: Exporting %s" % self.ob.name)
+
+        w.write("Instance {\n")
+        w.indent()
+        w.write("Data [$%s]\n" % self.data_name)
+        for mat in self.time_xforms:
+            w.write("Transform [%s]\n" % mat2str(mat.inverted()))
+        w.unindent()
+        w.write("}\n")
diff --git a/psychoblend/psy_export.py b/psychoblend/psy_export.py
index 7457b5a..6480894 100644
--- a/psychoblend/psy_export.py
+++ b/psychoblend/psy_export.py
@@ -3,6 +3,9 @@ import bpy
 from math import degrees, pi, log
 from mathutils import Vector, Matrix
 
+from .assembly import Assembly
+from .util import escape_name, mat2str
+
 class ExportCancelled(Exception):
     """ Indicates that the render was cancelled in the middle of exporting
         the scene file.
@@ -10,66 +13,6 @@ class ExportCancelled(Exception):
     pass
 
 
-def mat2str(m):
-    """ Converts a matrix into a single-line string of values.
-    """
-    s = ""
-    for j in range(4):
-        for i in range(4):
-            s += (" %f" % m[i][j])
-    return s[1:]
-
-
-def needs_def_mb(ob):
-    """ Determines if the given object needs to be exported with
-        deformation motion blur or not.
-    """
-    for mod in ob.modifiers:
-        if mod.type == 'SUBSURF':
-            pass
-        elif mod.type == 'MIRROR':
-            if mod.mirror_object == None:
-                pass
-            else:
-                return True
-        else:
-            return True
-
-    if ob.type == 'MESH':
-        if ob.data.shape_keys == None:
-            pass
-        else:
-            return True
-
-    return False
-
-def escape_name(name):
-    name = name.replace("\\", "\\\\")
-    name = name.replace(" ", "\\ ")
-    name = name.replace("$", "\\$")
-    name = name.replace("[", "\\[")
-    name = name.replace("]", "\\]")
-    name = name.replace("{", "\\{")
-    name = name.replace("}", "\\}")
-    return name
-
-
-def needs_xform_mb(ob):
-    """ Determines if the given object needs to be exported with
-        transformation motion blur or not.
-    """
-    if ob.animation_data != None:
-        return True
-
-    if len(ob.constraints) > 0:
-        return True
-
-    if ob.parent != None:
-        return needs_xform_mb(ob.parent)
-
-    return False
-
-
 class IndentedWriter:
     def __init__(self, file_handle):
         self.f = file_handle
@@ -91,8 +34,6 @@ class IndentedWriter:
             self.f.write(bytes(text, "utf-8"))
 
 
-
-
 class PsychoExporter:
     def __init__(self, f, render_engine, scene):
         self.w = IndentedWriter(f)
@@ -231,253 +172,23 @@ class PsychoExporter:
 
         #######################
         # Export objects and materials
-        # TODO: handle materials from linked files (as used in group
-        # instances) properly.
-        self.w.write("Assembly {\n")
-        self.w.indent()
-        self.export_materials(bpy.data.materials)
-        self.export_objects(self.scene.objects, self.scene.layers)
-        self.w.unindent()
-        self.w.write("}\n")
+        try:
+            root_assembly = Assembly(self.render_engine, self.scene.objects, self.scene.layers)
+            for i in range(self.time_samples):
+                time = self.fr + self.shutter_start + (self.shutter_diff*i)
+                self.set_frame(self.fr, self.shutter_start + (self.shutter_diff*i))
+                root_assembly.take_sample(self.render_engine, self.scene, time)
+            root_assembly.export(self.render_engine, self.w)
+        except ExportCancelled:
+            root_assembly.cleanup()
+            raise ExportCancelled()
+        else:
+            root_assembly.cleanup()
 
         # Scene end
         self.w.unindent()
         self.w.write("}\n")
 
-
-
-    def export_materials(self, materials):
-        for m in materials:
-            self.w.write("SurfaceShader $%s {\n" % escape_name(m.name))
-            self.w.indent()
-            self.w.write("Type [%s]\n" % m.psychopath.surface_shader_type)
-            self.w.write("Color [%f %f %f]\n" % (m.psychopath.color[0], m.psychopath.color[1], m.psychopath.color[2]))
-            if m.psychopath.surface_shader_type == 'GTR':
-                self.w.write("Roughness [%f]\n" % m.psychopath.roughness)
-                self.w.write("TailShape [%f]\n" % m.psychopath.tail_shape)
-                self.w.write("Fresnel [%f]\n" % m.psychopath.fresnel)
-            self.w.unindent()
-            self.w.write("}\n")
-
-
-    def export_objects(self, objects, visible_layers, group_prefix="", translation_offset=(0,0,0)):
-        for ob in objects:
-            # Check if render is cancelled
-            if self.render_engine.test_break():
-                raise ExportCancelled()
-
-            # Check if the object is visible for rendering
-            vis_layer = False
-            for i in range(len(ob.layers)):
-                vis_layer = vis_layer or (ob.layers[i] and visible_layers[i])
-            if ob.hide_render or not vis_layer:
-                continue
-
-            name = None
-
-            # Write object data
-            if ob.type == 'EMPTY':
-                if ob.dupli_type == 'GROUP':
-                    name = group_prefix + "__" + escape_name(ob.dupli_group.name)
-                    if name not in self.group_names:
-                        self.group_names[name] = True
-                        self.w.write("Assembly $%s {\n" % name)
-                        self.w.indent()
-                        self.export_objects(ob.dupli_group.objects, ob.dupli_group.layers, name, ob.dupli_group.dupli_offset*-1)
-                        self.w.unindent()
-                        self.w.write("}\n")
-            elif ob.type == 'MESH':
-                name = self.export_mesh_object(ob, group_prefix)
-            elif ob.type == 'SURFACE':
-                name = self.export_surface_object(ob, group_prefix)
-            elif ob.type == 'LAMP' and ob.data.type == 'POINT':
-                name = self.export_sphere_lamp(ob, group_prefix)
-            elif ob.type == 'LAMP' and ob.data.type == 'AREA':
-                name = self.export_area_lamp(ob, group_prefix)
-
-            # Write object instance, with transforms
-            if name != None:
-                time_mats = []
-
-                if needs_xform_mb(ob):
-                    for i in range(self.time_samples):
-                        # Check if render is cancelled
-                        if self.render_engine.test_break():
-                            raise ExportCancelled()
-                        self.set_frame(self.fr, self.shutter_start + (self.shutter_diff*i))
-                        mat = ob.matrix_world.copy()
-                        mat[0][3] += translation_offset[0]
-                        mat[1][3] += translation_offset[1]
-                        mat[2][3] += translation_offset[2]
-                        time_mats += [mat]
-                else:
-                    mat = ob.matrix_world.copy()
-                    mat[0][3] += translation_offset[0]
-                    mat[1][3] += translation_offset[1]
-                    mat[2][3] += translation_offset[2]
-                    time_mats += [mat]
-
-                self.w.write("Instance {\n")
-                self.w.indent()
-                self.w.write("Data [$%s]\n" % name)
-                if len(ob.material_slots) > 0 and ob.material_slots[0].material != None:
-                    self.w.write("SurfaceShaderBind [$%s]\n" % escape_name(ob.material_slots[0].material.name))
-                for i in range(len(time_mats)):
-                    mat = time_mats[i].inverted()
-                    self.w.write("Transform [%s]\n" % mat2str(mat))
-                self.w.unindent()
-                self.w.write("}\n")
-
-
-    def export_mesh_object(self, ob, group_prefix):
-        # Determine if and how to export the mesh data
-        has_modifiers = len(ob.modifiers) > 0
-        deform_mb = needs_def_mb(ob)
-        if has_modifiers or deform_mb:
-            mesh_name = group_prefix + escape_name("__" + ob.name + "__" + ob.data.name + "_")
-        else:
-            mesh_name = group_prefix + escape_name("__" + ob.data.name + "_")
-        export_mesh = (mesh_name not in self.mesh_names) or has_modifiers or deform_mb
-
-        # Collect time samples
-        time_meshes = []
-        if deform_mb:
-            for i in range(self.time_samples):
-                # Check if render is cancelled
-                if self.render_engine.test_break():
-                    raise ExportCancelled()
-                self.set_frame(self.fr, self.shutter_start + (self.shutter_diff*i))
-                if export_mesh and (deform_mb or i == 0):
-                    time_meshes += [ob.to_mesh(self.scene, True, 'RENDER')]
-        elif export_mesh:
-            time_meshes += [ob.to_mesh(self.scene, True, 'RENDER')]
-
-        # Export mesh data if necessary
-        if export_mesh:
-            if ob.data.psychopath.is_subdivision_surface == False:
-                # Exporting normal mesh
-                self.mesh_names[mesh_name] = True
-                self.w.write("MeshSurface $%s {\n" % mesh_name)
-                self.w.indent()
-            elif ob.data.psychopath.is_subdivision_surface == True:
-                # Exporting subdivision surface cage
-                self.mesh_names[mesh_name] = True
-                self.w.write("SubdivisionSurface $%s {\n" % mesh_name)
-                self.w.indent()
-
-            # Write vertices
-            for ti in range(len(time_meshes)):
-                self.w.write("Vertices [")
-                self.w.write(" ".join([("%f" % i) for vert in time_meshes[ti].vertices for i in vert.co]), False)
-                self.w.write("]\n", False)
-
-            # Write face vertex counts
-            self.w.write("FaceVertCounts [")
-            self.w.write(" ".join([("%d" % len(p.vertices)) for p in time_meshes[0].polygons]), False)
-            self.w.write("]\n", False)
-
-            # Write face vertex indices
-            self.w.write("FaceVertIndices [")
-            self.w.write(" ".join([("%d"%v) for p in time_meshes[0].polygons for v in p.vertices]), False)
-            self.w.write("]\n", False)
-
-            # MeshSurface/SubdivisionSurface section end
-            self.w.unindent()
-            self.w.write("}\n")
-
-        for mesh in time_meshes:
-            bpy.data.meshes.remove(mesh)
-
-        return mesh_name
-
-
-    def export_surface_object(self, ob, group_prefix):
-        name = group_prefix + "__" + escape_name(ob.name)
-
-        # Collect time samples
-        time_surfaces = []
-        for i in range(self.time_samples):
-            # Check if render is cancelled
-            if self.render_engine.test_break():
-                raise ExportCancelled()
-            self.set_frame(self.fr, self.shutter_start + (self.shutter_diff*i))
-            time_surfaces += [ob.data.copy()]
-
-        # Write patch
-        self.w.write("BicubicPatch $" + name + " {\n")
-        self.w.indent()
-        for i in range(self.time_samples):
-            verts = time_surfaces[i].splines[0].points
-            vstr = ""
-            for v in verts:
-                vstr += ("%f %f %f " % (v.co[0], v.co[1], v.co[2]))
-            self.w.write("Vertices [%s]\n" % vstr[:-1])
-        for s in time_surfaces:
-            bpy.data.curves.remove(s)
-        self.w.unindent()
-        self.w.write("}\n")
-
-        return name
-
-
-    def export_sphere_lamp(self, ob, group_prefix):
-        name = group_prefix + "__" + escape_name(ob.name)
-
-        # Collect data over time
-        time_col = []
-        time_rad = []
-        for i in range(self.time_samples):
-            # Check if render is cancelled
-            if self.render_engine.test_break():
-                raise ExportCancelled()
-            self.set_frame(self.fr, self.shutter_start + (self.shutter_diff*i))
-            time_col += [ob.data.color * ob.data.energy]
-            time_rad += [ob.data.shadow_soft_size]
-
-        # Write out sphere light
-        self.w.write("SphereLight $%s {\n" % name)
-        self.w.indent()
-        for col in time_col:
-            self.w.write("Color [%f %f %f]\n" % (col[0], col[1], col[2]))
-        for rad in time_rad:
-            self.w.write("Radius [%f]\n" % rad)
-
-        self.w.unindent()
-        self.w.write("}\n")
-
-        return name
-
-    def export_area_lamp(self, ob, group_prefix):
-        name = group_prefix + "__" + escape_name(ob.name)
-
-        # Collect data over time
-        time_col = []
-        time_dim = []
-        for i in range(self.time_samples):
-            # Check if render is cancelled
-            if self.render_engine.test_break():
-                raise ExportCancelled()
-            self.set_frame(self.fr, self.shutter_start + (self.shutter_diff*i))
-            time_col += [ob.data.color * ob.data.energy]
-            if ob.data.shape == 'RECTANGLE':
-                time_dim += [(ob.data.size, ob.data.size_y)]
-            else:
-                time_dim += [(ob.data.size, ob.data.size)]
-
-
-        # Write out sphere light
-        self.w.write("RectangleLight $%s {\n" % name)
-        self.w.indent()
-        for col in time_col:
-            self.w.write("Color [%f %f %f]\n" % (col[0], col[1], col[2]))
-        for dim in time_dim:
-            self.w.write("Dimensions [%f %f]\n" % dim)
-
-        self.w.unindent()
-        self.w.write("}\n")
-
-        return name
-
     def export_world_distant_disk_lamp(self, ob, group_prefix):
         name = group_prefix + "__" + escape_name(ob.name)
 
diff --git a/psychoblend/render.py b/psychoblend/render.py
index f4b39e1..acb4b32 100644
--- a/psychoblend/render.py
+++ b/psychoblend/render.py
@@ -120,16 +120,20 @@ class PsychopathRender(bpy.types.RenderEngine):
                 self.update_stats("", "Psychopath: Not found")
                 return
 
-            self.update_stats("", "Psychopath: Exporting data from Blender")
+            self.update_stats("", "Psychopath: Collecting...")
             # Export to Psychopath's stdin
-            if not psy_export.PsychoExporter(self._process.stdin, self, scene).export_psy():
-                # Render cancelled in the middle of exporting,
-                # so just return.
-                return
-            self._process.stdin.write(bytes("__PSY_EOF__", "utf-8"))
-            self._process.stdin.flush()
+            try:
+                if not psy_export.PsychoExporter(self._process.stdin, self, scene).export_psy():
+                    # Render cancelled in the middle of exporting,
+                    # so just return.
+                    return
+                self._process.stdin.write(bytes("__PSY_EOF__", "utf-8"))
+                self._process.stdin.flush()
+            except:
+                self._process.terminate()
+                raise
 
-            self.update_stats("", "Psychopath: Rendering")
+            self.update_stats("", "Psychopath: Building")
         else:
             # Export to file
             self.update_stats("", "Psychopath: Exporting data from Blender")
@@ -189,6 +193,8 @@ class PsychopathRender(bpy.types.RenderEngine):
                 else:
                     continue
 
+            self.update_stats("", "Psychopath: Rendering")
+
             # Clear output buffer, since it's all in 'outputs' now.
             output = b""
 
diff --git a/psychoblend/util.py b/psychoblend/util.py
new file mode 100644
index 0000000..bd1721f
--- /dev/null
+++ b/psychoblend/util.py
@@ -0,0 +1,58 @@
+def mat2str(m):
+    """ Converts a matrix into a single-line string of values.
+    """
+    s = ""
+    for j in range(4):
+        for i in range(4):
+            s += (" %f" % m[i][j])
+    return s[1:]
+
+
+def needs_def_mb(ob):
+    """ Determines if the given object needs to be exported with
+        deformation motion blur or not.
+    """
+    for mod in ob.modifiers:
+        if mod.type == 'SUBSURF':
+            pass
+        elif mod.type == 'MIRROR':
+            if mod.mirror_object == None:
+                pass
+            else:
+                return True
+        else:
+            return True
+
+    if ob.type == 'MESH':
+        if ob.data.shape_keys == None:
+            pass
+        else:
+            return True
+
+    return False
+
+def escape_name(name):
+    name = name.replace("\\", "\\\\")
+    name = name.replace(" ", "\\ ")
+    name = name.replace("$", "\\$")
+    name = name.replace("[", "\\[")
+    name = name.replace("]", "\\]")
+    name = name.replace("{", "\\{")
+    name = name.replace("}", "\\}")
+    return name
+
+
+def needs_xform_mb(ob):
+    """ Determines if the given object needs to be exported with
+        transformation motion blur or not.
+    """
+    if ob.animation_data != None:
+        return True
+
+    if len(ob.constraints) > 0:
+        return True
+
+    if ob.parent != None:
+        return needs_xform_mb(ob.parent)
+
+    return False
\ No newline at end of file