X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=blender%2Fio_mspgl%2Fmesh.py;h=91648d28e5b28b1ab6db369586b46d974b0c332e;hp=c3767bd9f18884718941977115da2d66f3a1a756;hb=HEAD;hpb=e55b081c9b9927168530fdf7fafcae5aed295569

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index c3767bd9..e4db4afb 100644
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -1,6 +1,6 @@
-import bpy
 import math
 import mathutils
+import itertools
 
 def make_edge_key(i1, i2):
 	return (min(i1, i2), max(i1, i2))
@@ -8,10 +8,8 @@ def make_edge_key(i1, i2):
 class Edge:
 	def __init__(self, edge):
 		if edge.__class__==Edge:
-			self._edge = edge._edge
 			self.smooth = edge.smooth
 		else:
-			self._edge = edge
 			self.smooth = False
 		if edge:
 			self.vertices = edge.vertices[:]
@@ -21,9 +19,6 @@ class Edge:
 			self.key = None
 		self.faces = []
 
-	def __getattr__(self, attr):
-		return getattr(self._edge, attr)
-
 	def check_smooth(self, limit):
 		if len(self.faces)!=2:
 			return
@@ -50,26 +45,20 @@ class Edge:
 class Vertex:
 	def __init__(self, vertex):
 		if vertex.__class__==Vertex:
-			self._vertex = vertex._vertex
 			self.uvs = vertex.uvs[:]
 			self.tan = vertex.tan
-			self.bino = vertex.bino
 		else:
-			self._vertex = vertex
 			self.uvs = []
 			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.color = None
 		self.flag = False
 		self.edges = []
 		self.faces = []
 		self.groups = vertex.groups[:]
 
-	def __getattr__(self, attr):
-		return getattr(self._vertex, attr)
-
 	def __cmp__(self, other):
 		if other is None:
 			return 1
@@ -77,27 +66,38 @@ class Vertex:
 
 
 class VertexGroup:
-	def __init__(self, group):
-		self._group = group
-		self.group = group.group
-		self.weight = group.weight
+	def __init__(self, *args):
+		if len(args)==2:
+			self.group = args[0]
+			self.weight = args[1]
+		elif len(args)==1 and args[0]:
+			self.group = group.group
+			self.weight = group.weight
+		else:
+			self.group = 0
+			self.weight = 0.0
+
 
-	def __getattr__(self, attr):
-		return getattr(self._group, attr)
+class Batch:
+	def __init__(self, pt):
+		self.primitive_type = pt
+		self.patch_size = 0
+		self.vertices = []
 
 
 class Face:
 	def __init__(self, face):
-		self._face = face
 		self.index = face.index
 		self.edges = []
+		self.edge_keys = face.edge_keys
 		self.vertices = face.vertices[:]
-		self.uvs = []
+		self.loop_indices = face.loop_indices
+		self.normal = face.normal
+		self.use_smooth = face.use_smooth
+		self.material_index = face.material_index
+		self.splat_mask = 0
 		self.flag = False
 
-	def __getattr__(self, attr):
-		return getattr(self._face, attr)
-
 	def __cmp__(self, other):
 		if other is None:
 			return 1
@@ -107,14 +107,10 @@ class Face:
 		n = self.vertices.index(v)
 		return [(n+i)%len(self.vertices) for i in range(len(self.vertices))]
 
-	def pivot_vertices(self, *vt):
-		flags = [(v in vt) for v in self.vertices]
-		l = len(self.vertices)
-		for i in range(l):
-			if flags[i] and not flags[(i+l-1)%l]:
-				return self.vertices[i:]+self.vertices[:i]
+	def get_loop_index(self, v):
+		return self.loop_indices[self.vertices.index(v)]
 
-	def get_edge(self, v1, v2):	
+	def get_edge(self, v1, v2):
 		key = make_edge_key(v1.index, v2.index)
 		for e in self.edges:
 			if e.key==key:
@@ -141,12 +137,11 @@ class Line:
 class UvLayer:
 	def __init__(self, arg):
 		if type(arg)==str:
-			self._layer = None
 			self.name = arg
+			self.uvs = []
 		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 arg.data]
 
 		self.unit = None
 		self.hidden = False
@@ -159,51 +154,84 @@ class UvLayer:
 			elif ext==".hidden":
 				self.hidden = True
 
-	def __getattr__(self, attr):
-		return getattr(self._layer, attr)
+
+class ColorLayer:
+	def __init__(self, l):
+		self.name = l.name
+		self.colors = [c.color[:] for c in l.data]
 
 
 class Mesh:
 	def __init__(self, mesh):
-		self._mesh = mesh
-
-		self.winding_test = mesh.winding_test
-		self.tbn_vecs = mesh.tbn_vecs
+		self.name = mesh.name
+
+		self.smoothing = mesh.smoothing
+		self.use_uv = mesh.use_uv
+		self.tangent_uvtex = mesh.tangent_uvtex
+		self.use_strips = mesh.use_strips
+		self.use_patches = mesh.use_patches
+		self.use_lines = mesh.use_lines
 		self.vertex_groups = mesh.vertex_groups
 
 		# Clone basic data
-		self.vertices = [Vertex(v) for v in self.vertices]
-		for v in self.vertices:
-			v.groups = [VertexGroup(g) for g in v.groups]
-
-		self.faces = [Face(f) for f in self.polygons]
-		self.edges = [Edge(e) for e in self.edges]
-		self.loops = self.loops[:]
-		self.materials = self.materials[:]
+		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]
+
+		self.faces = [Face(f) for f in mesh.polygons]
+		self.edges = [Edge(e) for e in mesh.edges]
+		self.loops = mesh.loops[:]
+		self.materials = mesh.materials[:]
+
+		self.use_auto_smooth = mesh.use_auto_smooth
+		self.auto_smooth_angle = mesh.auto_smooth_angle
+		self.max_groups_per_vertex = mesh.max_groups_per_vertex
+
+		# Check some material properties
+		from .material import Material
+		has_normal_maps = False
+		splat_material = None
+		for m in self.materials:
+			mat = Material(m)
+			for p in itertools.chain(mat.properties, *(s.properties for s in mat.sub_materials)):
+				if p.tex_keyword=="normal_map" and p.texture:
+					has_normal_maps = True
+					break
+			if mat.type=="splat":
+				splat_material = mat
 
 		# Clone only the desired UV layers
-		if self.use_uv=='NONE' or not self.uv_layers:
+		if mesh.use_uv=='NONE' or not mesh.uv_layers:
 			self.uv_layers = []
 		else:
-			self.uv_layers = [UvLayer(u) for u in self.uv_layers]
-			self.uv_layers = sorted([u for u in self.uv_layers if not u.hidden], key=(lambda u: (u.unit or 1000, u.name)))
+			self.uv_layers = [UvLayer(u) for u in mesh.uv_layers if u.data]
+
+			# Assign texture unit numbers to UV layers that lack one
+			missing_unit = [u for u in self.uv_layers if u.unit is None]
+			if missing_unit:
+				missing_unit = sorted(missing_unit, key=(lambda u: u.name))
+				used_units = [u.unit for u in self.uv_layers if u.unit is not None]
+				for u, n in zip(missing_unit, (i for i in itertools.count() if i not in used_units)):
+					u.unit = n
 
-			if self.use_uv=='UNIT0':
+			self.uv_layers = sorted(self.uv_layers, key=(lambda u: u.unit))
+
+			if mesh.use_uv=='UNIT0' and self.uv_layers:
 				self.uv_layers = [self.uv_layers[0]]
+				if self.uv_layers[0].unit!=0:
+					self.uv_layers = []
 
-			# Assign texture unit numbers to UV layers that lack one
-			next_unit = max((u.unit+1 for u in self.uv_layers if u.unit is not None), default=0)
-			for u in self.uv_layers:
-				if not u.unit:
-					u.unit = next_unit
-					next_unit += 1
+		self.colors = None
+		if mesh.vertex_colors and not splat_material:
+			self.colors = ColorLayer(mesh.vertex_colors[0])
 
 		# Rewrite links between elements to point to cloned data, or create links
 		# where they don't exist
 		edge_map = {e.key: e for e in self.edges}
 		for f in self.faces:
-			if len(f.vertices)>4:
-				raise ValueError("Ngons are not supported")
+			if len(f.vertices)>4 and not mesh.use.patches:
+				raise ValueError("Unsupported face on mesh {}: N-gon".format(self.name))
 
 			f.vertices = [self.vertices[i] for i in f.vertices]
 			for v in f.vertices:
@@ -220,35 +248,57 @@ class Mesh:
 				v.edges.append(e)
 
 		# Store loose edges as lines
-		if self.use_lines:
+		if mesh.use_lines and not mesh.use_patches:
 			self.lines = [Line(e) for e in self.edges if not e.faces]
 		else:
 			self.lines = []
 
-		self.vertex_sequence = []
+		# Check if tangent vectors are needed
+		if mesh.tangent_vecs=='NO':
+			self.tangent_vecs = False
+		elif mesh.tangent_vecs=='YES':
+			self.tangent_vecs = True
+		elif mesh.tangent_vecs=='AUTO':
+			self.tangent_vecs = has_normal_maps
+
+		# Collect splat weight sources if needed
+		self.splat_layers = []
+		self.splat_sources = []
+		if splat_material:
+			names = {s.weight_source[0] for s in splat_material.sub_materials}
+			self.splat_layers = [ColorLayer(l) for l in mesh.vertex_colors if l.name in names]
+
+			layers_by_name = {l.name:l for l in self.splat_layers}
+			for s in splat_material.sub_materials:
+				if s.weight_source[0] is None:
+					self.splat_sources.append((None, None))
+				else:
+					self.splat_sources.append((layers_by_name[s.weight_source[0]], "RGBA".index(s.weight_source[1])))
+
+			self.vertex_groups = True
+			self.max_groups_per_vertex = 3
 
-	def __getattr__(self, attr):
-		return getattr(self._mesh, attr)
+		self.batches = []
 
 	def transform(self, matrix):
 		for v in self.vertices:
-			v.co = matrix*v.co
+			v.co = matrix@v.co
 
 	def splice(self, other):
 		if len(self.uv_layers)!=len(other.uv_layers):
-			raise ValueError("Meshes have incompatible UV layers")
+			raise ValueError("Meshes {} and {} have incompatible UV layers".format(self.name, other.name))
 		for i, u in enumerate(self.uv_layers):
 			if u.name!=other.uv_layers[i].name:
-				raise ValueError("Meshes have incompatible UV layers")
+				raise ValueError("Meshes {} and {} have incompatible UV layers".format(self.name, other.name))
 
 		# Merge materials and form a lookup from source material indices to the
 		# merged material list
-		material_map = []
+		material_lookup = []
 		for m in other.materials:
 			if m in self.materials:
-				material_map.append(self.materials.index(m))
+				material_lookup.append(self.materials.index(m))
 			else:
-				material_map.append(len(self.materials))
+				material_lookup.append(len(self.materials))
 				self.materials.append(m)
 
 		# Append data and adjust indices where necessary.  Since the data is
@@ -256,6 +306,15 @@ class Mesh:
 		for i, u in enumerate(self.uv_layers):
 			u.uvs += other.uv_layers[i].uvs
 
+		if self.colors:
+			if other.colors:
+				self.colors.colors += other.colors.colors
+			else:
+				self.colors.colors += [(1.0, 1.0, 1.0, 1.0)]*len(other.loops)
+		elif other.colors:
+			self.colors = ColorLayer(other.colors.name)
+			self.colors.colors = [(1.0, 1.0, 1.0, 1.0)]*len(self.loops)+other.colors.colors
+
 		offset = len(self.vertices)
 		self.vertices += other.vertices
 		for v in self.vertices[offset:]:
@@ -268,10 +327,9 @@ class Mesh:
 		self.faces += other.faces
 		for f in self.faces[offset:]:
 			f.index += offset
-			f.loop_start += loop_offset
-			f.loop_indices = range(f.loop_start, f.loop_start+f.loop_total)
+			f.loop_indices = range(f.loop_indices.start+offset, f.loop_indices.stop+offset)
 			if other.materials:
-				f.material_index = material_map[f.material_index]
+				f.material_index = material_lookup[f.material_index]
 
 		offset = len(self.edges)
 		self.edges += other.edges
@@ -281,7 +339,10 @@ class Mesh:
 
 		self.lines += other.lines
 
-	def prepare_triangles(self, progress):
+	def prepare_triangles(self, task):
+		if self.use_patches:
+			return
+
 		face_count = len(self.faces)
 		for i in range(face_count):
 			f = self.faces[i]
@@ -341,9 +402,9 @@ class Mesh:
 			f.normal = normals[1-cut_index]
 			nf.normal = normals[3-cut_index]
 
-			progress.set_progress(i/face_count)
+			task.set_progress(i/face_count)
 
-	def prepare_smoothing(self, progress):
+	def prepare_smoothing(self, task):
 		smooth_limit = -1
 		if self.smoothing=='NONE':
 			for f in self.faces:
@@ -356,16 +417,17 @@ class Mesh:
 		for e in self.edges:
 			e.check_smooth(smooth_limit)
 
-		progress.push_task("Sharp edges", 0.0, 0.7)
-		self.split_vertices(self.find_smooth_group, progress)
+		subtask = task.task("Sharp edges", 0.7)
+		self.split_vertices(self.find_smooth_group, subtask)
 
 		if self.smoothing!='BLENDER':
-			progress.set_task("Updating normals", 0.7, 1.0)
-			self.compute_normals(progress)
-
-		progress.pop_task()
+			subtask = task.task("Updating normals", 1.0)
+			self.compute_normals(subtask)
 
 	def prepare_vertex_groups(self, obj):
+		if not self.vertex_groups:
+			return
+
 		for v in self.vertices:
 			if v.groups:
 				weight_sum = sum(g.weight for g in v.groups)
@@ -373,6 +435,8 @@ class Mesh:
 				weight_scale = weight_sum/sum(g.weight for g in v.groups)
 				for g in v.groups:
 					g.weight *= weight_scale
+			while len(v.groups)<self.max_groups_per_vertex:
+				v.groups.append(VertexGroup(None))
 
 		if obj.parent and obj.parent.type=="ARMATURE":
 			armature = obj.parent.data
@@ -386,26 +450,10 @@ class Mesh:
 				for g in v.groups:
 					g.group = group_index_map[g.group]
 
-	def prepare_uv(self, obj, progress):
-		if obj.material_tex and self.use_uv!='NONE':
-			layer = UvLayer("material_tex")
-
-			if self.use_uv=='UNIT0':
-				self.uv_layers = [layer]
-				layer.unit = 0
-			else:
-				self.uv_layers.append(layer)
-				layer.unit = max((u.unit+1 for u in self.uv_layers if u.unit is not None), default=0)
-
-			layer.uvs = [None]*len(self.loops)
-			for f in self.faces:
-				uv = mathutils.Vector(((f.material_index+0.5)/len(self.materials), 0.5))
-				for i in f.loop_indices:
-					layer.uvs[i] = uv
-
+	def prepare_uv(self, task):
 		# Form a list of UV layers referenced by materials with the array atlas
 		# property set
-		array_uv_layers = [t.uv_layer for m in self.materials if m.array_atlas for t in m.texture_slots if t and t.texture_coords=='UV']
+		array_uv_layers = [] #[t.uv_layer for m in self.materials if m.array_atlas for t in m.texture_slots if t and t.texture_coords=='UV']
 		array_uv_layers = [u for u in self.uv_layers if u.name in array_uv_layers]
 
 		if array_uv_layers:
@@ -420,50 +468,100 @@ class Mesh:
 					for i in f.loop_indices:
 						l.uvs[i] = mathutils.Vector((*l.uvs[i], layer))
 
-		# Copy UVs from layers to faces
-		for f in self.faces:
-			for u in self.uv_layers:
-				f.uvs.append([u.uvs[i] for i in f.loop_indices])
+		# Split by the UV layer used for tangent vectors first so connectivity
+		# remains intact for tangent vector computation
+		tangent_layer_index = -1
+		if self.tangent_vecs:
+			if self.tangent_uvtex:
+				uv_names = [u.name for u in self.uv_layers]
+				if self.tangent_uvtex in uv_names:
+					tangent_layer_index = uv_names.index(self.tangent_uvtex)
+			elif self.uv_layers[0].unit==0:
+				tangent_layer_index = 0
+
+			if tangent_layer_index<0:
+				raise Exception("Invalid configuration on mesh {}: No tangent UV layer".format(self.name))
 
 		prog_count = len(self.uv_layers)
-		prog_step = 0
-
-		# Split by the UV layer used for TBN vectors first so connectivity
-		# remains intact for TBN vector computation
-		tbn_layer_index = -1
-		if self.tbn_vecs:
-			uv_names = [u.name for u in self.uv_layers]
-			if self.tbn_uvtex in uv_names:
-				prog_count += 1
-				tbn_layer_index = uv_names.index(self.tbn_uvtex)
-				progress.push_task_slice("Computing TBN", 0, prog_count)
-				self.split_vertices(self.find_uv_group, progress, tbn_layer_index)
-				progress.set_task_slice(self.tbn_uvtex, 1, prog_count)
-				self.compute_tbn(tbn_layer_index, progress)
-				progress.pop_task()
-				prog_step = 2
+		if tangent_layer_index>=0:
+			prog_count += 1
+		task.set_slices(prog_count)
+
+		if tangent_layer_index>=0:
+			subtask = task.next_slice("Computing tangents")
+			self.split_vertices(self.find_uv_group, subtask, tangent_layer_index)
+			subtask = task.next_slice(self.tangent_uvtex)
+			self.compute_tangents(tangent_layer_index, subtask)
 
 		# Split by the remaining UV layers
 		for i, u in enumerate(self.uv_layers):
-			if i==tbn_layer_index:
+			if i==tangent_layer_index:
 				continue
 
-			progress.push_task_slice(u.name, prog_step, prog_count)
-			self.split_vertices(self.find_uv_group, progress, i)
-			progress.pop_task()
-			prog_step += 1
+			subtask = task.next_slice(u.name)
+			self.split_vertices(self.find_uv_group, subtask, i)
 
-		# Copy UVs from faces to vertices
+		# Copy UVs from layers to vertices
 		for v in self.vertices:
 			if v.faces:
 				# All faces still connected to the vertex have the same UV value
 				f = v.faces[0]
-				i = f.vertices.index(v)
-				v.uvs = [u[i] for u in f.uvs]
+				i = f.get_loop_index(v)
+				v.uvs = [u.uvs[i] for u in self.uv_layers]
 			else:
 				v.uvs = [(0.0, 0.0)]*len(self.uv_layers)
 
-	def split_vertices(self, find_group_func, progress, *args):
+	def prepare_colors(self, task):
+		if not self.colors:
+			return
+
+		self.split_vertices(self.find_color_group, task)
+
+		for v in self.vertices:
+			if v.faces:
+				f = v.faces[0]
+				v.color = self.colors.colors[f.get_loop_index(v)]
+			else:
+				v.color = (1.0, 1.0, 1.0, 1.0)
+
+	def prepare_splat_weights(self, task):
+		if not self.splat_layers:
+			return
+
+		splat_weights = []
+		remainder = None
+		for s in self.splat_sources:
+			if s[0] is None:
+				splat_weights.append(remainder)
+			else:
+				index = s[1]
+				layer_values = [c[index] for c in s[0].colors]
+				if remainder:
+					splat_weights.append([v*r for v, r in zip(layer_values, remainder)])
+					remainder = [(1-v)*r for v, r in zip(layer_values, remainder)]
+				else:
+					splat_weights.append(layer_values)
+					remainder = [1-v for v in layer_values]
+
+		splat_weights = list(zip(*splat_weights))
+
+		for f in self.faces:
+			for i in f.loop_indices:
+				f.splat_mask |= sum(1<<j for j, w in enumerate(splat_weights[i]) if w>0)
+
+		self.split_vertices(self.find_splat_group, task)
+
+		for v in self.vertices:
+			if v.faces:
+				f = v.faces[0]
+				weights = splat_weights[f.get_loop_index(v)]
+				v.groups = [VertexGroup(i, w) for i, w in enumerate(weights) if (f.splat_mask>>i)&1]
+			else:
+				v.groups = []
+			while len(v.groups)<self.max_groups_per_vertex:
+				v.groups.append(VertexGroup(None))
+
+	def split_vertices(self, find_group_func, task, *args):
 		vertex_count = len(self.vertices)
 		for i in range(vertex_count):
 			v = self.vertices[i]
@@ -515,7 +613,7 @@ class Mesh:
 					f.vertices[f.vertices.index(v)] = nv
 					nv.faces.append(f)
 
-			progress.set_progress(i/vertex_count)
+			task.set_progress(i/vertex_count)
 
 	def find_smooth_group(self, vertex, face):
 		face.flag = True
@@ -537,24 +635,48 @@ class Mesh:
 		return group
 
 	def find_uv_group(self, vertex, face, index):
-		uv = face.uvs[index][face.vertices.index(vertex)]
+		layer = self.uv_layers[index]
+		uv = layer.uvs[face.get_loop_index(vertex)]
 		face.flag = True
 
 		group = [face]
 		for f in vertex.faces:
-			if not f.flag and f.uvs[index][f.vertices.index(vertex)]==uv:
+			if not f.flag and layer.uvs[f.get_loop_index(vertex)]==uv:
 				f.flag = True
 				group.append(f)
 
 		return group
 
-	def compute_normals(self, progress):
+	def find_color_group(self, vertex, face):
+		color = self.colors.colors[face.get_loop_index(vertex)]
+		face.flag = True
+
+		group = [face]
+		for f in vertex.faces:
+			if not f.flag and self.colors.colors[f.get_loop_index(vertex)]==color:
+				f.flag = True
+				group.append(f)
+
+		return group
+
+	def find_splat_group(self, vertex, face):
+		face.flag = True
+
+		group = [face]
+		for f in vertex.faces:
+			if not f.flag and f.splat_mask==face.splat_mask:
+				f.flag = True
+				group.append(f)
+
+		return group
+
+	def compute_normals(self, task):
 		for i, v in enumerate(self.vertices):
 			v.normal = mathutils.Vector()
 			for f in v.faces:
-				fv = f.pivot_vertices(v)
-				edge1 = fv[1].co-fv[0].co
-				edge2 = fv[-1].co-fv[0].co
+				vi = f.pivot_vertex(v)
+				edge1 = f.vertices[vi[1]].co-v.co
+				edge2 = f.vertices[vi[-1]].co-v.co
 				if edge1.length and edge2.length:
 					# Use the angle between edges as a weighting factor.  This gives
 					# more consistent normals on bends with an inequal number of
@@ -566,16 +688,13 @@ class Mesh:
 			else:
 				v.normal = mathutils.Vector((0, 0, 1))
 
-			progress.set_progress(i/len(self.vertices))
+			task.set_progress(i/len(self.vertices))
 
-	def compute_tbn(self, index, progress):
-		# This function is called at an early stage during UV preparation when
-		# face UVs are not available yet
+	def compute_tangents(self, index, task):
 		layer_uvs = self.uv_layers[index].uvs
 
 		for i, v in enumerate(self.vertices):
 			v.tan = mathutils.Vector()
-			v.bino = mathutils.Vector()
 			for f in v.faces:
 				vi = f.pivot_vertex(v)
 				uv0 = layer_uvs[f.loop_indices[vi[0]]]
@@ -591,20 +710,35 @@ class Mesh:
 				if div:
 					mul = edge1.angle(edge2)/div
 					v.tan += (edge1*dv2-edge2*dv1)*mul
-					v.bino += (edge2*du1-edge1*du2)*mul
 
 			if v.tan.length:
 				v.tan.normalize()
-			if v.bino.length:
-				v.bino.normalize()
 
-			progress.set_progress(i/len(self.vertices))
+			task.set_progress(i/len(self.vertices))
+
+	def prepare_sequence(self, task):
+		if self.use_patches:
+			subtask = task.task("Reordering patches", 0.5)
+			self.reorder_patches(subtask)
+
+			subtask = task.task("Building sequence", 1.0)
+			self.build_patch_sequence(subtask)
+		else:
+			subtask = task.task("Reordering faces", 0.5)
+			self.reorder_faces(subtask)
+
+			subtask = task.task("Building sequence", 1.0)
+			if self.use_strips:
+				self.build_tristrip_sequence(subtask)
+			else:
+				self.build_triangle_sequence(subtask)
+
+			if self.use_lines:
+				self.build_line_sequence()
 
-	def prepare_sequence(self, progress):
-		progress.push_task("Reordering faces", 0.0, 0.5)
-		self.reorder_faces(progress)
+		self.reorder_vertices()
 
-		progress.set_task("Building sequence", 0.5, 1.0)
+	def build_tristrip_sequence(self, task):
 		sequence = None
 		for i, f in enumerate(self.faces):
 			if sequence:
@@ -628,16 +762,37 @@ class Mesh:
 					sequence += to_add
 
 			if not sequence:
-				sequence = f.vertices[:]
-				self.vertex_sequence.append(sequence)
+				self.batches.append(Batch("TRIANGLE_STRIP"))
+				sequence = self.batches[-1].vertices
+				sequence += f.vertices
 
-			progress.set_progress(i/len(self.faces))
+			task.set_progress(i/len(self.faces))
 
-		progress.pop_task()
+	def build_triangle_sequence(self, task):
+		batch = Batch("TRIANGLES")
+		for f in self.faces:
+			batch.vertices += f.vertices
+		self.batches.append(batch)
 
-		self.reorder_vertices()
+	def build_line_sequence(self):
+		batch = Batch("LINES")
+		for l in self.lines:
+			batch.vertices += l.vertices
+		self.batches.append(batch)
 
-	def reorder_faces(self, progress):
+	def build_patch_sequence(self, task):
+		current_size = 0
+		sequence = None
+		for f in self.faces:
+			if len(f.vertices)!=current_size:
+				current_size = len(f.vertices)
+				self.batches.append(Batch("PATCHES"))
+				self.batches[-1].patch_size = current_size
+				sequence = self.batches[-1].vertices
+
+			sequence += f.vertices
+
+	def reorder_faces(self, task):
 		# Tom Forsyth's vertex cache optimization algorithm
 		# http://eelpi.gotdns.org/papers/fast_vert_cache_opt.html
 
@@ -655,7 +810,8 @@ class Mesh:
 		# Keep track of the score and number of unused faces for each vertex
 		vertex_info = [[0, len(v.faces)] for v in self.vertices]
 		for vi in vertex_info:
-			vi[0] = valence_boost_scale*(vi[1]**valence_boost_power)
+			if vi[1]:
+				vi[0] = valence_boost_scale*(vi[1]**valence_boost_power)
 
 		face = None
 		reordered_faces = []
@@ -713,47 +869,67 @@ class Mesh:
 			del cached_vertices[max_cache_size:]
 
 			n_processed += 1
-			progress.set_progress(n_processed/len(self.faces))
+			task.set_progress(n_processed/len(self.faces))
 
 		self.faces = reordered_faces
 		for i, f in enumerate(self.faces):
 			f.index = i
 
+	def reorder_patches(self, task):
+		for f in self.faces:
+			f.flag = False
+
+		reordered_faces = []
+		n_processed = 0
+
+		while 1:
+			current_size = 0
+
+			for f in self.faces:
+				if f.flag:
+					continue
+
+				if not current_size:
+					current_size = len(f.vertices)
+				elif len(f.vertices)!=current_size:
+					continue
+
+				reordered_faces.append(f)
+				f.flag = True
+
+				n_processed += 1
+				task.set_progress(n_processed/len(self.faces))
+
+			if not current_size:
+				break
+
 	def reorder_vertices(self):
 		for v in self.vertices:
 			v.index = -1
 
 		reordered_vertices = []
-		for s in self.vertex_sequence:
-			for v in s:
+		for b in self.batches:
+			for v in b.vertices:
 				if v.index<0:
 					v.index = len(reordered_vertices)
 					reordered_vertices.append(v)
 
+		for v in self.vertices:
+			if v.index<0:
+				v.index = len(reordered_vertices)
+				reordered_vertices.append(v)
+
 		self.vertices = reordered_vertices
 
 		for e in self.edges:
 			e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 
-	def drop_references(self):
-		for v in self.vertices:
-			v._vertex = None
-			for g in v.groups:
-				g._group = None
-		for e in self.edges:
-			e._edge = None
-		for f in self.faces:
-			f._face = None
-		for u in self.uv_layers:
-			u._layer = None
-		self._mesh = None
 
-
-def create_mesh_from_object(context, obj, progress):
+def create_mesh_from_object(ctx, obj):
 	if obj.type!="MESH":
-		raise Exception("Object is not a mesh")
+		raise Exception("Object {} is not a mesh".format(obj.name))
 
-	progress.push_task("Preparing mesh", 0.0, 0.2)
+	task = ctx.task("Collecting mesh data", 0.2)
 
 	objs = [(obj, mathutils.Matrix())]
 	i = 0
@@ -764,47 +940,51 @@ def create_mesh_from_object(context, obj, progress):
 			if c.type=="MESH" and c.compound:
 				objs.append((c, m*c.matrix_local))
 
+	dg = ctx.context.evaluated_depsgraph_get()
+
 	mesh = None
-	bmeshes = []
 	for o, m in objs:
-		bmesh = o.to_mesh(context.scene, True, "PREVIEW")
-		bmeshes.append(bmesh)
+		eval_obj = o.evaluated_get(dg)
+		bmesh = eval_obj.to_mesh()
 
 		# Object.to_mesh does not copy custom properties
-		bmesh.winding_test = o.data.winding_test
 		bmesh.smoothing = o.data.smoothing
 		bmesh.use_lines = o.data.use_lines
 		bmesh.vertex_groups = o.data.vertex_groups
 		bmesh.max_groups_per_vertex = o.data.max_groups_per_vertex
 		bmesh.use_uv = o.data.use_uv
-		bmesh.tbn_vecs = o.data.tbn_vecs
-		bmesh.tbn_uvtex = o.data.tbn_uvtex
+		bmesh.tangent_vecs = o.data.tangent_vecs
+		bmesh.tangent_uvtex = o.data.tangent_uvtex
 
 		me = Mesh(bmesh)
 		me.transform(m)
 
+		for i, s in enumerate(eval_obj.material_slots):
+			if s.link=='OBJECT':
+				me.materials[i] = s.material
+
 		if mesh:
 			mesh.splice(me)
 		else:
 			mesh = me
 
-	progress.set_task("Triangulating", 0.2, 0.3)
-	mesh.prepare_triangles(progress)
-	progress.set_task("Smoothing", 0.3, 0.5)
-	mesh.prepare_smoothing(progress)
-	progress.set_task("Vertex groups", 0.5, 0.6)
-	mesh.prepare_vertex_groups(obj)
-	progress.set_task("Preparing UVs", 0.6, 0.8)
-	mesh.prepare_uv(obj, progress)
-	progress.set_task("Render sequence", 0.8, 1.0)
-	mesh.prepare_sequence(progress)
-
-	# Discard the temporary Blender meshes after making sure there's no
-	# references to the data
-	mesh.drop_references()
-	for m in bmeshes:
-		bpy.data.meshes.remove(m)
-
-	progress.pop_task()
+	mesh.name = obj.data.name
+
+	task = ctx.task("Triangulating", 0.3)
+	mesh.prepare_triangles(task)
+	task = ctx.task("Smoothing", 0.5)
+	mesh.prepare_smoothing(task)
+	if mesh.splat_sources:
+		task = ctx.task("Splat weights", 0.6)
+		mesh.prepare_splat_weights(task)
+	else:
+		task = ctx.task("Vertex groups", 0.6)
+		mesh.prepare_vertex_groups(obj)
+	task = ctx.task("Preparing UVs", 0.75)
+	mesh.prepare_uv(task)
+	task = ctx.task("Preparing vertex colors", 0.85)
+	mesh.prepare_colors(task)
+	task = ctx.task("Render sequence", 1.0)
+	mesh.prepare_sequence(task)
 
 	return mesh