X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=mesh_export.py;h=bafbf917e527eea2b7c7e230b2115dce987e4012;hb=80aac2618536baaa99b92629be6931363c49c4de;hp=0158bdbf9189d3cff6e2bedae25b8e040601d02b;hpb=926d77eb54f915a6620eb879a91c1c4bd0f06bbc;p=libs%2Fgl.git

diff --git a/mesh_export.py b/mesh_export.py
index 0158bdbf..bafbf917 100644
--- a/mesh_export.py
+++ b/mesh_export.py
@@ -14,9 +14,13 @@ import Blender
 
 class Edge:
 	def __init__(self, me):
-		self._medge=me
+		if me.__class__==Edge:
+			self._medge=me._medge
+			self.smooth=me.smooth
+		else:
+			self._medge=me
+			self.smooth=False
 		self.faces=[]
-		self.smooth=False
 
 	def __getattr__(self, attr):
 		return getattr(self._medge, attr)
@@ -43,8 +47,11 @@ class Vertex:
 	def __init__(self, mv):
 		if mv.__class__==Vertex:
 			self._mvert=mv._mvert
+			self.uv=mv.uv
 		else:
 			self._mvert=mv
+			self.uv=None
+		self.orig_index=self._mvert.index
 
 	def __getattr__(self, attr):
 		return getattr(self._mvert, attr)
@@ -69,6 +76,13 @@ class Face:
 			if flags[i] and not flags[(i+l-1)%l]:
 				return self.verts[i:]+self.verts[:i]
 
+	def get_edge(self, v1, v2):	
+		i1=v1.index
+		i2=v2.index
+		for e in self.edges:
+			if (e.v1.index==i1 or e.v1.index==i2) and (e.v2.index==i1 or e.v2.index==i2):
+				return e
+
 
 class SmoothGroup:
 	def __init__(self, index):
@@ -83,17 +97,66 @@ class SmoothGroup:
 				v=f.verts[i]
 				if v.index not in vert_map:
 					vt=Vertex(v)
-					vt.no=Blender.Mathutils.Vector(f.no)
+					vt.index=len(self.verts)
 					self.verts.append(vt)
+
 					vert_map[v.index]=vt
-					f.verts[i]=vt
+					vt.no=Blender.Mathutils.Vector(f.no)
 				else:
-					f.verts[i]=vert_map[v.index]
-					vert_map[v.index].no+=f.no
+					vt=vert_map[v.index]
+					vt.no+=f.no
+				f.verts[i]=vt
 
 		for v in self.verts:
 			v.no.normalize()
 
+	def separate_uv(self):
+		copies={}
+		for f in self.faces:
+			for i in range(len(f.verts)):
+				v=f.verts[i]
+				if not v.uv:
+					v.uv=f.uv[i]
+				elif f.uv[i]!=v.uv:
+					if v.index not in copies:
+						copies[v.index]=[]
+
+					vt=None
+					for w in copies[v.index]:
+						if w.uv==f.uv[i]:
+							vt=w
+							break
+
+					if not vt:
+						vt=Vertex(v)
+						vt.index=len(self.verts)
+						vt.uv=f.uv[i]
+						self.verts.append(vt)
+						copies[v.index].append(vt)
+
+					f.verts[i]=vt
+
+	def create_edges(self):
+		edge_map={}
+		for f in self.faces:
+			vert_map=dict([(v.orig_index, v) for v in f.verts])
+			for i in range(len(f.edges)):
+				v1=vert_map[f.edges[i].v1.index]
+				v2=vert_map[f.edges[i].v2.index]
+				key=tuple(sorted((v1.index, v2.index)))
+
+				if key in edge_map:
+					e=edge_map[key]
+				else:
+					e=Edge(f.edges[i])
+					edge_map[key]=e
+					e.v1=v1
+					e.v2=v2
+					e.key=key
+
+				f.edges[i]=e
+				e.faces.append(f)
+
 
 class Exporter:
 	def __init__(self, fn):
@@ -105,6 +168,7 @@ class Exporter:
 		self.use_strips=True
 		self.use_degen_tris=True
 		self.debug=False
+		self.strip_debug=False
 
 	def find_smooth_group(self, face, sg):
 		face.smooth_group=sg
@@ -131,17 +195,20 @@ class Exporter:
 		if not edge:
 			return None
 
-		if self.debug:
-			print "Starting strip from %s"%[v.index for v in face.verts]
+		if self.strip_debug:
+			print "Starting strip from %s, edge %s"%([v.index for v in face.verts], (edge.v1.index, edge.v2.index))
 
 		verts=face.get_vertices_from(edge.v1, edge.v2)
-		result=[verts[-2], verts[-1]]
+		if len(verts)==3:
+			result=[verts[-1], verts[0]]
+		else:
+			result=[verts[-2], verts[-1]]
 
 		while 1:
 			verts=face.get_vertices_from(*result[-2:])
 			k=len(result)%2
-			if self.debug:
-				print "  %d %s"%(len(result), [v.index for v in verts])
+			if self.strip_debug:
+				print "  Adding %s"%[v.index for v in verts]
 
 			face.flag=True
 			if len(verts)==4 and not k:
@@ -150,24 +217,28 @@ class Exporter:
 			if len(verts)==4 and k:
 				result.append(verts[3])
 
-			i1=result[-2].index
-			i2=result[-1].index
-			ekey=(min(i1, i2), max(i1, i2))
-			for e in face.edges:
-				if e.key==ekey:
-					edge=e
-					break
+			edge=face.get_edge(*result[-2:])
+
+			if self.strip_debug:
+				print "  Next edge is %s"%((edge.v1.index, edge.v2.index), )
 
 			next=edge.other_face(face)
 			if not next or next.smooth_group.index!=face.smooth_group.index or next.flag:
 				break
 			face=next
 
-		if self.debug:
+		if self.strip_debug:
 			print "  %s"%[v.index for v in result]
 
 		return result
 
+	def get_locality(self, strip):
+		total=0
+		for i in range(1, len(strip)):
+			if strip[i].index!=strip[i-1].index:
+				total+=1.0/(abs(strip[i].index-strip[i-1].index))
+		return total/len(strip)
+
 	def export(self):
 		scene=bpy.data.scenes.active
 
@@ -190,7 +261,8 @@ class Exporter:
 			e.check_smooth(smooth_limit)
 
 		if self.debug:
-			print "%d faces, %d edges"%(len(faces), len(edges))
+			ntris=sum([len(f.verts)-2 for f in faces])
+			print "%d faces (%d triangles), %d edges"%(len(faces), ntris, len(edges))
 
 		smooth_groups=[]
 		for f in faces:
@@ -201,28 +273,69 @@ class Exporter:
 
 		for sg in smooth_groups:
 			sg.find_vertices()
+			if mesh.faceUV:
+				sg.separate_uv()
+			sg.create_edges()
+
+		verts=[]
+		for sg in smooth_groups:
+			for v in sg.verts:
+				v.index=len(verts)
+				verts.append(v)
 
 		if self.debug:
-			print "%d smooth groups:"
+			print "%d smooth groups:"%len(smooth_groups)
 			for i in range(len(smooth_groups)):
 				sg=smooth_groups[i]
 				print "  %d: %d faces, %d vertices"%(i, len(sg.faces), len(sg.verts))
+			print "%d vertices total"%len(verts)
 
 		strips=[]
 		if self.use_strips:
-			for sg in smooth_groups:
-				for f in sg.faces:
-					if not f.flag:
-						strip=self.create_strip(f)
-						if strip:
-							strips.append(strip)
+			while 1:
+				best=5
+				face=None
+				for f in faces:
+					if f.flag:
+						continue
+					score=0
+					for e in f.edges:
+						other=e.other_face(f)
+						if other and other.smooth_group.index==f.smooth_group.index and not other.flag:
+							score+=1
+					if score>0 and score<best:
+						face=f
+						best=score
+				if not face:
+					break
+				strip=self.create_strip(face)
+				if strip:
+					strips.append(strip)
+
+			if self.debug:
+				print "%d strips:"%len(strips)
+				for i in range(len(strips)):
+					print "  %d: %d indices"%(i, len(strips[i]))
+				print "%d loose faces"%len([f for f in faces if not f.flag])
+				nind=sum([len(s) for s in strips])+sum([len(f.verts) for f in faces if not f.flag])
+				print "%d indices total"%nind
 
 			if self.use_degen_tris:
 				big_strip=[]
-				for s in strips:
+				while strips:
+					strip=None
+					if big_strip:
+						for i in range(len(strips)):
+							if strips[i][0].index==big_strip[-1].index:
+								strip=strips.pop(i)
+								break
+					if not strip:
+						strip=strips.pop(0)
 					if big_strip:
-						big_strip+=[big_strip[-1], s[0]]
-					big_strip+=s
+						if strip[0].index!=big_strip[-1].index:
+							big_strip+=[big_strip[-1]]
+						big_strip+=[strip[0]]
+					big_strip+=strip
 
 				for f in faces:
 					if not f.flag:
@@ -234,19 +347,42 @@ class Exporter:
 						f.flag=True
 
 				strips=[big_strip]
+				
+				if self.debug:
+					nind=len(big_strip)
+					print "Big strip has %d indices"%len(big_strip)
 
-		verts=[]
-		for sg in smooth_groups:
-			for v in sg.verts:
-				v.index=len(verts)
-				verts.append(v)
+		if self.debug:
+			print "%.2f vertices per triangle"%(float(nind)/ntris)
+			print "Locality before optimization: "+" ".join(["%.3f"%self.get_locality(s) for s in strips])
+
+		used=[False]*len(verts)
+		i=0
+		for s in strips:
+			for v in s:
+				if not used[v.index]:
+					used[v.index]=True
+					v.index=i
+					i+=1
+
+		verts.sort(cmp=lambda x,y: cmp(x.index, y.index))
+
+		if self.debug:
+			print "Locality after optimization: "+" ".join(["%.3f"%self.get_locality(s) for s in strips])
 
-		self.out_file.write("vertices NORMAL3_VERTEX3\n{\n")
+		self.out_file.write("vertices NORMAL3")
+		if mesh.faceUV:
+			self.out_file.write("_TEXCOORD2")
+		self.out_file.write("_VERTEX3\n{\n")
 		norm=None
+		uv=None
 		for v in verts:
 			if v.no!=norm:
 				self.out_file.write("\tnormal3 %f %f %f;\n"%tuple(v.no))
 				norm=v.no
+			if v.uv!=uv:
+				self.out_file.write("\ttexcoord2 %f %f;\n"%tuple(v.uv))
+				uv=v.uv
 			self.out_file.write("\tvertex3 %f %f %f;\n"%tuple(v.co))
 		self.out_file.write("};\n")
 		for s in strips:
@@ -279,6 +415,7 @@ class FrontEnd:
 	def export(self, fn):
 		exp=Exporter(fn)
 		#exp.use_degen_tris=False
+		#exp.debug=True
 		exp.export()