From 40020924ebc8b2a82b6f6cea3dc04561121cebfd Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 8 Oct 2010 18:28:50 +0000
Subject: [PATCH] Blender exporter: support exporting multiple objects as a
 single compound object

---
 mesh_export.py | 48 +++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 39 insertions(+), 9 deletions(-)

diff --git a/mesh_export.py b/mesh_export.py
index de11602c..4c18bb48 100644
--- a/mesh_export.py
+++ b/mesh_export.py
@@ -31,9 +31,6 @@ class Edge:
 	def __getattr__(self, attr):
 		return getattr(self._medge, attr)
 
-	def __cmp__(self, other):
-		return self is other
-
 	def check_smooth(self, limit):
 		if len(self.faces)!=2:
 			return
@@ -61,7 +58,6 @@ class Vertex:
 		else:
 			self._mvert = mv
 			self.uv = None
-		self.orig_index = self._mvert.index
 		self.flag = False
 		self.faces = []
 		self.tan = None
@@ -152,6 +148,7 @@ class Mesh:
 			smooth_limit = math.cos(m.degr*math.pi/180)
 		else:
 			smooth_limit = -1
+
 		for e in self.edges.itervalues():
 			e.v1 = self.verts[e.v1.index]
 			e.v2 = self.verts[e.v2.index]
@@ -160,6 +157,23 @@ class Mesh:
 	def __getattr__(self, attr):
 		return getattr(self._mesh, attr)
 
+	def splice(self, other):
+		offset = len(self.verts)
+		for v in other.verts:
+			v.index += offset
+			self.verts.append(v)
+
+		offset = len(self.faces)
+		for f in other.faces:
+			f.index += offset
+			self.faces.append(f)
+
+		for e in other.edges.itervalues():
+			e.key = make_edge_key(e.v1.index, e.v2.index)
+			self.edges[e.key] = e
+
+		self.lines += other.lines
+
 	def split_vertices(self, find_group_func, debug):
 		groups = []
 		for v in self.verts:
@@ -389,6 +403,7 @@ class Exporter:
 		self.cache_size = 64
 		self.export_lines = True
 		self.tbn_vecs = False
+		self.compound = False
 		self.debug = False
 		self.strip_debug = False
 		self.split_debug = False
@@ -499,13 +514,23 @@ class Exporter:
 	def export(self):
 		scene = bpy.data.scenes.active
 
-		obj = scene.objects.active
-		if obj.getType()!="Mesh":
-			raise Exception, "Can only export Mesh data"
+		objs = Blender.Object.GetSelected()
+		if not objs:
+			raise Exception, "Nothing to export"
+		for o in objs:
+			if o.getType()!="Mesh":
+				raise Exception, "Can only export Mesh data"
 
 		mesh = Blender.Mesh.New("export_tmp")
-		mesh.getFromObject(obj)
+		mesh.getFromObject(objs[0])
 		mesh = Mesh(mesh)
+		if self.compound:
+			bmeshes = []
+			for o in objs[1:]:
+				bmesh = Blender.Mesh.New("export_tmp")
+				bmesh.getFromObject(o)
+				bmeshes.append(bmesh)
+				mesh.splice(Mesh(bmesh))
 
 		if self.debug:
 			ntris = sum([len(f.verts)-2 for f in mesh.faces])
@@ -528,6 +553,7 @@ class Exporter:
 				mesh.compute_tbn()
 
 		strips = []
+		loose = mesh.faces
 		if self.use_strips:
 			strips, loose = self.stripify(mesh)
 
@@ -596,6 +622,7 @@ class FrontEnd:
 		self.cache_size = Blender.Draw.Create(self.config.get('cache_size', 64))
 		self.export_lines = Blender.Draw.Create(self.config.get('export_lines', False))
 		self.tbn_vecs = Blender.Draw.Create(self.config.get('tbn_vecs', False))
+		self.compound = Blender.Draw.Create(self.config.get('compound', False))
 		self.debug = Blender.Draw.Create(self.config.get('debug', False))
 		self.strip_debug = Blender.Draw.Create(self.config.get('strip_debug', False))
 		self.split_debug = Blender.Draw.Create(self.config.get('split_debug', False))
@@ -607,13 +634,14 @@ class FrontEnd:
 				("Cache size", self.cache_size, 8, 1024, "Cache size to optimize for"),
 				("Export lines", self.export_lines, "Export lone edges as lines"),
 				("Compute T/B vecs", self.tbn_vecs, "Compute tangent/binormal vectors for bumpmapping"),
+				("Compound", self.compound, "Create a compound mesh of all selected objects"),
 				("Debugging options"),
 				("Debug", self.debug),
 				("Debug strips", self.strip_debug),
 				("Debug splitting", self.split_debug)])
 		if ret:
 			dirname = self.temp_config.get("dirname", Blender.sys.dirname(Blender.Get("filename")))
-			obj = bpy.data.scenes.active.objects.active
+			obj = Blender.Object.GetSelected()[0]
 			Blender.Window.FileSelector(self.export, "Export MSP GL mesh", "%s/%s.mesh"%(dirname, obj.name))
 
 	def draw(self):
@@ -627,6 +655,7 @@ class FrontEnd:
 		self.config['cache_size'] = self.cache_size.val
 		self.config['export_lines'] = self.export_lines.val
 		self.config['tbn_vecs'] = self.tbn_vecs.val
+		self.config['compound'] = self.compound.val
 		self.config['debug'] = self.debug.val
 		self.config['strip_debug'] = self.strip_debug.val
 		self.config['split_debug'] = self.split_debug.val
@@ -644,6 +673,7 @@ class FrontEnd:
 		exp.cache_size = self.cache_size.val
 		exp.export_lines = self.export_lines.val
 		exp.tbn_vecs = self.tbn_vecs.val
+		exp.compound = self.compound.val
 		exp.debug = self.debug.val
 		exp.strip_debug = self.strip_debug.val
 		exp.split_debug = self.split_debug.val
-- 
2.45.2