/
ogre_xml_exporter.py
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/
ogre_xml_exporter.py
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### Info Block ####################################################################
bl_info = {
"name" : "Ogre XML Exporter",
"author" : "Karsten Hachmeister",
"blender" : (2,6,3),
"version" : (0,0,1),
"location" : "File > Import-Export",
"description" : "Export Ogre XML mesh format",
"category" : "Import-Export"
}
### Imports #######################################################################
import os, pprint
from xml.sax.saxutils import XMLGenerator
import bpy, mathutils
from bpy_extras.io_utils import ExportHelper
### SimpleSaxWriter ###############################################################
# borrowed from the blender2ogre project
# http://code.google.com/p/blender2ogre/
class SimpleSaxWriter():
def __init__(self, output, encoding, top_level_tag, attrs):
xml_writer = XMLGenerator(output, encoding, True)
xml_writer.startDocument()
xml_writer.startElement(top_level_tag, attrs)
self._xml_writer = xml_writer
self.top_level_tag = top_level_tag
self.ident=4
self._xml_writer.characters('\n')
def start_tag(self, name, attrs):
self._xml_writer.characters(" " * self.ident)
self._xml_writer.startElement(name, attrs)
self.ident += 4
self._xml_writer.characters('\n')
def end_tag(self, name):
self.ident -= 4
self._xml_writer.characters(" " * self.ident)
self._xml_writer.endElement(name)
self._xml_writer.characters('\n')
def leaf_tag(self, name, attrs):
self._xml_writer.characters(" " * self.ident)
self._xml_writer.startElement(name, attrs)
self._xml_writer.endElement(name)
self._xml_writer.characters('\n')
def close(self):
self._xml_writer.endElement(self.top_level_tag)
self._xml_writer.endDocument()
### Data structures ###############################################################
class Mesh:
def __init__(self):
self.sharedgeometry = None
self.submeshes = None
class Geometry:
def __init__(self):
self.vertexcount = 0
self.vertexbuffer_list = []
class Vertexbuffer:
def __init__(self):
self.positions = False
self.normals = False
self.colours_diffuse = False
self.colours_specular = False
self.vertex_list = {}
class Vertex:
def __init__(self):
self.position = None
self.normal = None
self.colour_diffuse = None
self.colour_specular = None
def __eq__(self, o):
if self.position != o.position or self.normal != o.normal:
return False
return True
class Vector3:
def __init__(self, x = 0.0, y = 0.0, z = 0.0):
self.x = x
self.y = y
self.z = z
def __eq__(self, o):
if self.x != o.x or self.y != o.y or self.z != o.z:
return False
return True
class Colour:
def __init__(self, value = ""):
self.value = value
class Submeshes:
def __init__(self):
self.submesh_list = []
class Submesh:
def __init__(self):
self.material = ''
self.usesharedvertices = True
self.use32bitindexes = False
self.faces = None
class Faces:
def __init__(self):
self.count = 0
self.face_list = []
class Face:
def __init__(self, v1 = 0, v2 = 0, v3 = 0):
self.v1 = v1
self.v2 = v2
self.v3 = v3
### Exporter class ################################################################
class ExportOgreXML(bpy.types.Operator, ExportHelper):
bl_idname = "mesh.xml"
bl_label = "Ogre XML Exporter"
bl_options = {'PRESET'}
filename_ext = ".xml"
def execute(self, context):
self.path = os.path.split(self.filepath)[0]
bpy.ops.object.mode_set(mode = 'OBJECT')
objects = bpy.context.selected_objects
for obj in objects:
if obj.type == 'MESH':
mesh = self.mesh(obj)
self.write_mesh(mesh, obj.name)
return {'FINISHED'};
def mesh(self, obj):
mesh = Mesh()
mesh.sharedgeometry = Geometry()
mesh.submeshes = Submeshes()
#obj.data.update(calc_tessface = True)
obj.data.calc_tessface()
obj.data.calc_normals()
# collect materials
materials = []
for m in obj.data.materials:
if m:
submesh = Submesh()
submesh.material = m.name
submesh.faces = Faces()
mesh.submeshes.submesh_list.append(submesh)
materials.append(m)
print(m.name)
# UV
dotextures = False
uvcache = []
if obj.data.tessface_uv_textures.active:
dotextures = True
# for layer in obj.data.tessface_uv_textures:
# uvs = []
# uvcache.append(uvs)
# for uvface in layer.data:
# uvs.append((uvface.uv1, uvface.uv2, uvface.uv3, uvface.uv4))
# create vertexbuffer
vbuf = Vertexbuffer()
vbuf.positions = True
vbuf.normals = True
# create faces
for f in obj.data.tessfaces:
submesh = mesh.submeshes.submesh_list[f.material_index]
faces = submesh.faces
face = self.add_face(f, f.vertices[0], f.vertices[1], f.vertices[2], obj, vbuf, mesh.sharedgeometry)
faces.face_list.append(face)
faces.count += 1
if len(f.vertices) > 3:
face = self.add_face(f, f.vertices[0], f.vertices[2], f.vertices[3], obj, vbuf, mesh.sharedgeometry)
faces.face_list.append(face)
faces.count += 1
mesh.sharedgeometry.vertexbuffer_list.append(vbuf)
return mesh
def add_face(self, face, v1, v2, v3, obj, vertexbuffer, sharedgeometry):
idx1 = self.add_vertex(obj.data.vertices[v1], face, vertexbuffer, sharedgeometry)
idx2 = self.add_vertex(obj.data.vertices[v2], face, vertexbuffer, sharedgeometry)
idx3 = self.add_vertex(obj.data.vertices[v3], face, vertexbuffer, sharedgeometry)
return Face(idx1, idx2, idx3)
def add_vertex(self, vertice, face, vertexbuffer, sharedgeometry):
vertex = Vertex()
x, y, z = swap(vertice.co)
vertex.position = Vector3(x, y, z)
if face.use_smooth:
nx, ny, nz = swap(vertice.normal)
else:
nx, ny, nz = swap(face.normal)
vertex.normal = Vector3(nx, ny, nz)
for idx in vertexbuffer.vertex_list:
if vertex == vertexbuffer.vertex_list[idx]:
return idx
idx = len(vertexbuffer.vertex_list)
vertexbuffer.vertex_list[idx] = vertex
sharedgeometry.vertexcount += 1
return idx
def write_mesh(self, mesh, name):
out = open(os.path.join(self.path, name + ".mesh.xml"), 'w')
doc = SimpleSaxWriter(out, 'UTF-8', "mesh", {})
self.write_geometry(doc, mesh.sharedgeometry)
self.write_submeshes(doc, mesh.submeshes)
doc.close()
out.close()
def write_geometry(self, doc, geometry):
doc.start_tag('sharedgeometry', {
'vertexcount' : val(geometry.vertexcount)
})
for vbuf in geometry.vertexbuffer_list:
self.write_vertexbuffer(doc, vbuf)
doc.end_tag('sharedgeometry')
def write_vertexbuffer(self, doc, vertexbuffer):
doc.start_tag('vertexbuffer', {
'positions' : val(vertexbuffer.positions),
'normals' : val(vertexbuffer.normals)
})
for idx in range(len(vertexbuffer.vertex_list)):
self.write_vertex(doc, vertexbuffer.vertex_list[idx])
doc.end_tag('vertexbuffer')
def write_vertex(self, doc, vertex):
doc.start_tag('vertex', {})
self.write_position(doc, vertex.position)
self.write_normal(doc, vertex.normal)
doc.end_tag('vertex')
def write_position(self, doc, position):
doc.leaf_tag('position', {
'x' : val(position.x),
'y' : val(position.y),
'z' : val(position.z)
})
def write_normal(self, doc, normal):
doc.leaf_tag('normal', {
'x' : val(normal.x),
'y' : val(normal.y),
'z' : val(normal.z)
})
def write_submeshes(self, doc, submeshes):
doc.start_tag('submeshes', {})
for submesh in submeshes.submesh_list:
self.write_submesh(doc, submesh)
doc.end_tag('submeshes')
def write_submesh(self, doc, submesh):
doc.start_tag('submesh', {
'material' : val(submesh.material),
'usesharedvertices' : val(submesh.usesharedvertices),
'use32bitindexes' : val(submesh.use32bitindexes)
})
self.write_faces(doc, submesh.faces)
doc.end_tag('submesh')
def write_faces(self, doc, faces):
doc.start_tag('faces', {
'count' : val(faces.count)
})
for face in faces.face_list:
self.write_face(doc, face)
doc.end_tag('faces')
def write_face(self, doc, face):
doc.leaf_tag('face', {
'v1' : val(face.v1),
'v2' : val(face.v2),
'v3' : val(face.v3)
})
### Help functions ################################################################
def val(value):
if isinstance(value, float):
return '%6.5f' % value
elif isinstance(value, bool):
return str(value).lower()
elif isinstance(value, int):
return str(value)
else:
return value
def swap(vec):
if len(vec) == 3:
return mathutils.Vector([vec.x, vec.z, -vec.y])
elif len(vec) == 4:
return mathutils.Quaternion([ vec.w, vec.x, vec.z, -vec.y])
### Register/Unregister functions #################################################
def menu_func(self, context):
self.layout.operator(ExportOgreXML.bl_idname, text = "Ogre XML (.xml)")
def register():
bpy.utils.register_module(__name__)
bpy.types.INFO_MT_file_export.append(menu_func)
def unregister():
bpy.utils.unregister_module(__name__)
bpy.types.INFO_MT_file_export.remove(menu_func)
### Main ##########################################################################
if __name__ == "__main__":
register()