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# The contents of this file are subject to the Mozilla Public License Version
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# The Original Code is the Python Computer Graphics Kit.
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# The Initial Developer of the Original Code is Matthias Baas.
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# $Id: lwobimport.py,v 1.1 2006/03/12 22:41:42 mbaas Exp $
import os.path, sys
from cgtypes import *
from worldobject import WorldObject
from trimesh import TriMesh
from trimeshgeom import TriMeshGeom
from polyhedron import Polyhedron
from polyhedrongeom import PolyhedronGeom
import pluginmanager
import cmds
from cgkit.all import UNIFORM,INT,GLMaterial
import lwob
class _LWOBReader(lwob.LWOBReader):
"""Read a Lightwave Object file (*.lwo).
"""
def __init__(self, parent=None):
lwob.LWOBReader.__init__(self)
# Parent node for the Lightwave object
self.parent = parent
# The TriMeshGeom that receives the triangle mesh
self.trimeshgeom = TriMeshGeom()
# The PolyhedronGeom that receives the mesh (if it is no triangle mesh)
self.polyhedrongeom = PolyhedronGeom()
# The generated WorldObject
self.worldobj = None
# The number of surfaces in the file
self.numsurfaces = 0
# A mapping from surface name to material id
# Key: Surface name / Value: Material id (0-based)
self.surface_ids = {}
# Message flags so that warning messages are only output once
self.crv_msg = False
self.patch_msg = False
def handlePNTS(self, points):
"""Handle the points chunk.
Stores the points in the TriMeshGeom.
"""
verts = self.trimeshgeom.verts
verts.resize(len(points))
for i,p in enumerate(points):
verts[i] = p
def handleSRFS(self, names):
"""Handle the surface names chunk.
"""
self.numsurfaces = len(names)
for i,n in enumerate(names):
self.surface_ids[n] = i
def handlePOLS(self, polys):
"""Handle the polygons.
This method creates the actual object. It is assumed that the
points have been read before and are stored in the TriMeshGeom.
It is also assumed that a SRFS chunk was present and numsurfaces
is initialized.
"""
# Assume the mesh is a triangle mesh and initialize the TriMeshGeom
# first. If this fails, use a PolyhedronGeom instead...
if self._initTriMesh(polys):
geom = self.trimeshgeom
else:
# Copy the vertices into the polyhedron geom...
numverts = self.trimeshgeom.verts.size()
self.polyhedrongeom.verts.resize(numverts)
self.trimeshgeom.verts.copyValues(0, numverts, self.polyhedrongeom.verts, 0)
del self.trimeshgeom
# Initialize the polys...
self._initPolyhedron(polys)
geom = self.polyhedrongeom
w = WorldObject(name="lwob", parent=self.parent)
w.setNumMaterials(self.numsurfaces)
w.geom = geom
self.worldobj = w
def _initPolyhedron(self, polys):
"""Initialize the polys of the PolyhedronGeom.
Sets the faces a poly mesh and adds a matid slot with the
material indices.
"""
geom = self.polyhedrongeom
geom.setNumPolys(len(polys))
geom.newVariable("matid", UNIFORM, INT)
matid = geom.slot("matid")
for i,(verts,surfid) in enumerate(polys):
geom.setLoop(i, 0, verts)
matid[i] = max(0, surfid-1)
def _initTriMesh(self, polys):
"""Initialize the faces of the TriMeshGeom.
Sets the faces of a triangle mesh and adds a matid slot with
the material indices.
If the mesh contains faces with more than 3 vertices the
method aborts and returns False.
"""
faces = self.trimeshgeom.faces
faces.resize(len(polys))
self.trimeshgeom.newVariable("matid", UNIFORM, INT)
matid = self.trimeshgeom.slot("matid")
for i,(verts,surfid) in enumerate(polys):
if len(verts)!=3:
self.trimeshgeom.deleteVariable("matid")
return False
faces[i] = verts
matid[i] = max(0, surfid-1)
return True
def handleCRVS(self, curves):
if not self.crv_msg:
print "Curves are not yet supported."
self.crv_msg = True
def handlePCHS(self, patches):
if not self.patch_msg:
print "Patches are not yet supported."
self.patch_msg = True
def handleSURF(self, surface):
"""Handle a surface chunk.
Currently this just creates a GLMaterial with the base color of
the surface. Everything else is ignored so far.
"""
if surface.name not in self.surface_ids:
raise lwob.LWOBError, 'Invalid surface name "%s" (name not available in SRFS chunk)'%surface.name
id = self.surface_ids[surface.name]
col = surface.color
if col==None:
col = (255,255,255)
mat = GLMaterial(diffuse=vec3(col)/255)
self.worldobj.setMaterial(mat, id)
# LWOBImporter
class LWOBImporter:
_protocols = ["Import"]
# extension
def extension():
"""Return the file extensions for this format."""
return ["lwo"]
extension = staticmethod(extension)
# description
def description(self):
"""Return a short description for the file dialog."""
return "Lightwave object file"
description = staticmethod(description)
# importFile
def importFile(self, filename, parent=None):
"""Import an LWOB file."""
f = file(filename, "rb")
reader = _LWOBReader(parent=parent)
reader.read(f)
f.close()
######################################################################
# Register the Importer class as a plugin class
pluginmanager.register(LWOBImporter)
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