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Python Open Source » Game 2D 3D » CGKit 
CGKit » cgkit 2.0.0alpha9 » cgkit » lwobimport.py
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is the Python Computer Graphics Kit.
#
# The Initial Developer of the Original Code is Matthias Baas.
# Portions created by the Initial Developer are Copyright (C) 2004
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****
# $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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