/usr/share/pyshared/collada/polylist.py is in python-collada 0.4-2.
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# #
# THIS FILE IS PART OF THE pycollada LIBRARY SOURCE CODE. #
# USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS #
# GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE #
# IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. #
# #
# THE pycollada SOURCE CODE IS (C) COPYRIGHT 2011 #
# by Jeff Terrace and contributors #
# #
####################################################################
"""Module containing classes and functions for the <polylist> primitive."""
import numpy
from collada import primitive
from collada import triangleset
from collada.common import E, tag
from collada.common import DaeIncompleteError, DaeBrokenRefError, \
DaeMalformedError, DaeUnsupportedError
from collada.util import toUnitVec, checkSource, xrange
from collada.xmlutil import etree as ElementTree
class Polygon(object):
"""Single polygon representation. Represents a polygon of N points."""
def __init__(self, indices, vertices, normal_indices, normals, texcoord_indices, texcoords, material):
"""A Polygon should not be created manually."""
self.vertices = vertices
"""A (N, 3) float array containing the points in the polygon."""
self.normals = normals
"""A (N, 3) float array with the normals for points in the polygon. Can be None."""
self.texcoords = texcoords
"""A tuple where entries are numpy float arrays of size (N, 2) containing
the texture coordinates for the points in the polygon for each texture
coordinate set. Can be length 0 if there are no texture coordinates."""
self.material = material
"""If coming from an unbound :class:`collada.polylist.Polylist`, contains a
string with the material symbol. If coming from a bound
:class:`collada.polylist.BoundPolylist`, contains the actual
:class:`collada.material.Effect` the line is bound to."""
self.indices = indices
"""A (N,) int array containing the indices for the vertices
of the N points in the polygon."""
self.normal_indices = normal_indices
"""A (N,) int array containing the indices for the normals of
the N points in the polygon"""
self.texcoord_indices = texcoord_indices
"""A (N,2) int array with texture coordinate indexes for the
texcoords of the N points in the polygon"""
def triangles(self):
"""This triangulates the polygon using a simple fanning method.
:rtype: generator of :class:`collada.polylist.Polygon`
"""
npts = len(self.vertices)
for i in range(npts-2):
tri_indices = numpy.array([
self.indices[0], self.indices[i+1], self.indices[i+2]
], dtype=numpy.float32)
tri_vertices = numpy.array([
self.vertices[0], self.vertices[i+1], self.vertices[i+2]
], dtype=numpy.float32)
if self.normals is None:
tri_normals = None
normal_indices = None
else:
tri_normals = numpy.array([
self.normals[0], self.normals[i+1], self.normals[i+2]
], dtype=numpy.float32)
normal_indices = numpy.array([
self.normal_indices[0],
self.normal_indices[i+1],
self.normal_indices[i+2]
], dtype=numpy.float32)
tri_texcoords = []
tri_texcoord_indices = []
for texcoord, texcoord_indices in zip(
self.texcoords, self.texcoord_indices):
tri_texcoords.append(numpy.array([
texcoord[0],
texcoord[i+1],
texcoord[i+2]
], dtype=numpy.float32))
tri_texcoord_indices.append(numpy.array([
texcoord_indices[0],
texcoord_indices[i+1],
texcoord_indices[i+2]
], dtype=numpy.float32))
tri = triangleset.Triangle(
tri_indices, tri_vertices,
normal_indices, tri_normals,
tri_texcoord_indices, tri_texcoords,
self.material)
yield tri
def __repr__(self):
return '<Polygon vertices=%d>' % len(self.vertices)
def __str__(self):
return repr(self)
class Polylist(primitive.Primitive):
"""Class containing the data COLLADA puts in a <polylist> tag, a collection of
polygons. The Polylist object is read-only. To modify a Polylist, create a new
instance using :meth:`collada.geometry.Geometry.createPolylist`.
* If ``P`` is an instance of :class:`collada.polylist.Polylist`, then ``len(P)``
returns the number of polygons in the set. ``P[i]`` returns the i\ :sup:`th`
polygon in the set.
"""
def __init__(self, sources, material, index, vcounts, xmlnode=None):
"""A Polylist should not be created manually. Instead, call the
:meth:`collada.geometry.Geometry.createPolylist` method after
creating a geometry instance.
"""
if len(sources) == 0: raise DaeIncompleteError('A polylist set needs at least one input for vertex positions')
if not 'VERTEX' in sources: raise DaeIncompleteError('Polylist requires vertex input')
#find max offset
max_offset = max([ max([input[0] for input in input_type_array])
for input_type_array in sources.values() if len(input_type_array) > 0])
self.material = material
self.index = index
self.indices = self.index
self.nindices = max_offset + 1
self.vcounts = vcounts
self.sources = sources
self.index.shape = (-1, self.nindices)
self.npolygons = len(self.vcounts)
self.nvertices = numpy.sum(self.vcounts) if len(self.index) > 0 else 0
self.polyends = numpy.cumsum(self.vcounts)
self.polystarts = self.polyends - self.vcounts
self.polyindex = numpy.dstack((self.polystarts, self.polyends))[0]
if len(self.index) > 0:
self._vertex = sources['VERTEX'][0][4].data
self._vertex_index = self.index[:,sources['VERTEX'][0][0]]
self.maxvertexindex = numpy.max( self._vertex_index )
checkSource(sources['VERTEX'][0][4], ('X', 'Y', 'Z'), self.maxvertexindex)
else:
self._vertex = None
self._vertex_index = None
self.maxvertexindex = -1
if 'NORMAL' in sources and len(sources['NORMAL']) > 0 and len(self.index) > 0:
self._normal = sources['NORMAL'][0][4].data
self._normal_index = self.index[:,sources['NORMAL'][0][0]]
self.maxnormalindex = numpy.max( self._normal_index )
checkSource(sources['NORMAL'][0][4], ('X', 'Y', 'Z'), self.maxnormalindex)
else:
self._normal = None
self._normal_index = None
self.maxnormalindex = -1
if 'TEXCOORD' in sources and len(sources['TEXCOORD']) > 0 \
and len(self.index) > 0:
self._texcoordset = tuple([texinput[4].data
for texinput in sources['TEXCOORD']])
self._texcoord_indexset = tuple([ self.index[:,sources['TEXCOORD'][i][0]]
for i in xrange(len(sources['TEXCOORD'])) ])
self.maxtexcoordsetindex = [numpy.max(each)
for each in self._texcoord_indexset]
for i, texinput in enumerate(sources['TEXCOORD']):
checkSource(texinput[4], ('S', 'T'), self.maxtexcoordsetindex[i])
else:
self._texcoordset = tuple()
self._texcoord_indexset = tuple()
self.maxtexcoordsetindex = -1
if xmlnode is not None:
self.xmlnode = xmlnode
"""ElementTree representation of the line set."""
else:
txtindices = ' '.join(map(str, self.indices.flatten().tolist()))
acclen = len(self.indices)
self.xmlnode = E.polylist(count=str(self.npolygons),
material=self.material)
all_inputs = []
for semantic_list in self.sources.values():
all_inputs.extend(semantic_list)
for offset, semantic, sourceid, set, src in all_inputs:
inpnode = E.input(offset=str(offset), semantic=semantic,
source=sourceid)
if set is not None:
inpnode.set('set', str(set))
self.xmlnode.append(inpnode)
vcountnode = E.vcount(' '.join(map(str, self.vcounts)))
self.xmlnode.append(vcountnode)
self.xmlnode.append(E.p(txtindices))
def __len__(self):
return self.npolygons
def __getitem__(self, i):
polyrange = self.polyindex[i]
vertindex = self._vertex_index[polyrange[0]:polyrange[1]]
v = self._vertex[vertindex]
normalindex = None
if self.normal is None:
n = None
else:
normalindex = self._normal_index[polyrange[0]:polyrange[1]]
n = self._normal[normalindex]
uvindices = []
uv = []
for j, uvindex in enumerate(self._texcoord_indexset):
uvindices.append( uvindex[polyrange[0]:polyrange[1]] )
uv.append( self._texcoordset[j][ uvindex[polyrange[0]:polyrange[1]] ] )
return Polygon(vertindex, v, normalindex, n, uvindices, uv, self.material)
_triangleset = None
def triangleset(self):
"""This performs a simple triangulation of the polylist using the fanning method.
:rtype: :class:`collada.triangleset.TriangleSet`
"""
if self._triangleset is None:
indexselector = numpy.zeros(self.nvertices) == 0
indexselector[self.polyindex[:,1]-1] = False
indexselector[self.polyindex[:,1]-2] = False
indexselector = numpy.arange(self.nvertices)[indexselector]
firstpolyindex = numpy.arange(self.nvertices)
firstpolyindex = firstpolyindex - numpy.repeat(self.polyends - self.vcounts, self.vcounts)
firstpolyindex = firstpolyindex[indexselector]
if len(self.index) > 0:
triindex = numpy.dstack( (self.index[indexselector-firstpolyindex],
self.index[indexselector+1],
self.index[indexselector+2]) )
triindex = numpy.swapaxes(triindex, 1,2).flatten()
else:
triindex = numpy.array([], dtype=self.index.dtype)
triset = triangleset.TriangleSet(self.sources, self.material, triindex, self.xmlnode)
self._triangleset = triset
return self._triangleset
@staticmethod
def load( collada, localscope, node ):
indexnode = node.find(tag('p'))
if indexnode is None: raise DaeIncompleteError('Missing index in polylist')
vcountnode = node.find(tag('vcount'))
if vcountnode is None: raise DaeIncompleteError('Missing vcount in polylist')
try:
if vcountnode.text is None:
vcounts = numpy.array([], dtype=numpy.int32)
else:
vcounts = numpy.fromstring(vcountnode.text, dtype=numpy.int32, sep=' ')
vcounts[numpy.isnan(vcounts)] = 0
except ValueError as ex:
raise DaeMalformedError('Corrupted vcounts in polylist')
all_inputs = primitive.Primitive._getInputs(collada, localscope, node.findall(tag('input')))
try:
if indexnode.text is None:
index = numpy.array([], dtype=numpy.int32)
else:
index = numpy.fromstring(indexnode.text, dtype=numpy.int32, sep=' ')
index[numpy.isnan(index)] = 0
except: raise DaeMalformedError('Corrupted index in polylist')
polylist = Polylist(all_inputs, node.get('material'), index, vcounts, node)
return polylist
def bind(self, matrix, materialnodebysymbol):
"""Create a bound polylist from this polylist, transform and material mapping"""
return BoundPolylist( self, matrix, materialnodebysymbol)
def __str__(self):
return '<Polylist length=%d>' % len(self)
def __repr__(self):
return str(self)
class BoundPolylist(primitive.BoundPrimitive):
"""A polylist bound to a transform matrix and materials mapping.
* If ``P`` is an instance of :class:`collada.polylist.BoundPolylist`, then ``len(P)``
returns the number of polygons in the set. ``P[i]`` returns the i\ :sup:`th`
polygon in the set.
"""
def __init__(self, pl, matrix, materialnodebysymbol):
"""Create a bound polylist from a polylist, transform and material mapping.
This gets created when a polylist is instantiated in a scene. Do not create this manually."""
M = numpy.asmatrix(matrix).transpose()
self._vertex = None if pl._vertex is None else numpy.asarray(pl._vertex * M[:3,:3]) + matrix[:3,3]
self._normal = None if pl._normal is None else numpy.asarray(pl._normal * M[:3,:3])
self._texcoordset = pl._texcoordset
matnode = materialnodebysymbol.get( pl.material )
if matnode:
self.material = matnode.target
self.inputmap = dict([ (sem, (input_sem, set)) for sem, input_sem, set in matnode.inputs ])
else: self.inputmap = self.material = None
self.index = pl.index
self.nvertices = pl.nvertices
self._vertex_index = pl._vertex_index
self._normal_index = pl._normal_index
self._texcoord_indexset = pl._texcoord_indexset
self.polyindex = pl.polyindex
self.npolygons = pl.npolygons
self.matrix = matrix
self.materialnodebysymbol = materialnodebysymbol
self.original = pl
def __len__(self): return self.npolygons
def __getitem__(self, i):
polyrange = self.polyindex[i]
vertindex = self._vertex_index[polyrange[0]:polyrange[1]]
v = self._vertex[vertindex]
normalindex = None
if self.normal is None:
n = None
else:
normalindex = self._normal_index[polyrange[0]:polyrange[1]]
n = self._normal[normalindex]
uvindices = []
uv = []
for j, uvindex in enumerate(self._texcoord_indexset):
uvindices.append( uvindex[polyrange[0]:polyrange[1]] )
uv.append( self._texcoordset[j][ uvindex[polyrange[0]:polyrange[1]] ] )
return Polygon(vertindex, v, normalindex, n, uvindices, uv, self.material)
_triangleset = None
def triangleset(self):
"""This performs a simple triangulation of the polylist using the fanning method.
:rtype: :class:`collada.triangleset.BoundTriangleSet`
"""
if self._triangleset is None:
triset = self.original.triangleset()
boundtriset = triset.bind(self.matrix, self.materialnodebysymbol)
self._triangleset = boundtriset
return self._triangleset
def polygons(self):
"""Iterate through all the polygons contained in the set.
:rtype: generator of :class:`collada.polylist.Polygon`
"""
for i in xrange(self.npolygons): yield self[i]
def shapes(self):
"""Iterate through all the polygons contained in the set.
:rtype: generator of :class:`collada.polylist.Polygon`
"""
return self.polygons()
def __str__(self):
return '<BoundPolylist length=%d>' % len(self)
def __repr__(self):
return str(self)
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