def __init__(self, symbol, target, inputs, xmlnode = None):
"""Creates a material node
:param str symbol:
The symbol within a geometry this material should be bound to
:param collada.material.Material target:
The material object being bound to
:param list inputs:
A list of tuples of the form ``(semantic, input_semantic, set)`` mapping
texcoords or other inputs to material input channels, e.g.
``('TEX0', 'TEXCOORD', '0')`` would map the effect parameter ``'TEX0'``
to the ``'TEXCOORD'`` semantic of the geometry, using texture coordinate
set ``0``.
:param xmlnode:
When loaded, the xmlnode it comes from
"""
self.symbol = symbol
"""The symbol within a geometry this material should be bound to"""
self.target = target
"""An object of type :class:`collada.material.Material` representing the material object being bound to"""
self.inputs = inputs
"""A list of tuples of the form ``(semantic, input_semantic, set)`` mapping
texcoords or other inputs to material input channels, e.g.
``('TEX0', 'TEXCOORD', '0')`` would map the effect parameter ``'TEX0'``
to the ``'TEXCOORD'`` semantic of the geometry, using texture coordinate
set ``0``."""
if xmlnode is not None:
self.xmlnode = xmlnode
"""ElementTree representation of the material node."""
else:
self.xmlnode = E.instance_material(
*[E.bind_vertex_input(semantic=sem, input_semantic=input_sem, input_set=set)
for sem, input_sem, set in self.inputs]
, **{'symbol': self.symbol, 'target':"#%s"%self.target.id} )
def save(self):
"""Saves the material node back to :attr:`xmlnode`"""
self.xmlnode.set('symbol', self.symbol)
self.xmlnode.set('target', "#%s"%self.target.id)
inputs_in = []
for i in self.xmlnode.findall( tag('bind_vertex_input') ):
input_tuple = ( i.get('semantic'), i.get('input_semantic'), i.get('input_set') )
if input_tuple not in self.inputs:
self.xmlnode.remove(i)
else:
inputs_in.append(input_tuple)
for i in self.inputs:
if i not in inputs_in:
self.xmlnode.append(E.bind_vertex_input(semantic=i[0], input_semantic=i[1], input_set=i[2]))
