def _parseSegmentNurbs(node, segmentParams, xmlStateGroups):
evaluators = []
vertexEvaluator = None
normalEvaluator = None
needsNormals = False
segmentParams['cls'] = EvaluatorSegment
for child in list(node):
if child.tag != "nurb":
continue
target = child.get('target', 'vertex')
uKnot = [0.0]*4 + [1.0]*4
vKnot = [0.0]*4 + [1.0]*4
params = {}
for n in list(child):
if n.tag == "u":
uKnot = xmlFloatListC(n.get('knot'), uKnot)
elif n.tag == "v":
vKnot = xmlFloatListC(n.get('knot'), vKnot)
elif n.tag == "ctrls":
params['ctrls'] = _parseEvaluatorCtrls(n)
elif n.tag == "state":
xmlParseStateParam(n, params)
elif child.tag == "stateGroup":
xmlParseStateGroupParam(n, params, xmlStateGroups)
elif n.tag == "vertexParam":
xmlParseVertexParam( n, params , xmlStateGroups)
try:
params['ctrls'][0][0][0]
isCurve = False
except:
isCurve = True
params['tolerance'] = xmlFloat(child.get('tolerance'), 25.0)
if isCurve:
params['target'] = _curveTargets()[target]
params['knots'] = [uKnot]
nurbCls = NURBCurveEvaluator
else:
params['target'] = _patchTargets()[target]
params['knots'] = [uKnot, vKnot]
nurbCls = NURBPatchEvaluator
evaluator = nurbCls(params)
if target=="vertex" or target=="vertex4":
vertexEvaluator = evaluator
# curves dont need normals
needsNormals = not isCurve
if target=="normal":
normalEvaluator = evaluator
evaluators.append(evaluator)
if needsNormals and normalEvaluator==None and vertexEvaluator!=None:
vertexEvaluator.generateNormals = True
segmentParams['evaluators'] = evaluators
def _readParam(n, name, param):
param.min = xmlFloat(n.get('min'), 0.0)
param.max = xmlFloat(n.get('max'), 1.0)
param.steps = xmlInt(n.get('steps'), 20)
