Hi all,
I'm trying without success to read an input matrix attribute of my custom
node. Here an example of the method I'm using to read a matrix attribute
(this also prints the matrix contents and outputs the sum of its elements).
import maya.api.OpenMaya as om
def maya_useNewAPI():
pass
class Node(om.MPxNode):
nodeName = 'test'
nodeClass = 'general'
nodeId = om.MTypeId(0xeff)
aMatrix = om.MObject()
aOut = om.MObject()
def __init__(self):
om.MPxNode.__init__(self)
@staticmethod
def create():
return Node()
@staticmethod
def initialize():
tAttr = om.MFnTypedAttribute()
nAttr = om.MFnNumericAttribute()
Node.aMatrix = tAttr.create(
'matrix', 'mat', om.MFnMatrixData.kMatrix)
tAttr.readable = False
Node.addAttribute(Node.aMatrix)
Node.aOut = nAttr.create(
'out', 'o', om.MFnNumericData.kFloat, 0.0)
nAttr.writable = False
Node.addAttribute(Node.aOut)
Node.attributeAffects(Node.aMatrix, Node.aOut)
def compute(self, plug, data):
if plug == Node.aOut:
mat = data.inputValue(Node.aMatrix).asMatrix()
print mat
s = 0
for i in range(15):
print mat[i]
s += mat[i]
outHandle = data.outputValue(Node.aOut)
outHandle.setFloat(s)
data.setClean(plug)
# Plug-in initialization omitted
To me, this seems ok, but Maya does not appear to like it. In fact if I
connect the matrix attribute to a transform at the origin with zero
rotation, scale and shear, the matrix values are completely wrong:
(((6.92524e-310, 1.39063e-309, 2.3342e-312, 0), (3.95253e-322, 1.66006e-321,
3.32254e-316, 3.32813e-316), (2.52962e-321, 0, 1.39063e-309, 0), (
6.92524e-310, 1.39065e-309, 0, 1)))
6.92524378327e-310
1.39062872165e-309
2.33419537006e-312
0.0
3.95252516673e-322
1.66006057003e-321
3.32253771394e-316
3.32813251331e-316
2.52961610671e-321
0.0
1.39062872165e-309
0.0
6.92523883349e-310
1.39064994161e-309
0.0
What am I missing?
Thanks in advance,
Giulio
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