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I'm working with OpenMaya and I need to get the Euler rotation from a matrix but i'm getting an error while I launch this simple code:

code:

import maya.OpenMaya as OpenMaya
import maya.cmds as mc
crcl=mc.circle()
matrx=(OpenMaya.MMatrix(mc.xform(crcl,q=1,m=1)))
tMat = OpenMaya.MTransformationMatrix(matrx)
eulerRotation = tMat.rotation(asQuaternion=False)

error

Error: in method 'new_MMatrix', argument 1 of type 'float const [4][4]'

the problem is the OpenMaya.MTransformationMatrix(matrx), looks like is not accepting my matrix. Any help?

MTransformationMatrix documentation

I'm sure is a simple fix that I'm missing

Matteo Turrisi
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1 Answers1

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One way to get the matrix is to avoid going through the MEL command and use the OpenMaya API directly.

import math
# I'm Using `maya.api.OpenMaya` here since I'm testing on Maya 2019.
# Change according to your version.
import maya.api.OpenMaya as OpenMaya
import maya.cmds as mc

crcl = mc.circle()
mc.rotate(45.0, 10.0, 5.0, crcl)

# Add the circle to the selection so we can retrieve its `MObject`.
selection = OpenMaya.MSelectionList()
selection.add(crcl[0])

# Get the circle `MObject` and create a `MFnDagNode` from it.
obj = selection.getDependNode(0)
dagNode = OpenMaya.MFnDagNode(obj)

matrix = dagNode.transformationMatrix()
tMat = OpenMaya.MTransformationMatrix(matrix)
eulerRotation = tMat.rotation(asQuaternion=False)

# This should print the following (only differences would potentially be in
# floating point accuracy):
# [45.0, 10.0, 5.0]
print(map(math.degrees, eulerRotation))
dms
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    That was very helpful! thanks, I manage to find the error on the code, I was using `maya.OpenMaya` instead of `maya.api.OpenMaya` in fact if you change just that part the code work! – Matteo Turrisi Aug 27 '21 at 08:08