View Full Version : trying to use the API in python.. again

02 February 2008, 11:28 AM

Once more I'm trying to use the Maya API via python .. and again I can't get it to work properly. What I want to do is using the api Matrix class to create the inverse of the one I retrieved from the xform command.

#get the inverse matrix using the maya api
def inverseMatrix(m):
newM = []
for i in range(0,4):
for y in range(0,4):

ma = om.MMatrix(newM).inverse()

for i in range(0,4):
for y in range(0,4):

return newM

I'm converting the matrix from float[16] to float[4][4] but the function seems to want 'float const [4][4]' and I have no idea how to create it. I know there is the MScriptUtility class for making pointers and references but it doesnt seem to help there.
Does anybody know how to do this? I guess I could use some math library for python but I wanted to get more familiar using the API .. :/

Thanks for any hints!

02 February 2008, 10:37 PM
Try this to get and set an MMatrix from a list:

def getMMatrix(inputList):
matrix = mOpenMaya.MMatrix()
mOpenMaya.MScriptUtil.createMatrixFromList(inputList, matrix)
return matrix

def setMMatrix(inputMatrix):
returnList = []
for row in range(0,4):
for col in range(0,4):
matrixValue = 0.0
matrixValue = mOpenMaya.MScriptUtil.getDoubleArrayItem(inputMatrix[row] , col)
returnList.append( matrixValue )
return returnList

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02 February 2008, 10:37 PM
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