get world position from matrix

[email...@gmail.com]

hello.
Suppose I have local position and rotate and scale of child node, I also have world position and rotate and scale of parent node.

now How can I have local matrix of child and parent world matrix? and From these two matrices, I get the child world matrix and world position and rotate of child node.
please help me. thanks!

[Roland Reyer]

What’s your goal?

Do you want to query the world position/rotation of the child? —> xform -q -ws ...

[Roy Nieterau]

Not sure I understand. but you could build up the matrix with MTransformationMatrix in the API if you really need to:

import maya.api.OpenMaya as om

translate = [0, 0, 0]
rotate = [0, 0, 0]
scale = [1, 1, 1]

trans = om.MTransformationMatrix()
trans.setTranslation(om.MVector(translate), om.MSpace.kObject)
trans.setRotation(om.MEulerRotation(rotate, om.MTransformationMatrix.kXYZ))
trans.setScale(scale, om.MSpace.kObject)
matrix = trans.asMatrix()

But like Roland states if you're just interested in matrices of nodes in Maya you can just as easily query them.

from maya import cmds

selection = cmds.ls(sl=1)
node = selection[0]

world_space = cmds.xform(node, query=True, matrix=True, worldSpace=True)
object_space = cmds.xform(node, query=True, matrix=True, objectSpace=True)
print world_space
print object_space