Is there a way in MatLab to extract scale, rotate and translate from a 4x4 transform matrix taken from Maya?

Ok, so I'm specifically wanting to take the rotate X, Y and Z from the transform matrix but I would presume (as the matrix hold all the info) that someone has come up with a way to read the matrix and return the values held within.

The translation order in Maya is scale, rotate, translate. Default rotation order is XYZ

I'm not sure if this link helps at all if anyone can make sense of it?

http://download.autodesk.com/us/maya/2011help/API/class_m_transformation_matrix.html

Answer 1

[Matt J]

If you have a 4x4 matrix that you want to decompose, you could use this

http://www.mathworks.com/matlabcentral/fileexchange/26186-absolute-orientation-horns-method

E=absor(eye(4), your4x4);

[Lennart]

A =

    0.1953         0         0 -140.8863
         0    0.1952    0.0612 -127.8713
         0   -0.0060    1.9991   -0.3536
         0         0         0    1.0000

>> absor(eye(4),A)

Error using absor (line 228)

Points must be either 2D or 3D

[Matt J]

Hmmm. Don't know what I was thinking, there. But I believe this should fix it

    target=bsxfun(@plus,A(1:3,1:3),A(1:3,end));
    source=eye(3);

    E=absor(source, target,'doScale',1);

Also, I was assuming a uniform scaling in X,Y,Z.