Hi Justin, I'm not 100% clear on the needs (i.e., why only one axis is desired, which prevents you from using a much cleaner quaternion-based solution), but if you're only wanting to extract rotation about a single axis from a matrix that has rotation about all three axes, then you need to select some decomposition order if you want it as Euler angles (e.g., XYZ, ZXY, etc.)—probably just whatever is being used by the transform you are piping it to. In Maya, there is an MTransformationMatrix constructor that accepts an MMatrix. Thereafter, you can call reorderRotation on the transformation matrix to set your desired decomposition order and simply get its eulerRotation.
Sorry if I missed what you need to do a bit, but hopefully there's something helpful here On Tue, Jul 17, 2012 at 5:15 PM, Justin Israel <[email protected]>wrote: > Hey all. > > My current project right now has an aspect which is not my forté. > Hopefully you guys with strong matrix manipulation skills can advise the > "pipeline" guy... > I'm dev'ing a library that reads and delivers Kinect sensor data to Maya. > The joint orientation data is delivered as 3x3 rotation matrices. As of now > to get the concept working, I am converting them to Euler on the library > side (via cgkit<http://cgkit.sourceforge.net/doc2/mat3.html#mat3.toEulerXYZ>), > and then piping them into maya over my socket. Within Maya, for this > specific example, I am just interested in applying the rotZ to my > component. And I am doing that very basically right now with a rotate > command to see live results. > > What I would like to do is just send my 3x3 rotation matrix in its raw > form and apply the rotZ via the API to the rotation of the transform. I > will always be applying transformations by discrete axis (usually I only > care about rz, and for translation I only care about tx/ty). > > Can someone give me a quick workflow suggestion of 3x3 rotation matrix -> > add rz to QTransformationMatrix ? > I know I will need to pad it out to 4x4, and create an MMatrix, but once I > have that I am pretty weak on the concept of the matrix operations. > > -- > view archives: http://groups.google.com/group/python_inside_maya > change your subscription settings: > http://groups.google.com/group/python_inside_maya/subscribe > -- view archives: http://groups.google.com/group/python_inside_maya change your subscription settings: http://groups.google.com/group/python_inside_maya/subscribe
