Well not quite sure that's what I had in mind. Maybe this is easier ;) *import* Maya.OpenMaya *as* om matrix = om.MMatrix() *# has index operator* *# set matrix elements from sensor data using index operator here* transformation_matrix = om.MTransformationMatrix(matrix) *# has no index operator, but has methods for getting rotation* transformation_matrix.reorderRotation(om.MTransformationMatrix.kZXY) *# or whatever rotation order you need* euler_rotation = transformation_matrix.eulerRotation() z_rotation = euler_rotation.z *# note: this is in radians* *# do whatever you need to do with z_rotation,* *# such as create new MEulerRotation and apply* *# to another transform with MFnTransform.setRotation()*
On Wed, Jul 18, 2012 at 5:37 PM, Justin Israel <[email protected]>wrote: > Our rigs only move in XY and rotate in Z, so the sensor data has > information I don't always want to apply. Ultimately I have to map the raw > sensor data to different axis based on various conditions. I get what you > are saying so far, and I just wanted to make sure this is the most > efficient approach: > 1. Raw data -> MMatrix -> Euler -> Euler.z > 2. get objects MTransformationMatrix -> euler > 3. Set objects euler.z = to this euler.z > 4. MTransMatrix setRotation( updated euler ) > > I was just doubting myself because of the number of objects and > conversions and thought there was some better way that I was missing. > > > On Wed, Jul 18, 2012 at 9:12 AM, Adam Mechtley <[email protected]>wrote: > >> 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 >> > > -- > 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
