Hey There!
I m just fixing one of the limitations of our animation exporter
(~Maya). At the moment animation is recorded fine and keyframe data is
happily sorted into dictionaries and put back. The problem is
currently the top node (the character control under which all others
are kept) was being stored as values from a decomposeMatrix node.
This was fine till someone noticed the XYZ rotation order bug with
this plugin. I would prefer to record the position of this top node as
WS Matrix for each frame (heavy I know).
>From this we are able to reapply animation easily to other rigs
regardless where it is in DAG, as the WS matrix is in WS. From this I
can get the keyframe values on the fly in the scenes themselves.
Now I ve got as far as being able to find the difference in
Translation between 2 matrices using this code but Rotation is just
screwing my brain.
Is my method even possible or will I have to use XForm to set the node
in space then key these values? This will almost certainly take a
looong time.
Here s the code, get your laughing masks ready !
import math
import maya.cmds as mc
import maya.OpenMaya as om
# returns matrix in ws of an object, to be used at every frame to
store data
def get_matrix_transforms(object):
matrix = mc.getAttr(object+".worldMatrix")
return matrix
def set_trans_to_matrix(source,dest):
# set matrix function from source matrix.
xform_source = get_matrix_transforms(source)
xform_dest = get_matrix_transforms(dest)
source_matrix = om.MMatrix()
dest_matrix = om.MMatrix()
om.MScriptUtil.createMatrixFromList(xform_source, source_matrix)
om.MScriptUtil.createMatrixFromList(xform_dest, dest_matrix)
#ws_source_quart = ws_source_trans.rotation()
# not sure which one to subtract
difference_world = source_matrix-dest_matrix
difference_world_trans =
om.MTransformationMatrix(difference_world)
# Get scale translate and quart of these results
diff_trans =
difference_world_trans.getTranslation(om.MSpace.kWorld)
diff_rot_quart = difference_world_trans.rotation()
diff_rot = diff_rot_quart.asEulerRotation()
angles = [(math.degrees(angle)) for angle in (diff_rot.x,
diff_rot.y, diff_rot.z)]
print "the difference in translation is"
print diff_trans.x
print diff_trans.y
print diff_trans.z
print "the euler angle is..."
print angles
set_trans_to_matrix('dest','source1')
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