I’m working on importing our game animation format to Maya
The data is stored as RST transforms per joint / per frame. Looping over each frame one at a time will be slow so I’m seeking a way to set many keyframes in one go. So far I’ve found OpenMaya.MfnAnimCurve.setKeys()
Experimenting with it , setting rotation keys, I have found that I am unsure precisely which units rotation plugs expect. The docs mention nothing under MfnAnimCurve.setKeys()
I tested with a range of ints and setting a value of 1 on rotate x yields value of about 52.2 in the channel box , which I guessed to be 1 radian. Converting each int from degrees to radians seems to comfirm this
But I have not found confirmation of this in the docs. I wonder if the value type expected for rotation keys is reliant on user settings, or some other setting, similar to the time value? Can I always expect .setkeys() to utilize radians for rotation channel values?
Another question is : my source data is quaternions , i wonder if there is an attr plug for setting multiple rotation keys using quats, or perhaps using a matrix to set all transform channels efficiently?
As for setting quaternion values directly: not that I know of. The way I understand it, animation curves each control a single floating point value. So there would be no way to set things that have multiple values without multiple anim curves.
In one of my scripts i do something like this for rotations :
trs = MTransformationMatrix(local_matrix) # i grab the matrix i need
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if set_rotate_order:
trs = trs.reorderRotation(rotate_order+1) # set the rotation order
euler = trs.rotation(asQuaternion=False) # grab rotation values from matrix
euler = om2.MEulerRotation(euler.x, euler.y, euler.z, rotate_order)
euler.reorder(rotate_order) # re-order rotations
# Write values per frames
keys["rotateX"].append((frame, euler.x))
keys["rotateY"].append((frame, euler.y))
keys["rotateZ"].append((frame, euler.z))
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# Then after passing all my keys i apply them to anim curves.
# Use addKeys to set all keys in one go for efficiency
times = [om2.MTime(frame, om2.MTime.uiUnit()) for frame, _ in frame_values]|
values = [value for _, value in frame_values]|
animFn.addKeys(times, values)|
At work, we’ve got a python plugin to make a mel command that lets us set multiple keys across multiple attrs in one go.