I'm trying to figure out a way to export animation keyframes for each individual action in a scene. My current method is to find each keyframe for each action, set the pose to that key, and export the current pose bone transforms. It doesn't work though. I can't get the pose bones to change when I change the frame.

I have searched the forums and found solutions, but they don't work for me. I think it's probably because I'm running the script from the command line rather than in an existing instance of Blender.

Here's my code so far:

Code:

for action in bpy.data.actions:         ob.animation_data.action = action         bpy.ops.object.mode_set(mode="POSE")         bpy.ops.pose.select_all(action="SELECT")         bpy.ops.pose.transforms_clear()                 # get all frame numbers in this action         frames = dict()         for fcurve in action.fcurves:             for key in fcurve.keyframe_points:                 frame = key.co.x                 frames[frame] = 1                 for f in sorted(frames):             bpy.context.scene.frame_set(f)                         # (read pose bone data here)

you should use print() for some debug output, to see what values your variables hold, maybe there's a problem

run Blender via cmd to see the print output
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I'm sitting, waiting, wishing, building Blender in superstition...

Mmhmm, I did that. It is able to get all the correct pose bones, actions, and frame numbers. It's just that setting the frame with bpy.context.scene.frame_set has no effect on the pose bones.

that's weird...

you may try

bpy.context.scene.update()

after changing frame
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I'm sitting, waiting, wishing, building Blender in superstition...

I just gave it a try. Didn't work.

Solved. My previous code works. The problem was that matrix_basis, rotation_euler, rotation_quaternion, and rotation_axis_angle in PoseBone are always set to the identity transform. (Why would they do that?!) So, instead, I have to use this to get the transform for each frame:

Code:

def getPoseBoneLocalMatrix(poseBone):     if poseBone.parent is None:         return poseBone.matrix     else:         return poseBone.parent.matrix.inverted() * poseBone.matrix