So I have a skeleton and I used a ‘CHILD OF’ bone constraint to a bone to make it retain its translation with respect to another bone in the same armature. I needed to export this animation so I wanted to convert the constrained bone positions into keyframes. I wrote a looping script for this:
import bpy
for bpy.data.scenes[“v_pist_usp.qc”].frame_current in range(bpy.data.scenes[“v_pist_usp.qc”].frame_start,bpy.data.scenes[“v_pist_usp.qc”].frame_end):
bpy.ops.constraint.disable_keep_transform()
bpy.ops.anim.keyframe_insert_menu(type=‘LocRotScale’)
bpy.ops.constraint.delete()
bpy.ops.pose.contraint_add(type='CHILD_OF')
bpy.data.objects["v_pist_usp.qc_skeleton"].pose.bones["j_mag1"].constraints["Child Of"].target=v_pist_usp.qc_skeleton
bpy.data.objects["v_pist_usp.qc_skeleton"].pose.bones["j_mag1"].constraints["Child Of"].subtarget=j_slide
bpy.ops.constraint.childof_set_inverse()
bpy.data.scenes["v_pist_usp.qc"].frame_current+=1
print(“Successful”)
But It shows error on first line for disabling constraint influence(even though I do have the constraint setup to begin with). Error message:
“RuntimeError: Operator bpy.ops.constraint.disable_keep_transform.poll() failed, context is incorrect”
Things I have tried: Removed the line and decided to execute it without a loop and manually disable influence on reach execution; blender crashed each time I attempted executing.
Expected behaviour: The script sets up the constraint, disables/applies influence and keyframes it, deletes the constraint, sets up the constraint again, moves to next keyframe.
N.B: The rest of the armature has keyframed motion. I wanted a single unkeyframed bone(driven by constraint) to follow the keyframed one and get keyframed throughout its motion. Thus becoming suitable for exporting.