0

i have programmed a retarget operator in python, but it needs dozens of depsgraph updates while calculating a single pose, so its super slow. I have a code snippet here:

for tpbone in arm.pose.bones:
    matrix = retarget(...) #transfer the pose matrix
    tpbone.matrix = matrix
    depsgraph.update() # needed to recalculate matrix for all pose bones

def retarget(src_rig, src_pose_bone,
    tgt_rig, tgt_pose_bone):


scpbm = src_pose_bone.matrix
scdbm = src_pose_bone.bone.matrix_local
tcdbm = tgt_pose_bone.bone.matrix_local

sm_world = src_rig.matrix_world
sm_apply_rotscale = sm_world.inverted()
sm_apply_rotscale.translation=((0,0,0))

tm_world = tgt_rig.matrix_world
tm_apply_rotscale = tm_world.inverted()
tm_apply_rotscale.translation=((0,0,0))

SD = sm_world @ scdbm @ sm_apply_rotscale
TD = tm_world @ tcdbm @ tm_apply_rotscale
SP = sm_world @ scpbm @ sm_apply_rotscale

Q = SD.to_quaternion().rotation_difference(TD.to_quaternion())
ROT = Q.to_matrix().to_4x4()
matrix = SP @ ROT

return matrix

When i do not call depsgraph.update then the matrix data returned by the retarget() function is wrong. However, can i avoid the depsgraph updates to make this run faster?

Gaia Clary
  • 3,802
  • 2
  • 24
  • 39
  • Investigate usage of numpy and pose.bones.foreach_get / set Bit hard to do too much from info given. – batFINGER Sep 29 '21 at 11:57
  • @batFINGER i have added the retarget function that i use. Does this give a clue for why omitting the depsgraph.update() returns bad matrix data ? I am not sure how i could use numpy here or the foreach... functions. – Gaia Clary Sep 29 '21 at 15:04
  • Not sure. Bit different to what i imagined. Generally use Object.convert_space for bone matrix calcd across objects. https://blender.stackexchange.com/a/109852/15543 – batFINGER Sep 29 '21 at 15:14
  • well, my way to get the matrix works reliably when i call depsgraph.update() after calculating the matrix. So the question is: does your method avoid calling the depsgraph.update() function ? I suspect that it might get called from the convert_space() function. If that is the case, then then it would not help to speed up the retarget. – Gaia Clary Sep 29 '21 at 15:46
  • Doubt very much that convert space, which simply creates a matrix calls an update. (btw wasn't putting forward comment as an answer to question) ...although imagine it would be quicker. A hierarchical approach, leaf nodes up could reduce number of updates. – batFINGER Sep 29 '21 at 15:56

0 Answers0