2
$\begingroup$

Underside view

The root of my IK arms are twisting, this is because I need to either roll the bones or apply a pole angle in order to make the elbow fold in the correct direction, unparenting and removing the armature and then reparenting is not helping, what can I do to fix this?

$\endgroup$
8
  • 1
    $\begingroup$ So, as you say, have you tried to change the Pole Angle? If it doesn't work, please share your file $\endgroup$
    – moonboots
    May 14, 2023 at 9:57
  • $\begingroup$ @moonboots Adding the pole angle makes the elbow point towards the correct direction but twists the mesh workupload.com/file/uKGSjv6tp4c $\endgroup$ May 14, 2023 at 9:59
  • $\begingroup$ you need to set a Pole Angle of about 70° for your forearm.R and the shoulder won't deform anymore. Also it would be better to align the bones with the axis, select them in Edit mode and Shift N $\endgroup$
    – moonboots
    May 14, 2023 at 10:04
  • $\begingroup$ @moonboots Yeah but then the elbow points in the wrong direction, that's why the bones are rolled like that in the first place $\endgroup$ May 14, 2023 at 10:07
  • $\begingroup$ If I choose a 70° pole angle I don't see the elbow pointing bad, it points exactly like it does if I deactivate the Armature modifier $\endgroup$
    – moonboots
    May 14, 2023 at 10:11

1 Answer 1

2
$\begingroup$

In Edit mode, flatten the arm and forearm on Z (SZ0), ShiftN to align with the axis, CtrlR to make them have the same orientation, bend a bit the elbow background, align the Pole Target with the elbow on Z, in the IK modifier change the Pole Angle of the IK and it works fine (also put the Armature modifier above the Subdivision Surface):

Front view:

enter image description here

Top view:

enter image description here

$\endgroup$
2
  • $\begingroup$ Won't the misalignment of the bones now cause problems with the way the mesh deforms during movement? $\endgroup$ May 14, 2023 at 10:36
  • $\begingroup$ If your talking about the elbow that needs to be bent a bit, as seen in the second image (top view), it's necessary to indicate in what direction the arm is supposed to bend $\endgroup$
    – moonboots
    May 14, 2023 at 10:43

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .