enter image description here I added a rig with both forward and inverse kinematics but whenever I move the right hand then for some reason the left arm moves in a weird way, same withe the feet.

I have already checked and every bone is labelled correctly and no bone constraint has the wrong bones set.

Thank you.

  • $\begingroup$ please share your blend file. It appears you have a weight painting issue, but you might also have inverse kinematics parenting or modifier set up wrong. $\endgroup$ Commented May 7, 2021 at 14:54
  • $\begingroup$ I've now added the blend file in the original question $\endgroup$ Commented May 7, 2021 at 14:59

1 Answer 1


You have weight painting problems. Here's how I found the first one:

Go back to object mode and select the model.

Go into edit mode. Select solid view and xray:

x ray and solid mode selected

deselect all with ALT-a

In the Properties editor, in the Object Data Tab, go to the Vertex Groups area and select one of the relevant vertex groups.

Press the select button. The vertices that are in that group become selected. Here, for example is the model with bicep.R selected:

bicep.R selected

Keep doing this and you will eventually come to forearm.R:

forearm.R in the vertex group list

Select it and you get:

forearm.R selected

Since the left forearm vertices are selected, they will move when the forearm.R deformation bone moves.

In this case, a simple fix is to manually deselect all of the vertices that should stay in the group. I used circle select with middle mouse but there are a lot of ways.

right arm vertices deselected

Next go to the vertex group and click "remove". This will remove the remaining vertices from the group.

as you can see that partially solves your problem:

IK on the right arm now works

What I did isn't the usual way of fixing this sort of problem. Normally you would use weight paint mode. It looks like you have a lot of related issues so you might want to find a tutorial on weight painting.

  • $\begingroup$ YES thank you, you're a life saver. This is a project for my college, the next thing I was going to learn was weight painting so that pans out. $\endgroup$ Commented May 7, 2021 at 15:24

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