A question came up in our group on how to arc track Ballie’s knees, so thought I’d show how to do it step by step as it’s quite useful.
3. Create a polygon sphere and snap it to the knee joint by holding down v when you move it. Duplicate the sphere and move the 2nd sphere to the other leg.
Grab one sphere then Shift+select the knee joint it’s placed on and press P. Do the same for the other leg.
5. It might be worthwhile placing both spheres in a new layer, this way you can hide + show them easily. I also did this again for the ankles, but later realised the heels are a better place to track.
**I should at the time of writing this post we were using a different arc track tool. Thanks to Ben for this heads up in the comments:
“One additional step I needed to take was set a key on the first frame on each sphere, then I could see the arc using ‘Create editable motion trail'”.