IK Handle Tag & Orient Constraint Tag Glitch

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Laikix

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IK Handle Tag & Orient Constraint Tag Glitch

While working on this project I applied an IK Handle Tag and an Orient Constraint Tag on a joint in order to use a spline for positioning. What I have found when using it is that it once in a while the positioning drastically changes for the joint. I haven't found any easy ways to work around it other than to change the orientation and positioning of the spline to reposition the joint until it stops having this effect.

A video displaying the issue can be found here: http://youtu.be/kuObvA8hflI

The file was too big for the forum's upload, so the link for the download is here: https://www.dropbox.com/s/7emdlm149zmutp8/Scene_2.jas.zip

Things I have found:
  • When orientating the Camera using from a perspective view, the joint flickers between it's proper positioning and the improper one.
  • When hovering the mouse pointer over any modifier (Rotation, Size, and Positioning), the flickering occurs.
  • Changing any modifier does not solve the problem.
  • The change only occurs for one or two frames.
I hope someone knows why this is happening or how to fix it, and if he or she could explain to me how to solve it.
 
Having unstable IK is quite common for some rigs.

  • Have you tried adding a pole to the IK handle?
  • Have you put a little angle in each joint in your rig (a slight bias in the intended bending direction?)
  • Are you using the 2D solver or the 3D solver. (The 3D solver is flakier than the 2D solver.) (edit)
  • Does removing the spline and directly working with the underlying joint solve the problem?
 
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I have not tried a pole, but I am using the 3D solver (Mostly because I could not get the 2D solver to work) and have used a slight bend of 40-ish. The joints work fine on their own, so I will have to try with a pole and figure out not using the 2D solver.
 
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