I've got a chain of inverse kinematic a bones, and I want the one that I grab to be unable to rotate while it is moving. How do I do this?
My setup is a rigged car assembly arm: http://sendvid.com/8z51fsgm
When I move it, the end of the arm points towards the cursor rather than simply translating up/down/left/right like a real arm. Example: https://www.youtube.com/watch?v=xglALqtKGAc
Notice how the arm's grabber tool never rotates absolute to its surroundings. The rest of the arm knows how to rotate in such a way that the tool never has to. How do I do this in Blender?