From BlenderWiki
- Rot
- Toggle option to make the IK chain follow the rotation of the target object.
- Use Tip
- Toggle option to use the tip of the bone instead of the base to solve the IK to. This option toggles between the old Blender behaviour (don't use tip) and new behavior (use tip).
An IK constraint on the yellow bone with indicated target. Left: without Use Tip. Right: with Use Tip.
- ChainLen
- The number of bones above this bone that you want to be affected for IK. The default is 0, which means all bones above this bone will be used for IK.
- PosW
- Weight of position control for this target.
- RotW
- Weight of orientation control for this target.
- Tolerance
- foo
- Iterations
- Maximum number of solving iterations.
