I am an issue with Lamp Stem’s constraint. When I use Look to control the lamp, the Lamp Stem moves X and Z which I’ve constrained them already, and Y is unconstrained. I couldn’t figure out the problem.
Do you use IK?
And is the length of the IK chain -1?
Yes, I use inverse kinematics and chain is 4.
Need to be three I think!
I have an experiment with inverse kinematics. Why is the bone constraint not working when I apply IK? the bones are moving through themself.
- Did you use length = 3 for 4 bones?
- Did you add bone restrictions for the bone rotations?
if I use 3 chain then the bottom bone won’t move at all. Yes, I use the bone constraint to restrict bone rotation.
That is correct. You need to connect the bone to a parent something (like an empty, or lamp base_.
Adding restrictsing is hard to do, because of the 360 rotation minus/positive trurns and local world coordinates. A lot of things can go wrong. Check everything.
Start small using two bones. expanding the chains.
But with BONE CONSTRAINT, the bones are not suppose to move through themself. And the bottom bone should move rotating Y axis, not X and Z.
with 3 chains, bottom bone not moving or rotating Y axis.
It seems the IK is override the BONE CONTRAINT, when I check the individual bone constraint movement, it works. But when I use control bone (the cone) everything is not working. How can I fix this problem?
Unsure … because you’ve 2.9 I’m using 3.3 things are changing.
They have their own (limited) set of “constraints” through the Inverse Kinematics panel, and that’s all – making the solvers use/understand all Blender’s constraints is difficult work.
I am sure this was covered in the lectures. IK has its own constraints, perhaps it is worth rewatching the start of using IK looking out for the part on constraints.
Yesssss! Thank you. It works, everything is working now.
In bone properties, I locked the Lock IK in the inverse kinematics drop down.
Should I use both bone constraint and Ik constraint? Or Ik constraint is good enough for controlling the lamp.