- Bearbeitet
Transform constraints and weapons
Hello, I'm rather new to Spine so I might just be doing something wrong, however I'm having a potential issue with transform constraints.
I'm rigging a character holding a sword and I need the sword to be separate, so I'm setting a constraint to hook it to the chara's hand. I had previously set two control bones on the weapon to ''rotate it'' with a slight 3D effect, one constrained to the other and translate set to -100.
When I set the constraint to hook the weapon to the hand, the other constraint breaks. I can see it in the tree and it seems fine but it just doesn't work and the position of the target bone is reset.
I worked around this problem by creating the main constraint first (sword to hand) and then setting up the other two for the rotation effect. It works fine, but this way I won't be able to create other constraints to the main sword bone in the future (say, I'll need it to be put away in a sheath or moved to the other hand)
It this a bug, am I doing something wrong or what?
Anybody know a workaround?
Thank you! 
This is probably caused by the constraint order being incorrect. Note that your constraints are calculated from top to bottom.
For example, let's say I use an IK constraint on an arm. On the same arm, I also transform constraint a bone to the hand (could be a weapon). In this case, I must calculate the IK constraint before the transform constraint because I must calculate the position of the hand before constraining a weapon it.
You can re-order the constraints by dragging them in setup mode.
THANK YOU! Exactly what I needed to know 
I'm new to the software and keep forgetting the tree order matters
You're welcome
It does indeed matter, but in some cases, a "wrong" constraint order can be useful. So don't be afraid to experiment.
I'm working on an example project to showcase this at the moment.
14 Tage später
Hello, I'll resume the thread since I have some more issues with transform constraint, on a different rig though.
I need to link some bones to the legs of a creature. I set up transform constraints for both with the same characteristics. One works perfectly, the other seems to partially follow different bones in some animations. I even tried deleting it and redoing the constraint completely, checked that there are no other transformations on the linked bone etc. No difference. I also tried setting up a different constraint targetting the same leg bone and it goes crazy like the first. Does the same on the first parent. Tried changing the order in the tree, too.
I have no clue what to check next 
For the project's sake I could easily do this manually and ignore that particular constraint but it beats me how it doesn't work since it's the exact same as another. I might need the knowledge on another occasion
Replying for future reference.
After some more testing and trying and redoing I finally noticed I had some IK constraints on the target bone that were below the transform constraint in the tree. Totally didn't notice before, I moved them up and it works now.
I don't get how the transform constraint followed other bones instead of just not working in this case, but still, it's fixed now
Glad you resolved it!