Blender Asked by Spankle on December 19, 2021
As the title says, when I rotate the bone on the Z axis, there is a certain point where the X rotation in my driver for said bone goes from a 100 degrees to -79 degrees.
This is a very strange issue that can be easily recreated in both blender 2.80 and 2.79.
Any help would be greatly appreciated!
Here is a link to the blend file – https://drive.google.com/file/d/1k0ILPeLmbjhEMrdR95M9O262BYOqDPxk/view?usp=sharing
Your confusion derives by two different axis orientations: you did rotate the whole armature (an object which contains only one bone, but they could be more), while the expected result should be achieved rotating only one bone (in pose mode, not in object mode).
In my picture I turned on axis rapresentations, the big ones are referred to the object (the whole armature, that should not be rotated); the little ones are thoose of the single bone. As the two axis system are not aligned, you can see that a rotation on the Z axis of the whole object while it's tilted even on X and Y axis causes a negative rotation on the X axis of the bone.
I also find this system a little confusing, but this is how it works, start rotating bones in pose mode and keep bones axis turned on in viewport display properties to get used to it; drivers are a great resource once you master them!
Answered by josh sanfelici on December 19, 2021
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