About Hinge Joint Angle, Limit, and Motor.

Unity Engine
1

I’m using multiple Hinge Joint to make a crane, and I find that the hingejoint.angle is not the same angle using in hingejoint.limits. The angle will change if I rotate parent hingejoint using motor.

And in motor, I find that setting targetvelocity to zero will not stop hinge joint rotating by gravity. I have to set a small value to it, like 3, so the hingejoint can fully stop.

I’m not sure whether it is a bug or I’m mistakenly using hingejoint. Anyone have some idea? Thanks.

1 Like
2

Anyone?
I also do some test, that the hingejoint.angle is not equal to rotation angles even when I don’t rotate the joint.
So how is the hingejoint.angle calculate? And how can I get a real angle of current hingejoint? Great thanks!

3

I’m with the same problem. It’s very strange that hingejoint.angle changes when the body rotates.

4

Yep. Can someone from Unity please look into this? It seems like HingeJoint.angle is almost completely useless as is.

5

i too, help pls

6

i solved the problem using 360 - transform.localEulerAngles.z

1 Like
7

This got me on the right track!
I used something like:

float xx = transform.localEulerAngles.z<180?transform.localEulerAngles.z: transform.localEulerAngles.z-360;
…
value = (xx) / (joint.limits.max - joint.limits.min)*2;