koobas.hobune.stream
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Weird rotation when using Slerp!!?
I have a gun turret, and I want it to smoothly rotate on global Y axis to face an near by enemy. I'm using Quaternion.Slerp() for this, here is the code:
target = col.transform;
direct = target.position - transform.position;
direct.y = 0;
rot = Quaternion.LookRotation(direct);
rot = Quaternion.AngleAxis(rot.y, Vector3.up);
transform.rotation = Quaternion.Slerp(transform.rotation, rot, Time.deltaTime * 2.0f);
The problem is even after giving planar coords. Slerp is rotating in all the directions. I'm using a simple low poly model to demonstrate:
I want the turret to rotate, and face the blue cube so that I can play fire animations and particles. But the turret object is rotating weirdly in all 3 directions like this:
As you can see the turret rotates to face upwards and not the way I wanted. Locally Z-axis is the up and maybe that is the problem? I still don't get how quaternions work. I came across many similar problems but nothing worked for me. I'm smashing my head against the wall for 2 hours. Please help!!!
The problem was that the imported model for 3ds Max has messed up axis. So locally and globally model has different axes for a same direction like Z axis was up locally. This was messing up the rotations. I parented the turret to a empty and applied the script to it. Works flawlessly now.
Why are you using Quaternion.AngleAxis ?
This should work:
target = col.transform;
var direct = target.position - transform.position;
direct.y = 0;
var rot = Quaternion.LookRotation(direct);
//rot = Quaternion.AngleAxis(rot.y, Vector3.up);
transform.rotation = Quaternion.Slerp(transform.rotation, rot, Time.deltaTime * 2.0f);
if the axis is not right, you can use a dummy parent
Hah, I was trying something stupid which got copy pasted. Yes, dummy parent thing worked!
you are correct, that is the problem. if you cannot rotate it any other way, wrap your turret in another gameobject which is setup correctly. LookRotation uses z as forward.
@hexagonius Thanks for replying. Do you think that make the turret child of a empty object and applying the script to that empty would solve this problem?
