I am having trouble with quaternion rotate towards

Question

I have an object that rotates at different times and different rotations and I can't figure out what to add for time to keep it from shuttering using rotate towards. How do I get/measure the time between each new rotation?

Answer 1

Answer by Klarzahs · Oct 24, 2020 at 08:09 AM

Here is a code sample if you still need it:

 //calculate target vector
 Vector3 vec = (targetGO.transform.position - transform.position).normalized;
 //interpolate towards goal
 transform.forward = Vector3.Lerp(transform.forward, vec, Time.deltaTime * speed);

where speed defines your rotation speed.
Lerp(a, b, t) is a linear interpolation from a to b with parameter t. If t = 0, then it returns a, if t = 1 it returns b. If it is between 0<t<1, then it is linearly in between the two :)
You should normalize the targetvector, otherwise it will rotate faster is the goal point is far away.
Standard untested disclaimer

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Answer 2

Answer by roszek2 · Oct 25, 2020 at 03:55 PM

Where you have speed I don't have a constant speed with different forces being applied to the object. That's what I need to figure out I think.

There is a main object that moves and rotates based on forces applied to it's RigidBody and a clone of that object that needs to equal that movement. The object clone receives a position and rotation from the main object only. How would I get the maxDegreesDelta that Quaternion.RotateTowards and Vector3.MoveTowards calls for, which would vary in my case?

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Klarzahs · Oct 26, 2020 at 08:12 AM 0

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Do you your second object to instantly copy the position/rotation of your main object? You could simply use

 void Update(){
   secondObject.transform.position = firstObject.transform.position;
   secondObject.transform.rotation = firstObject.transform.rotation;
 }

If you want to rotate it slowly, you can rate limit it by checking the angle between vectors and apply a $$anonymous$$(angle, maxDegreesDelta) function call. Position is similar, just check the distance and have a maximum

roszek2 Klarzahs · Oct 26, 2020 at 05:40 PM 0

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Yeah, that makes sense. Thanks.

I am having trouble with quaternion rotate towards

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