Smooth tire rotation

Question

I'm trying to make a tire rotate on the Y axis for my car controller. I have a list of tire "points" that I want to smoothly rotate 45 degrees to the left and to the right based on player input.

I have been able to achieve a basic version of this using:

 void Update()
     {
         foreach (Transform tire_transform in suspension_list) {
             float rotate = Input.GetAxisRaw("Horizontal") * 45f;
             tire_transform.transform.localRotation = Quaternion.Euler(0f, rotate, 0f);
         }
     }

However, it has not been able to achieve a smooth transition that I want, and snaps from left to right immediately. How do I create some sort of angle buffer / smooth the transition whilst also being able to move the local rotation depending on any Y axis value the car may be on?

Answer 1

Best Answer

Answer by tormentoarmagedoom · Oct 08, 2022 at 06:47 AM

Hello.

You are looking about LERP variables/values. LERP is a fuction that smoothly chage some variable value.

There are several tutorials, and posts about this topic. Go learn bout it!

Bye!

https://docs.unity3d.com/ScriptReference/Quaternion.Lerp.html

https://answers.unity.com/questions/643141/how-can-i-lerp-an-objects-rotation.html

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Answer 2

Answer by shworm · Oct 08, 2022 at 02:30 PM

Thanks so much for the help! I ended up fixing this using:

 foreach (Transform tire_transform in suspension_list) {
     // returns -45 to 45
     float rotate = Input.GetAxisRaw("Horizontal") * maxTire_Angle;
     // get localRotation and desired localRotation
     Quaternion rot_initial = tire_transform.transform.localRotation;
     Vector3 rot_target_float = new Vector3(0f, tire_transform.transform.localRotation.y + rotate, 0f);
     //convert Vector3 to Quaternion
     Quaternion rot_target = Quaternion.Euler(rot_target_float.x, rot_target_float.y, rot_target_float.z);
     //lerp smoothly
     tire_transform.transform.localRotation = Quaternion.Lerp(tire_transform.transform.localRotation, rot_target, Time.deltaTime * speed);
 }

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Smooth tire rotation

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