How to rotate an object by a certain number of degrees, over a certain period of time, on a button press?

Questions & Answers
1

I have a cube, and I want to rotate it on a GetButtonDown event, but I only want it to rotate 90 degrees, and I don’t want it to be instantaneous (I’d like a short animation so it appears to rotate). I wrote this code, and it works! But it rotates by 90 degrees all at once on the GetButtonDown. Basically I’d like the GetButtonDown to start a short animation in which the cube rotates 90 degrees over - say 2 seconds.

Here’s the code I wrote:

using UnityEngine;
using System.Collections;

public class Control : MonoBehaviour {

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

		if(Input.GetButtonDown("RotateRight")) {
			transform.Rotate(0, 90, 0);
		}

		if(Input.GetButtonDown("RotateLeft")) {
			transform.Rotate(0, -90, 0);
		}
	}
}

I’ve looked into quaternions and slerps and I feel like the answer to my problem has something to do with those, but I don’t really understand how they work or how to utilize them yet.

2

transform.Rotate(Vector3.up, int * Time.deltaTime);
}

Int replaced by desired speed

3

An example of Lerp I just threw together, let me know if it helps (or even works), if it doesn’t I hope you get the general idea from it.

This makes use of the GetKey function to get input, much cleaner. Alpha1 is number 1 on your keyboard.

public class EXAMPLE : MonoBehaviour
{
    bool cooldownActivated;
    float spinningTime;
    float timeStarted;

    Quaternion rotateB;
    Quaternion rotateA;

    int count = 1;

    void RunCooldownTimer()
    {
        float timeSinceStarted = Time.time - timeStarted;
        float percentageComplete = timeSinceStarted / spinningTime;

        transform.rotation = Quaternion.Lerp(rotateA, rotateB, percentageComplete);

        if (percentageComplete >= 1)
        {
            cooldownActivated = false;
        }
    }

    public void Activate()
    {
        spinningTime = 1;
        cooldownActivated = true;
        timeStarted = Time.time;

        Transform thisTransform = gameObject.transform;

        rotateA.eulerAngles = this.transform.rotation.eulerAngles;
        rotateB.eulerAngles = rotateA * new Vector3(0, 0, 90 * count);

        count++;

        if (count == 5)
        {
            count = 1;
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey(KeyCode.Alpha1) && cooldownActivated == false)
        {
            Activate();
            cooldownActivated = true;
        }

        if (cooldownActivated)
        {
            RunCooldownTimer();
        }
    }
}

This took me a while, damn rotations! Hope you’re happy with it. This should be 100% what you’re looking for now. If you find it satisfactory don’t forget to mark as answered.

Matt.