Gently increase speed

Question

I have made a simple script wich rotates an object on a key press. But I want to gently increase the speed to an X amount and when a user lets go of the key it gently decreases to 0.

I'm not sure on how to that, so any help is much appreciated

The script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Swing : MonoBehaviour
 {
 
 
     void Start()
     {
 
     }
 
     void Update()
     {
         if (Input.GetKey("w")) transform.RotateAround(transform.position, transform.forward, Time.deltaTime * 10f);
         if (Input.GetKey("s")) transform.RotateAround(transform.position, transform.forward, Time.deltaTime * -10f);
 
     }
 
 }

The W key rotates the object a certain way and the S key rotates the object a certain way.

Answer 1

Best Answer

Answer by Hellium · Apr 28, 2020 at 10:05 PM

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class Swing : MonoBehaviour
  {     
      [SerializeField] private float minRotationSpeed = -10;
      [SerializeField] private float maxRotationSpeed = 10;
      [SerializeField, Min(0.001f)] private float rotationAcceleration = 1;
      [SerializeField, Min(0)] private float rotationDeceleration = 1;
      private float rotationSpeed;
  
      void Update()
      {
          if (Input.GetKey("w"))
             rotationSpeed = Mathf.MoveTowards(rotationSpeed, maxRotationSpeed, rotationAcceleration * Time.deltaTime);
         
          if (Input.GetKey("s"))
             rotationSpeed = Mathf.MoveTowards(rotationSpeed, minRotationSpeed, rotationAcceleration * Time.deltaTime);
 
          if (!Input.GetKey("w") && !Input.GetKey("s"))
              rotationSpeed = Mathf.MoveTowards(rotationSpeed, 0, rotationDeceleration * Time.deltaTime);
          
          transform.RotateAround(transform.position, transform.forward, Time.deltaTime * rotationSpeed);
      }
  }

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verschurengiovanni · Apr 29, 2020 at 11:04 AM 0

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Thank you so much. This totally fits my needs!

Answer 2

Answer by Cassos · Apr 28, 2020 at 09:38 PM

This Should work out:

     public float rot_speed = 100;
     public float rot_speedUp = 3;
     Quaternion targetRotation;
     void Start()
     {
         targetRotation = transform.rotation;
     }
 
     void Update()
     {
         float delta = Time.deltaTime;
 
         if (Input.GetKey("w"))
             targetRotation.eulerAngles += new Vector3(0, 0, rot_speed * delta); // Choose your axis, I chose z
         else if (Input.GetKey("s")) // Prevents bugging in any way when both keys would be pressed
             targetRotation.eulerAngles -= new Vector3(0, 0, rot_speed * delta); // Choose your axis, I chose z
 
         transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, delta * rot_speedUp); // Applying the rotation
     }

Greetings,

Max

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Answer 3

Answer by toddisarockstar · Apr 28, 2020 at 09:43 PM

you can use a secondary number that keeps track of the time that the keys where pressed down and then multiply your speed by the new number

     public float downtime;
         
 
         
         void Update()
         {
         bool down = false;
         if (Input.GetKey("w")){ down = true;transform.RotateAround(transform.position, transform.forward, downtime*Time.deltaTime * 10f);}
         if (Input.GetKey("s")){ down = true; transform.RotateAround(transform.position, transform.forward, downtime*Time.deltaTime * -10f);}
         if (down) {if(downtime<1){downtime+=Time.deltaTime;}}else{downtime = 0;} 
 
         
     }

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Gently increase speed

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