Increase Speed

Question

I'm trying to script a cube where upon going through a bigger cube, it increases speed. Here's my code:

 using UnityEngine;
 using System.Collections;
 
 public class IncreaseSpeed : MonoBehaviour {
     public float speed;
     
     void OnTriggerEnter(Collider other) {
         
         if(other.gameObject.CompareTag("Trigger01")){
             rigidbody.AddForce(0,0,speed);
             Debug.Log("We've finally touched!");
     }
 }
         }

The console reads the Debug Log "We've finally touched!" so it's detecting collision and the trigger does work.

So why isn't a force being added to the cube? I was thinking maybe it's because I have this in an OnTriggerEnter method and that it's only adding a force to the rigidbody for one frame?

I'd appreciate any assistance. Thank you for your time.

Answer 1

Best Answer

Answer by AlucardJay · Oct 19, 2012 at 11:18 PM

As force is applied over time but OnTriggerEnter only happens once per event, you need to use Impulse Force Mode in your Add Force :

AddForce : http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody.AddForce.html

ForceMode.Impulse : http://docs.unity3d.com/Documentation/ScriptReference/ForceMode.Impulse.html

all ForceModes : http://docs.unity3d.com/Documentation/ScriptReference/ForceMode.html

Replace the Addforce line in your script to :

 rigidbody.AddForce( 0, 0, speed, ForceMode.Impulse );

or you may want to use :

 rigidbody.AddForce( transform.forward * speed, ForceMode.Impulse );

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