Can I instantiate a collision with a plane?

Questions & Answers
1

Ok,

I’ll make this simple:

I am making a simple 2d driving based runner clone. I want to change the speed of my player vehicle when it hits a hazard. The hazard is a plane that is on the same Y position as the vehicle. Im using OnTriggerEnter to make it work, but so far no luck. I’m not sure if it is a problem in the editor or in the code. Ill post the code below but basically when the player hits the hazard it will slow down by a float rate. If anyone could figure this out, I would be most appreciative.

Here is the player script, the part that doesn’t work is near the bottom.

using UnityEngine;
using System.Collections;

public class sPlayer : MonoBehaviour {
	
	public float speed = 30;
	public float maxspeed = 40;
	public float minspeed = 20;
	public float accelrate = .099f;
	public float crashslowrate = -5f;
	
	public AudioClip EngineLoop;
	public AudioClip VanAccelSound;
	

	// Use this for initialization
void Start ()
	{
		
	}
	
	// Update is called once per frame
	void Update () 
	{
		
		
		bool applyDefault = true;
		
		//if (Input.GetKey (KeyCode.D) == true)
		//{
			//AudioSource.PlayClipAtPoint(VanAccelSound, Camera.mainCamera.transform.position);
			
			//transform.Translate(transform.right * maxspeed * Time.deltaTime);
			
			//applyDefault = false;
		//}
		
		if (Input.GetKey (KeyCode.W) == true)
		{
			
			
			transform.Translate (Vector3.forward * -3f);
		}
		
		if(Input.GetKey (KeyCode.S)==true)
		{
			
			
			transform.Translate (Vector3.forward * 3f);		
			
		}
		
		//if(Input.GetKey (KeyCode.A)==true)
		//{
			
			
			//transform.Translate(transform.right * minspeed * Time.deltaTime);
		
			//applyDefault = false;
		//}
		
		if(applyDefault)
		{
			AudioSource.PlayClipAtPoint(EngineLoop, Camera.mainCamera.transform.position);
				
			transform.Translate(transform.right * speed * Time.deltaTime);
			
			speed = speed += accelrate;
			
		}
			
		
	}
	void OnTriggerEnter(Collision crashslow)
	{
		if(crashslow.gameObject.tag == "Hazards")
		{
			speed = speed += crashslowrate;
		}	
	}
	
	
	
	

}
2

Your code:

//Incorrect, will not be called even if you
//setup the trigger mechanism correctly
void OnTriggerEnter(Collision crashslow) {
   ...
}

Correction:

void OnTriggerEnter( Collider other ) {
   ...
}

Read the collision matrix table in this page to make sure that you have setup your trigger mechanism correctly.

3

If Chronos-L’s solution doesn’t completely fix the problem then…

Try adding a rigidbody to the trigger object. If that doesn’t work then set the rigidbody to Continuous or Continuous Dynamic. You would only need a rigidbody on the trigger object if it’s actually moving. If your vehicle is moving and doesn’t have a rigidbody, then add one to it.