koobas.hobune.stream
Can I instantiate a collision with a plane?
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;
}
}
}
You seem to be using this idiom quite a lot:
variable = variable += increment;
Are you sure that's what you want to do? The += operator gets expanded into this:
variable = variable + increment;
which means that your line actually looks like this:
variable = variable = variable + increment
While the result of that line is no different from the simpler version, it would be clearer if you simply used either
variable += increment;
or
variable = variable + increment;
not both.
You say you are using a "Plane" why would you do that? I would have thought a box collider was much more likely to work - a plane will be one directional and easily passed through by a fast moving object.
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.
Note the parameter type, OnTrigger*() functions have a Collider as their parameter, while OnCollision*() have Collision
And the name of the variable does not matter, only the type which in this case is Collider. So it could be (Collider whatchamacallit) and it would still be fine.
However, you need to make sure not to use the same variable name as the $$anonymous$$onoBehaviour you are inheriting from, a typical mistake would be na$$anonymous$$g a Collider for the trigger collider: void OnTriggerEnter( Collider collider ), but that will conflict with the collider in the $$anonymous$$onoBehaviour
It shouldn't conflict at all, at least not in C#. If you use collider as the parameter and you want to access the $$anonymous$$onoBehaviour's collider variable then you just put this.collider.
I knew us English speakers had it rough :) Just think of our limits on variable names - which is why most of $$anonymous$$e look like:
somethingThatIsActuallyQuiteImportant += 1;
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.
