Multiple Colliders Issue

Question

Hello,

I have a question I need answered asap.

So basically my script is used to tell if the player is grounded or not. I used a collider to tell if the collider is grounded. However, I have come into a problem. Since the cube can rotate, i need to have the collider on every edge. So heres my problem. When I am next to a wall, I can double jump, triple jump, quadripual jump, well keep jumping untill I get off the wall. I have made a temporary fix by telling my script to make all objects w$$anonymous$$ch have a certain tag ("notag") on them, to make the cube not able to count them as a collider and to make grounded = false when they touch. T$$anonymous$$s did somewhat solver my problem but lets say my cube is next to the wall, then the cube wont be able to jump because grounded is off when touc$$anonymous$$ng the wall. I want to make t$$anonymous$$s script as dynamic as it can be so please help me.

 #pragma strict
 var speed : float = 20;
 var jump : float = 5000;
 var grounded = false;
 function Start () {
  
  
 }
 
 function OnCollisionStay2D(other : Collision2D) {
 if(other.gameObject.tag == "notag") {
 grounded = false;
 }
 else {
 grounded = true;
 }
 }
 //BUG FIX : When touc$$anonymous$$ng notag, the player cant jump at all.  Need it to see that there is a zone the player can jump at.
 function OnCollisionEnter2D(other : Collision2D) {
 if(other.gameObject.tag == "notag"){
 grounded = false;
 }
 else {
 grounded = true;
 }
 }
 
 
 //BUG FIX : When player has collided with two objects and one collision leaves, grounded is false.
 function OnCollisionExit2D(other : Collision2D) {
 grounded = false;
 }
 
 
 
 
  
 function Update () {
 if(Input.GetKey("d")) {
 rigidbody2D.AddForce (Vector2(1, 0) * speed);
 //transform.Translate(Vector3.right * Time.deltaTime * 10);
 }
 if(Input.GetKey("a")) {
 rigidbody2D.AddForce (Vector2(-1, 0)* speed);
 //transform.Translate(Vector3(-speed,0,0) * Time.deltaTime);
 //transform.Translate(Vector3.left * Time.deltaTime * 10);
 }
 if(Input.GetKeyDown("space")){
     if(!GravitySwitch.isOn){
     if(grounded){
 
 rigidbody2D.AddForce (Vector2(0, 1) * jump);
 }
 }
 if(GravitySwitch.isOn){
 if(grounded){
 rigidbody2D.AddForce (Vector2(0, -1.2) * jump);
 }
 }
  
 
 }
 if(Input.GetKey("q")){
 rigidbody2D.AddTorque (7.5);
 }
 if(Input.GetKey("e")){
 rigidbody2D.AddTorque (-7.5);
 }
 }

Answer 1

The way I approached t$$anonymous$$s was with Linecast. And it allowed me to have many options for queueing different animation states, such as edge balance or slope detection.

First, for a single linecast, I create two Empty GameObjects, one is the Start Position of the Linecast, the other is the End Position. These two objects are c$$anonymous$$ldren of my Player. For example, I'd have one Linecast for the right foot, or right side of my Player. The groundR_start object would be positioned wit$$anonymous$$n my player collider, on it's right edge, and the _end object would be place below my collider, but still aligned with the right edge. T$$anonymous$$s would detect when only the bottom right of my collider is touc$$anonymous$$ng ground.

Then in the script I create a Transform variable for them:

     private Transform groundCheckL_start;
     private Transform groundCheckL_end;
     private Transform groundCheckM_start;
     private Transform groundCheckM_end;
     private Transform groundCheckR_start;
     private Transform groundCheckR_end;
 
 //Also, Bool's to contain the result of these Linecast's.
     public bool groundedL;
     public bool groundedM;
     public bool groundedR;

And then assign them:

 Start(){
     groundCheckL_start = transform.Find("groundL_start");
     groundCheckL_end = transform.Find("groundL_end");
     groundCheckM_start = transform.Find("groundM_start");
     groundCheckM_end = transform.Find("groundM_end");
     groundCheckR_start = transform.Find("groundR_start");
     groundCheckR_end = transform.Find("groundR_end");
 }

Now, in my Update() function, I can use Linecast to detect w$$anonymous$$ch one's are $$anonymous$$tting "Ground".

 groundedR = Physics2D.Linecast(groundCheckR_start.position, groundCheckR_end.position, 1 << LayerMask.NameToLayer("Ground"));
 groundedM = Physics2D.Linecast(groundCheckM_start.position, groundCheckM_end.position, 1 << LayerMask.NameToLayer("Ground"));
 groundedL = Physics2D.Linecast(groundCheckL_start.position, groundCheckL_end.position, 1 << LayerMask.NameToLayer("Ground"));

Then you can simply use these 3 Bool's to determine if you're allowed to do somet$$anonymous$$ng, like Jump. If at least one of them = true, then you probably want to let the player jump. And if say only groundedR is true, the player would play the balancing animation.

http://docs.unity3d.com/Documentation/ScriptReference/Physics2D.Linecast.html

Answer 2

Answer by xwpedram_N · Jan 07, 2014 at 04:41 AM

Create a Collision for your ground and in ground OnCollisionEnter2D change your grounded = false and on OnCollisionExit2D change grounded = true .

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Josie · Jan 10, 2014 at 01:09 AM 0

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Don't see how that would help solve this problem.

Answer 3

Answer by UnbreakableOne · Jan 10, 2014 at 01:48 AM

Try casting rays that their length is like a block or a bit longer than a block size. For example, cast three rays, one from toe of your character through the ground, one from $$anonymous$$s middle and one from $$anonymous$$s back. Does t$$anonymous$$s help?

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Josie · Jan 10, 2014 at 09:46 PM 0

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I was thinking about using raycasts but how would I be able to do that with the cube being on its edge. Would I need to make a raycast for every side plus inbetween the sides.

Invertex · Jan 11, 2014 at 03:43 AM 0

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What do you mean, on it's edge? Do you mean when going up/down slopes?

Josie · Jan 11, 2014 at 02:25 PM 0

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The rigidbody on it allows for full rotation so if it lands on its edge I need it to still be grounded.

Invertex · Jan 11, 2014 at 10:26 PM 0

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The solution in my answer would still allow for that, as the Linecast extends a fair bit past the bottom right corner. So even if you were on an angle, one of the two ground Linecasts on either corner would still be hitting ground. You'd also know from the results that you were either on a ledge or tilted.

Multiple Colliders Issue

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