ray cast not working ?

Question

im trying to cast a ray from my player that will detect object it touches a certain length in front of him. i swear my code is fine but i cant get it to work

var xDirection = 15; var yDirection = 0; var zDirection = 45; var length = 0.1; var hit : RaycastHit;

function Update () { var diagonal = transform.TransformDirection (Vector3(xDirection,yDirection,zDirection)); Debug.DrawRay(transform.position, diagonal * length,Color.green);

if (Physics.Raycast(transform.position, diagonal,length)) { Debug.Log ("There is something in front of the object!"); }

}

help would be great :)

EDIT ANOTHER PROBLEM.....

var Bullet1_direction = Vector3(15,0,45); var Bullet2_direction = Vector3(0 ,0,1); var Bullet3_direction = Vector3(-9 ,0,45); var length = 4;

function Update () { var Bullet1_diagonal = transform.TransformDirection(Bullet1_direction); Bullet1_diagonal.Normalize();

var Bullet2_diagonal = transform.TransformDirection(Bullet2_direction); Bullet2_diagonal.Normalize();

var Bullet3_diagonal = transform.TransformDirection(Bullet3_direction); Bullet3_diagonal.Normalize();

Debug.DrawRay(transform.position, Bullet1_diagonal  length,Color.green); Debug.DrawRay(transform.position, Bullet2_diagonal  length,Color.red); Debug.DrawRay(transform.position, Bullet3_diagonal * length,Color.blue);

if (Physics.Raycast(transform.position, Bullet1_diagonal,length)) { Debug.Log ("Bullet 1 hit green!"); } if (Physics.Raycast(transform.position, Bullet2_diagonal,length)) { Debug.Log ("Bullet 2 hit red!"); } if (Physics.Raycast(transform.position, Bullet3_diagonal,length)) { Debug.Log ("Bullet 3 hit blue!"); }

}

HELP PLEASE... @Bunny83

Answer 1

Best Answer

Answer by Bunny83 · Apr 21, 2011 at 09:58 AM

I would say your problem is your direction. If you use Raycast with a length the direction is normalized! That means your ray is 0.1 units long. But if you draw your ray with diagonal * length the drawn ray will be 4.743 units long since your direction is 47,43... long. I don't even understand your direction. It's forward but a bit to the right? Try diagonal.Normalize(); or .normalized.

var direction = Vector3(15,0,45); var length = 0.1;

function Update () {
    var diagonal = transform.TransformDirection(direction);
    diagonal.Normalize();
    Debug.DrawRay(transform.position, diagonal * length,Color.green);

 if (Physics.Raycast(transform.position, diagonal,length)) {
     Debug.Log ("There is something in front of the object!");
 }

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Chris 35 · Apr 21, 2011 at 11:06 AM 0

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THANK YOU SO MUCH :D it worked :) i dont think i would ever of figured that out :P Thanks a million

Chris 35 · Apr 22, 2011 at 05:35 AM 0

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could you please have a look at this bit of code, i cant get it to work im having the same problem with the numbers having to be decimal to get right distance rather then full numbers

Bunny83 · Apr 23, 2011 at 02:33 AM 0

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Sorry, i'm not at home ;) but i don't get what's your problem? If your problem is that you want to declare a float variable instead of an int, just add ".0" to your number. That will turn the variable into a float. var length = 4.0; You can even declare the type explicitly with: var length : float = 4.0;

Answer 2

Answer by MC HALO · Apr 21, 2011 at 03:18 AM

i think you forgot the hit :

var xDirection = 15; var yDirection = 0; var zDirection = 45; var length = 0.1; var hit : RaycastHit;

function Update () { var diagonal = transform.TransformDirection (Vector3(xDirection,yDirection,zDirection)); Debug.DrawRay(transform.position, diagonal * length,Color.green);

if (Physics.Raycast(transform.position, diagonal,hit,length)) { Debug.Log ("There is something in front of the object!"); } }

hope it works

have you attached it to the right player? if you still can not get it to work send it to me to my e-mail and i can look at it for you. the project folder this is.

My e-mail:

Hotmail- gto_oni-eyes@hotmail.com

google:

Hummad.Nazir@gmail.com

i hope to hear from you :)

try my code:

public var RayCastHitDoor :float = 5.0f;

// Update is called once per frame

function Update () {

var hit : RaycastHit ;

 Debug.DrawRay(transform.position, Vector3.forward * RayCastHitDoor, Color.red);

     if(Physics.Raycast(transform.position , Vector3.forward, hit, RayCastHitDoor))

 {

     Debug.DrawRay(transform.position,Vector3.forward * RayCastHitDoor , Color.green);

            if(hit.collider.gameObject.tag == "put your obj name in here "){


                // then do something. in my case i have told the hit collider to play animation when it collides with the object that is tagged door

     hit.collider.gameObject.animation.Play("Door animation");   



     }



 }

}

instead of having animation you could have Destroy the object if you want to do that i would be like this:

     Destroy(hit..collider.gameObject);

and that should destroy the game object you can do what ever you like :)

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Marowi · Apr 21, 2011 at 03:33 AM 1

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The definition he's used works just as well. Check http://unity3d.com/support/documentation/ScriptReference/Physics.Raycast.html

MC HALO · Apr 21, 2011 at 03:39 AM 0

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yep true that works for me as well

Chris 35 · Apr 21, 2011 at 04:35 AM 1

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ive tried with the hit and with out it still doesn't work :\

MC HALO · Apr 21, 2011 at 05:40 AM 0

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send it to me i will have a look

MC HALO · Apr 21, 2011 at 05:41 AM 0

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here is my e-mail address :

gto_oni-eyes@hotmail.com

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