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Question by smirlianos · Jan 20, 2013 at 12:38 PM · javascriptrigidbodyinstantiatespawnerdirections

Why does the bullet has wrong direction?

I have this script attached to a gun, that shoots a sphere(bullet) from an empty GameObject named "Spawner" in front of it. The problem is that when I press the mouse button, the bullet has a wrong direction, as the image shows bellow. Why is this happening?


Preview:

alt text


This is the script that I use:

 #pragma strict
 var bulletPref : Rigidbody;
 var bulletPos : Vector3;
 var spawner : GameObject;
 
 function Start () {
 
 }
 
 function Update () {
 bulletPos = spawner.transform.position;
     if(Input.GetMouseButtonDown(0))
     {
         var clone : Rigidbody;
         clone = Instantiate(bulletPref, bulletPos, transform.rotation);
         clone.velocity = transform.TransformDirection (Vector3.forward * 20);
     }
 
 }
preview.png (75.7 kB)
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avatar image kat0r · Jan 20, 2013 at 01:20 PM 0
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Does the "Pistol" transform have any rotation?

avatar image smirlianos · Jan 20, 2013 at 02:33 PM 0
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No, it's all set to 0

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Answer by aldonaletto · Jan 20, 2013 at 02:58 PM

The bullet should go in the forward direction of the object to which this script is attached (Pistol, I presume). If it's being deviated, maybe the bullet collider is touching some other collider at the spawner position (the player, the pistol model etc.)- this would result in an altered trajectory.
NOTE: Usually, in a first person game the weapon is childed to the camera, so that the player shoots in the direction he's looking at.

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avatar image smirlianos · Jan 20, 2013 at 03:48 PM 0
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It doesn't collide with anything, I have tried to put the spawner in a lot of positions, but always it shoots in the wrong diraction :(

avatar image aldonaletto · Jan 20, 2013 at 07:57 PM 1
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Weird thing! It should follow in the forward direction of the script owner object. Try to add a debug line in Update:

      clone.velocity = transform.TransformDirection (Vector3.forward * 20);
      Debug.DrawRay(clone.velocity, Color.red, 2);

This draws a red line for 2 seconds in the direction the bullet should go. NOTE: Click the button gizmos in the Game view, or no lines will appear.

avatar image smirlianos · Jan 21, 2013 at 01:16 PM 0
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Thanks, but I solved it, I had a script attached to the bullet that affected the direction!!!

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