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Question by bogs101 · Dec 23, 2017 at 04:00 AM · raycastrotatemovesincos

Raycast moves away from object when object is rotated.

i have a game object with a script attached. I am casting a series of rays around the object. The problem is that when i move the object away from world origin and rotate it this causes the ray direction to move in the opposite direction. The problem doesn't occur if I move the object or rotate the object. It only happens when i do both. Here's the code. Thanks in advance.

      for (int i = 0; i < NumOfRays; i++) {
         x = Mathf.Sin (angle);
         z = Mathf.Cos (angle);
         angle += 2 * Mathf.PI / NumOfRays;

         Vector3 dir = transform.TransformDirection( new Vector3 (transform.position.x + x, 0, transform.position.z + z));
         Debug.DrawLine (transform.position, dir, Color.red);

         if (Input.GetKeyDown(KeyCode.UpArrow))
         rb.AddForce (Vector3.forward);
     }
     angle = 0;
 }
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Answer by ElijahShadbolt · Dec 23, 2017 at 04:09 AM

The line should be

 Vector3 dir = transform.TransformDirection(new Vector3(x, 0, z));

because TransformDirection takes in a local space direction and outputs a world space direction (where the vector has been rotated by transform.rotation).

Also use Debug.DrawRay instead of DrawLine.

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avatar image bogs101 · Dec 23, 2017 at 09:01 AM 0
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Thank you, Stupid me didn't read your response properly. so i spent he last hour remaining confused. Thanks again.

avatar image ElijahShadbolt bogs101 · Dec 23, 2017 at 11:56 PM 0
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Happy to help! Don't call yourself stupid or idiot just because you don't know something. You are making an active effort to learn new things and increase your knowledge! $$anonymous$$eep up the good curiosity!

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