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2
Question by nikhil38 · Nov 04, 2012 at 04:08 PM · 2drotationsprite

Rotate a 2D sprite towards target sprite?

Hi guys !

i am making a 2d space shooter . I've got two spaceships , one for player and other for enemy .It's a top down shooting game . I have the player facing top direction and enemy ship facing player that makes enemy at Rotation.z =180 . (upside down)

I'm trying to rotate the enemy sprite towards the player current position and transform towards it .the rotation should be only withing a certain angle window ...i mean it shouldn't be 360 degree rotation..just a sector of 120 degrees .....

But i'm unable to rotate it the way i want...the rotation is not restricted to only z axis with the code i use presently ...

I've just started to learn unity and i ain't that good with trigonometry ...

So help is really needed folks ...

Here's a screenshot !

[1]: /storage/temp/4693-screenshot.png

screenshot.png (270.3 kB)
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avatar image Fattie · Nov 04, 2012 at 04:19 PM 0
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LookAt is a very handy command. also "Rotate" and also "RotateAround"

hope helps!

avatar image nikhil38 · Nov 05, 2012 at 05:36 AM 0
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ahh...i have tried all of these..but nothing seems to work for me...there's rotation but not as i wanted ...

avatar image AlucardJay · Nov 06, 2012 at 09:22 AM -1
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This is what you are looking for :

http://docs.unity3d.com/Documentation/ScriptReference/Quaternion.LookRotation.html

This script is set up so the object transform.forward is looking at the target, with the object transform.up facing to the the negative Z axis :

 #pragma strict
 
 public var thePlayer : Transform;
 private var myTransform : Transform;
 
 function Start() 
 {
     if ( thePlayer == null ) {
         Debug.Log( "thePlayer object is missing - " + gameObject.name + " Inspector" );
         thePlayer = GameObject.FindWithTag("Player").transform;
     }
     myTransform = transform;
 }
 
 function Update() 
 {
     var rot : Quaternion = Quaternion.LookRotation( thePlayer.position - myTransform.position, -Vector3.forward );
     myTransform.rotation = rot;
 }
avatar image AlucardJay · Nov 06, 2012 at 10:08 AM 1
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After re-reading the question I don't think this is what you want. If I now understand correctly, you want to limit the rotation of the ship to within +- 60' of facing down, but still try and look at the ship?

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