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Question by Noob_Vulcan · Nov 28, 2014 at 07:39 AM · lookat2d rotation

2D tranform.lookAt Problem

God knows y i always stuck here...2D game

I have a sprite , i want it look at on another object and move towards it. But when i use

 spaceshipTransform.LookAt (_earth);

This rotates the sprite (since LookAt - Rotates the transform so the forward vector points at /target/'s current position.)

So how do i make the sprite just rotate by z axis (so that it looks fine) ?

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avatar image taxvi · Nov 28, 2014 at 07:59 AM 0
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I don't understand your problem

This rotates the sprite

isn't this what you need?

avatar image Noob_Vulcan · Nov 28, 2014 at 08:15 AM 0
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@taxvi

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problem.png (26.1 kB)

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Answer by robertbu · Nov 28, 2014 at 08:20 AM

Construct your sprite so that the front of the sprite is facing right when the rotation of the sprite is (0,0,0). Then you can do:

  var dir =_earth.postion - transform.position;
  var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
  transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);

This assumes that _earth is a transform. If it is a Vector3, just use '_earth' rather than '_earth.position'.

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