Unity 2D, Flip Sprite without using a rigidbody

Question

I have made an npc that patrols between random points. A new point is generated, and the enemy's transform is changed to that new point.

I want its sprite to flip based on whether it is moving left or right. I have found examples like this:

 if(myRigidbody.velocity.x >= 0){
    spriteRenderer.flipX = false;
 }
 else {
    spriteRenderer.flipX = true;
 }

But they don't work with my script, even if my npc has a rigidbody. I think its because the rigidbody.velocity.x isnt actually changing, just the transform.position?

So how can I do it without the rigidbody.velocity?

Answer 1

Best Answer

Answer by visca_c · Aug 01, 2019 at 02:22 PM

If you are not using rigidbody velocity, you can just find the delta position of your character, then flip the sprite.

 Vector2 lastPos;   
 void Update()
 {
   Vector2 currentPos = transform.position;
   Vector2 deltaPos = currentPos - lastPos; 

 if(deltaPos.x>=0)
      spriteRenderer.flipX=false;
 else
      spriteRenderer.flipX=true;
 
   lastPos = transform.position;
 }

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I_Am_Err00r · Aug 01, 2019 at 02:31 PM 0

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Genius, love it! Excellent little check for side scrolling games, can't believe I have never seen something like this before!

Vega4Life · Aug 01, 2019 at 03:38 PM 1

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I think this is kind of on the right track, but I don't see a reason to check this every frame. The only time we care about flipping, is when we need a new direction. So I would take out what you have and make a new method with it. Then they can call into it when they change directions. Then ins$$anonymous$$d of doing transform.position - lastPos, it would be (waypoint.position - transform.position). Waypoint being where they are going next.

McStag · Aug 01, 2019 at 06:44 PM 0

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Sick idea using change in position over time. tyty

Jason124 · Jun 06, 2021 at 11:08 PM 0

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I'm getting an error CS0034 Operator '-' is ambiguous on operands of type 'Vector3' and 'Vector2' could you help me?

visca_c Jason124 · Jun 07, 2021 at 09:56 PM 0

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I updated the answer, adding one more variable "currentPos" to handle the casting (Vector3 to Vector2), See if it solves your problem.

Unity 2D, Flip Sprite without using a rigidbody

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