How to properly flip 2D character with new Unity4.3 2D framework? (Have problem with animation rotation)

Question

Hello there, i'm already checked official Unity 4.3 example project, and there they use

 Vector3 theScale = transform.localScale;
 theScale.x *= -1;
 transform.localScale = theScale;

This works pretty well, but. But i'm encountered an trouble, not sure this trouble with this Flip or with something else.

I'm use Animator to animate my characters, i have Attack animation, which in addition to the sprite animation also move character's Hand, which can carry the weapon. Problem is when i flip the character to opposite direction hand will move at characters back, which is wrong. (video below will be more descriptive)

I discovered that this problem occure only if i modify the Hand's rotation in animation, so if i works only with .position this works well, but i need the rotation!

What is best way to get this work?

Here the youtube video: http://youtu.be/qpMK2gRgDz8

Answer 1

Best Answer

Answer by TiMMyyMMiT · Nov 25, 2013 at 11:37 PM

Flipping the X-scale will cause issues with child objects (especially colliders). The 3D solution is to rotate your character by 180 degrees along the y-axis which will fix your problems except that 2D colliders do not flip so they will animate incorrecly.

My current fix for the colliders is to set each collider as a child for the GameObject you want:

alt text

Then I manually set the rotation of the collider at each frame:

 void LateUpdate()
 {
     rotation = parent.rotation.eulerAngles;
     rotation.x = rotation.y = 0;
     if (facingRight)
     {
         rotation.z *= -1;
         myTransform.eulerAngles = -rotation + initialOffset;
     }
     else
         myTransform.eulerAngles = -rotation - initialOffset;
 }

Not my favourite solution but currently there is very little you can do as far as flipping complex characters in Unity's 2D right now. The image below shows this working.

By far the easiest approach would be to continue to use the 3D colliders and 3D physics and just rotate your character at 180 around the y-axis

alt text

colliders.png (8.2 kB)

i did it2.png (152.5 kB)

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TiMMyyMMiT · Nov 26, 2013 at 01:14 AM 0

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It is also worth noting that none of this works with rigidbodies. If you plan on using complex colliders and something like ragdolls then just stick with 3D.

baguwka · Nov 26, 2013 at 02:05 AM 0

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Thank you for descriptive answer, this is pretty useful.

robzilla2000 · May 18, 2014 at 05:40 PM 0

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I appreciate the help in the right direction but it would be even better if the answer was complete. What is 'initialOffset' ?

IsaacP · Feb 03, 2015 at 02:01 PM 0

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The value that was initially used to offset the euler angles

How to properly flip 2D character with new Unity4.3 2D framework? (Have problem with animation rotation)

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