Question by H3core · Jan 11, 2013 at 04:42 AM · 2d rotation

Unity Car Tutorial Rotate Snippet Chaos

So, i took this little code snippet from the Unity's Car Tutorial to rotate my 2D Car Game Wheels, for accurate rotation:

     w.wheelVelo = rigidbody.GetPointVelocity(wh.point);
     w.groundSpeed = w.wheelGraphic.InverseTransformDirection(w.wheelVelo);
                         print (w.wheelVelo);
                         print (w.groundSpeed.x);
                         print (w.groundSpeed.y);
  //w.wheelGraphic.Rotate(Vector3.forward * (-w.groundSpeed.x / wheelRadius) * Time.deltaTime * Mathf.Rad2Deg);

And in the Debug the values printed look like so:

(13.8, 0.0, 0.0) 13.80005 -0.00028884

(17.2, 0.0, 0.0) 17.20007 -0.0003456686

Looking perfect for a 2D game being left, right (x-axis), up, down (y-axis), so whats the problem...... The catch is that the rotate part is actually commented

If the comment is removed these are the values returned:

(19.4, 0.0, 0.0) 3.437649E-05 19.40008

(20.9, 0.0, 0.0) 4.99693E-05 20.90008

And guess what it doesn't end there if i change the groundspeed from .x to .y like so to fix that bug in value:

 w.wheelGraphic.Rotate(Vector3.forward * (-w.groundSpeed.y / wheelRadius) * Time.deltaTime * Mathf.Rad2Deg);

Guess what, you guessed right, the values returned are now are :

(15.7, 0.0, 0.0) 15.70005 -0.005213013

(16.7, 0.0, 0.0) -16.70006 -0.001558624

So, where does this leave us, to WTF, and me hoping im blind to something cause ive been scripting the whole day, trying hard to believe that that is no hidden unity button thats called F-Over user for some fun, and trying even harder not to say UNITY is F-IN STUPID.

Any help, insight to this wonderful encounter to Unity's Daily Coding Shafts as i would like to call it, probably fit for a YouTube Series name, it would be really great :)

Until then have a great day, and please find a way this is reported to Unity Developers

Thanks

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