How to reduce the speed of rotation?

Question

I have a circle sprite which is constantly rotating, however it rotates way to fast. I have tried increasing the 'WaitForSeconds' but anything above 0.01 gives a choppy movement. Anyone know how to do this? Thanks

 IEnumerator rotate ()
 {
     transform.rotation = Quaternion.Euler(0f, 0f, -4f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -14f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -24);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -34f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -44f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -54f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -64f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -74f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -84f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -94f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -104f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -114f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -124f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -134f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -144f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -154f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -164f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -174f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -184f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -194f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -204f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -214f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -224f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -234f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -244f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -254f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -264f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -274f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -284f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -294f);
     yield return new WaitForSeconds(0.03f);
     transform.rotation = Quaternion.Euler(0f, 0f, -304f);
     yield return new WaitForSeconds(0.03f);
     transform.rotation = Quaternion.Euler(0f, 0f, -314f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -324f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -334f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -344f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -354f);
     yield return new WaitForSeconds(0.01f);
     transform.rotation = Quaternion.Euler(0f, 0f, -364f);
     yield return new WaitForSeconds(0.01f);
     StartCoroutine("rotate");





 }

Answer 1

Answer by Eno-Khaon · Jan 30, 2016 at 04:35 AM

Let's condense this a little bit, shall we?

 IEnumerator rotate ()
  {
      while(true) // Keeps it going, use yield statements to avoid infinite loop
      {
          transform.rotation *= Quaternion.AngleAxis(degreesPerSecond * Time.deltaTime, Vector3.forward);
          yield return null;
      }
  }

For reference, I use "yield return null" for reasons described in another answer ^{(This one)}. The rotation rate is calculated based on degrees rotated per second, which can be hard-coded or given a variable (as desired), and the rotation axis should be in world coordinates rather than local coordinates to maintain proper order of operations in Quaternion multiplication.

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Owen-Reynolds · Jan 30, 2016 at 03:35 PM 0

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Yes, use a loop. The thing is, if you (the original poster) didn't already know that, get any book about computer program$$anonymous$$g (not Unity -- just a basic book.) It will have a bunch of easy stuff in it, like loops, which you didn't know.

This answer is rewriting your code a lot. It's a more normal way to slowly spin. But you could also make a loop that keeps the same 2 lines you wrote.

Answer 2

Answer by DroidifyDevs · Jan 30, 2016 at 03:53 PM

OK. If you have a script that is THAT REPETITIVE, YOU'RE DOING SOMETHING WRONG.

You're getting choppy results because you are spinning it only 10 degrees at a time. So, you're doing this: -4, -14, -24, -34, -44, -54 etc... meaning that it is 10 times choppier than it would be if you used a loop.

So, to save yourself the PITA of copying code 360 times, learn how to use loops. @Eno Khaon did a good job with his answer, and I clarified why it is so choppy.

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How to reduce the speed of rotation?

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