How can I multiply the rotation of a mirrored object?

Question

Hi everyone,
I am currently working on a mechanic in which I have an object that mirrors it's rotation to another object. The rotation of the mirrored object object get multiplied by a variable number and can also be below one. This makes a problem however.

Lets say the multiplier has a value of 0.5. This means that if the main object has a rotation of 180 degrees on a specific axis, the mirrored object has 180 x 0.5 = 90 degrees on that same axis. This works as intended, but I get against a hurdle when the rotation rotates higher than 360 degrees. Because Unity sets the next degrees of 360 to 0 instead of 361, the mirrored object will multiply 0 x 0.5 = 0 instead of 361 x 0.5 = 180.5 which causes the problem that is snaps to another unintended angle.

Does anyone have any experience in solving this issue? There probably is an easy fix that I haven't thought of ;)

Thanks!

Answer 1

Best Answer

Answer by VadimMinsk · Mar 02, 2020 at 02:55 PM

I would suggest using deltas instead of absolute angle, if possible. Here's an example that takes delta motion per frame and applies it to another transform.

 public class RotatorRepeater : MonoBehaviour
 {
   public Transform Mirrored;
   public float Ratio = 1.0f;
 
   Quaternion LastRotation;
 
   private void OnEnable()
   {
     LastRotation = transform.localRotation;
   }
 
   void Update()
   {
     float angle;
     Vector3 axis;
     Quaternion DeltaRotation = Quaternion.Inverse(LastRotation) * transform.localRotation;
     DeltaRotation.ToAngleAxis(out angle, out axis);
     if (Mirrored)
     {
       Mirrored.transform.localRotation *= Quaternion.AngleAxis(angle * Ratio, axis);
     }
     LastRotation = transform.localRotation;
   }
 }

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JenoahKers · Mar 03, 2020 at 08:08 AM 0

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Thanks!

This works as I needed. I probably should read into deltas a bit more ;) Have a nice day!

How can I multiply the rotation of a mirrored object?

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