Smoothly Rotate Object Towards Target Object

Question

I want to rotate my player vehicle into the target object direction/side. Though the following image, I have tried to explain my point in a better way:

alt text

I want to rotate my below tank object towards another tank object so that it can point into that direction.

I have written this code for this purpose but it is not working:

 IEnumerator DoRotationAtTargetDirection(Transform opponentPlayer)
 {
     Quaternion targetRotation = Quaternion.identity;
     do
     {
         Debug.Log("do rotation");
         Vector3 targetDirection = opponentPlayer.position - transform.position;
         targetRotation = Quaternion.LookRotation(targetDirection);
         Quaternion nextRotation = Quaternion.Lerp(transform.localRotation, targetRotation, Time.deltaTime);
         transform.localRotation = nextRotation;
         yield return null;
 
     } while (Quaternion.Angle(transform.localRotation, targetRotation) < 0.01f);
 }

I just want to smoothly rotate and stop towards a target object. Please share your suggestion regarding this.

Answer 1

Best Answer

Answer by Hellium · Sep 05, 2019 at 04:20 PM

Quaternion.LookRotation(targetDirection) defines a rotation in world space, but you are trying to change the local rotation of the object. Try:

 Quaternion nextRotation = Quaternion.Lerp(transform.rotation, targetRotation, Time.deltaTime);
 transform.rotation = nextRotation;

But I would use RotateTowards instead

  Vector3 targetDirection = (opponentPlayer.position - transform.position).normalized;
  targetRotation = Quaternion.LookRotation(targetDirection);
  transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation , Time.deltaTime);
  yield return null;

Also, don't forget to change your condition to

 while (Quaternion.Angle(transform.rotation, targetRotation) > 0.01f);

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siddharth3322 · Sep 05, 2019 at 04:25 PM 0

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Still, it's not doing a complete rotation or turning the face towards another target object!!.

siddharth3322 · Sep 05, 2019 at 04:27 PM 0

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This is the updated code that is executing:

  IEnumerator DoRotationAtTargetDirection(Transform opponentPlayer)
     {
         Quaternion targetRotation = Quaternion.identity;
         do
         {
             Debug.Log("do rotation");
 
             Vector3 targetDirection = (opponentPlayer.position - transform.position).normalized;
             targetRotation = Quaternion.LookRotation(targetDirection);
             transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, Time.deltaTime);
 
             yield return null;
 
         } while (Quaternion.Angle(transform.rotation, targetRotation) < 0.01f);
     }

Hellium siddharth3322 · Sep 05, 2019 at 04:34 PM 1

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Didn't see the condition.

Change it to

 while (Quaternion.Angle(transform.rotation, targetRotation) > 0.01f);

You want the object to continue while the object is not aligned with the target rotation.

siddharth3322 Hellium · Sep 05, 2019 at 04:39 PM 0

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You are a genius man :) Thank you so much - can you post updated code as an answer for both questions?

so I can mark this as correct.

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Smoothly Rotate Object Towards Target Object

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