Adding a Roation Variable to Control Rotation Speed

Question

I have this code that looks at a target with 2 axis's. Works great when all rigged up, but I would like to be able to control the rotation speed of both axis's. I think I would need to use a Lerp but not sure how to go about it. Add to this code or just have to come up with a different code.

CODE...

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 [System.Serializable]
 public class TurretRotate //turrets variables to rotate and look at target, 2 axis
 {
     public Transform horizontalAxis;
     public Transform verticalAxis;
     public Transform currentTarget;
 }
 
 public class TurretControl : MonoBehaviour
 {
 void Update()
     {
                 LookAtTarget ();
         }
 void LookAtTarget()
     {
         Vector3 targetDirection = TR.verticalAxis.InverseTransformPoint(TR.currentTarget.position);// - verticalAxis.position;
         targetDirection.y = 0;
         targetDirection = TR.verticalAxis.TransformPoint(targetDirection);
         TR.verticalAxis.LookAt(targetDirection, TR.verticalAxis.up);
         TR.horizontalAxis.LookAt(TR.currentTarget,TR.horizontalAxis.up);
     }
 }

Thanks for your time in reading this question.

James

Answer 1

The ~easiest~ way that I can think of doing this is using a couple of the builtin Quaternion class methods, namely Quaternion.LookRotation which returns the rotation that LookAt will produce, and Quaternion.RotateTowards which moves between two rotations at a given speed.

 float rotationSpeed = 90f; //90degrees per second in each axis
 
 void LookAtTarget(){
     Vector3 targetDirection = TR.verticalAxis.InverseTransformPoint(TR.currentTarget.position);
     
     targetDirection.y = 0;
     
     targetDirection = TR.verticalAxis.TransformPoint(targetDirection);
     
     Quaternion vTarg = Quaternion.LookRotation(targetDirection, TR.verticalAxis.up);
     TR.verticalAxis.rotation = Quaternion.RotateTowards(TR.verticalAxis.rotation, vTarg, rotationSpeed*Time.deltaTime);
     
     Quaternion hTarg = Quaternion.LookRotation(TR.currentTarget,TR.horizontalAxis.up);
     TR.horizontalAxis.rotation = Quaternion.RotateTowards(TR.horizontalAxis.rotation, hTarg, rotationSpeed*Time.deltaTime);
 }

EDIT

so looking at your setup here is a revised script:

 public float rotationSpeed = 90f; //90degrees per second in each axis
 
 public Transform horizontalAxis; //rotate to tilt
 public Transform verticalAxis; //rotate to pan
 public Transform currentTarget;
 
 void Update(){
     LookAtTarget();
 }
 
 void LookAtTarget(){
     Vector3 panDir = currentTarget.position - horizontalAxis.position;
     panDir.y = 0;
     Quaternion vTarg = Quaternion.LookRotation(panDir, verticalAxis.up); //calculate the rotation around the vertical axis
     
     Vector3 curFwdDir = Quaternion.Inverse(verticalAxis.rotation)*horizontalAxis.forward; //find the local forward direction of the horizontalAxis
     
     Vector3 targTiltDir = currentTarget.position - horizontalAxis.position;
     targTiltDir.z = Mathf.Sqrt(targTiltDir.x*targTiltDir.x + targTiltDir.z*targTiltDir.z);
     targTiltDir.x = 0; //find the z-aligned direction of the target for comparison with curFwdDir (you can use Debug.DrawRay, if you want to see what these are doing)
     
     Quaternion hTarg = Quaternion.LookRotation(targTiltDir); //get the rotation solely on the horizontal axis
     
     //rotate over time at 'rotationSpeed' degrees per second
     verticalAxis.rotation = Quaternion.RotateTowards(verticalAxis.rotation, vTarg, rotationSpeed*Time.deltaTime);
     horizontalAxis.localRotation = Quaternion.RotateTowards(horizontalAxis.localRotation, hTarg, rotationSpeed*Time.deltaTime);
 }

There might be an easier way of doing this, the only bit I don't particularly like about this is calculating 'targTiltDir' but that is still ~mathematically correct~ so it shouldn't give any problems, just might not be such aesthetic code!

Hope that helps!

Scribe

Adding a Roation Variable to Control Rotation Speed

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