Limit Camera movement by distance from target

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Hi guys, A quick question...

I have a target and a Camera which moves back and forth (Vector3.forward) but I want to limit the movement with min and max distance from target. When distance from target to camera is 1000 it stops, when distance 6000 camera stops.

What I did so far is using Vector3.ClamMadnitude , but it clamps only maximum distance like radius.

How to restrict camera movement ?

 // Move Camera
             cameraMove = Vector3.forward * touchDistanceDifference * zoomSpeed;
             transform.Translate(cameraMove * Time.deltaTime);
 
             // Find minimal camera position
             Vector3 minPosition = (transform.position - cameraRig.position).normalized * minZoomDistance;
             // Find maximal camera position
             Vector3 maxPosition = (transform.position - cameraRig.position).normalized * maxZoomDistance;
             // Find distance / radius where camera can go
             float movementRange = (maxPosition - minPosition).magnitude;
             // Calculate the distance of the new position from the center point
             Vector3 offset = transform.position - minPosition;
             // Clamp the length to the specified radius / distance
             transform.position = minPosition + Vector3.ClampMagnitude(offset, movementRange);

Answer 1

Best Answer

Answer by DenisIsDenis · Jun 20, 2021 at 04:28 AM

In this case, it is more convenient to implement your "ClampMagnitude" based on two conditions and a vector directed from the target to the camera:

 using UnityEngine;
 
 public class ClampDistance : MonoBehaviour
 {
     public Transform target; // Target object
     public float minDistance = 5, maxDistance = 15;
 
     void Update()
     {
         // vector directed from the target to the camera
         Vector3 direction = transform.position - target.position;
 
         // Our ClampMagnitude
         if (direction.magnitude < minDistance)
         {
             direction = direction.normalized * minDistance;
         }
         if (direction.magnitude > maxDistance)
         {
             direction = direction.normalized * maxDistance;
         }
 
         transform.position = target.position + direction;
     }
 }

You need to assign this script to the camera and then it will be between the minimum and maximum distance from the target.

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Artpen · Jun 20, 2021 at 02:25 PM 0

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Hi @DenisIsDenis thank you for your answer. To be honest I tried it before as well. The problem I have I can't limit the movement ... Even with if statements one allows for another to execute the code.

Not sure how to limit camera m movement.

 // Get vector from target to camera
             Vector3 limitVector = transform.position - cameraRig.position;
             Debug.Log(limitVector.magnitude);
 
             if(limitVector.magnitude > $$anonymous$$ZoomDistance) 
             {
                 // Move Camera
                 cameraMove = Vector3.forward * touchDistanceDifference * zoomSpeed;
                 transform.Translate(cameraMove * Time.deltaTime);
             }
 
             if (limitVector.magnitude < maxZoomDistance) 
             {
                 // Move Camera
                 cameraMove = Vector3.forward * touchDistanceDifference * zoomSpeed;
                 transform.Translate(cameraMove * Time.deltaTime);
             }

Artpen · Jun 20, 2021 at 02:50 PM 1

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Ok Got it to work :) Add a touch limit. to if statement // Get vector from target to camera Vector3 limitVector = transform.position - cameraRig.position; Debug.Log(limitVector.magnitude);

             if(limitVector.magnitude > $$anonymous$$ZoomDistance && touchDistanceDifference > 0) 
             {
                 // Move Camera
                 cameraMove = Vector3.forward * touchDistanceDifference * zoomSpeed;
                 transform.Translate(cameraMove * Time.deltaTime);
             }
 
             if (limitVector.magnitude < maxZoomDistance && touchDistanceDifference < 0)
             {
                 // Move Camera
                 cameraMove = Vector3.forward * touchDistanceDifference * zoomSpeed;
                 transform.Translate(cameraMove * Time.deltaTime);
             }

Limit Camera movement by distance from target

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