Legacy Documentation: Version 5.4
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Vector3.ClampMagnitude

public static Vector3 ClampMagnitude(Vector3 vector, float maxLength);

Parameters

Description

Returns a copy of vector with its magnitude clamped to maxLength.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public Vector3 centerPt; public float radius; void Update() { Vector3 movement = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical")); Vector3 newPos = transform.position + movement; Vector3 offset = newPos - centerPt; transform.position = centerPt + Vector3.ClampMagnitude(offset, radius); } }