Legacy Documentation: Version 5.3
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RaycastHit2D.distance

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public var distance: float;
public float distance;

Description

The distance from the ray origin to the impact point.

#pragma strict
public var direction;
function Update() {
	//Cast a ray in the direction specified in the inspector.
	var hit = Physics2D.Raycast(this.gameObject.transform.position, direction);
	//If something was hit.
	if (hit.collider != null) {
		//If the object hit is less than or equal to 6 units away from this object.
		if (hit.distance <= 6.0f) {
			Debug.Log("Enemy In Range!");
		}
	}
}
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public Vector2 direction;

void Update() { //Cast a ray in the direction specified in the inspector. RaycastHit2D hit = Physics2D.Raycast(this.gameObject.transform.position,direction);

//If something was hit. if ( hit.collider != null ) { //If the object hit is less than or equal to 6 units away from this object. if(hit.distance <= 6.0f) { Debug.Log("Enemy In Range!"); } } } }