Version: 2017.2 (switch to 2017.3b)
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Gizmos.DrawLine

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public static method DrawLine(from: Vector3, to: Vector3): void;
public static void DrawLine(Vector3 from, Vector3 to);

Description

Draws a line starting at from towards to.

    var target : Transform;
    function OnDrawGizmosSelected () {
        if(target != null) {
            // Draws a blue line from this transform to the target
            Gizmos.color = Color.blue;
            Gizmos.DrawLine (transform.position, target.position);
        }
    }
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public Transform target; void OnDrawGizmosSelected() { if (target != null) { Gizmos.color = Color.blue; Gizmos.DrawLine(transform.position, target.position); } } }

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