Debug.DrawLine

Parameters

Description

Draws a line between specified start and end points.

The line will be drawn in the Game view of the editor when the game is running and the gizmo drawing is enabled. The line will also be drawn in the Scene when it is visible in the Game view. Leave the game running and showing the line. Switch to the Scene view and the line will be visible.

The duration is the time (in seconds) for which the line will be visible after it is first displayed. A duration of zero shows the line for just one frame.

Note: This is for debugging playmode only. Editor gizmos should be drawn with Gizmos.Drawline or Handles.DrawLine instead.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    void Start()
    {
        // draw a 5-unit white line from the origin for 2.5 seconds
        Debug.DrawLine(Vector3.zero, new Vector3(5, 0, 0), Color.white, 2.5f);
    }

    private float q = 0.0f;

    void FixedUpdate()
    {
        // always draw a 5-unit colored line from the origin
        Color color = new Color(q, q, 1.0f);
        Debug.DrawLine(Vector3.zero, new Vector3(0, 5, 0), color);
        q = q + 0.01f;

        if (q > 1.0f)
        {
            q = 0.0f;
        }
    }
}

using UnityEngine;

public class Example : MonoBehaviour
{
    // Event callback example: Debug-draw all contact points and normals for 2 seconds.
    void OnCollisionEnter(Collision collision)
    {
        foreach (ContactPoint contact in collision.contacts)
        {
            Debug.DrawLine(contact.point, contact.point + contact.normal, Color.green, 2, false);
        }
    }
}