Version: 2019.2
  • C#


Suggest a change


Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.


Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.



public static int LINES;


Mode for Begin: draw lines.

Draws lines between each pair of vertices passed. If you pass four vertices, A, B, C and D, two lines are drawn: one between A and B, and one between C and D.

To set up the screen for drawing in 2D, use GL.LoadOrtho or GL.LoadPixelMatrix. To set up the screen for drawing in 3D, use GL.LoadIdentity followed by GL.MultMatrix with the desired transformation matrix.

See Also: GL.Begin, GL.End.

using UnityEngine;

public class Example : MonoBehaviour { // Draws a line from "startVertex" var to the curent mouse position. Material mat; Vector3 startVertex; Vector3 mousePos;

void Start() { startVertex =; }

void Update() { mousePos = Input.mousePosition; // Press space to update startVertex if (Input.GetKeyDown(KeyCode.Space)) { startVertex = new Vector3(mousePos.x / Screen.width, mousePos.y / Screen.height, 0); } }

void OnPostRender() { if (!mat) { Debug.LogError("Please Assign a material on the inspector"); return; } GL.PushMatrix(); mat.SetPass(0); GL.LoadOrtho();

GL.Begin(GL.LINES); GL.Color(; GL.Vertex(startVertex); GL.Vertex(new Vector3(mousePos.x / Screen.width, mousePos.y / Screen.height, 0)); GL.End();

GL.PopMatrix(); } }