Version: 2018.4
LanguageEnglish
  • C#

GL.Begin

Suggest a change

Success!

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.

Close

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.

Close

Cancel

Declaration

public static void Begin(int mode);

Parameters

mode Primitives to draw: can be TRIANGLES, TRIANGLE_STRIP, QUADS or LINES.

Description

Begin drawing 3D primitives.

In OpenGL this matches glBegin; on other graphics APIs the same functionality is emulated. Between GL.Begin and GL.End it is valid to call GL.Vertex, GL.Color, GL.TexCoord and other immediate mode drawing functions.

You should be careful about culling when drawing primitives yourself. The culling rules may be different depending on which graphics API the game is running. In most cases the safest way is to use Cull Off command in the shader.

See Also: GL.End.

using UnityEngine;

public class Example : MonoBehaviour { // Draws a Triangle, a Quad and a line // with different colors

Material mat;

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

GL.Begin(GL.TRIANGLES); // Triangle GL.Color(new Color(1, 1, 1, 1)); GL.Vertex3(0.50f, 0.25f, 0); GL.Vertex3(0.25f, 0.25f, 0); GL.Vertex3(0.375f, 0.5f, 0); GL.End();

GL.Begin(GL.QUADS); // Quad GL.Color(new Color(0.5f, 0.5f, 0.5f, 1)); GL.Vertex3(0.5f, 0.5f, 0); GL.Vertex3(0.5f, 0.75f, 0); GL.Vertex3(0.75f, 0.75f, 0); GL.Vertex3(0.75f, 0.5f, 0); GL.End();

GL.Begin(GL.LINES); // Line GL.Color(new Color(0, 0, 0, 1)); GL.Vertex3(0, 0, 0); GL.Vertex3(0.75f, 0.75f, 0); GL.End(); GL.PopMatrix(); } }