GL.LoadOrtho

Description

Helper function to set up an ortho perspective transform.

After calling LoadOrtho, the viewing frustum goes from (0,0,-1) to (1,1,100).
LoadOrtho can be used for drawing primitives in 2D.

    // Draws a triangle over an already drawn triangle
    var mat : Material;

    function OnPostRender() {
        if (!mat) {
            Debug.LogError("Please Assign a material on the inspector");
            return;
        }
        GL.PushMatrix();
        mat.SetPass(0);
        GL.LoadOrtho();
        GL.Color(Color.red);
        GL.Begin(GL.TRIANGLES);
        GL.Vertex3(0.25,0.1351,0);
        GL.Vertex3(0.25,0.3,0);
        GL.Vertex3(0.5,0.3,0);
        GL.End();
        GL.Color(Color.yellow);
        GL.Begin(GL.TRIANGLES);
        GL.Vertex3(0.5,0.25,-1);
        GL.Vertex3(0.5,0.1351,-1);
        GL.Vertex3(0.1,0.25,-1);
        GL.End();
        GL.PopMatrix();
    }

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Material mat;
    void OnPostRender() {
        if (!mat) {
            Debug.LogError("Please Assign a material on the inspector");
            return;
        }
        GL.PushMatrix();
        mat.SetPass(0);
        GL.LoadOrtho();
        GL.Color(Color.red);
        GL.Begin(GL.TRIANGLES);
        GL.Vertex3(0.25F, 0.1351F, 0);
        GL.Vertex3(0.25F, 0.3F, 0);
        GL.Vertex3(0.5F, 0.3F, 0);
        GL.End();
        GL.Color(Color.yellow);
        GL.Begin(GL.TRIANGLES);
        GL.Vertex3(0.5F, 0.25F, -1);
        GL.Vertex3(0.5F, 0.1351F, -1);
        GL.Vertex3(0.1F, 0.25F, -1);
        GL.End();
        GL.PopMatrix();
    }
}

See Also: GL.LoadProjectionMatrix.