// Draws a Triangle, a Quad and a line
// with different colors

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.Begin(GL.TRIANGLES); // Triangle
    GL.Color(Color(1,1,1,1));
    GL.Vertex3(0.50,0.25,0);
    GL.Vertex3(0.25,0.25,0);
    GL.Vertex3(0.375,0.5,0);
    GL.End(); // End drawing Triangle
    GL.Begin(GL.QUADS); // Quad
    GL.Color(Color(0.5,0.5,0.5,1));
    GL.Vertex3(0.5,0.5,0);
    GL.Vertex3(0.5,0.75,0);
    GL.Vertex3(0.75,0.75,0);
    GL.Vertex3(0.75,0.5,0);
    GL.End(); // End drawing quad
    GL.Begin(GL.LINES); // Line
    GL.Color(Color(0,0,0,1));
    GL.Vertex3(0,0,0);
    GL.Vertex3(0.75,0.75,0);
    GL.End(); // End drawing Line
    GL.PopMatrix();
}

using UnityEngine;
using System.Collections;

public class example : 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.Begin(GL.TRIANGLES);
        GL.Color(new Color(1, 1, 1, 1));
        GL.Vertex3(0.5F, 0.25F, 0);
        GL.Vertex3(0.25F, 0.25F, 0);
        GL.Vertex3(0.375F, 0.5F, 0);
        GL.End();
        GL.Begin(GL.QUADS);
        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);
        GL.Color(new Color(0, 0, 0, 1));
        GL.Vertex3(0, 0, 0);
        GL.Vertex3(0.75F, 0.75F, 0);
        GL.End();
        GL.PopMatrix();
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public mat as Material

    def OnPostRender():
        if not mat:
            Debug.LogError('Please Assign a material on the inspector')
            return
        GL.PushMatrix()
        mat.SetPass(0)
        GL.LoadOrtho()
        GL.Begin(GL.TRIANGLES)
        GL.Color(Color(1, 1, 1, 1))
        GL.Vertex3(0.5F, 0.25F, 0)
        GL.Vertex3(0.25F, 0.25F, 0)
        GL.Vertex3(0.375F, 0.5F, 0)
        GL.End()
        GL.Begin(GL.QUADS)
        GL.Color(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)
        GL.Color(Color(0, 0, 0, 1))
        GL.Vertex3(0, 0, 0)
        GL.Vertex3(0.75F, 0.75F, 0)
        GL.End()
        GL.PopMatrix()