Saves both projection and modelview matrices to the matrix stack.

Changing modelview or projection matrices overrides current camera's parameters. These matrices can be saved and restored using GL.PushMatrix and GL.PopMatrix.

See Also: PopMatrix function.

	// Draw a yellow line from the botton left to the
	// top right of the screen
	var mat : Material;
	function OnPostRender() {
		if (!mat) {
			Debug.LogError("Please Assign a material on the inspector");
			return;
		}
		GL.PushMatrix(); // Save the current state
		mat.SetPass(0);
		GL.LoadPixelMatrix();
		GL.Color(Color.yellow);
		GL.Begin(GL.LINES);
		GL.Vertex3(0,0,0);
		GL.Vertex3(Screen.width, Screen.height,0);
		GL.End();
		GL.PopMatrix(); // Pop changes.
	}

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.LoadPixelMatrix();
        GL.Color(Color.yellow);
        GL.Begin(GL.LINES);
        GL.Vertex3(0, 0, 0);
        GL.Vertex3(Screen.width, Screen.height, 0);
        GL.End();
        GL.PopMatrix();
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public mat as Material

	def OnPostRender() as void:
		if not mat:
			Debug.LogError('Please Assign a material on the inspector')
			return
		GL.PushMatrix()
		mat.SetPass(0)
		GL.LoadPixelMatrix()
		GL.Color(Color.yellow)
		GL.Begin(GL.LINES)
		GL.Vertex3(0, 0, 0)
		GL.Vertex3(Screen.width, Screen.height, 0)
		GL.End()
		GL.PopMatrix()