GL.wireframe
static var wireframe: bool;
static bool wireframe;
static wireframe as bool
Description

Should rendering be done in wireframe?

Turning on wireframe mode will affect all objects rendered after the call, until you turn wireframe back off. In the Unity editor, wireframe mode is always turned off before repainting any window.

Note that some platforms, for example mobile (OpenGL ES) and Flash (Stage3D) do not support wireframe rendering.
	// Attach this script to a camera, this will make it render in wireframe
	function OnPreRender() {
		GL.wireframe = true;
	}
	function OnPostRender() {
		GL.wireframe = false;
	}
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnPreRender() {
        GL.wireframe = true;
    }
    void OnPostRender() {
        GL.wireframe = false;
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnPreRender() as void:
		GL.wireframe = true

	def OnPostRender() as void:
		GL.wireframe = false