What about pp edge detection shader, like sobel?

[Linked Image]

Code
#include <acknex.h>
#include <default.c>
#include <mtlView.c>

#define PRAGMA_PATH "%EXE_DIR%\templates\models";

action ent_act()
{
	while(1)
	{
		my.pan+=3*time_step;
		my.tilt+=3*time_step;
		wait(1);
	}
}
function main()
{
	video_mode=10;
	level_load("");
	ent_create(CUBE_MDL,vector(300,0,0),ent_act);
	ent_create("ball.mdl",vector(300,-50,0),ent_act);
	ent_create("sf_women.mdl",vector(300,50,0),ent_act);
	
	pp_set(camera,mtl_sobel);
	
}