What is Zombie History?
Every time a Zombie is instructed to do something it is logged in the Zombie History for each individual zombie. Normally this is seen through a debugger, but I made a function to print it out in-game.

How Do I View Zombie History?
You'll want to add this line somewhere in your scripts, even the map script is fine:

array_thread( GetSpawnerArray(), ::add_spawn_function, ::zombie_history_print );

Here is the function I wrote that you'll need to copy and paste, I put it in _zombiemode_utility.gsc since almost every script includes it:

zombie_history_print()
{
	/#
	self endon( "death" );

	if ( !IsDefined( self.zombie_history ) )
	{
		self.zombie_history = [];
	}

	last_zombie_history_size = 0;

	while ( true )
	{
		max_prints = GetDvarInt( "zombie_history_debug" );

		if ( self.zombie_history.size != last_zombie_history_size )
		{
			last_zombie_history_size = self.zombie_history.size;
			prints = 0;

			for ( x = self.zombie_history.size; x > 0; x-- )
			{
				if ( IsDefined( self.zombie_history[ x ] ) && prints < max_prints )
				{
					thread print3d_at_pos( self.zombie_history[ x ], undefined, "update_zombie_history_" + prints, ( 0, 0, 64 + prints * 10 ) );
					prints++;
				}
			}
		}

		wait ( 0.05 );
	}
	#/
}

Then after, you'll want to toggle the DVAR "zombie_history_debug" to any number of history events you want to see. It'll print the most recent at the bottom, like the console.





How Can I Log My Own Events?
Stock scripts already log events for you, but if you want to log your own you'd want to do something like:

self zombie_history( "zombie_assure_node -> failed to find a good entrance point" );

Call it on a Zombie AI and the first and only parameter is a message (usually is the function name the log is in and some helpful description about what is happening).

cool thanks man !!!