This is a simple script that allows you to have text pop up in the top left hand corner, nothing to fancy. Just basic since this is my first script I have written ) I wanted to start with something easy. Please leave constructive criticism if it is required.

How to add -
1. Locate the 'YourMapName.gsc' in your map folder (CoDWaWRoot/mods/MapFolder/maps) and open it.
2. Scroll all the way to the bottom of the script and copy and paste the following code

//Easy Text Intro - By Andy Whelan
text_intro()
{
	trig = getent ( "text_intro", "targetname");
	trig waittill ("trigger");
	wait (10); //How long it takes to appear on the players screen, change if you want.
	iPrintLn ("Office Survival"); //Change the text inside of the "" to whatever you want to appear. 
	wait (5);
	iPrintLn ("Map by Andy Whelan"); //Again change the text inside of the "" to whatever you want to appear as the 2nd line. 
	wait (5);
	iPrintLn ("Don't look down"); 
}

If you want more text then copy and paste the following

wait (5);
iPrintLn ("");

and put it under the previous text line ( iPrintLn ("Don't look down"); )
3. Find maps\_zombiemode::main(); in the same file and place this code underneath it.
 

thread text_intro();

So it should look like

maps\_zombiemode::main();
thread text_intro();

4. Now the scripting is done, save and close the file.
5. Open up your map in Radiant and in the 2D view right click and select trigger then select the trigger radius.
6. Press 'N' and give it the following KVP   targetname     text_intro
7. Move the trigger to where the players spawn and now save and close radiant.
8. Compile you map and build the mod and then you are done 

Give feedback if you want, if you are having trouble just ask.
Give credit when needed please.

It works, however since World at War has its own intro HUD function(s) i don't see this really having a practical use.

Bit of advice: When getting entities or other types of data that you can't guarantee exist in the level, always wrap an if(!isdefined(<var/ent/player/ai>)) around it to prevent code execution. If testing your map with developer and developer script, you should put something like this in the if condition statement:

if(!isdefined(ent))
		assertmsg("Entity is not defined");

This will cause an error while in developer saying that the entity doesn't exist and ending execution in the process. Otherwise if your not running in developer(which you should), you should do:

if(!isdefined(ent))
	{
		iprintln("Entity is not defined");
		return;
	}

and this will just print the message in the top left corner and end the function.

Ive always wondered this so ill ask

im programming such as this, what does "assert" do/mean?

Ive literally never had to use it, does it write that to console log on failure or something?

Ive always wondered this so ill ask

im programming such as this, what does "assert" do/mean?

Ive literally never had to use it, does it write that to console log on failure or something?

Yes, it forces a developer error like a script compiler error that you'd see with a poorly made script when launching with developer with the string arg in assertmsg() being the error. Extremely useful for debugging when used with developer and developer_script.

sounds it, wondered why treyarch used it. Ill use it in future

This seems like a boring method... much rather create some fancy "animated" text then just a simple IPrintLn.

Also asserts are messages spammed onto to player's screens if it ever reaches that point. Only occurs in developer mode iirc.

Assert(value -> correct);
AssertEx(value -> correct, "Message if false");
AssertMsg("Message");