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Teaching Old Progs.dat New Tricks.
You know about the info_notnull explosion hack. You know about making monsters drop weapons or alternate ammo using the .weapon and .ammo_whatever hacks. You know about making items float in the air by spawning them on a temporary platform. Let's have a thread where we talk about new ways to use existing behavior and get novel gameplay. If you're a "retired" mapper, this is a great time to do some armchair level design and suggest ideas you'll never have a chance to use yourself.
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Metlslime, Maybe... 
...I can open a .qc file, fiddle with it and recompile in less time than it takes me to build brushwork. My editor compile GUI can then re-run the map in one click with -onlyents selected to run the map with the new progs.dat in about three seconds. So, apart from the fact that I'm not too good with QC, I would find it easier.

My map will have to have my progs.dat to play as it has a mixture of monsters, so again, it is easier for me.

But I am not a 'wheel inventor' so the notnull thing suits me fine.

Having no professional interests in gaming, programming, IT, web-design etc, all of this mapping lark is just a bit of fun that takes an hour or so of my time every other day when I'm at home. And I enjoy poking around in Quake's inards even if I get lost every now and then:-) 
Killable Cthon By FrikaC 
FrikaC posted a killable Chthon on I3D:

http://forums.inside3d.com/viewtopic.php?t=475 
Invisible Monster Only Barrier 
Ok, this DOES work. He's how to make an invisible barrier that stops monsters but not players. This only works for monsters that don't swim or fly, and if the monster jumps or is pushed, they may pass the barrier.

First build a 32unit high step where you want the barrier to be. Apply a regular solid texture to the brushes. Now make a clone of this brush and position it above the existing brush. Make it 64 units high - it can actually be as high as you like, but lets use 64 units for now. Apply the clip texture to this. Select both brushes and make them into a func_wall entity. Now move the whole thing down into the floor slightly so that the solid brushes are 16 units below the floor (if this doesn't work, try 8).

Compile the map and run it in Quake... hey presto! The monsters should be stuck behind the barrier. Hopefully, you should be able to walk through the barrier without problems.

Turns out I used this weird trick in apsp1 after all. It was reused twice in dm3rmx when I rediscovered how it was done, though I killed the barriers in that to allow the monsters to pass after a certain time. 
File 
Here is an example map of stupid test things which happens to also contain the trick I mentioned in the above post: http://than.leveldesign.org/files/invisBarrier.7z

Ignore all the stupid shit I put in there, and just watch how the enforcer won't come out of his little box. Try the same thing with a fiend... you'll be in for a shock. 
Than! 
You are simply a one-man repository of l33tness. This'll come in big use with my base map =D 
Monster Barriers... 
A trick I use is even simpler -- players can cross any gap in the floor that is 32 units or less across, becuase they have a 32x32 bounding box and use hull1 to do their collision.

Monsters, on the other hand, use hull1 or hull2 for collision, BUT they use hull0 to do their pathfinding. Since there's a gap in hull0, they think they can't cross it. So just like cattle guards at the entrances to pastures, you can simply put grates or other gaps where you want the monsters to be blocked.

Gratuitous cattle guard picture: http://www.3rf.org/album/ComancheSprings/slides/cattle%20guard.jpg

And an example in antediluvian: http://www.celephais.net/shite/ant2.jpg 
Nice Metl 
That's pretty nifty. They will come at you one the floor is "filled" like with a func_door, right? 
Killable Chthon With Map Ents 
http://forums.inside3d.com/viewtopic.php?t=475

FrikaC explains how to make a Chthon that can be killed by the players weapons rather than electrodes, without doing any qc coding or using another progs.dat 
Cool. 
very well written, too. Helped me understand certain aspects of the coding process more intimately (though we're still 'just friends' at this point).
But since I can't test it, I'd like to clarify one thing... he won't pop out and start going? almost immediately after starting the map he'll begin tossing his loud fireballs around? or am I confused? 
Also... 
is there a way to make a monster invulnerable until a certain point, at which he'll become vulnerable to weapons/lighting/smooshing? 
Temporarily Invincible Monsters 
this is possible. simply add a "invincible_finished" "#" field.
the awkward thing is that the # seconds start counting down when the map starts, so events involving such monsters have to be carefully planned. 
Hay Guys 
i hear that FrikaC has a way to make a killable Chton without quake-c? or was it marcus sklar. . . 
No No... 
you're thinking of that level from 1997, called "THEFLY" or something... I think it was by this guy Marcus Klar... 
Huh. 
no way to trigger it huh? that takes alot of the fun out of it... 
 
I know this is probably getting annoying, but how do you get monsters to drop weapons/ammo? when making a floating weapon, do you simply place it on a func_wall and then kill it upon starting the map? Any other "widely known" hacks? 
Drew: 
as far as i know, you trigger this cthon the normal way. I'd have to re-read the tutorial to be sure, though.

And yes, you kill the func_wall immediately after map load, using a trigger on the start point or something. At least that's the traditional way to do it. I wonder if this would work instead:

"classname" "func_wall"
"nextthink" "0.1"
"think" "sub_remove"


or would that not work because func_walls already have a think function? 
Metlslime 
A func_wall has no think function, so that would almost work as it stands. The problem is that the items will not have been dropped to the floor by 0.1 seconds in, so you'd remove the func_wall too soon. Setting nextthink to 0.5 would be safe(items drop at 0.2 seconds in), and probably won't be seen by the player anyway. 
Preach: 
Cool, so that would work.

I much prefer a clean hack to a messy hack. 
Sound... 
...hiya, I'm at the stage where the only thing left to do in this map before release is to enable a switchable ambient sound (ambient_drone). Is this doable via an info_notnull hack? It only needs to go from 'on' to 'off' once. I can't really afford to use brush entities as I'm a bee's thingy from the markedgesurfaces vanilla limit.

Thanks in advance. 
Not So Loud 
Yeah, it's fairly doable. You won't get the same sound attenuation as with a normal ambient sound, it'll just be like a door or platform, but other than that it works well. These fields on an info_notnull:

noise1 ambience/drone6.wav
noise3 misc/null.wav
think plat_hit_bottom
nextthink 2
targetname noisebegone
use fd_secret_done


plat_hit_bottom and fd_secret_done are functions that play noise1 and noise3 respectively and not a lot else. The usual notes about making sure something precaches these sounds apply - ambience/drone6.wav is precached by an ambient_drone and misc/null.wav is precached by a platform or door with sounds set to 0.

If you don't have a door like that already and can't include one because you're close to the limits, then you can terminate the looping sound with any other non looping sound. So if this represents the power going out, you might want to have an explosion to punctuate it. enforcer/enfstop.wav and one of the lightning gun sounds would also probably work nicely here. Otherwise just try and find a short, quiet sound like a ricochet so it's not noticable. 
Many Thanks Preach... 
...you are the bomb. Now, are we going to progress that Mechanised Enforcer Weapons Platform any further? Asaki is finishing up the code, I just need to know if you are going to make the wish list of skin and model mods. 
MEWP! 
err 
Found By Accident 
while searching for a way to let Shallrat breach some vorebabes I thought it might be good to look for the multigrenades qc
They have the same second subroutine I need.

I saw the earthquake.qc and wondered if it wasn't possible to fit it in Quake1 without the DOE pak.
And to my surprise it worked.
There may be a strange target t2 in the map but for I can see it works.

http://members.home.nl/gimli/Q1EarthQuak.htm 
Madfox: 
nice work, but this thread is about NOT changing qc code, but instead using the bsp file to create ususual features. 
Alright 
out of toppic, sorry my enthousiasm.
I'll try to relate to the general abuse.

Maybe better then creating a new toppic.
Sometimes it harder to find the wrong toppic with a right idea then,

nevermind. 
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