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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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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. 
Objects That Selectivly Clip 
We're going to learn a new field we can add to almost any entity to change how it blocks other entities in the game. And that field is

owner n

Where n is the number of the entity that you want to "own" this entity. What does this mean? Well, it's easiest to understand by example. When an monster/player fires a projectile, the owner field of the projectile is set to the firing entity. This means that the two object will no longer clip or touch, they ignore each other for all collision purposes. The purpose is so that your own rockets don't explode on you as soon as you fire. Side effects include that you can't use a vore's own voreballs against it(directly).

So, what can we do with this? Well, you can set it on almost anything(doors being the big exception that already have owner specified in their own code). If you set, say, a monster's owner to 1, then it'll be noclip to the player. Kinda stupid, but cute, especially if you do it to a knight as it leaves them incapable of attacking you. You can't hit them with hitscan weapons, but you can get them with nails. This is because a traceline is in some ways a collision between yourself and the target entity.

So that's neat but not all that useful. A better use would be to have monsterclip that only clips selected monsters, like I suggested in mapping help. But surely you can only set the monsterclip to have one entity as it's owner? Yes, but that's the wrong way round to do it. What you do is make it so that all of the monsters you don't want to clip against it have the monster's owner set to the monsterclip. It's a symmetric relationship, so now all those monsters will disregard that one entity. Of course, they'll still hit all the other monsterclips in the map equally. You'll have to place them so that all the monsterclip they are likely to encounter that you want them to ignore is grouped as one entity.

The owner field might suggest that there's some kind of hierarchy going on here, but it's not the case. If the ogre has the player as an owner, and it's grenades have the ogre as their owner, the grenades still clip against the player. So you're basically limited to one link per object, it can be noclip to one entity of it's choice, and as many entities as you like can be noclip to it. The trick is to use the limited resource as creatively as possible.

What else could you do with this? Well, probably some good(evil) traps, shame this wasn't about for the speedmap pack last week. You could add HL2 style combine force fields that the player can't move through but the monsters can. I'm sure other people can think of things I can't. Maybe you could do something really clever for a coop only map, where player 1 and player 2 (entity 1 and entity 2 on the map) aren't treated symmetrically? It'd be cool to hear people's ideas. 
Sounds Awesome 
Preacher, you are the don of hacks. That one sounds particularly prime though, and it will get used. 
Levitating Enemies 
how about a shalrath (or shambler?) stood on an invisible func_train that only it can touch - either flying around a room and landing now and again to use its normal walking movement or else with a series of func trains causing it to jump around like in nehahra or the end of azure agony. 
 
MONSTER_FISH FRAG COUNT FIX !!! (sort Of) 
Here's something I just came up with.

Don't you hate not getting 100% kills due to the infamous monster_fish error? Well this doesn't stop the fish being counted twice, but you can manually increase the killed monsters count. Create an entity with these properties:

classname info_notnull
use boss_death10

Trigger it and the killed monster count will magically go up by one. BTW this method also kills the info_notnull, so you'll need one for every fish in your level. I suggest making each fish target one so they automatically call it on death. 
Fish Frag Count Fix 
Awesome hack Omus. I've always waited for something like this, and it works like a charm. 
Nice Find 
though on the other hand, it will screw up the monster count if playing with a fixed progs.dat 
A Very Basic Trick 
It's very likely that most of you already know that...

You can manually set the skin field for any regular Quake monster. This, combined with the armorvalue/armortype and super_damage_finished tricks can lead to some new mini bosses (like a super shambler, for instance). 
How? 
 
It's Very Simple, Actually 
Assuming you have a soldier.mdl with 2 skins (0 is regular grunt and 1 is your boss grunt):
{
"classname" "monster_army"
"armorvalue" "1000"
"armortype" "1"
"skin" "1"
"super_damage_finished" "9999"
}
His shotgun will deliver 4x the normal damage, but without the quad damage sound. And this sucker can take more than 1000 hit points.

The idea can be extended to any regular monster. 
Useful, But... 
If you have new skins you to include external files for the custom model right? In that case you might as well create a custom progs and run it as a mod. 
Not Necessarily 
A lot of modern engines support replacement model textures, and these can be used to add skins to a model that doesn't have them. 
But... 
can you replace skins that don't exist in the original mdl? 
Odd Occurance, I Noticed 
some months ago I was dicking around with Air Quake source and Dark Places with the intention of making some high(er) poly md3 models for it. I added a func_model type entity to the Air Quake source, designed a bouy type model and texture to test it with, and I added it to a map.

The md3 model showed up, but the texture didn't. I tried the various recommendations in the vast DP literature, and none of them worked to bring the skin in.

So I then converted the model to a Quake mdl, and indexed the colors of the skin texture to the Quake pallette. It showed up in game perfectly, not the mdl model, but the md3 and the md3 skin! So, apparently you need to have an mdl version for DP to recognize an external
skin. 
Metl 
I'm not sure, but I think you can from QC request skins/frames from ext texes that don't exist in the 8-bit mdl/spr.

Of course, it won't work so well then if you disable ext texes or don't support them. 
 
I see about the engines allowing external skins, and metlslime, I imagine you would use some sort of naming convention (eg: wizard_skin00.tga, wizard_skin01.tga) to support multiple additional skins in these engines.
Still, you have to include these new files somehow. I have always imagined these map hacks were useful mainly for maps that you don't want to bother zipping up properly or include a readme (speedmaps) or maps you want to run on vanilla Quake with no extra assets.

HeadThump - I know that with md2 models and some engines, you have to preserve the original paths of a model (where to look for the skin is hard-coded in the model). So if Quake 2 installs a model at: models/monsters/gladiator/tris.md2 (model) models/monsters/gladiator/gladiator.pcx (skin)

... you have to rename the files (the skin at least) and preserve these paths under a Q1 mod directory. The same may be true of Q3. 
Oh Yeah.. 
.. sounds like when you converted your md3 to mdl, it was able to find the skin (treating it as an external skin) because mdl models aren't as fussy about paths. 
Thanks Omus 
It's been a while since I visited my little project, but I think I'll see if that possibilaty is the case.

I checked the paths at the time to see if they matched up, but I may have only done so relative to the mod path and not the models internal structure, thus missing a crucial subdirectory. 
I Guess... 
the thing I'm worried about is that "replacing a texture that exists in the mdl" might be a feature of a number of engines, but it seems completely up to chance whether each implementation happens to work even when the texture isn't in the mdl file.

So you could try it, and it could work in some engines, but who knows which ones. 
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