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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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Holy shit, you got it working and working well to boot. Hell of a write up and a tricksy workaround with the th_pain bit, almost surprised you didn't find some evil way to make it rotate vertically as well as the usual horizontal rotation. 
Cool Turret 
Another impressive hack, well done. It's also inspired me to finish off an article I've been working on for a while. It's an ode to the oft mentioned function while hacking: SUB_CalcMoveDone

If you want to know the best way to make a gib fountain, or what the "Duke of York" hack is all about, come have a read... 
I am just getting started "cutting and pasting" QuakeC. I followed your recently revised tutorial on monster spawning here:

I'd like to add a small random delay automatically to each teleporting monster as you can do in Quoth. Reason is I am using custents multiple triggers to trigger these delays spawns. As in Quoth it would be nice to have a little variation on the timing if the monsters all share a targetname.

Would this be as simple as modifying this:

//override the random delay some go functions apply
self.nextthink = time + 0.1;
spawn_tfog (self.origin);
spawn_tdeath(self.origin, self);

to this:

//override the random delay some go functions apply
self.nextthink = self.nextthink + random()*0.5;
spawn_tfog (self.origin);
spawn_tdeath(self.origin, self);
I was finally able to try this last night. Does do it. Any hints would be appreciated. 
Typo Above 
Doesn't do it. 
No Expert Here But... 
Should it be

self.nextthink = time + random()*0.5 
I tried that as well. It's going to be a bit more complex I think. 
Don't Have The Source Files On This Computer 
What values does the random function give? Anything between 0 and 1? Does the function require parameters? Like random(5) giving values between and 0 and 5? 
Just googled the answer myself. 
QuakeC Questions 
would be better discussed in the Coding Help thread. 
Apologies. I associate this thread with Preach and forgot it was more of a hacks thread. 
See my suggestion in Coding Help 
Very Interesting Stuff All This Is, But I Have A Question. 
First off I mostly play a form of teamfortress, regtf, custom, and megatf. I've noticed a lot of maps use trigger_hurts to simulate mine fields and things of similar sort. I wanted real exploasion, real particles, and I used the infomation here in this to do just that. It's targetable or touchable however you need it, but it only fires once. Nothing I have done will make it work again. Is there a way to reset an info_notnull? 
You probably tried the barrel_explode hack which indeed only works once. The only way I could imagine for this to work without custom code is using a W_FireRocket hack that shoots a rocket right into the ground. It can the used multiple times because you can set its ammo count to a very high value. Of course there'll be the rocket launch sound, but that's probably acceptable. Read above to see how it's done. 
I See, So It's Relying On The Ammo In Needs. 
"classname" "info_notnull"
"use" "GrenadeExplode"
"enemy" "1"
"group_no" "1001"
"health" "1"
"targetname" "proxi1"
"nextthink" "0"
"origin" "-264 -90 -352"

I'll try adding this to it and see if that helps.
"no_grenades_1" "200"

thanks btw. 
Well My Way Doesn't Quite Work. 
I could perhaps use the rocket like you said, however, I was hoping more to use effects from something not a trap already. Like triggering detpacks, or airstrikes. So far the only thing that keeps firing are monster attacks. Now consider these mods are stripped down, there are no monsters so none of their effects can be used. I'm starting to think I've gone about this wrong, and theres a better hack, but I only noticed this a week ago. I am at a huge loss right now, I'm quite ignorant. 
You should take a look at MechTech's progref.

There are several examples of what can be done within the commen progs.dat.
It's just a way of placing map entities with the right statements.
The first example is a trigger_multiple for lavaballs. I think it is easy to change it to GrenadeExplosion. 
Thanks Madfox 
I will surely look right now. 
Reading, Reading And More Reading, But 
The more I try things the better it gets, so far I have managed to find a repeating explosion. However, it always targets 0 0 0. Is there anyway I can simulate a players perspective to get a fixed point other than 0 0 0. That's what the code is calling for, someone to paint a target. 
Which funtion name are you using? W_FireGrenade? 
Not Quite 
I know you all recommend using standard quake progs, I am using the tf mod. It's not going to be updated. I used airstrike_target. I cannot use monster skills, well there are some but limited to zombie, grunt, dog, and fish. The rest of the code was stripped down to make room for the tf classes and abilities. I'm having to go through the qc and find function names. Trial and error for me at this point. 
Multiple Explosions 
The difficulty with a hack that lets an entity repeatedly explode is the explosion sprite. Typically the entity that explodes gets turned into the sprite, and the last command in the sprite animation sequence is deleting yourself.

I think you could pull something off though, using SUB_CalcMoveDone as a use function to cancel the removal on the sprite just before it happens. You'd need a second field like th_pain to be setting off the explosion I guess, not tried to build all this but it sound feasible... 
place a spawn and a scrag in the map

place the spawn somewhere else because we only want him for the precaches

give the scrag a touch key, set the value to tbaby_jump1

run up and bump into the scrag
there will be error messages, but shit is hilarious. 
Works Spookily Well 
Dang if only I werent at work 
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