Quick Modding/Hacking Answers Thread

Also (sorry if wrong forum to post...) what's the highest amount of health you can get before the Sacred Lands? Without hacking that is.

 

I believe it is 55. Am i right? It's somewhere in the 50's. Then you get one obviously at the beginning of hell.

 

How hard would it be to make an ASM hack where there's an entity that would trigger an event if touched by any entity with a certain flag?
I can think of SOOO much awesome stuff to do with that.

 

How hard would it be to make an ASM hack where there's an entity that would trigger an event if touched by any entity with a certain flag?
I can think of SOOO much awesome stuff to do with that.

Impossible. Entities can not run collision tests with other entities.

EDIT: But if it were I wouldn't think it would be too hard.

 

They can't? Then how can the falling spikes kill zombie dragons?

 

They can't? Then how can the falling spikes kill zombie dragons?

There's a bullet attached to the end of the spike that kills the dragon. It's a special bullet made especialy for that.

 

Aww, darn. And I suppose there's no way to make a copy of that bullet that, instead of doing damage, runs an event?

And then making an entity with that bullet attached to it?

 

Aww, darn. And I suppose there's no way to make a copy of that bullet that, instead of doing damage, runs an event?

And then making an entity with that bullet attached to it?

No it is. Make the bullets X and Y velocity the same as the entitie and only have it run an event when it collides with a particular entity. That's my guess anyway.

 

"Entity" and "Bullet" are misnomers, sorta. There are three basic classes of objects:

You can react with entities but not bullets
Bullets can react with entities but not you
Entities can react with bullets and you

But none of the classes can react with themselves.
Theoretically, you could make a complete copy of the critter in the "Bullet" class. The only difference between this "bullet" critter and a normal critter is what kind of things it can react with. The code works the same way, but the effects are different.

I'm not sure what you wish to do, but if you want a bullet-type entity, then the runevent hack is totally possible and should be easy.



Another possibility would be to layer two identical objects (one an entity and one a bullet) that would get the desired effect of entity/entity interaction, but might be a bit more work.

 

You can react with entities but not bullets
Bullets can react with entities but not you
Entities can react with bullets and you

It's like a collision based rock-paper-scissors.

Player beats (makes) bullet.
Bullet beats entity.
Entity beats player.

 

Ah, but if a bullet creates an entity that can react with you as well! That changes the game completely!

 

You can react with entities but not bullets
Bullets can react with entities but not you
Entities can react with bullets and you

But none of the classes can react with themselves.

You may be right about bullets not interacting with bullets and entities not interacting with entities, but how do you know the player can't interact with the player? I'm pretty sure YOU'VE never seen two players come into contact!

 

You may be right about bullets not interacting with bullets and entities not interacting with entities, but how do you know the player can't interact with the player? I'm pretty sure YOU'VE never seen two players come into contact!

Well there's the fact that there can only be one player object, and there only is one player object.

Colliding with yourself is no easy task.

 

Well there's the fact that there can only be one player object, and there only is one player object.

Colliding with yourself is no easy task.

Someone needs to make it happen. Where's Nox and Lace? Your too busy with working.

 

Thanks for all the ideas about the bullet-based collision test. I'm sure they would serve me well if I was any good at ASM.

 

How do you know the player can't interact with the player?

There isn't any code for collision between two characters. Also as the character vars are global and not local, it isn't even really an object type - I just included it in the last list so you could sorta see the general interactions.

Also me and Noxid are both in work for the summer also. I have two weeks off near the end of the summer, so hopefully I'll be able to get in some quality hacks in then.

Thanks for all the ideas about the bullet-based collision test. I'm sure they would serve me well if I was any good at ASM.

Welcome. This could actually be very easy or very hard depending on the entity/bullet. I can't remember of the [ebp+n] tables are the same for both, but that would make it easy/hard also.

 

Hmm... If you did recreate a critter in the "bullet" class, You could have a pet that fights for you! Just think of the possibilities...
Now I want a pet Balrog >

 

Well it wouldn't really fight for you unless you changed the AI. *coughCURLY*
I think it'd just damage your enemies on contact, while trying to attack you.

And, yeah, if anybody wants to make an entity with a bullet attached that runs an event on contact with a certain thing, go ahead. I mean, the possibilities are endless. Just offf the top of my head, you could make a boss fight where you have to drop the boss off a ledge... Or you could use it to rig up timers that run without events... hell, we could even make sneak mechanics this way. Like in the metal gear games. Or more like Trilby: The Art of Theft.

EDIT: On an unrelated note, I'm trying to give the fireball weapon a kickback, but I can't find the part of the machinegun code that's responsible for that. Anybody have any hints?

 

I'm trying to give the fireball weapon a kickback, but I can't find the part of the machinegun code that's responsible for that. Anybody have any hints?

Weapon codes are in two sections - the "Gun" code that controls the firing of the bullets, and the "Bullet" code which controls how the bullets move. Currently, you're looking in the bullet section of the code, and the kickback is in the gun part. I have recorded that the machine gun is at 0x41e3D0 and that the fireball gun is at 0x41e110. That should help.

Well it wouldn't really fight for you unless you changed the AI. *coughCURLY*
I think it'd just damage your enemies on contact, while trying to attack you.

Here's the problem with an attack enemy, as was always the problem with curly. She can only attack a limited set of enemies. This set is not defined by her code, but by the enemy's code. Whenever an enemy that she can hit runs, it does a few comparisons, and depending, uploads its x and y into curly's target x and y.

For the record, if you do want to make an attack pet, this is the code that all the hittable enemies have:

  push 64
push 50
call 0040F350
add esp,8
mov [004BBA2C],eax
mov eax,[ebp+0008]
mov ecx,[eax+0008]
mov [004BBA20],ecx
mov edx,[ebp+0008]
mov eax,[edx+000C]
mov [004BBA24],eax

And curly's targetx = [004BBA20], targety = [004BBA24]


It would actually only be a few steps to make an attack critter, but you would have to repeat one of them over and over and over.
1) Copy the critters code into an unused bullet or a bullet you aren't going to use.
2) Replace the player x and y ([49E654], [49E658]) with target x and y ([004BBA20], [004BBA24])
3) Make the Iamanenemy code into a function (DO NOT push ebp at the start of this, it NEEDS to be preserved)
4) Call to that function in the code of every enemy.

And done!

 

It is impossible and you will not be able to do it.

This is almost never truly the case.