The "How do I..." Thread

[juizzysquirt]

How do I triangulate a camera again? I remember figuring this out previously, but I forgot how the math works. Funny part is I'm pretty sure I was the one who originally came up with it.

I've been messing with the following snippet:

SetActorPosition(2, x-cos(a)*xyr, y-sin(a)*xyr, z+512.0, 0);

I havent been able to figure out what exactly is going on with cos(a)*xyr and what exactly it's doing there. It's been so long since I've messed with this.

In case anyone is wondering where that snippet is from it's located in the article about the [wiki]Cleaned-up_third_person_camera[/wiki]

Does this help at all? [wiki]Cos[/wiki]

I'm referring to the example in that article. So basically :

Code: Select all

SetActorPosition(2, x + cos (angle + 0.5) * 80, y + sin (angle + 0.5) * 80, z + 80.0, 0);

That should keep the actor behind the player, not sure about the actual distance. It should be 80 units away and same amount in air, I guess?

[Apothem]

The end result I understand it's what the actual math behind the cos() and sin() that I'm having trouble with. I'm trying to understand the mathematical concept behind why that works the way it does. I need to adapt the code to something else, but I forgot how the actual math behind it works

You're on the right track with it. I just need to understand what exact formula is being used.

[Lioyd_Irving]

And I might mean that literally. I want to implement an "unarmed" weapon, but it seems the Deselect state won't end unless there's an actual sprite to lower. So I'm looking for a decent sprite of a hand. The thing is, I haven't seen any that isn't a combat stance, which I can't use because my thing is supposed to pass you off as a civilian to nearby guards.

[NeuralStunner]

The thing is, I haven't seen any that isn't a combat stance, which I can't use because my thing is supposed to pass you off as a civilian to nearby guards.

Have you considered a blank sprite? If you're not in combat ready stance, unlikely you're going to have your hands up like that. If you really need a visual cue, a slight bit of a knuckle would probably do.

[Lioyd_Irving]

I did try TNT1 and just tried with an original blank sprite, but it still won't do.

I thought about using no sprite, but taking it from the inventory altogether as "deselection", and giving it back right at the selection of every other weapon.

Edit: Aaaaand it didn't work. Guess I'm gonna use that knuckle.

Edit²: I'm an idiot. I'd just forgotten to put A_WeaponReady.

[Lioyd_Irving]

We might as well rename the thread after me. Anyway, I need to force autoswitch off at pickup and Weapon.SelectionOrder won't do the trick.

[FDARI]

The end result I understand it's what the actual math behind the cos() and sin() that I'm having trouble with. I'm trying to understand the mathematical concept behind why that works the way it does. I need to adapt the code to something else, but I forgot how the actual math behind it works

You're on the right track with it. I just need to understand what exact formula is being used.

Did anybody answer this?
I'm not an able teacher, but I understand cos and sin well enough to use them.

All points in a circle are them same distance from the centre (distance = radius).
A circle is a two-dimensional figure, so we'll be working with the "length" and "width" (x,y) coordinates. (Names and uses may vary.)
Given any one angle "A", COS(A) scales the "length" of the angle, and SIN(A) scales the width. Together, they give a point in the circle.
Multiplying both values by 2 gives the same point in a circle of radius 2.

You could also try wikipedia, but I have never understood their instructions. I'd sooner write a demonstration program than expect you to dig that.

[The_Funktasm]

Does anyone know how to export a model from blender to use in gzdoom?

Edit: Never mind, figured it out...

[FDARI]

Quick followup on trigonometry. Once I got the idea into my head I could not leave it be.
Basic trigonometry for ZDoom II: http://files.drdteam.org/index.php/file ... ssroom.pk3
Just go talk to the teacher.
Will it help anybody? I don't know.
Features ridiculously complex menu system.

EDIT: Fixed a minor glitch (scripts not loaded... eh.)
Note: I haven't bothered to do anything about the aspect ratio. Blackboard trigonometry will most likely be distorted.

[Ryan Cordell]

How do I get the Superlaser_trail model to work?

For some reason, using The_Funktasm's laser model on the Superlaser projectile itself works fine. However, it outright refuses to work on an actor which serves as the Superlaser's trail. I'm really not sure why. The model is defined correctly, the trail actor is defined to be as close to the projectile itself and yet, nothing.

EDIT: Apparently, said trail actor requires the Speed property and the MISSILE flag.

Now I'm trying to use A_SetUserVar in junction with A_SetScale to make it dynamically scale down in it's lifetime.

[Killar]

How do I use USDF dialogs in a mod?

[NeuralStunner]

How do I use USDF dialogs in a mod?

For actual creation of the dialogs, read the [wiki]USDF[/wiki] article. To make them work, you'll need [wiki=Actor_properties#ConversationID]ConversationID[/wiki]s.

[Killar]

How do I use USDF dialogs in a mod?

For actual creation of the dialogs, read the [wiki]USDF[/wiki] article. To make them work, you'll need [wiki=Actor_properties#ConversationID]ConversationID[/wiki]s.

Can you show me an example script, or actor definition? The wiki doesn't have example USDF scripts.

And here's my actor definition and dialog script:

---

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namespace = "Strife";

conversation
{
actor = 1000;

page
 {
name = "Mark";
dialog = "There's a mission waiting for you. Do you want to proceed? Remember, it's a good idea to check all the shops, research and upgrades before every mission.";
 choice
{
text = "Yes.";
nextpage = 2;
}
 choice
{
text = "No.";
nextpage = 3;
}
 }

page
{
name = "Mark";
dialog = "Loading briefing data now.";
}
page

{
name = "Mark";
dialog = "Come back when you are ready.";
}

}

Code: Select all

Actor Mark 8348
{
  Speed 1
  Health 100
  Radius 16
  Height 56
  Mass 100
  PainChance 255
  MONSTER
  +FRIENDLY
  +USESPECIAL
  Translation "112:127=192:207"
  ConversationID 1000

  States
  {
  Spawn:
    PLAY A -1
    Loop
  See:
    PLAY ABCD 4 
    Loop
  Missile:
    PLAY E 12 
    Goto Spawn
  Melee:
    PLAY F 6 BRIGHT
    Goto Missile
  Pain:
    PLAY G 4 
    PLAY G 4 A_Pain
    Goto Spawn
  Death:
    PLAY H 0 A_PlayerSkinCheck("AltSkinDeath")
  Death1:
    PLAY H 10
    PLAY I 10 A_PlayerScream
    PLAY J 10 A_NoBlocking
    PLAY KLM 10
    PLAY N -1
    Stop
  XDeath:
    PLAY O 0 A_PlayerSkinCheck("AltSkinXDeath")
  XDeath1:
    PLAY O 5
    PLAY P 5 A_XScream
    PLAY Q 5 A_NoBlocking
    PLAY RSTUV 5
    PLAY W -1
    Stop
  AltSkinDeath:
    PLAY H 6
    PLAY I 6 A_PlayerScream
    PLAY JK 6
    PLAY L 6 A_NoBlocking
    PLAY MNO 6
    PLAY P -1
    Stop
  AltSkinXDeath:
    PLAY Q 5 A_PlayerScream
    PLAY R 0 A_NoBlocking
    PLAY R 5 A_SkullPop
    PLAY STUVWX 5
    PLAY Y -1
    Stop
  }
}

[Apothem]

You could also try wikipedia, but I have never understood their instructions. I'd sooner write a demonstration program than expect you to dig that.

I tried wikipedia as well with no luck, HOWEVER, I did manage to find the solution to my problem (with a big thanks to a math dedicated forum). Link below.

http://www.mathisfunforum.com/viewtopic.php?id=14682

[NeuralStunner]

Can you show me an example script, or actor definition? The wiki doesn't have example USDF scripts.

I don't know of an example script, no. Sorry.