"How do I ZScript?"

[Graf Zahl]

A dummy object is just the same as your thinker in terms of cost. If you need it repeatedly, store it in a local variable. The expensive action is to retrieve the global storage thinker, not to use it.

[Major Cooke]

What's with all the const function stuff and what is its purpose?

[Matt]

I'm sick of typing out this sort of thing constantly:

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		vel+=(
			cos(angle)*cos(pitch),
			sin(angle)*cos(pitch),
			-sin(pitch)
		)*10;

I'm seeing in the actor function list a bunch of things like "Vec3Angle". Can those be used instead?

[ZZYZX]

I think there are static methods in vector3... Its just that these are not defined anywhere in the ZScript files and are instead directly set on the C++ side.
Anyway I'd write a function here and forget about the overhead. Like vector3 GetRotatedUnitVector(double angle, double pitch, double roll).

There are methods in actor that can give you only angle (Vec3Angle), but not angle+pitch and certainly not roll.

[Major Cooke]

Use A_ChangeVelocity with the CVF_RELATIVE flag.

[Ed the Bat]

Just a quick question this time:

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class Key : Inventory
{
	Default
	{
		+DONTGIB;		// Don't disappear due to a crusher
		Inventory.InterHubAmount 0;
		Inventory.PickupSound "misc/k_pkup";
	}
	
	override bool HandlePickup (Inventory item)
	{
		// In single player, you can pick up an infinite number of keys
		// even though you can only hold one of each.
		if (multiplayer)
		{
			return Super.HandlePickup (item);
		}
		if (GetClass() == item.GetClass())
		{
			item.bPickupGood = true;
			return true;
		}
		return false;
	}

	override bool ShouldStay ()
	{
		return !!multiplayer;
	}
}

I notice in gzdoom.pk3, the definition for Key features a flag with a semicolon after it. I know it's not required, but does this mean it's optional? Does it hold any significance?

[Major Cooke]

It holds no significance with flags and are completely optional.

[Ed the Bat]

Alright, just checking. Wanna make sure I keep all my syntax proper and correct.

[Nash]

Probably a typo since everything else doesn't.

I'd still be careful because knowing ZDoom's history of 'IT USED TO WORK WTF NOW ITDOESN'T"

[Major Cooke]

No, that's a feature. People requested if it could be done for consistency and Graf obliged.

[Major Cooke]

Graf: How does the versioning system work? What needs to be considered when using it? What will be enabled/disabled when (not) using it?

[ZZYZX]

1.

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version "<latest gzdoom version goes here>"

at the top of your zscript.txt
2. Nothing
3. Only GZDoom 2.3 ZScript features with unspecified version

P.S. It's NOT DONE. It's literally not done, the latest master branch in GZDoom's repo is in an intermediate state, half there. Don't try to use versions just yet.

[Major Cooke]

I have no intention of doing it right now anyway. Considering how broken things are at the moment, I'm not updating my GZDoom to the latest git right now until after it's safer.

But the whole determination of the syntax for inserting play and ui keywords will definitely need clarification so I know what and when to use them with 2.4 features.

[Graf Zahl]

Graf: How does the versioning system work? What needs to be considered when using it? What will be enabled/disabled when (not) using it?

I can't tell you how something works that isn't even done yet.

[kodi]

How do apply a player property to a pointer?