Increasing player jump height for one map?

[Jaxxoon R]

Basically, I've been trying to make the player have 2-3 times the normal jump height for only a single map. I can mess with the gravity values in ZMAPINFO, but the results are undesirable since it also fiddles with everything else.
I was just wondering if there was a better way to do this, perhaps through inventory items and custom player classes? Or maybe by temporarily lowering the player actor's mass instead?

I'm not quite sure what the most effective way of doing this would be...

[Shadow Hog]

ACS.

Modify APROP_JumpZ. Personally I'd set it to be a multiplier of the actor's original, just in case varying jump heights are a factor in whatever mod's being made here, but you can also set it to a constant jump height if you really want to.

That said, AFAIK this change is permanent, so you'd need something to change it back later.

[Jaxxoon R]

Argh... All I'm able to do is make the player not jump whatsoever. And yes, multiple classes with differing jump heights are planned.

script "JumpZ-Multiplier" ENTER
{
    Thing_ChangeTID(0,1337);
    GetActorProperty(1337, Jumpz);
    SetActorProperty(1337, APROP_JumpZ, jumpz*2);
}

All I've been trying to do is multiply the jump heights by two. LOL, I always knew my math skills were shit, but apparently my ACS skills are as well.

[Krispy]

I think the jump thing has to be a huge number to have any effect.

[Blue Shadow]

This should work:

script "JumpZ-Multiplier" ENTER
{
    Thing_ChangeTID(0,1337);
    int jumpz = GetActorProperty(1337, APROP_Jumpz);
    SetActorProperty(1337, APROP_JumpZ, jumpz*2);
}

I only did changes to the second line (see the parts in bold).

[Krispy]

I may be wrong, but I don't think that multiplying the "jump factor" by 2 will make the player jump twice as high. There's some crazy logarithmic equation involved.

[Blue Shadow]

I think you're right. According to the wiki, the player's jump height in normal gravity is calculated like this: jumpz^2/2. With the default jumpz value of 8, the jump height is 32. If you double the jumpz value, the jump height would be 128 (i.e., 4 times the normal), not 64.

Unfortunately, I'm terrible at math, so I can't give a formula for that. But with some calculations, I figured that the factor you want to multiply by is 1.4145 (or close enough). If you go with that, the second line need to be edited into the following:

int jumpz = FixedMul(GetActorProperty(1337, APROP_Jumpz), 1.4145);

[Jaxxoon R]

And then I couldn't reset it.
Oh no, if he goes back to the HUB...
Look, Spot, look. Look at Doomguy fly!