How to set pawns on fire ? (spontaneous self-combustion)

[Reize81]

I am working on a personal mod which adds a variety of guns with special abilities. One of them is a pistol which fires incendiary rounds that have a chance to set the pawn which got hit on fire. I made this part work.
White phosphorus is a substance which ignites when it dries and which was used in WWII phosphor bombs. To simulate this behavior I would like to add a chance for spontaneous self-combustion which is acquired when the pawn is hit by the bullet and which leads to self-combustion a day or so after the battle. I want to simulate bits of white phosphorous which cling to the pawns clothes and ignite when they dry, for example during surgery/treatment when the bullet is removed.
Basically I want to add a randomly applied timer for spontaneous combustion. I thought something like a hediff which is given like carcinoma or dementia during toxic buildup.

          <li Class="HediffGiver_Random">
            <hediff>Carcinoma</hediff>
            <mtbDays>438</mtbDays>
            <canAffectAnyLivePart>true</canAffectAnyLivePart>
          </li>

Then I would have to create a hediff which results in spontaneous combustion. Can I somehow make a hediff apply a damageDef like "Flame" ?
I could use <becomeVisible>false</becomeVisible> to hide the acquired hediff and <severityPerDay>1.0</severityPerDay> to reach a severity of 1.0 after one day and then the stage of severity 1.0 would have to apply the damageDef "Flame". Could this work?
I thought of rewriting the damageDef with a radius restricted to one tile and without any sound. If a mote is required, I could use a transparent one and I could set the damage to be really small. The desired result would be spontaneous combustion. Any ideas how this could work?
Another question about the <mtbDays> - is it correct to assume that smaller numbers represent a higher chance of acquiring the hediff?
Because I couldn't figure out a working way with the damageDef I thought maybe I could create a mental state which leads to spontaneous combustion. Like Fire Starting Spree but with the pawn itself as the only target. Unfortunately, I guess the behavior of the Fire Starting Spree isn't controlled by .xml code and requires more programming than I am able to do.
In Job_Misc.xml there is an Ignite JobDef - so maybe I could somehow make the pawn ignite itself? Any ideas?

[Mehni]

Oh RimWorld. Never change.

There's no path in XML which results in setting a pawn on fire. You'll need some C# to reach these new heights (or depths) of messed up.

The Fire Starting Spree is the closest alternative to it which can be done in XML alone. Same way dementia causes a confused wander, any hediff can trigger any mental state.

[Kirby23590]

I have been running around with a mod i found in the workshop called Ignite everything.

It's more like how the raiders when they are attacking your colony are able to set fire on your wooden or metal structures... I mostly use it easily burn unwanted corpses or items and creating burning pillars to collapse mountains...

Though the mod is only in the Steam Workshop...

[LWM]

If you end up making this happen, I volunteer for adding a Thought Hediff "We[/They] committed a war crime.  They burned alive.  It was horrifying."

As far as C# projects go, this one is probably fairly easy?

--LWM

[jonbrant]

I found this via google, trying to do the same thing.
I figured it out, figured I'd share for others wanting the same

It takes some C# as mentioned, but in your bullet class, override Impact

Something like this:

Code Select Expand

protected override void Impact(Thing hitThing) {
if (Def != null && hitThing != null && hitThing is Pawn hitPawn)
    {
       hitPawn.TryAttachFire(1);
}
}


Check out Jecrell's Plague Gun tutorial if you don't know how to get this far, this is his code