How to make a door what opens when you kill a demon.

Hello fellow mapmakers! As you read in the title i'm going to show you how to make a door what opens when you kill a demon on doom builder.

First:Press T (Default) to open things mode, right click to create a thing, select the monster that you want to open the door after being killed.

Second:Make a door, Check the door sector tag.

Third:Assign the monster the same tag of the door, and the 11 Door Open tag. On sector tag set it to the door's tag.

Fourth: Test the map.

Fifth:Enjoy¡ 

You should specify that this only works in UDMF map format (and maybe Boom? Hexen? I don't know).

Hexen format needs an ACS loop script that keeps track of things with a given tag (ThingCount();) and if count == 0, then trigger a door or whatever. See the example here:

https://zdoom.org/wiki/ThingCount

Boom doesn't have tags for monsters. You can use Dehacked to add the BossDie code pointer to a monster, which would then work in Boom, limit-removing, or vanilla.

Otherwise, for Boom, you would have to manufacture a situation where you put a monster on a scrolling floor and blocked them from crossing a generalized walkover linedef until they were killed.

...or get rid of boom and use scripting in ACS...

On 10/30/2022 at 6:08 PM, CatWithAComputer said:

Hello fellow mapmakers! As you read in the title i'm going to show you how to make a door what opens when you kill a demon on doom builder.

 

First:Press T (Default) to open things mode, right click to create a thing, select the monster that you want to open the door after being killed.

Second:Make a door, Check the door sector tag.

Third:Assign the monster the same tag of the door, and the 11 Door Open tag. On sector tag set it to the door's tag.

Fourth: Test the map.

Fifth:Enjoy¡ 

This only works in UDMF. Hexen, Strife and Boom/Doom formats all require different ways to implement it. 

In udmf, you don't need to tag the monster. Give it the action and the door will open when it dies.