how to make floor touch trap like...

[tyrzi]

I like if i can do floor touch trap like this

I Show there with doombuilder so you maybe can understand it better

so

First that middle of that circle is floor touch point

and if you touch it, trap is activated

like that, that circle raising automatically if you touch that floor touch point
and there is maybe raising some lava too.

 

[Kyasarin]

First, give the Sector (the one you step in to activate it) an effect of 80. Give it an unused tag.
Create a Control Sector outside the level and tag one of it's sides to said Sector, with action 300. Tag another (with action 403) side to the Sector you want to raise (in this case, it's the one you enter) and change the Control Sector's floor heights according to how high you want it to rise.
Linedef length determines how quickly or slowly the floor rises.