EntityIO

Anyone that has gotten quite deep into mapping in Hammer probably knows about the Entity IO stuff. It's a system that lets you hook up outputs on entites to inputs on other entities.

For example, you can trigger an output on a button called "OnPressed" to an input in a light called "Toggle", and the button will turn the light on and off.

This month I re-implemented it in C#. To create an input on your entity you just mark it with an InputAttribute.

And to fire outputs you just call FireOutput

There's some finessing left to do here, but it works exactly how you'd expect.