Full Tutorial: sidefx.com/tutorials/sci-fi-door-generator/
In this lesson, you will learn how to create a functioning door asset that can be used to rapidly add doors to a level. Each of the doors will be consistent with the design aesthetic of the level, while allowing your designers to customize the shape, size and detailing on a door to door basis. One asset built this way can generate multiple doors in the Unity editor that are all game-ready with efficient poly counts, uvs, collision geometry and texture maps.
Before you build the asset, this video will show you the finished tool to give you an idea of what you are trying to accomplish. You will see the tool in action inside the Unity editor then take a quick tour of the node networks in the Houdini scene file.