Doors are useful in games. Visually, it is more appealing to not have holes in the walls but doors for the players to pass through. Doors can be used to obscure the view and hide what's behind them for a surprise later. In extension, they can also be used to dynamically hide geometries and increase the performance. There is also a gameplay aspect where doors are used to open new areas to the player and give a sense of progression.
In this recipe, we will create a door that can be opened by pushing it, using a
This door consists of the following three elements: