Now, it's great that we have a layout, but just a floor plan would get really boring really quickly in a first-person game. Luckily, we have a number of props that we can use to spice up the level a bit and add additional detail to our world. Perform the following steps:
Propsfolder, and select all of your models. Under the Model tab, check the Generate Colliders option, and click on Apply.
This will create collisions for all the objects that we want to use. We didn't choose to generate colliders for the modular pieces, because we will generate them from scratch for our rooms.