When creating things in a 3D environment, you must think about the essential elements that compose your scene. In a room, you will need doors and windows, otherwise, that would be a cage. So let’s learn how to make windows in a 3D indoor space.
The first concern could be how to create a glass? Well if you don’t need look outside, you can use a plane. Remember: A plane is like a single flat face. So once you have it, scale it and set it on the wall.
Note: Use the Wireframe Mode and Top Orthographic View (press seven (7) on your keyboard to set it just in the middle of the hole.
Now let’s make a frame around the window:
When you have finished extruding, notice that the final part is separated from the starting piece. Don’t worry! You can fix it:
Note: Once you have done an operation, it’s unnecessary to remake all the processes again because Blender has a memory called Repeat Function. Instead, select the other vertices you want to merge and press Shift + R to access this new function.
You can add as many details as you want in your 3D indoor space, like stairs or different types of doors, knobs, or windows. Anyway, it's your world. The possibilities are endless!