The wall model is only a large plane at the back of our scene. We can make it a lot more interesting by adding a door. For that, we will cut the model using a tool in Blender called Loop Cut. The Ctrl + R keys are a shortcut for loop cuts, but they only work in Edit Mode.
There is also a dedicated button on the Toolbar, as follows:
Figure 3.7: Loop Cut button
When you trigger the loop cut, you will have to use your mouse cursor to choose an edge to cut. The cut will be perpendicular to the edge. With a click, you can set the direction of the cut, and Blender will ask you for the location of the cut.
Once you choose a direction, ...
