In the first step, let's create a light probe group.
Now I will duplicate my probe to fit my doorway. To know how I duplicate this goes back to my previous project I have an article about that.
Now I will select a few floors on the doorway to avoid unity to baked light forever. Then I will generate light.
This is called cheating, Light group is so special it gives us bounce light and makes the auto-generate process of light calculation more quickly by choosing only one part to collect light.
Also, it provides volumetric light without using real light calculation or avoids using post-processing which is also expensive.
See you in the next article.