Using the Add-on
How it Works
Scene Fog Setup sizes the fog automatically from your current selection and keeps each created volume independent.
Selection is required
You must select one or more objects before creating the fog.
How the fog volume is built
The add-on calculates the overall bounds of the selection and creates a fog box slightly larger than that selection.
A positive offset of 0.01 is added on X, Y, and Z to avoid overlaps with the source objects.
The created volume is placed in a dedicated collection named Scene Fog Setup.
Each new volume is created with its own unique material, fully independent from the other fog volumes.