Create Real Fog (From Faces)
Use this button when you want a fog volume that is shaped by actual scene geometry instead of a free cube.
What you must prepare first
- Blender must be in Object Mode.
- You must have exactly two mesh objects selected.
- Each selected mesh must have exactly one selected quad face.
Selection order and direction
This button follows the same A → B logic as the light version. The first selected object defines the source side of the volume (A), and the second selected object defines the target side (B). In Blender, that second selected object is typically also the active object.
In practical terms, select the object that represents the source area first (for example a window), then select the object that represents the destination area second (for example the floor). This order determines the direction of the generated fog volume.
Lighting reminder
Real Fog is not emissive. Even when the volume is placed correctly from source to target, it still needs light in the scene to become clearly visible.
What happens when you click the button
The addon builds a prism between the two selected quad faces, creates a dedicated material in Real Fog mode, and makes the new volume the active object so you can edit it immediately.
Expected geometry behavior
If the two faces do not correspond cleanly, the generated prism can be adjusted slightly on the B side. This is not a bug. It is how the addon keeps the generated faces planar and avoids warped geometry that would degrade the final render.
What changes after creation
Fade Direction is hidden because it is locked by the A → B construction. Invert Fade remains available, so you can still reverse the internal fade after the object exists.