Assign Brick Material to Houses
The brick material has a non-zero emissivity, so it is suitable for a radiation analysis without further modification.
Hide the Air part.

Select the two houses

Open the Materials quick edit dialog in ONE of the following ways:
- Click Edit from the toolbar:

- Click Edit from the Materials context panel:

On the Material quick edit dialog, Type = Solid.
Material DB Name = Default.
Name = Brick

Click Apply.
