July 02, 2015, 04:47:11 am
Hi kayak83
Welcome to Lumion and the forum.

Lumion combines all surfaces with the same material set in the 3d modelling application, such as SketchUp. This optimizes certain things for real-time. But also makes it easy to apply once across all surfaces of same material, and saves some of the headaches if every surface had to be assigned or re-assigned again in Lumion.
When the surface needs a different material, as in your model the deli case and windows, then you need to set a different material for each in SketchUp. Having done that and saved the file, you can then use one of the
Reload options (see LUMION 5: Quickstart Guide link below) to update the model.
As you will have noticed in using the
Material Editor, planes or surfaces are selected/picked on a material basis, so not as individual planes.
So if the design decisions about materials are done as part of the model, and surfaces set with their own materials, then that will flow naturally through to Lumion.
So to answer your question, no not doing anything wrong, it's just understanding (as above), how surfaces and materials relate in Lumion, and between Lumion and the model it works with.

Refer also:
1.
LUMION 5: Quickstart Guide2.
LUMION 5: Keyboard shortcuts3.
LUMION 5: Frequently asked questions4. and Video Tutorials (see link top of forum).
HTH.