March 15, 2011, 11:53:52 pm
My advice is to divide your building in different layers ( in the 3d app that you're using I mean ) and from there apply the materials you want, best way to assign the same material to the objects that share the same materials.
When you finish to apply all the materials you export, one by one, all the layers you needs...for example in my two floors apartmente I create a layer for each room, so I have bedroom living room, bathroom, and so on.
So, in Lumion, you import your "kitchen" and start apply the materials, then, when you finish with the kitchen, you import "bedroom", put it away from the "kitchen" and apply the materials again, until you do all the layers.
When you're done with the materials you align all the meshes that you import together ( since, in my case, the 0 point is the origin, so each imported mesh has the same origin ) and you check the results.
If you want to modify lately the materials you just select the mesh that you want to modify and from there change the material property.
So far this is one of the best and quick solution I've found in order to setup materials properly and test everything all together after applying the materials.
I suggest you try this method, otherwise you can use the layers inside Lumion, but I prefer exporting layers from my 3d app and then do all the operations described above