Adding ceiling to 3d room model

[leviz1]

I'm trying to build a virtual environment that will look relatively natural for an experiment and could use some help:

I have loaded a model of a room from 3d warehouse but need to add a ceiling for it to look normal
Is there a way to add a simple neutral color/ pattern ceiling at a specific height? the room I need it for is pretty big so the ceiling should be long/ with length by demand
couldn't find anything suitable on 3d warehouse.

Thank you in advanced

[Jeff]

You should be able to load it into SketchUp and make the modification there. There are many online tutorials for SketchUp modeling. The following is a tutorial related to the SketchUp to Vizard workflow:

https://sites.google.com/worldviz.com/sketchup-workflow/home