I have opened a 3d model file into autdesk design review. The building in the file is all white in revit, regardless of the visual style option I have selected(shaded, realistic, consistent colors, etc.). When I open the file in Design Review, the white is now a very dull grey/brown color. In fact the entire file is dull and darker. The elements are all there but the colors are bad. I need help as to why. I have changed materials and no matter what it is, the materials aren't displaying similarly to my revit file.