This tutorial covers the export process from SketchUp to the Collada format. The exported model does not support all the features of the SketchUp model. What gets saved is the geometry, colors, textures, and model hierarchy. It does not include features such as lighting, shadows, layers, scenes, and text. Vizard, however, with it's built in libraries has the ability to replicate many of the features that don't carry over. Look
here for a complete description of the export options and what's included in the Collada model.