One thing I find problematic in Sketchup is the deadly 'long skinny triangles' that get created prolifically on planes where smoothly curved edges are employed. These babies are a nightmare when using displacement mapping in a third party renderer. Is there any program that you know of that can be exported to which will allow optimizing of the mesh parameters, maybe even converting to quads where possible, all the while maintaining the UV parameters that were exported out with Sketchup? MOI has an excellent mesh modifier built-in, but no UV capabilities, or compatible file formats with SketchUp exports.