In this sketchup v-ray video tutorial, you will learn how to use v-ray proxies in skethup models to produce superior quality renderings with high polygon models.
Rendering in sketchup becomes complicated since sketchup can’t deal with high polygon models. So, if there are more faces and geometries in the model, the modeling process become slower since sketchup does not handle all the geometries efficiently.
With high polygon, high detail model inside your sketchup model, it becomes difficult to produce realistic rendering. But v-ray contains a tool known as proxies that facilitates to export the objects out of your model and substitute them with a low polygon preview model.
When rendering starts, v-ray will reference those files called meshes externally devoid of showing them in your model.
To learn the detail process, go through the following video tutorial.
Video Source The Rendering Essentials