You can also reverse the process and take a low-poly model and increase the detail. The tool allows you to select how much you want to reduce the poly count of a model to get it down to the size you need. One of the tools that alone is worth the $39 cost, is a poly-reducer which is a huge help when you import models from a NERB software package like Rhino or Maya. The demo video below will give you an idea of the process. You have a series of settings which allows to to adjust the pressure of the brush, either positive or negative, and after setting the width of the ‘brush’, you drag it over the area to create the sculpted surface. The site has nice tutorial videos as well as a nice gallery of others work using the plugin. Created by Dale Martens, who has produced numerous other free plugins including Subdivide & Smooth, has created a set of sculpting tools that work very much like the sculpting tools in Maya and are incredibly easy to learn and use. The first is a plugin called Artisanwhich is a great solution for creating organic shapes. I use both regularly and because they each have different attributes, I think their capabilities really complement each other when you are constructing complex shapes.
One of its biggest drawbacks is that it has a hard time modeling organic shapes with NURB attributes but luckily it doesnt have to stay that way any longer thanks to the Soap Skin & Bubble plugin. Now there are two different plugins that make not only terrain construction but organic and vehicle construction possible without having the urge to jump out the nearest window. Sketchup is a great tool for modeling all sorts of shapes and objects. As a poly-modeler it was always handicapped when it came to modeling compound curved surfaces and even with the built-in Sandbox tools, drawing terrain was never truly easy. Most people think of Sketchup as a program that just draws boxes.