This screenshots are raytraced in an external program.

If you take a screenshot with f8 you will get a file called raytrace/screenshot.pov

This file you can raytrace with the free raytracer PovRay http://www.povray.org

The screenshot.pov file only tells the raytracer the location of joints, bodyparts and blood. Colors, lights, materials etc can be specified afterwards.

Here is another shot btw

http://www.toribash.com/fov180.jpg