Drag-and-drop installation of VMD.
Package installation of Raster3D.
Downloaded PDB file without compression from PDBLite.
Opened PDB file in VMD and fixed the display as usual (no axes, cartoon, increased thickness, increased resolution).
Chose File>Render, select Raster3D, render using the command "render -png -aa -size 768x768 output.png < %s"
Voila:
Obviously the quality isn't as high as the examples I did using Lightwave, but this software is all free.
