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Earth orbits and satellite coverage display in 3D on your laptop.
SaVi - simulate Starlink, Iridium, Globalstar, O3b, GPS, Galileo and other satellite constellations, modify them, or design your own. Requires Tcl/Tk and Unix libraries; 3D viewing option requires Geomview running on X Window.
...http://sourceforge.net/projects/rayshade/
http://sourceforge.net/projects/rayshade-math/
http://sourceforge.net/projects/utahrastertoolkit/
NOTE: Rayshade is unmaintained so no longer competitive to povray. And neither are competitive to RADIANCE. But see homepage or examples; Rayshade has good sides: great documentation and easier radiance style file format: but no GUI for design.