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I'm using Shapes3D with Processing 2. I downloaded a starmap and used the library to project onto an ellipsoid as a texture. If I zoom into the ellipsoid, I get a planetarium view of the stars. Now, that's so cool but what I want to do is add some arcs. I successfully connected my 9 DOF IMU and can rotate the view in pitch,roll,yaw. I basically have a sextant and I want to point at a star and get the Right Ascension and Declination. I tilted the ellipsoid to my current latitude(actually, 90-lat) and when I point at Polaris, the IMU pitch reads my latitude within .05 of a degree.
The library question is how can I draw arcs onto the ellipsoid? Do I have to "extend" or "Override" one or more of the shapes3D classes? My java skills are sketchy, but determined and growing.