I need an illustration of a translucent ellipsoid so that I can also see a vector form the origin to an offset center and a vector from that point to somewhere on the surface of the ellipsoid. Something like the lovely old illustrations in Halliday and Resnick would be great but I have no artistic talent.
I have tried the usual Open Source and web based applications, including the Wikipedia recommendations on how to make illustrations for Wikipedia, and can't find a way to get what I would call textbook or tutorial quality figures that clearly illustrate what I can clumsily draw.
The old potato surface and Gauss's Law in Arfken or the stereo pairs in Morse and Feshbach are heads and shoulders above anything I have been able to get from Mathematica's online tools, or Geogebra, or other StackExhange answers etc.
The case I need to draw will show 3 axis, an offset vector from the origin and a vector from the offset to a point on the surface. (It would be a sphere centered on the origin if ideal. There are three offset errors and 3 gain errors).
This may not qualify as a physics question unless I ask for the path the pencil will take to get a projection of the object onto a page. If there is a good list of apps or examples or an answer I have missed, much appreciated.