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the Milkyway Galaxy disc is roughly 100,000 - 200,000 Lys in diameter ( cut in half that would be about 50,000-100,000 for each half ) how do I go about making 2 partial discs in astrosynthesis 3.0 and populating them with stars, planets, etc.? while retaining the shape of a disc?...can it be done??
The full Milky Way has hundreds of billions of stars, so its not something Astro would be able to map out in its entirety.
But if you just want a general disk shape, you might use a script to compress the stars in a spherical sector along the Y (vertical) axis. There is one in this package here called "squash" that might do the trick:
The alternative is a script that deletes systems in a spherical sector that lie outside a disk. Six of one, half dozen of the other
If you want spiraling arms and such, I think you'd have to roll something significantly more sophisticated. You would probably need to generate straight arms that intersect the center, and then rotate them to get the spiral look.