carmie / planetarium

Some scripts to generate a 3D printable planetarium from the HYG Star Database

planetarium

Some scripts to generate a 3D printable planetarium from the HYG Star Database http://www.astronexus.com/hyg

OpenSCAD is a bit of a pig for this task, it's single threaded & memory intensive. For this reason, the work is broken up into separate steps.

Star_rods.sh generates the star rods for later subtraction. It breaks the work in 32 chunks, and spawns an OpenSCAD instance for each chunk. This takes about 15 minutes on a Threadripper 1950x. The script then concatenates the result into a single ASCII STL file.

Star_sphere.sh creates a spherical shell, and subtracts the rods from it. This runs as a single thread, and took about 2 hours. You maf need to build the latest LibCSG from source in order to complete in a reasonable amount of time.

Prerequisites

• OpenSCAD Nightly (Generates the STLs. Nightly possibly isn't necessary, but in what in hardcoded in the scripts, you could use the GUI instead)
• Python3 (Generates the star map OpenSCAD array. This is already in the repository, so this is only necessary if you want to alter the array)

Usage

OpenSCAD-Converter.py  # this are already done, but may be used to regenerate starmap.scad from the HYG Star Database
star_rods.sh   # Generates rods for each star
star_sphere.sh  # Subtracts rods from a spherical shell

License

All code is licensed under the Gnu Public License 3.0 https://www.gnu.org/licenses/gpl-3.0.en.html