thumbnailer for .stl files

stl2png.sh

#!/bin/bash
# .STL files thumbnailer
# 2022, Paul Philippov, paul@themactep.com

set -euo pipefail

OS=$(command -v openscad || command -v openscad-nightly)

IFS=$'\n\t'

FOO=$(basename "$1")

TMPFILE="/tmp/stl2png_$FOO.scad"

echo "import(\"$1\");" > "$TMPFILE"

$OS -o "$2.png"  -D "\$fn=128" --autocenter --viewall \
    --colorscheme="Cornfield" -q "$TMPFILE"

rm "$TMPFILE"

mogrify -fuzz "1%" -transparent "#ffffe5" -trim +repage -resize "$3x$3>" \
    -gravity center -background transparent -extent "$3x$3" "$2.png"

mv "$2.png" "$2"