Jerry
88 lines
3.0 KiB
Bash
Executable File
88 lines
3.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# render.sh — turn a CADAM benchmark .scad into an orbiting GIF (and an optional
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# multi-view contact sheet for inspection). Mirrors how CADAM previews models in
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# the browser: BOSL2/MCAD on the library path, color() parts preserved, a clean
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# orbit around the vertical axis.
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#
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# Usage:
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# ./render.sh model.scad -> model.gif (orbit)
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# ./render.sh model.scad out.gif -> out.gif
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# ./render.sh --sheet model.scad -> model.sheet.png (iso/front/right/top)
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#
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# Env knobs (sane defaults):
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# FRAMES=36 SIZE=520 ELEV=62 FPS=24 COLORSCHEME=Tomorrow BG=#0d1117
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#
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set -euo pipefail
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# --- locate the OpenSCAD CLI (snapshot/nightly first, then stable) ------------
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find_openscad() {
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if [[ -n "${OPENSCAD_BIN:-}" && -x "${OPENSCAD_BIN}" ]]; then echo "${OPENSCAD_BIN}"; return; fi
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for c in \
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"/Applications/OpenSCAD (Nightly).app/Contents/MacOS/OpenSCAD" \
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"/Applications/OpenSCAD.app/Contents/MacOS/OpenSCAD" \
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"$(command -v openscad 2>/dev/null || true)"; do
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[[ -n "$c" && -x "$c" ]] && { echo "$c"; return; }
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done
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echo "ERROR: OpenSCAD CLI not found. Set OPENSCAD_BIN." >&2; exit 1
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}
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OSCAD="$(find_openscad)"
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# BOSL2 / BOSL / MCAD live here (unzipped from public/libraries/*.zip).
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export OPENSCADPATH="${OPENSCADPATH:-/tmp/oscad-libs}"
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FRAMES="${FRAMES:-36}"
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SIZE="${SIZE:-520}"
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ELEV="${ELEV:-62}"
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FPS="${FPS:-24}"
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COLORSCHEME="${COLORSCHEME:-Tomorrow}" # clean near-white backdrop
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RENDER_FLAG="${RENDER_FLAG:---render}" # full (manifold) render; --preview is faster but CSG-fuzzy
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SHEET=0
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if [[ "${1:-}" == "--sheet" ]]; then SHEET=1; shift; fi
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SRC="${1:?usage: render.sh [--sheet] model.scad [out.(gif|png)]}"
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BASE="$(basename "${SRC%.scad}")"
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DIR="$(cd "$(dirname "$SRC")" && pwd)"
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OUT="${2:-}"
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delay=$(awk "BEGIN{printf \"%.0f\", 100/${FPS}}")
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tmp="$(mktemp -d)"
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trap 'rm -rf "$tmp"' EXIT
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render_frame() { # rotx roty rotz file
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"$OSCAD" -o "$4" --imgsize="${SIZE},${SIZE}" --projection=perspective \
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--colorscheme="$COLORSCHEME" $RENDER_FLAG --viewall --autocenter \
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--camera="0,0,0,$1,$2,$3,0" "$SRC" 2>"$tmp/err.log" || {
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echo "OpenSCAD failed on $SRC:" >&2; cat "$tmp/err.log" >&2; exit 1; }
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}
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if [[ "$SHEET" == "1" ]]; then
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OUT="${OUT:-$DIR/$BASE.sheet.png}"
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render_frame 62 0 25 "$tmp/iso.png"
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render_frame 90 0 0 "$tmp/front.png"
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render_frame 90 0 90 "$tmp/right.png"
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render_frame 0 0 0 "$tmp/top.png"
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magick montage "$tmp/iso.png" "$tmp/front.png" "$tmp/right.png" "$tmp/top.png" \
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-label '' -tile 2x2 -geometry +6+6 -background white "$OUT"
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echo "wrote $OUT"
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exit 0
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fi
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OUT="${OUT:-$DIR/$BASE.gif}"
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echo "rendering $FRAMES frames of $BASE ..."
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i=0
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while [[ $i -lt $FRAMES ]]; do
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az=$(awk "BEGIN{printf \"%.2f\", $i*360/$FRAMES}")
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printf -v n "%03d" "$i"
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render_frame "$ELEV" 0 "$az" "$tmp/f_$n.png"
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i=$((i+1))
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done
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echo "assembling $OUT ..."
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magick -delay "$delay" -loop 0 "$tmp"/f_*.png \
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-layers OptimizePlus -fuzz 3% -colors 200 "$OUT"
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# second pass: strip + max compression
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magick "$OUT" -strip -layers Optimize "$OUT"
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echo "wrote $OUT ($(du -h "$OUT" | cut -f1))"
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