first commit

2026-07-22 13:48:46 +08:00
commit c87751c3dc
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+#!/usr/bin/env bash
+#
+# render.sh — turn a CADAM benchmark .scad into an orbiting GIF (and an optional
+# multi-view contact sheet for inspection). Mirrors how CADAM previews models in
+# the browser: BOSL2/MCAD on the library path, color() parts preserved, a clean
+# orbit around the vertical axis.
+#
+# Usage:
+#   ./render.sh model.scad                 -> model.gif  (orbit)
+#   ./render.sh model.scad out.gif         -> out.gif
+#   ./render.sh --sheet model.scad         -> model.sheet.png (iso/front/right/top)
+#
+# Env knobs (sane defaults):
+#   FRAMES=36 SIZE=520 ELEV=62 FPS=24 COLORSCHEME=Tomorrow BG=#0d1117
+#
+set -euo pipefail
+
+# --- locate the OpenSCAD CLI (snapshot/nightly first, then stable) ------------
+find_openscad() {
+  if [[ -n "${OPENSCAD_BIN:-}" && -x "${OPENSCAD_BIN}" ]]; then echo "${OPENSCAD_BIN}"; return; fi
+  for c in \
+    "/Applications/OpenSCAD (Nightly).app/Contents/MacOS/OpenSCAD" \
+    "/Applications/OpenSCAD.app/Contents/MacOS/OpenSCAD" \
+    "$(command -v openscad 2>/dev/null || true)"; do
+    [[ -n "$c" && -x "$c" ]] && { echo "$c"; return; }
+  done
+  echo "ERROR: OpenSCAD CLI not found. Set OPENSCAD_BIN." >&2; exit 1
+}
+OSCAD="$(find_openscad)"
+
+# BOSL2 / BOSL / MCAD live here (unzipped from public/libraries/*.zip).
+export OPENSCADPATH="${OPENSCADPATH:-/tmp/oscad-libs}"
+
+FRAMES="${FRAMES:-36}"
+SIZE="${SIZE:-520}"
+ELEV="${ELEV:-62}"
+FPS="${FPS:-24}"
+COLORSCHEME="${COLORSCHEME:-Tomorrow}"   # clean near-white backdrop
+RENDER_FLAG="${RENDER_FLAG:---render}"   # full (manifold) render; --preview is faster but CSG-fuzzy
+
+SHEET=0
+if [[ "${1:-}" == "--sheet" ]]; then SHEET=1; shift; fi
+
+SRC="${1:?usage: render.sh [--sheet] model.scad [out.(gif|png)]}"
+BASE="$(basename "${SRC%.scad}")"
+DIR="$(cd "$(dirname "$SRC")" && pwd)"
+OUT="${2:-}"
+
+delay=$(awk "BEGIN{printf \"%.0f\", 100/${FPS}}")
+tmp="$(mktemp -d)"
+trap 'rm -rf "$tmp"' EXIT
+
+render_frame() { # rotx roty rotz file
+  "$OSCAD" -o "$4" --imgsize="${SIZE},${SIZE}" --projection=perspective \
+    --colorscheme="$COLORSCHEME" $RENDER_FLAG --viewall --autocenter \
+    --camera="0,0,0,$1,$2,$3,0" "$SRC" 2>"$tmp/err.log" || {
+      echo "OpenSCAD failed on $SRC:" >&2; cat "$tmp/err.log" >&2; exit 1; }
+}
+
+if [[ "$SHEET" == "1" ]]; then
+  OUT="${OUT:-$DIR/$BASE.sheet.png}"
+  render_frame 62 0 25  "$tmp/iso.png"
+  render_frame 90 0 0   "$tmp/front.png"
+  render_frame 90 0 90  "$tmp/right.png"
+  render_frame 0  0 0   "$tmp/top.png"
+  magick montage "$tmp/iso.png" "$tmp/front.png" "$tmp/right.png" "$tmp/top.png" \
+    -label '' -tile 2x2 -geometry +6+6 -background white "$OUT"
+  echo "wrote $OUT"
+  exit 0
+fi
+
+OUT="${OUT:-$DIR/$BASE.gif}"
+echo "rendering $FRAMES frames of $BASE ..."
+i=0
+while [[ $i -lt $FRAMES ]]; do
+  az=$(awk "BEGIN{printf \"%.2f\", $i*360/$FRAMES}")
+  printf -v n "%03d" "$i"
+  render_frame "$ELEV" 0 "$az" "$tmp/f_$n.png"
+  i=$((i+1))
+done
+
+echo "assembling $OUT ..."
+magick -delay "$delay" -loop 0 "$tmp"/f_*.png \
+  -layers OptimizePlus -fuzz 3% -colors 200 "$OUT"
+# second pass: strip + max compression
+magick "$OUT" -strip -layers Optimize "$OUT"
+echo "wrote $OUT ($(du -h "$OUT" | cut -f1))"