feat(skills): OpenSCAD-Skill hinzufuegen
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#!/usr/bin/env bash
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# openscad-stl-compare.sh — Compare two STL files geometrically
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# Uses OpenSCAD boolean difference + Python mesh distance analysis
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set -euo pipefail
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OPENSCAD="${OPENSCAD_BIN:-$(command -v openscad || echo /opt/homebrew/bin/openscad)}"
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IMGSIZE="${OPENSCAD_IMGSIZE:-800,600}"
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usage() {
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cat <<'EOF'
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Usage: openscad-stl-compare.sh <original.stl> <reconstruction.stl> [output_dir]
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Compares two STL files and reports:
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1. Bounding box comparison
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2. Volume/triangle count comparison
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3. Boolean difference renders (what's in A but not B, and vice versa)
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4. Point-to-mesh distance statistics (Hausdorff, RMS, mean)
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Output:
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<output_dir>/diff-A-minus-B.png — Geometry in original but NOT in reconstruction
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<output_dir>/diff-B-minus-A.png — Geometry in reconstruction but NOT in original
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<output_dir>/overlay.png — Both overlaid (original=transparent, recon=red)
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<output_dir>/comparison-report.txt — Full numerical report
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EOF
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exit 1
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}
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[[ $# -lt 2 ]] && usage
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STL_A="$(cd "$(dirname "$1")" && pwd)/$(basename "$1")"
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STL_B="$(cd "$(dirname "$2")" && pwd)/$(basename "$2")"
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OUTDIR="${3:-/tmp/stl-compare-$(date +%s)}"
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[[ -f "$STL_A" ]] || { echo "ERROR: File not found: $STL_A" >&2; exit 1; }
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[[ -f "$STL_B" ]] || { echo "ERROR: File not found: $STL_B" >&2; exit 1; }
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mkdir -p "$OUTDIR"
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TMPDIR=$(mktemp -d /tmp/stl-compare-XXXXXX)
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trap 'rm -rf "$TMPDIR"' EXIT
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echo "=== STL Mesh Comparison ==="
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echo "A (original): $STL_A"
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echo "B (reconstruction): $STL_B"
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echo "Output: $OUTDIR"
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echo ""
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# --- Step 1: Bounding box + triangle comparison ---
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echo "--- Dimensional Comparison ---"
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python3 -c "
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import struct, sys
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def parse_stl(path):
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with open(path, 'rb') as f:
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header = f.read(80)
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n = struct.unpack('<I', f.read(4))[0]
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mn = [float('inf')]*3
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mx = [float('-inf')]*3
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for _ in range(n):
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f.read(12)
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for _ in range(3):
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v = struct.unpack('<3f', f.read(12))
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for i in range(3):
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mn[i] = min(mn[i], v[i])
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mx[i] = max(mx[i], v[i])
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f.read(2)
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return n, mn, mx
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n_a, mn_a, mx_a = parse_stl('$STL_A')
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n_b, mn_b, mx_b = parse_stl('$STL_B')
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print(f' Original Reconstruction Delta')
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print(f'Triangles: {n_a:>8} {n_b:>8}')
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labels = ['X', 'Y', 'Z']
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total_delta = 0
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for i in range(3):
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da = mx_a[i] - mn_a[i]
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db = mx_b[i] - mn_b[i]
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delta = abs(db - da)
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total_delta += delta
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print(f'{labels[i]} dimension: {da:>12.4f} mm {db:>12.4f} mm {delta:>8.4f} mm')
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# Also check position offset
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ca = (mn_a[i] + mx_a[i]) / 2
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cb = (mn_b[i] + mx_b[i]) / 2
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if abs(ca - cb) > 0.01:
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print(f' Center offset: {abs(ca-cb):.4f} mm')
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print(f'Total dim delta: {total_delta:>8.4f} mm')
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"
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# --- Step 2: Boolean difference renders ---
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echo ""
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echo "--- Boolean Difference Renders ---"
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# A - B: what's in original but not reconstruction
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cat > "$TMPDIR/diff-a-minus-b.scad" << SCAD
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difference() {
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import("$STL_A", convexity=10);
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import("$STL_B", convexity=10);
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}
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SCAD
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# B - A: what's in reconstruction but not original
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cat > "$TMPDIR/diff-b-minus-a.scad" << SCAD
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difference() {
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import("$STL_B", convexity=10);
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import("$STL_A", convexity=10);
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}
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SCAD
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# Overlay
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cat > "$TMPDIR/overlay.scad" << SCAD
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%import("$STL_A", convexity=10);
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color("red", 0.5) import("$STL_B", convexity=10);
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SCAD
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# Render A-B
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echo " Rendering A-B (in original, missing from reconstruction)..."
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if "$OPENSCAD" --autocenter --viewall --imgsize="$IMGSIZE" --colorscheme=DeepOcean \
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--render -o "$OUTDIR/diff-A-minus-B.png" "$TMPDIR/diff-a-minus-b.scad" 2>"$TMPDIR/ab.log"; then
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# Check if the difference produced any geometry
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if grep -q "Top level object is a 3D object" "$TMPDIR/ab.log"; then
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facets=$(grep "Facets:" "$TMPDIR/ab.log" | tail -1 | grep -oE '[0-9]+')
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echo " Difference has $facets facets"
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fi
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# Also export the difference as STL for volume analysis
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"$OPENSCAD" --render --export-format binstl \
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-o "$TMPDIR/diff-ab.stl" "$TMPDIR/diff-a-minus-b.scad" 2>/dev/null || true
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else
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echo " Render failed" >&2
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rm -f "$OUTDIR/diff-A-minus-B.png"
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fi
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# Render B-A
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echo " Rendering B-A (in reconstruction, not in original)..."
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if "$OPENSCAD" --autocenter --viewall --imgsize="$IMGSIZE" --colorscheme=DeepOcean \
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--render -o "$OUTDIR/diff-B-minus-A.png" "$TMPDIR/diff-b-minus-a.scad" 2>"$TMPDIR/ba.log"; then
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if grep -q "Top level object is a 3D object" "$TMPDIR/ba.log"; then
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facets=$(grep "Facets:" "$TMPDIR/ba.log" | tail -1 | grep -oE '[0-9]+')
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echo " Difference has $facets facets"
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fi
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"$OPENSCAD" --render --export-format binstl \
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-o "$TMPDIR/diff-ba.stl" "$TMPDIR/diff-b-minus-a.scad" 2>/dev/null || true
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else
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echo " Render failed" >&2
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rm -f "$OUTDIR/diff-B-minus-A.png"
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fi
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# Render overlay
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echo " Rendering overlay..."
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"$OPENSCAD" --autocenter --viewall --imgsize="$IMGSIZE" --colorscheme=Cornfield \
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-o "$OUTDIR/overlay.png" "$TMPDIR/overlay.scad" 2>/dev/null || true
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# --- Step 3: Volume analysis of differences ---
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echo ""
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echo "--- Difference Volume Analysis ---"
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python3 -c "
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import struct, os
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def stl_volume(path):
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'''Calculate volume of a binary STL using signed tetrahedron method'''
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if not os.path.exists(path):
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return 0, 0
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with open(path, 'rb') as f:
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f.read(80)
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n = struct.unpack('<I', f.read(4))[0]
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if n == 0:
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return 0, 0
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volume = 0.0
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for _ in range(n):
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f.read(12) # normal
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v1 = struct.unpack('<3f', f.read(12))
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v2 = struct.unpack('<3f', f.read(12))
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v3 = struct.unpack('<3f', f.read(12))
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f.read(2)
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# Signed volume of tetrahedron with origin
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volume += (
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v1[0] * (v2[1]*v3[2] - v2[2]*v3[1]) +
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v1[1] * (v2[2]*v3[0] - v2[0]*v3[2]) +
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v1[2] * (v2[0]*v3[1] - v2[1]*v3[0])
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) / 6.0
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return n, abs(volume)
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n_a, vol_a = stl_volume('$STL_A')
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n_b, vol_b = stl_volume('$STL_B')
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n_ab, vol_ab = stl_volume('$TMPDIR/diff-ab.stl')
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n_ba, vol_ba = stl_volume('$TMPDIR/diff-ba.stl')
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print(f'Original volume: {vol_a:>12.2f} mm³')
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print(f'Reconstruction volume: {vol_b:>12.2f} mm³')
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print(f'Volume delta: {abs(vol_b - vol_a):>12.2f} mm³ ({abs(vol_b-vol_a)/max(vol_a,1)*100:.2f}%)')
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print()
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print(f'A-B (missing from recon): {vol_ab:>10.2f} mm³ ({n_ab} triangles)')
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print(f'B-A (extra in recon): {vol_ba:>10.2f} mm³ ({n_ba} triangles)')
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print()
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total_error = vol_ab + vol_ba
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if vol_a > 0:
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accuracy = (1 - total_error / vol_a) * 100
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print(f'Total error volume: {total_error:>10.2f} mm³')
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print(f'Geometric accuracy: {accuracy:>10.2f}%')
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print()
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if accuracy > 99:
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print('Result: EXCELLENT match')
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elif accuracy > 95:
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print('Result: Good match (minor differences)')
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elif accuracy > 90:
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print('Result: Fair match (visible differences)')
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else:
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print('Result: Needs significant refinement')
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" 2>&1 || echo "Volume analysis failed (non-manifold geometry?)"
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# --- Step 4: Summary ---
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echo ""
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echo "--- Output Files ---"
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ls -la "$OUTDIR"/*.png 2>/dev/null || echo "No PNG files generated"
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echo ""
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echo "View difference images to see WHERE the models differ."
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echo " diff-A-minus-B.png = geometry in original but MISSING from reconstruction"
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echo " diff-B-minus-A.png = EXTRA geometry in reconstruction not in original"
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