adding piggy bank benchmark for testing mesh preprocessing development

Author: jgphilpott

examples/scripts/slice-piggy.js

@@ -0,0 +1,106 @@
+/**
+ * Example: slice the piggy bank test model from an STL and write G-code to resources/gcode/benchmarks.
+ *
+ * Usage:
+ *   node examples/scripts/slice-piggy.js
+ */
+
+const { Polyslice, Printer, Filament } = require("../../src/index");
+const fs = require("fs");
+const path = require("path");
+const THREE = require("three");
+
+async function loadSTLMesh(stlPath) {
+  const { STLLoader } = await import("three/examples/jsm/loaders/STLLoader.js");
+  const buffer = fs.readFileSync(stlPath);
+  const loader = new STLLoader();
+  const geometry = loader.parse(buffer.buffer);
+  geometry.computeVertexNormals?.();
+  const material = new THREE.MeshPhongMaterial({ color: 0x808080, specular: 0x111111, shininess: 200 });
+  const mesh = new THREE.Mesh(geometry, material);
+
+  // Place bottom at Z=0 (build plate)
+  geometry.computeBoundingBox();
+  const bb = geometry.boundingBox;
+  const zShift = -bb.min.z;
+  mesh.position.set(0, 0, zShift);
+  mesh.updateMatrixWorld();
+  return mesh;
+}
+
+async function main() {
+  console.log("Polyslice Piggy Bank Example");
+  console.log("============================\n");
+
+  const stlPath = path.join(__dirname, "../../resources/testing/piggy/bank.test.stl");
+
+  const printer = new Printer("Ender5");
+  const filament = new Filament("GenericPLA");
+
+  console.log("Printer & Filament:");
+  console.log(`- Printer: ${printer.model}`);
+  console.log(`- Volume: ${printer.getSizeX()}x${printer.getSizeY()}x${printer.getSizeZ()} mm`);
+  console.log(`- Filament: ${filament.name} (${filament.type.toUpperCase()})\n`);
+
+  console.log("Loading STL...");
+  console.log(`- ${stlPath}`);
+
+  let mesh;
+  try {
+    mesh = await loadSTLMesh(stlPath);
+  } catch (err) {
+    console.error("Failed to load STL:", err.message);
+    process.exit(1);
+  }
+
+  const pos = mesh.geometry.attributes.position;
+  const triApprox = pos ? ((pos.count / 3) | 0) : null;
+  console.log("\u2705 Mesh loaded");
+  console.log(`- Geometry: ${mesh.geometry.type}`);
+  console.log(`- Vertices: ${pos ? pos.count : "unknown"}`);
+  if (pos) console.log(`- Triangles (approx): ${triApprox}\n`);
+
+  const slicer = new Polyslice({
+    printer,
+    filament,
+    shellSkinThickness: 0.8,
+    shellWallThickness: 0.8,
+    lengthUnit: "millimeters",
+    timeUnit: "seconds",
+    infillPattern: "grid",
+    infillDensity: 20,
+    bedTemperature: 0,
+    layerHeight: 0.2,
+    testStrip: false,
+    metadata: false,
+    verbose: true
+  });
+
+  console.log("Slicing model...");
+  const t0 = Date.now();
+  const gcode = slicer.slice(mesh);
+  const dt = Date.now() - t0;
+  console.log(`\u2705 Sliced in ${dt} ms`);
+
+  // Save G-code into resources/gcode/benchmarks
+  const outDir = path.join(__dirname, "../../resources/gcode/benchmarks");
+  if (!fs.existsSync(outDir)) fs.mkdirSync(outDir, { recursive: true });
+  const outPath = path.join(outDir, "piggy-bank.gcode");
+  fs.writeFileSync(outPath, gcode);
+
+  const size = fs.statSync(outPath).size;
+  const lines = gcode.split("\n");
+  const layers = lines.filter(l => l.includes("LAYER:")).length;
+
+  console.log("G-code Summary:");
+  console.log(`- File: ${outPath}`);
+  console.log(`- Size: ${(size/1024).toFixed(1)} KB`);
+  console.log(`- Lines: ${lines.length}`);
+  console.log(`- Layers: ${layers}`);
+  console.log("Done.");
+}
+
+main().catch(err => {
+  console.error("Error:", err);
+  process.exit(1);
+});

package.json

@@ -31,7 +31,7 @@
     "slice:wayfinding": "npm run compile && node examples/scripts/slice-holes.js && node examples/scripts/slice-pillars.js",
     "slice:skin": "npm run compile && node examples/scripts/slice-arch.js && node examples/scripts/slice-dome.js && node examples/scripts/slice-pyramid.js",
     "slice:matryoshka": "npm run compile && node examples/scripts/slice-matryoshka.js",
-    "slice:benchmarks": "npm run compile && node examples/scripts/slice-lego.js && node examples/scripts/slice-benchy.js low-poly",
+    "slice:benchmarks": "npm run compile && node examples/scripts/slice-lego.js && node examples/scripts/slice-piggy.js && node examples/scripts/slice-benchy.js low-poly",
     "lint": "eslint src/**/*.js",
     "lint:fix": "eslint src/**/*.js --fix",
     "format": "prettier --write src/**/*.js",

resources/gcode/benchmarks/piggy-bank.gcode

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:805e26afd672ce467ddd062bbb2d18b78aa24aa4bdca14d0f67d313ba14d7b90
+size 6266307