Function parseTransform

js/stlLoader.js:347–360

(str)

  // transform — both rotation/scale parts and translation parts.
  const rootUnit  = (rootDoc.documentElement.getAttribute('unit') || 'millimeter').toLowerCase();
  const unitScale = UNIT_TO_MM[rootUnit] ?? 1;
  const unitMatrix = new THREE.Matrix4().makeScale(unitScale, unitScale, unitScale);

  // Collect final mesh instances: { meshKey, matrix }
  const instances = [];

  function parseTransform(str) {
    if (!str) return new THREE.Matrix4();
    const v = str.trim().split(/\s+/).map(Number);
    if (v.length === 12) {
      // 3MF row-major 3×4: m00 m01 m02  m10 m11 m12  m20 m21 m22  tx ty tz
      return new THREE.Matrix4().set(
        v[0], v[3], v[6], v[9],
        v[1], v[4], v[7], v[10],
        v[2], v[5], v[8], v[11],
        0,    0,    0,    1,
      );