Function recomputeFaceNormal

js/regularize.js:132–146

(t)

  }

  // Per-triangle face normal (unit) + flag for deleted tris
  const triNrmX = new Float32Array(triCount);
  const triNrmY = new Float32Array(triCount);
  const triNrmZ = new Float32Array(triCount);
  const triDeleted = new Uint8Array(triCount);
  const newParentId = new Int32Array(faceParentId);

  function recomputeFaceNormal(t) {
    const a = corners[t*3], b = corners[t*3+1], c = corners[t*3+2];
    const ax = vertX[a], ay = vertY[a], az = vertZ[a];
    const e1x = vertX[b]-ax, e1y = vertY[b]-ay, e1z = vertZ[b]-az;
    const e2x = vertX[c]-ax, e2y = vertY[c]-ay, e2z = vertZ[c]-az;
    const nx = e1y*e2z - e1z*e2y;
    const ny = e1z*e2x - e1x*e2z;
    const nz = e1x*e2y - e1y*e2x;
    const len = Math.sqrt(nx*nx + ny*ny + nz*nz);
    if (len > 0) {
      triNrmX[t] = nx/len; triNrmY[t] = ny/len; triNrmZ[t] = nz/len;