addVertexToGeo()

in packages/miew/src/gfx/geometries/SSIsosurfaceGeometry.js [568:624]
51 lines of code
11 McCabe index (conditional complexity)

  addVertexToGeo(geoOut, vAdd) {
    let entry;
    const oneHynberes = 0.01;
    const n815851 = 815851;
    const n37633 = 37633;
    const n2453543 = 2453543;
    const r106 = 1.0e-6;

    const hashResolution = this.marCubeResoultion << 2;
    const v = new THREE.Vector3();
    const ix = Math.floor(hashResolution * (vAdd.x - this.vBoxMin.x) / (this.vBoxMax.x + oneHynberes - this.vBoxMin.x));
    const iy = Math.floor(hashResolution * (vAdd.y - this.vBoxMin.y) / (this.vBoxMax.y + oneHynberes - this.vBoxMin.y));
    const iz = Math.floor(hashResolution * (vAdd.z - this.vBoxMin.z) / (this.vBoxMax.z + oneHynberes - this.vBoxMin.z));
    let iHash = ix * n815851 + iz * n37633 + iy * n2453543;
    iHash &= (HASH_SIZE - 1);
    const hLineIndex = iHash + iHash;

    // search vertex via hash
    // search in hash list
    if (this.vBoxMin !== null && this.vBoxMax !== null) {
      for (entry = this.hashLines[hLineIndex + 1]; entry >= 0; entry = this.hashEntries[entry * 2 + 1]) {
        const ind = this.hashEntries[entry * 2 + 0]; // vertex index
        v.copy(geoOut._vertices[ind]);
        v.x -= vAdd.x;
        v.y -= vAdd.y;
        v.z -= vAdd.z;
        const dot2 = v.x * v.x + v.y * v.y + v.z * v.z;
        if (dot2 < r106) {
          return ind;
        } // if (found)
      } // for (entry)
    } // search

    // add new vertex to geometry
    if (geoOut._numVertices >= this.maxNumVertices) {
      return 0 - 1;
    }

    const iVertAdd = geoOut._numVertices;
    geoOut._vertices[iVertAdd].copy(vAdd);

    // add to hash
    if (this.vBoxMin !== null && this.vBoxMax !== null) {
      entry = this.getNewHashEntry();
      if (entry < 0) {
        return 0 - 1;
      }
      const entryFirst = this.hashLines[hLineIndex + 1];
      this.hashLines[hLineIndex + 1] = entry;
      this.hashEntries[entry * 2 + 0] = iVertAdd;
      this.hashEntries[entry * 2 + 1] = entryFirst;

      this.hashLines[hLineIndex + 0]++; // num vertices in line ++
    }
    geoOut._numVertices++;
    return iVertAdd;
  }