addFace method

Implementation

void addFace(String a, String b, String c, String? ua, String? ub, String? uc, String? na, String? nb, String? nc) {
  final vLen = vertices.length;

  int ia = parseVertexIndex(a, vLen);
  int ib = parseVertexIndex(b, vLen);
  int ic = parseVertexIndex(c, vLen);

  addVertex(ia, ib, ic);
  addColor(ia, ib, ic);

  // normals

  if (na != null && na != '') {
    final nLen = normals.length;

    ia = parseNormalIndex(na, nLen);
    ib = parseNormalIndex(nb!, nLen);
    ic = parseNormalIndex(nc!, nLen);

    addNormal(ia, ib, ic);
  }
  else {
    addFaceNormal(ia, ib, ic);
  }

  // uvs

  if (ua != null && ua != '') {
    final uvLen = uvs.length;

    ia = parseUVIndex(ua, uvLen);
    ib = parseUVIndex(ub!, uvLen);
    ic = parseUVIndex(uc!, uvLen);

    addUV(ia, ib, ic);

    object!.geometry["hasUVIndices"] = true;
  }
  else {
    // add placeholder values (for inconsistent face definitions)
    addDefaultUV();
  }
}