-Mesh* Mesh::load_stl_hash(const QString& filename)
-{
- QFile file(filename);
- file.open(QIODevice::ReadOnly);
-
- QDataStream data(&file);
- data.setByteOrder(QDataStream::LittleEndian);
- data.setFloatingPointPrecision(QDataStream::SinglePrecision);
-
- // Skip .stl file header
- data.skipRawData(80);
-
- // Load the triangle count from the .stl file
- uint32_t tri_count;
- data >> tri_count;
-
- // This vector will store triangles as sets of 3 indices
- std::vector<GLuint> indices(tri_count * 3);
-
- std::vector<GLfloat> verts;
- verts.reserve(tri_count * 9);
-
- QHash<QByteArray, GLuint> map;
- map.reserve(tri_count * 3);
-
- float xyz[3];
- QByteArray v(sizeof(xyz), 0);
- for (unsigned i=0; i < tri_count; ++i)
- {
- // Skip face's normal vector
- data.readRawData(reinterpret_cast<char*>(xyz), 3*sizeof(float));
-
- for (int j=0; j < 3; ++j)
- {
- data >> xyz[0] >> xyz[1] >> xyz[2];
- memcpy(v.data(), xyz, sizeof(xyz));
- if (!map.contains(v))
- {
- map[v] = verts.size() / 3;
- verts.push_back(xyz[0]);
- verts.push_back(xyz[1]);
- verts.push_back(xyz[2]);
- }
- indices[i*3 + j] = map[v];
- }
-
- // Skip face attribute
- data.readRawData(reinterpret_cast<char*>(xyz), sizeof(uint16_t));
- }
-
- return new Mesh(verts, indices);
-}
-