//std::ifstream inputfile(_InputFile, std::ios::in);

std::vector<MeshKernel::iGameVertex> vertices;

std::vector<std::vector<MeshKernel::iGameVertexHandle> > faces;

std::vector<double> move_dist;

std::vector<std::vector<double>> normals;

std::vector<std::vector<double>> uvs;

std::unordered_map<int, int> V2N;// vertex to normal

std::unordered_map<int, int> V2T;// vertex to uv

//std::cout << "Reading " << _InputFile << " File" << std::endl;

FILE *inputfile = fopen(_InputFile.c_str(), "r");

char inputs[100];

while (fscanf(inputfile, "%[^\n]\n", inputs) != EOF) {

string line(inputs);

if (line[0] == '#') {

continue;

}

std::stringstream linestream;

linestream.str(line);

std::string flag;

linestream >> flag;

if (flag == "v") {

double x, y, z;

linestream >> x >> y >> z;

vertices.push_back(MeshKernel::iGameVertex(x, y, z));

} else if (flag == "f") {

std::vector<std::string> vex;

std::string tmp;

while (linestream >> tmp) vex.push_back(tmp);

std::vector<MeshKernel::iGameVertexHandle> face(3);

for (size_t i = 0; i < 3; i++) {

size_t idx = 0;

while (idx < vex[i].length() && std::isdigit(vex[i][idx])) idx++;

int vh = std::stoi(vex[i].substr(0, idx)) - 1;// obj start v from 1

face[i] = (MeshKernel::iGameVertexHandle)(vh);

if (vh >= vertices.size()) {

std::cerr << vh << " " << vertices.size() << std::endl;

}

}

if (vex.size() >= 4)

move_dist.push_back(std::stod(vex[3]));

else

move_dist.push_back(default_move);

faces.push_back(face);

}

}

if (!normals.empty()) {

int ncnt = normals.size();

for (int i = 0; i < vertices.size(); ++i) {

int nidx = V2N[i];

//if (nidx < 0 || nidx >= ncnt) printf("error: nidx = %d\n", nidx);// debug 用

assert(nidx >= 0 && nidx < ncnt);

vertices[i].setNormal(normals[nidx]);

}

}

auto mesh = MeshKernel::SurfaceMesh(vertices, faces, move_dist);

fclose(inputfile);

return mesh;