MeshObj* ObjLoader::loadObjFile(std::string fileName, std::string ID) {
// sanity check for identfier -> must not be empty //
if (ID.length() == 0) {
return NULL;
}
// try to load the MeshObj for ID //
MeshObj* meshObj = getMeshObj(ID);
if (meshObj != NULL) {
// if found, return it instead of loading a new one from file //
return meshObj;
}
// ID is not known yet -> try to load mesh from file //
// TODO: import mesh from given file //
// setup variables used for parsing //
std::string key;
float x, y, z;
unsigned int i, j, k;
// setup local lists //
MeshData meshData;
// setup tools for parsing a line correctly //
std::string line;
std::stringstream sstr;
// open file //
std::ifstream file(fileName.c_str());
if (file.is_open()) {
while (file.good()) {
key = "";
getline(file, line);
sstr.clear();
sstr.str(line);
sstr >> key;
if (!key.compare("v")) {
// read in vertex //
sstr >> x >> y >> z;
meshData.vertex_position.push_back(x);
meshData.vertex_position.push_back(y);
meshData.vertex_position.push_back(z);
}
if (!key.compare("vn")) {
// read in vertex normal //
sstr >> x >> y >> z;
meshData.vertex_normal.push_back(x);
meshData.vertex_normal.push_back(y);
meshData.vertex_normal.push_back(z);
}
if (!key.compare("f")) {
// read in vertex indices for a face //
sstr >> i >> j >> k;
meshData.indices.push_back(i - 1);
meshData.indices.push_back(j - 1);
meshData.indices.push_back(k - 1);
}
MeshObj* ObjLoader::loadObjFile(std::string fileName, std::string ID, float scale) {
// sanity check for identfier -> must not be empty //
if (ID.length() == 0) {
return NULL;
}
// try to load the MeshObj for ID //
MeshObj* obj = getMeshObj(ID);
if (obj != NULL) {
// if found, return it instead of loading a new one from file //
return obj;
}
// ID is not known yet -> try to load mesh from file //
// setup variables used for parsing //
std::string key;
float x, y, z;
int vi[4];
int ni[4];
int ti[4];
// setup local lists //
std::vector<Point3D> localVertexList;
std::vector<Point3D> localNormalList;
std::vector<Point3D> localTexCoordList;
std::vector<Face> localFaceList;
// setup tools for parsing a line correctly //
std::string line;
std::stringstream sstr;
// open file //
std::ifstream file(fileName.c_str());
unsigned int lineNumber = 0;
if (file.is_open()) {
while (file.good()) {
key = "";
getline(file, line);
sstr.clear();
sstr.str(line);
sstr >> key;
if (!key.compare("v")) {
// read in vertex //
sstr >> x >> y >> z;
localVertexList.push_back(Point3D(x * scale, y * scale, z * scale));
}
if (!key.compare("vn")) {
// read in normal //
sstr >> x >> y >> z;
localNormalList.push_back(Point3D(x, y, z));
}
if (!key.compare("vt")) {
// read in texture coordinate //
sstr >> x >> y;
localTexCoordList.push_back(Point3D(x, y, 0));
}
MeshObj* ObjLoader::loadObjFile(std::string fileName, std::string ID, float scale) {
// sanity check for identfier -> must not be empty //
if (ID.length() == 0) {
return NULL;
}
// try to load the MeshObj for ID //
MeshObj* obj = getMeshObj(ID);
if (obj != NULL) {
// if found, return it instead of loading a new one from file //
return obj;
}
// ID is not known yet -> try to load mesh from file //
// TODO: extend your objLoader to load vertices, vertex normals and texture coordinates
// note: faces using normals and texture coordinates are defines as "f vi0/ti0/ni0 ... viN/tiN/niN"
// vi0 .. viN : vertex index of vertex 0..N
// ti0 .. tiN : texture coordinate index of vertex 0..N
// ni0 .. niN : vertex normal index of vertex 0..N
// faces without normals and texCoords are defined as "f vi0// ... viN//"
// faces without texCoords are defined as "f vi0//ni0 ... viN//niN"
// make your parser robust against ALL possible combinations
// also allow to import QUADS as faces. directly split them up into two triangles!
// setup variables used for parsing //
std::string key;
float x, y, z;
int vi[4];
int ni[4];
int ti[4];
// setup local lists //
// import all data in temporary lists first //
std::vector<Point3D> localVertexList;
std::vector<Point3D> localNormalList;
std::vector<Point3D> localTexCoordList;
std::vector<Face> localFaceList;
// setup tools for parsing a line correctly //
std::string line;
std::stringstream sstr;
// open file //
std::ifstream file(fileName.c_str());
unsigned int lineNumber = 0;
if (file.is_open()) {
while (file.good()) {
key = "";
getline(file, line);
sstr.clear();
sstr.str(line);
sstr >> key;
if (!key.compare("v")) {
// read in vertex //
sstr >> x >> y >> z;
localVertexList.push_back(Point3D(x * scale, y * scale, z * scale));
}
// DONE: implement parsing of vertex normals and texture coordinates //
if (key == "vn") {
sstr >> x >> y >> z;
localNormalList.push_back(Point3D(x, y, z));
}
if (key == "vt") {
sstr >> x >> y;
localTexCoordList.push_back(Point3D(x, y));
}
MeshObj* ObjLoader::loadObjFile(std::string fileName, std::string ID) {
// sanity check for identfier -> must not be empty //
if (ID.length() == 0) {
return NULL;
}
// try to load the MeshObj for ID //
MeshObj* meshObj = getMeshObj(ID);
if (meshObj != NULL) {
// if found, return it instead of loading a new one from file //
return meshObj;
}
// ID is not known yet -> try to load mesh from file //
// import mesh from given file //
// setup temporary data container //
MeshData meshData;
// Öffne die angeforderte Datei
std::fstream file ;
file.open(fileName.c_str() , std::fstream::in );
// Prüfe, ob das Öffnen erfolgreich war
if (! file.is_open()) {
std::cerr << fileName << " konnte nicht geöffnet werden.";
return NULL;
}
// Lies die Zeilen einzeln ein, entscheide je nach Anfang der Zeile, ob sie
// eine Position eine Normale oder ein Index ist. Hänge die Werte ans richtige
// Array an.
char temp[50];
GLfloat x,y,z;
while(file.getline(temp,50) && !file.eof()){
if(strncmp(temp,"v ",2) == 0){
sscanf(temp,"v %f %f %f", &x,&y,&z);
meshData.vertex_position.push_back(x);
meshData.vertex_position.push_back(y);
meshData.vertex_position.push_back(z);
}
if(strncmp(temp,"vn ",3) == 0){
sscanf(temp,"vn %f %f %f", &x, &y, &z);
meshData.vertex_normal.push_back(x);
meshData.vertex_normal.push_back(y);
meshData.vertex_normal.push_back(z);
}
if(strncmp(temp,"f ",2) == 0 ){
sscanf(temp,"f %f %f %f", &x,&y,&z);
meshData.indices.push_back(x);
meshData.indices.push_back(y);
meshData.indices.push_back(z);
}
}
// setup variables used for parsing //
// create new MeshObj and set imported geoemtry data //
meshObj = new MeshObj();
// TODO: assign imported data to this new MeshObj //
meshObj->setData(meshData);
// insert MeshObj into map //
mMeshMap.insert(std::make_pair(ID, meshObj));
// return newly created MeshObj //
return meshObj;
}
