/*! \brief load the geometry defined in an OBJ/Wavefront file
* \param filename is the path to the OJB file
*/
ObjReader::ObjReader(const char *filename)
{
std::ifstream ifs;
// extract the path from the filename (used to read the material file)
std::string path = getFilePath(filename);
try {
ifs.open(filename);
if (ifs.fail()) throw std::runtime_error("can't open file " + std::string(filename));
// create a default material
std::shared_ptr<Material> defaultMaterial(new Material("Default"));
curMaterial = defaultMaterial;
char line[MAX_LINE_LENGTH]; // line buffer
while (ifs.peek() != EOF) // read each line until EOF is found
{
ifs.getline(line, sizeof(line), '\n');
const char* token = line + strspn(line, " \t"); // ignore space and tabs
//printf("strncmp(token, vt, 2) --> %d\n", strncmp(token, "vt", 2));
if (token[0] == 0) continue; // line is empty, ignore
// read a vertex
if (token[0] == 'v' && isSep(token[1])) { v.push_back(getVec3f(token += 2)); continue; }
// read a normal
if (!strncmp(token, "vn", 2) && isSep(token[2])) { vn.push_back(getVec3f(token += 3)); continue; }
// read a texture coordinates
if (!strncmp(token, "vt", 2) && isSep(token[2])) { vt.push_back(getVec2f(token += 3)); continue; }
//if (!strncmp(token, "vt", 2) && isSep(token[2])) { printf("vt: %.3f\n", getVec2f(token += 3).x); continue; }
// read a face
if (token[0] == 'f' && isSep(token[1])) {
parseSep(token += 1);
std::vector<Vertex> face;
while (token[0]) {
face.push_back(getInt3(token));
parseSepOpt(token);
}
curGroup.push_back(face);
continue;
}
/*! use material */
if (!strncmp(token, "usemtl", 6) && isSep(token[6]))
{
flushFaceGroup();
std::string name(parseSep(token += 6));
if (materials.find(name) == materials.end()) curMaterial = defaultMaterial;
else curMaterial = materials[name];
continue;
}
/* load material library */
if (!strncmp(token, "mtllib", 6) && isSep(token[6])) {
loadMTL(path + "/" + std::string(parseSep(token += 6)));
continue;
}
}
}
catch (const std::exception &e) {
std::cerr << e.what() << std::endl;
}
flushFaceGroup(); // flush the last loaded object
ifs.close();
}
OBJLoader::OBJLoader(const FileName &fileName, const bool subdivMode)
: path(fileName.path()), group(new SceneGraph::GroupNode), subdivMode(subdivMode)
{
/* open file */
std::ifstream cin;
cin.open(fileName.c_str());
if (!cin.is_open()) {
THROW_RUNTIME_ERROR("cannot open " + fileName.str());
return;
}
/* generate default material */
Material objmtl; new (&objmtl) OBJMaterial;
Ref<SceneGraph::MaterialNode> defaultMaterial = new SceneGraph::MaterialNode(objmtl);
curMaterial = defaultMaterial;
char line[10000];
memset(line, 0, sizeof(line));
while (cin.peek() != -1)
{
/* load next multiline */
char* pline = line;
while (true) {
cin.getline(pline, sizeof(line) - (pline - line) - 16, '\n');
ssize_t last = strlen(pline) - 1;
if (last < 0 || pline[last] != '\\') break;
pline += last;
*pline++ = ' ';
}
const char* token = trimEnd(line + strspn(line, " \t"));
if (token[0] == 0) continue;
/*! parse position */
if (token[0] == 'v' && isSep(token[1])) {
v.push_back(getVec3f(token += 2)); continue;
}
/* parse normal */
if (token[0] == 'v' && token[1] == 'n' && isSep(token[2])) {
vn.push_back(getVec3f(token += 3));
continue;
}
/* parse texcoord */
if (token[0] == 'v' && token[1] == 't' && isSep(token[2])) { vt.push_back(getVec2f(token += 3)); continue; }
/*! parse face */
if (token[0] == 'f' && isSep(token[1]))
{
parseSep(token += 1);
std::vector<Vertex> face;
while (token[0]) {
Vertex vtx = getInt3(token);
face.push_back(vtx);
parseSepOpt(token);
}
curGroup.push_back(face);
continue;
}
/*! parse edge crease */
if (token[0] == 'e' && token[1] == 'c' && isSep(token[2]))
{
parseSep(token += 2);
float w = getFloat(token);
parseSepOpt(token);
int a = fix_v(getInt(token));
parseSepOpt(token);
int b = fix_v(getInt(token));
parseSepOpt(token);
ec.push_back(Crease(w, a, b));
continue;
}
/*! use material */
if (!strncmp(token, "usemtl", 6) && isSep(token[6]))
{
flushFaceGroup();
std::string name(parseSep(token += 6));
if (material.find(name) == material.end()) curMaterial = defaultMaterial;
else curMaterial = material[name];
continue;
}
/* load material library */
if (!strncmp(token, "mtllib", 6) && isSep(token[6])) {
loadMTL(path + std::string(parseSep(token += 6)));
continue;
}
// ignore unknown stuff
}
flushFaceGroup();
cin.close();
}
