model.cpp

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
#include "model.h"

Model::Model(const std::string& filename) {
    std::ifstream in(filename, std::ifstream::in);
    if (in.fail()) return;
    std::string line;
    while (!in.eof()) {
        std::getline(in, line);
        std::istringstream iss(line.c_str());
        char trash;
        if (!line.compare(0, 2, "v ")) {
            iss >> trash;
            Vec3f v;
            iss >> v.x >> v.y >> v.z;
            verts.push_back(v);
        } else if (!line.compare(0, 2, "f ")) {
            std::vector<int> f;
            int itrash, idx;
            iss >> trash;
            while (iss >> idx >> trash >> itrash >> trash >> itrash) {
                idx--; // in wavefront obj all indices start at 1, not zero
                f.push_back(idx);
            }
            faces.push_back(f);
        }
    }
    std::cerr << "# v# " << verts.size() << " f# "  << faces.size() << std::endl;
}

size_t Model::nverts() const {
    return verts.size();
}

size_t Model::nfaces() const {
    return faces.size();
}

std::vector<int> Model::face(size_t idx) const {
    return faces[idx];
}

Vec3f Model::vert(size_t i) const {
    return verts[i];
}