Converts .obj files to a vector of Triangles.

Loader.cpp

#include <iostream>
#include <fstream>
#include <sstream>
#include "TestModelH.h"

using namespace std;
using glm::vec3;
using glm::vec4;

vector<Triangle> load_obj(string filename) {
  ifstream source(filename);
  vector<vec4> vertices;
  vector<Triangle> triangles;

  string line;

  while (getline(source, line)) {
    istringstream in(line);

    string s;
    in >> s;

    if (s == "v") {
      float x, y, z;
      in >> x >> y >> z;
      vertices.push_back(vec4(x, y, z, 1.f));
    } else if (s == "f") {
      int v1, v2, v3;
      in >> v1 >> v2 >> v3;
      Triangle triangle = Triangle(vertices[v1-1], vertices[v2-1], vertices[v3-1], vec3(0.8f, 0.8f, 0.8f));
      triangle.normal.x *= -1;
      triangle.normal.y *= -1;
      triangle.normal.z *= -1;
      triangles.push_back(triangle);
    }
  }

  return triangles;
}