bool loadOBJ(
    const char* path,
    std::vector < glm::vec3 >& out_vertices,
    std::vector < glm::vec2 >& out_uvs,
    std::vector < glm::vec3 >& out_normals
)
{
    std::vector< unsigned int > vertexIndices, uvIndices, normalIndices;
    std::vector< glm::vec3 > temp_vertices;
    std::vector< glm::vec2 > temp_uvs;
    std::vector< glm::vec3 > temp_normals;
    FILE* file = fopen("D:\\GrafikaKomputerowa\\GKPomocOlka\\Grass_block.obj","r");
    if (file == NULL) {
        printf("Impossible to open the file !\n");
        return false;
    }
    while (1) {

        char lineHeader[128];
        // read the first word of the line
        int res = fscanf(file, "%s", lineHeader);
        if (res == EOF)
            break; // EOF = End Of File. Quit the loop.

        // else : parse lineHeader
        if (strcmp(lineHeader, "v") == 0) {
            glm::vec3 vertex;
            fscanf(file, "%f %f %f\n", &vertex.x, &vertex.y, &vertex.z);
            temp_vertices.push_back(vertex);
        }
        else if (strcmp(lineHeader, "vt") == 0) {
            glm::vec2 uv;
            fscanf(file, "%f %f\n", &uv.x, &uv.y);
            temp_uvs.push_back(uv);
        }
        else if (strcmp(lineHeader, "vn") == 0) {
            glm::vec3 normal;
            fscanf(file, "%f %f %f\n", &normal.x, &normal.y, &normal.z);
            temp_normals.push_back(normal);
        }
        else if (strcmp(lineHeader, "f") == 0) {
            std::string vertex1, vertex2, vertex3;
            unsigned int vertexIndex[3], uvIndex[3], normalIndex[3];
            int matches = fscanf(file, "%d/%d/%d %d/%d/%d %d/%d/%d\n", &vertexIndex[0], &uvIndex[0], &normalIndex[0], &vertexIndex[1], &uvIndex[1], &normalIndex[1], &vertexIndex[2], &uvIndex[2], &normalIndex[2]);
            if (matches != 9) {
                printf("File can't be read by our simple parser : ( Try exporting with other options\n");
                return false;
            }
            vertexIndices.push_back(vertexIndex[0]);
            vertexIndices.push_back(vertexIndex[1]);
            vertexIndices.push_back(vertexIndex[2]);
            uvIndices.push_back(uvIndex[0]);
            uvIndices.push_back(uvIndex[1]);
            uvIndices.push_back(uvIndex[2]);
            normalIndices.push_back(normalIndex[0]);
            normalIndices.push_back(normalIndex[1]);
            normalIndices.push_back(normalIndex[2]);
        }
        // For each vertex of each triangle
        for (unsigned int i = 0; i < vertexIndices.size(); i++) {
            unsigned int vertexIndex = vertexIndices[i];
            glm::vec3 vertex = temp_vertices[vertexIndex - 1];
            out_vertices.push_back(vertex);
        }
    }
}