在OpenGL中使用Blender/SketchUp模型

#include <GL/glfw.h>
#include <GL/glad.h>
#include<iostream>
#include<vector>
#include <fstream>
#include <sstream>
#include<string>

using namespace std;

struct Vertex {
    GLfloat x, y, z;
};

struct Face {
    GLuint a, b, c;
};

void loadOBJ(const char* path, vector<Vertex>& vertices, vector<Face>& faces) {
    ifstream file(path);
    if (!file.is_open()) {
        cout << "Failed to open file: "<< path<< endl;
        return;
    }

    string line;
    while (getline(file, line)) {
        stringstream ss(line);
        string type;
        ss >> type;

        if (type == "v") {
            Vertex vertex;
            ss >> vertex.x >> vertex.y >> vertex.z;
            vertices.push_back(vertex);
        } else if (type == "f") {
            Face face;
            ss >> face.a >> face.b >> face.c;
            faces.push_back(face);
        }
    }

    file.close();
}

int main() {
    if (!glfwInit()) {
        cout << "Failed to initialize GLFW"<< endl;
        return -1;
    }

    GLFWwindow* window = glfwCreateWindow(800, 600, "OpenGL", NULL, NULL);
    if (!window) {
        cout << "Failed to create GLFW window"<< endl;
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);
    if (!gladLoadGL()) {
        cout << "Failed to initialize GLAD"<< endl;
        glfwTerminate();
        return -1;
    }

    vector<Vertex> vertices;
    vector<Face> faces;
    loadOBJ("model.obj", vertices, faces);

    while (!glfwWindowShouldClose(window)) {
        glClear(GL_COLOR_BUFFER_BIT);

        glBegin(GL_TRIANGLES);
        for (Face face : faces) {
            glVertex3f(vertices[face.a - 1].x, vertices[face.a - 1].y, vertices[face.a - 1].z);
            glVertex3f(vertices[face.b - 1].x, vertices[face.b - 1].y, vertices[face.b - 1].z);
            glVertex3f(vertices[face.c - 1].x, vertices[face.c - 1].y, vertices[face.c - 1].z);
        }
        glEnd();

        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}