blender导出模型，并且lwjgl加载

复制代码

import java.io.*;
import java.nio.file.*;
import java.util.*;

public class OBJLoader {
    public static class Vertex {
        public float x, y, z;    // Position
        public float u, v;       // Texture coordinates
        public float nx, ny, nz; // Normal

        public Vertex(float x, float y, float z, float u, float v, float nx, float ny, float nz) {
            this.x = x;
            this.y = y;
            this.z = z;
            this.u = u;
            this.v = v;
            this.nx = nx;
            this.ny = ny;
            this.nz = nz;
        }
    }

    public static class Model {
        public List<Vertex> vertices = new ArrayList<>();
        public List<Integer> indices = new ArrayList<>();
    }

    public static Model loadModel(String filePath) throws IOException {
        List<float[]> positions = new ArrayList<>();
        List<float[]> texCoords = new ArrayList<>();
        List<float[]> normals = new ArrayList<>();
        Model model = new Model();

        List<String> lines = Files.readAllLines(Paths.get(filePath));
        for (String line : lines) {
            String[] tokens = line.split("\\s+");
            switch (tokens[0]) {
                case "v":
                    positions.add(new float[]{
                            Float.parseFloat(tokens[1]),
                            Float.parseFloat(tokens[2]),
                            Float.parseFloat(tokens[3])});
                    break;
                case "vt":
                    texCoords.add(new float[]{
                            Float.parseFloat(tokens[1]),
                            Float.parseFloat(tokens[2])});
                    break;
                case "vn":
                    normals.add(new float[]{
                            Float.parseFloat(tokens[1]),
                            Float.parseFloat(tokens[2]),
                            Float.parseFloat(tokens[3])});
                    break;
                case "f":
                    for (int i = 1; i <= 3; i++) { // Assuming triangles
                        String[] parts = tokens[i].split("/");
                        int posIndex = Integer.parseInt(parts[0]) - 1;
                        int texIndex = Integer.parseInt(parts[1]) - 1;
                        int normIndex = Integer.parseInt(parts[2]) - 1;

                        float[] pos = positions.get(posIndex);
                        float[] tex = texCoords.get(texIndex);
                        float[] norm = normals.get(normIndex);

                        Vertex vertex = new Vertex(pos[0], pos[1], pos[2], tex[0], tex[1], norm[0], norm[1], norm[2]);
                        model.vertices.add(vertex);
                        model.indices.add(model.vertices.size() - 1);
                    }
                    break;
            }
        }
        return model;
    }
}

复制代码

import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.util.glu.GLU;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;

import java.io.File;
import java.io.IOException;
import java.nio.FloatBuffer;

import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL30.*;

public class Main_test_simple_scene {

    // 窗口大小
    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;

    // 阴影贴图的大小
    private static final int SHADOW_WIDTH = 1024;
    private static final int SHADOW_HEIGHT = 1024;

    // 帧缓冲对象和纹理对象
    private int fbo;
    private int shadowMapTexture;

    // 光源位置
    private float[] lightPosition = {0.0f, 10.0f, 0.0f, 1.0f};
    Texture earthTexture;

    public void start() throws Exception {
        try {
            Display.setDisplayMode(new DisplayMode(WIDTH, HEIGHT));
            Display.create();
        } catch (LWJGLException e) {
            e.printStackTrace();
            System.exit(0);
        }



        // Load texture data using your preferred library
        earthTexture = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("Project1/Assignment3/res/earthspace.png"));

        initGL();

        while (!Display.isCloseRequested()) {

            renderScene();
            Display.update();
            Display.sync(60);
        }

        Display.destroy();
    }

   

    private void initGL() {
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        GLU.gluPerspective(45.0f, (float) WIDTH / HEIGHT, 1.0f, 100.0f);
        glMatrixMode(GL_MODELVIEW);
        glEnable(GL_DEPTH_TEST);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glLight(GL_LIGHT0, GL_POSITION, asFloatBuffer(new float[]{0.0f, 10.0f, 0.0f, 1.0f}));
    }

    static int xRot = 0;
    private void renderScene() {
        xRot++;
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glLoadIdentity();
        GLU.gluLookAt(0.0f, 10.0f, 10.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);

        // 设置物体颜色
        glColor3f(1.0f, 1.0f, 0.0f);

        // 绘制球体
        glPushMatrix();
        glTranslatef(0.0f, 4.0f, 0.0f);


        // Sphere sp = new Sphere();
        // sp.draw(1.0f, 32, 32);

        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
        glEnable(GL_CULL_FACE); // 启用剔除
        glCullFace(GL_BACK); // 剔除背面

        // draw obj sphere exported from blender

        // 然后创建缓冲区并使用这些数据进行渲染
        glEnable(GL_TEXTURE_2D);
        glBindTexture(GL_TEXTURE_2D, earthTexture.getTextureID());
        try {
            glRotatef(xRot, 0, 1, 0);
            // glRotatef(30, 0, 0, 1);

            OBJLoader.Model model = OBJLoader.loadModel("C:\\Users\\adsfa\\Documents\\blender_textures\\earth.obj");

            glEnable(GL_TEXTURE_2D); // 如果模型使用纹理


            glBegin(GL_TRIANGLES); // 开始绘制三角形
            for (int index : model.indices) {
                OBJLoader.Vertex v = model.vertices.get(index);

                glTexCoord2f(v.u, 1.f-v.v); // 纹理坐标
                glNormal3f(v.nx, v.ny, v.nz); // 法线

                glVertex3f(v.x, v.y, v.z); // 顶点坐标
            }
            glEnd(); // 结束绘制
        } catch (IOException e) {
            e.printStackTrace();
        }


        glPopMatrix();

        // // 绘制地面
        glBegin(GL_QUADS);

        // glScalef(100, 1, 100);
        glNormal3f(0, 1, 1);
        glVertex3f(-5.0f, 0.0f, -5.0f);
        glVertex3f(-5.0f, 0.0f, 5.0f);
        glVertex3f(5.0f, 0.0f, 5.0f);
        glVertex3f(5.0f, 0.0f, -5.0f);
        glEnd();

    }

    private FloatBuffer asFloatBuffer(float[] values) {
        FloatBuffer buffer = BufferUtils.createFloatBuffer(values.length);
        buffer.put(values);
        buffer.flip();
        return buffer;
    }



    public static void main(String[] args) {
        Main_test_simple_scene example = new Main_test_simple_scene();
        try {
            example.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}