transform - 为什么 LWJGL 多边形在 z 平移后消失？

Question

我已经开始学习 lwjgl 并且遇到了问题！我在做什么：

1. 加载纹理

2. 开始渲染周期

3. 绘制矩形并应用纹理

4. 检查键盘和鼠标事件并旋转/移动相机

   public static void main(String[] args) {
   try {
       Display.setDisplayMode(new DisplayMode(320, 200));
       Display.create();
   } catch (Exception e) {
       System.out.println(e);
   }
   
   Texture texture = null;
   try {
       texture = TextureLoader.getTexture("JPG", ResourceLoader.getResourceAsStream("basic.jpg"), true);
   } catch (Exception e) {
       System.out.println(e);
       return;
   }
   
   GL11.glMatrixMode(GL11.GL_PROJECTION);
   GL11.glLoadIdentity();
   GL11.glOrtho(0, 320, 0, 200, 1, -1);
   GL11.glMatrixMode(GL11.GL_MODELVIEW);
   
   while (!Display.isCloseRequested()) {
       GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
       Color.white.bind();
       texture.bind();
       GL11.glBegin(GL11.GL_QUAD_STRIP);
           GL11.glTexCoord2f(0, 0);
           GL11.glVertex3f(100, 100, 0);
           GL11.glTexCoord2f(0, 1);
           GL11.glVertex3f(100, 140, 0);
           GL11.glTexCoord2f(1, 1);
           GL11.glVertex3f(140, 140, 0);
           GL11.glTexCoord2f(1, 0);
           GL11.glVertex3f(140, 100, 0);
       GL11.glEnd();
   
       Display.update();
       processInput();
       try {
           //Thread.sleep(20);
       } catch (Exception e) {
           System.out.println(e);
       }
   }
   
   Display.destroy();
   
   }
   
   public static void processInput() {
   long delta = getDelta();
   long divider = 10000000;
   float camx = 0, camy = 0, camz = 0;
   float roll = 0;
   if (Keyboard.isKeyDown(Keyboard.KEY_W)) {
       camz += 1.0f * delta / divider;
   }
   if (Keyboard.isKeyDown(Keyboard.KEY_S)) {
       camz -= 1.0f * delta / divider;
   }
   if (Keyboard.isKeyDown(Keyboard.KEY_D)) {
       camx -= 1.0f * delta / divider;
   }
   if (Keyboard.isKeyDown(Keyboard.KEY_A)) {
       camx += 1.0f * delta / divider;
   }
   if (Keyboard.isKeyDown(Keyboard.KEY_SPACE)) {
       camy -= 1.0f * delta / divider;
   }
   if (Keyboard.isKeyDown(Keyboard.KEY_C)) {
       camy += 1.0f * delta / divider;
   }
   if (Mouse.isButtonDown(0)) {
       roll += 1.0f * delta / divider;
   }
   if (Mouse.isButtonDown(1)) {
       roll -= 1.0f * delta / divider;
   }
   GL11.glTranslatef(camx, camy, camz);
   GL11.glTranslatef(160, 100, 0);
   GL11.glRotatef(roll, 0, 0, 1);
   GL11.glTranslatef(-160, -100, 0);
   }
   

当我在 XY 平面上旋转和移动所有东西时，它工作得很好。但是当我尝试沿 Z 轴移动时，整个矩形消失了。我做错了什么？

Answer 1

好的，我在查看初始参数后自己得到了解决方案。这

GL11.glOrtho(0, 320, 0, 200, 1, -1);

函数定义了渲染，并且此框外的所有内容都不会被渲染。因此，沿 z 轴移动后，该项目消失。我将渲染框更改为

GL11.glOrtho(0, 320, 0, 200, 100, -100);

那行得通。