Question

我开始学习lwjgl并遇到问题！我在做什么：

加载纹理
开始渲染周期
绘制矩形并应用纹理

检查键盘和鼠标事件以及旋转/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);
}

当我旋转并移动XY平面中的所有内容时，它可以完美地工作。但是当我尝试沿着Z轴移动时，整个矩形消失了。我做错了什么？

Answer 1

好的，在查看初始参数后，我自己找到了解决方案。

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

函数定义渲染，并且此框外的所有内容都不会被渲染。因此，在沿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);

并且有效。

z翻译后为什么LWJGL多边形会消失？

1 个答案: