我在 lwjgl 中的立方体无法正确渲染

Question

我按照this 问题的最佳答案提供的 OpenGL 教程找到了here，但我的立方体拒绝渲染正面和背面，所有其他面都渲染，金字塔也有同样的问题。以下是源代码：

public void render(){
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, Display.getDisplayMode().getWidth(), 0, Display.getDisplayMode().getHeight(), -1, 1);
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_STENCIL_BUFFER_BIT); //clear screen

    //Center square according to screen size
    GL11.glPushMatrix();
    if(Display.wasResized()){
        MX = 0; //MX is mouse X position
        MY = 0; //MY is mouse Y position
    }
    if((MX == 0 && MY ==0)){
        GL11.glTranslatef((Display.getWidth()/2), (Display.getHeight()/2), 0.0f);
    }else{
        GL11.glTranslatef(MX+50, MY+50, 0.0f);
    }
    GL11.glRotatef(angle, 0.0f,1.0f,0.5f); //Angle is the angle of the quads rotation
    GL11.glBegin(GL11.GL_QUADS);

    GL11.glColor3f(0.0f,1.0f,0.0f);
    GL11.glVertex3f(50.0f, 50f, -50f);
    GL11.glVertex3f(-50.0f, 50f, -50f);
    GL11.glVertex3f(-50.0f, 50f, 50f);
    GL11.glVertex3f(50.0f, 50f, 50f);

    GL11.glColor3f(0.0f,0.5f,0.0f);
    GL11.glVertex3f(50.0f, -50f, 50f);
    GL11.glVertex3f(-50.0f, -50f, 50f);
    GL11.glVertex3f(-50.0f, -50f, -50f);
    GL11.glVertex3f(50.0f, -50f, -50f);

    GL11.glColor3f(1.0f,0.0f,0.0f);
    GL11.glVertex3f(50.0f, 50f, 50f);
    GL11.glVertex3f(-50.0f, 50f, 50f);
    GL11.glVertex3f(-50.0f, -50f, 50f);
    GL11.glVertex3f(50.0f, -50f, 50f);

    GL11.glColor3f(1.0f,1.0f,0.0f);
    GL11.glVertex3f(50.0f, -50f, -50f);
    GL11.glVertex3f(-50.0f, -50f, -50f);
    GL11.glVertex3f(-50.0f, 50f, -50f);
    GL11.glVertex3f(50.0f, 50f, -50f);

    GL11.glColor3f(0.0f,0.0f,1.0f);
    GL11.glVertex3f(-50.0f, 50f, 50f);
    GL11.glVertex3f(-50.0f, 50f, -50f);
    GL11.glVertex3f(-50.0f, -50f, -50f);
    GL11.glVertex3f(-50.0f, -50f, 50f);

    GL11.glColor3f(1.0f,0.0f,1.0f);
    GL11.glVertex3f(50.0f, 50f, -50f);
    GL11.glVertex3f(50.0f, 50f, 50f);
    GL11.glVertex3f(50.0f, -50f, 50f);
    GL11.glVertex3f(50.0f, -50f, -50f);

    GL11.glEnd();
    GL11.glPopMatrix();
}

Answer 1

在我看来这是一个深度问题。立方体的前部与截锥体的前部分离，而后部被剪掉。

GL11.glOrtho(0, Display.getDisplayMode().getWidth(), 0, Display.getDisplayMode().getHeight(), -1, 1);

注意 1（最后一个参数），任何过去的东西都会被剪掉。

你看到的实际上是你的立方体的一部分，它真的被拉长了。