我正在尝试创建一个多维数据集，因为这是在OpenGl 2.9中要做的事情。但是，我最初有一个立方体渲染，但我试图让我的设计好一点，但我现在无法看到我的立方体。帮我看看我的立方体。代码如下。我没有收到任何错误，只是无法看到我的立方体。
import java.awt.*;
import org.lwjgl.*;
import javax.swing.*;
public class Scene
{
private static boolean run = false;
private static int width = 640;
private static int height = 480;
long lastFrame; //time at last frame
int fps;
long lastFPS;
/** position of quad */
float x = 1, y = 1, z = 1; //400,300,400
/** angle of quad rotation */
float rotation = 0;
public void start()
{
try
{
Display.setDisplayMode(new DisplayMode(width, height));
Display.create();
} catch (LWJGLException e)
{
e.printStackTrace();
System.exit(0);
}
initGL(); // init OpenGL
getDelta(); // call once before loop to initialise lastFrame
lastFPS = getTime(); // call before loop to initialise fps timer
while (run == true)
{
int delta = getDelta();
update(delta);
renderGL();
Display.update();
Display.sync(60); // cap fps to 60fps
if (Keyboard.isKeyDown(Keyboard.KEY_Q))
{
break;
}
}
Display.destroy();
System.exit(0);
}
public void update(int delta) {
// rotate quad
rotation += 0.15f * delta;
if (Keyboard.isKeyDown(Keyboard.KEY_LEFT)) x -= 0.35f * delta;
if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) x += 0.35f * delta;
if (Keyboard.isKeyDown(Keyboard.KEY_UP)) y -= 0.35f * delta;
if (Keyboard.isKeyDown(Keyboard.KEY_DOWN)) y += 0.35f * delta;
// keep quad on the screen
if (x < 0) x = 0;
if (x > 800) x = 800;
if (y < 0) y = 0;
if (y > 600) y = 600;
updateFPS(); // update FPS Counter
}
public void renderGL() {
// Clear The Screen And The Depth Buffer
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
GL11.glColor3f(1, 0, 0);
// draw quad
GL11.glPushMatrix();
GL11.glTranslatef(x, y, z);
GL11.glRotatef(rotation, 0f, 0f, 1f);
GL11.glTranslatef(-x, -y, z);
GL11.glBegin(GL11.GL_QUADS);
GL11.glColor3f(0.0f,1.0f,0.0f); // Set The Color To Green
GL11.glVertex3f( x, y,-z); // Top Right Of The Quad (Top)
GL11.glVertex3f(-x, y,-z); // Top Left Of The Quad (Top)
GL11.glVertex3f(-x, y, z); // Bottom Left Of The Quad (Top)
GL11.glVertex3f( x, y, z); // Bottom Right Of The Quad (Top)
GL11.glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange
GL11.glVertex3f( x, -y, z); // Top Right Of The Quad (Bottom)
GL11.glVertex3f(-x, -y, z); // Top Left Of The Quad (Bottom)
GL11.glVertex3f(-x, -y,-z); // Bottom Left Of The Quad (Bottom)
GL11.glVertex3f( x,-y,-z); // Bottom Right Of The Quad (Bottom)
GL11.glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red
GL11.glVertex3f( x, y, z); // Top Right Of The Quad (Front)
GL11.glVertex3f(-x, y, z); // Top Left Of The Quad (Front)
GL11.glVertex3f(-x,-y, z); // Bottom Left Of The Quad (Front)
GL11.glVertex3f( x,-y, z); // Bottom Right Of The Quad (Front)
GL11.glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow
GL11.glVertex3f( x,-y,-z); // Bottom Left Of The Quad (Back)
GL11.glVertex3f(-x,-y,-z); // Bottom Right Of The Quad (Back)
GL11.glVertex3f(-x, y,-z); // Top Right Of The Quad (Back)
GL11.glVertex3f( x, y,-z); // Top Left Of The Quad (Back)
GL11.glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue
GL11.glVertex3f(-x, y, z); // Top Right Of The Quad (Left)
GL11.glVertex3f(-x, y,-z); // Top Left Of The Quad (Left)
GL11.glVertex3f(-x,-y,-z); // Bottom Left Of The Quad (Left)
GL11.glVertex3f(-x,-y, z); // Bottom Right Of The Quad (Left)
GL11.glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet
GL11.glVertex3f( x, y,-z); // Top Right Of The Quad (Right)
GL11.glVertex3f( x, y, z); // Top Left Of The Quad (Right)
GL11.glVertex3f( x,-y, z); // Bottom Left Of The Quad (Right)
GL11.glVertex3f( x,-y,-z); // Bottom Right Of The Quad (Right)
// GL11.glVertex2f(x - 50, y - 50);
// GL11.glVertex2f(x + 50, y - 50);
// GL11.glVertex2f(x + 50, y + 50);
// GL11.glVertex2f(x - 50, y + 50);
GL11.glEnd();
GL11.glPopMatrix();
}
/**
* Calculate how many milliseconds have passed
* since last frame.
*
* @return milliseconds passed since last frame
*/
public int getDelta() {
long time = getTime();
int delta = (int) (time - lastFrame);
lastFrame = time;
return delta;
}
/**
* Calculate the FPS and set it in the title bar
*/
public void updateFPS() {
if (getTime() - lastFPS > 1000) {
Display.setTitle("FPS: " + fps);
fps = 0;
lastFPS += 1000;
}
fps++;
}
/**
* Get the accurate system time
*
* @return The system time in milliseconds
*/
public long getTime() {
return (Sys.getTime() * 1000) / Sys.getTimerResolution();
}
public void initGL() {
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 800, 0, 600, 1, -1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
}
public static void main(String[] Args)
{
final JFrame info = new JFrame();
JButton button = new JButton();
JLabel infoText1 = new JLabel();
JLabel infoText2 = new JLabel();
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
button.setText("Acknowledge");
button.setSize(20, 10);
infoText1.setText("Press Q to quit");
infoText2.setText("Click Acknowledge to start simulation");
info.setTitle("Operator's Manual");
info.setLayout(new FlowLayout());
info.add(infoText1);
info.add(infoText2);
info.setSize(240, 120);
info.setLocation(dim.width/2-info.getSize().width/2, dim.height/2-info.getSize().height/2);
info.add(button);
info.setVisible(true);
button.addActionListener(new java.awt.event.ActionListener()
{
@Override
public void actionPerformed(java.awt.event.ActionEvent acknowledge)
{
run = true;
Scene sceneStart = new Scene();
sceneStart.start();
}
});
}
}
答案 0 :(得分：0)
编辑：glOrtho的近似值和远值都是向后的。请注意，您之后的7个z单位的平移也会将您的对象移动到glOrtho定义的体积之外，这将导致它不被绘制。
您正在模型视图矩阵中撤消自己的翻译。
GL11.glTranslatef(1.5f, 0.0f, -7.0f);
GL11.glLoadIdentity(); // << reloads identity matrix, overriding the translate.
正确的是：
// Ensure model view matrix is starting is nice fresh state.
GL11.glLoadIdentity();
// Put the quad where you want it.
GL11.glTranslatef(1.5f, 0.0f, -7.0f);