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Demonstration of arbitrary clipping planes E-mail
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In OpenGL, as in any graphics package, there exists a space inside which your data is displayed. This space is a cube, outside of which nothing is drawn. The front and back planes of this cube can be specified by the proper calls. These planes are called as clipping planes.

This example demonstrates arbitrary clipping planes. The example is ported from C examples in the OpenGL Programming Guide (known as the "red book").


Image

-> Copyright and Permission Notice

package glredbook10;

import java.awt.event.*;
import javax.swing.*;

import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*; 

/**
 * This program demonstrates arbitrary clipping planes.
 
 @author Kiet Le (Java conversion)
 */
public class clip
  extends JFrame
    implements GLEventListener, KeyListener
{
  private GLU glu;
  private GLUT glut;
  private GLCapabilities caps;
  private GLCanvas canvas;

  //
  public clip()
  {
    super("clip");
    //
    caps = new GLCapabilities();
    canvas = new GLCanvas(caps);
    canvas.addGLEventListener(this);
    canvas.addKeyListener(this);
    //
    getContentPane().add(canvas);
  }

  public void run()
  {
    setSize(500500);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
    canvas.requestFocusInWindow();
  }

  public static void main(String[] args)
  {
    new clip().run();
  }

  public void init(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    glu = new GLU();
    glut = new GLUT();
    //
    gl.glClearColor(0000);
    gl.glShadeModel(GL.GL_FLAT);
  }

  public void display(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    //  
    double eqn[] =
    0.01.00.00.0 };
    double eqn2[] =
    1.00.00.00.0 };

    gl.glClear(GL.GL_COLOR_BUFFER_BIT);

    gl.glColor3f(1.0f1.0f1.0f);
    gl.glPushMatrix();
    gl.glTranslatef(0.0f0.0f, -5.0f);

    /* clip lower half -- y < 0 */
    gl.glClipPlane(GL.GL_CLIP_PLANE0, eqn, 0);
    gl.glEnable(GL.GL_CLIP_PLANE0);
    /* clip left half -- x < 0 */
    gl.glClipPlane(GL.GL_CLIP_PLANE1, eqn2, 0);
    gl.glEnable(GL.GL_CLIP_PLANE1);

    gl.glRotatef(90.0f1.0f0.0f0.0f);
    glut.glutWireSphere(1.02016);
    gl.glPopMatrix();

    gl.glFlush();
  }

  public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
  {
    GL gl = drawable.getGL();
  
    gl.glViewport(00, w, h);
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();
    glu.gluPerspective(60.0(floatw / (floath, 1.020.0);
    gl.glMatrixMode(GL.GL_MODELVIEW);
  }

  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
      boolean deviceChanged)
  {
  }

  public void keyTyped(KeyEvent key)
  {
  }

  public void keyPressed(KeyEvent key)
  {

    switch (key.getKeyCode()) {
      case KeyEvent.VK_ESCAPE:
        System.exit(0);
        break;

      default:
        break;
    }
  }

  public void keyReleased(KeyEvent key)
  {
    // TODO Auto-generated method stub
  }
}

Source: Kiet Le's The Red Book Examples using JOGL


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