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Quellcode

  private void selection(){
     
    // The selection buffer
    IntBuffer selBuffer = BufferUtils.createIntBuffer(256);
    IntBuffer vpBuffer = BufferUtils.createIntBuffer(64);
    
    // The number of "hits" (objects within the pick area).
    int hits=0;

    // Get the viewport info
    GL11.glGetInteger(GL11.GL_VIEWPORT, vpBuffer);
            
    // Set the buffer that OpenGL uses for selection to our buffer
    GL11.glSelectBuffer(selBuffer);
          
    // Change to selection mode
    GL11.glRenderMode(GL11.GL_SELECT);
          
    // Initialize the name stack (used for identifying which object was selected)
    GL11.glInitNames();
    GL11.glPushName(0);
          
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glPushMatrix();
    GL11.glLoadIdentity();
          
    //  create 5x5 pixel picking region near cursor location 
    System.out.println("x: "+mouse_x + " y:" + (vpBuffer.get(3) - mouse_y));
    GLU.gluPickMatrix(mouse_x, (vpBuffer.get(3) - mouse_y), 1.0f, 1.0f, vpBuffer);
    GL11.glOrtho(0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
    
  //  loadEnvironment(GL11.GL_SELECT);
   
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glPopMatrix();
    GL11.glFlush();

    hits = GL11.glRenderMode(GL11.GL_RENDER);
    System.out.println("Number: " + hits);
    
  }

Quellcode

  private int createDL(){
    //Displayliste erstellen
    int sphereDL;
    // parameter = anzahl displaylisten
    sphereDL = GL11.glGenLists(1);
    GL11.glNewList(sphereDL, GL11.GL_COMPILE);
      //zeichne spheres
      nodes.draw(0.2f, 16, 16);
      
    GL11.glEndList();
    return (sphereDL);
  }

  // method draws all sphere objects on screen (
  private void loadEnvironment(int mode){
    //GL11.glInitNames();
    //GL11.glRenderMode(GL11.GL_SELECT);
    // Draw A Sphere With A Radius Of 1 And 32 Longitude And 32 Latitude Segments
    for(int i = 0; i < numSpheres; i++)
    {
    if (mode == GL11.GL_SELECT) GL11.glLoadName(i);
    GL11.glPushMatrix();
    //objekt auf namestack
    GL11.glPushName(i);
            xPos = randomFloat[i];
            yPos = randomFloat[i+1];
            zPos = randomFloat[i+2];
            GL11.glVertex3f(xPos,yPos,zPos);
            GL11.glTranslatef(xPos, yPos, zPos);
            //displayliste ausfuehren
            GL11.glCallList(DLsphere);
            GL11.glTranslatef(-xPos, -yPos, -zPos);
        GL11.glPopName();
        GL11.glPopMatrix();

         
    }
    GL11.glRenderMode(GL11.GL_RENDER);
    }