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  A dazed image rendering  (Read 1469 times)
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Offline Grinvon

Senior Newbie





« Posted 2005-10-07 19:49:44 »

I have create a simple start exemple, folling some code of source tutorial, Start well, but create a confez image, distorced like below...



What can I do to fix it?

Thanks all!
Offline anarchotron

Junior Member




...precious bodily fluids.


« Reply #1 - Posted 2005-10-07 19:56:31 »

Please post source code.

It looks like you might not be clearing your color and depth buffers.

JW
Offline Grinvon

Senior Newbie





« Reply #2 - Posted 2005-10-07 19:58:47 »

Thanks anarcotron, The code follows below...

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package org.gldemos;

import org.lwjgl.LWJGLException;
import org.lwjgl.Sys;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;

/**
 * @author inocencio
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

public class init {
   
   private DisplayMode chosenModel = null;
   private boolean running = true;
   
   int width = 800;
   int height = 600;
   
   init() {
     
      try {
         
         DisplayMode[] modes = Display.getAvailableDisplayModes();
         
         for (int i=0; i < modes.length; i++) {
           
            if ((modes[i].getWidth() == width) && (modes[i].getHeight() == height)) {
               chosenModel = modes[i];
               break;
            }
         }
         
      }   catch(LWJGLException ex) {
         Sys.alert("Error", "Unable to determine display mode");
         System.exit(0);
         
      }
     
      if (chosenModel == null) {
         Sys.alert("Error","Unable to find display mode");
         System.exit(0);
      }
     
      try {
         Display.setDisplayMode(chosenModel);
         Display.setTitle("Example 01");
         Display.create();
      }   catch(LWJGLException ex) {
         Sys.alert("Error","Unable to create display");
         System.exit(0);
      }
     
      //seta um background
     GL11.glClearColor(0,0,0,0);
     
      runningGame();
         
   }
   
   public void runningGame() {
     
      float pos = 0.0f;
     
      //renderiza usando OpenGL
     
      while(running) {
         
         pos += 0.01f;
         GL11.glBegin(GL11.GL_QUADS);
             GL11.glVertex3f(0,0,pos);
             GL11.glVertex3f(1,0,pos);
             GL11.glVertex3f(1,1,pos);
             GL11.glVertex3f(0,1,pos);
           GL11.glEnd();

           Display.update();
           
           if (Display.isCloseRequested())
              running = false;
      }
     
      Display.destroy();
      System.exit(0);
   }

   public static void main(String[] args) {
     
      new init();
   }
}
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Offline anarchotron

Junior Member




...precious bodily fluids.


« Reply #3 - Posted 2005-10-07 20:03:12 »

Yes you need to call GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT) prior to your rendering.
Offline Grinvon

Senior Newbie





« Reply #4 - Posted 2005-10-07 20:12:05 »

I have put the line that you show me into main loop

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      while(running) {
         GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);

         pos += 0.01f;
         GL11.glBegin(GL11.GL_QUADS);
             GL11.glVertex3f(0,0,pos);
             GL11.glVertex3f(1,0,pos);
             GL11.glVertex3f(1,1,pos);
             GL11.glVertex3f(0,1,pos);
           GL11.glEnd();

           Display.update();
           
           if (Display.isCloseRequested())
              running = false;
           
           if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE))
              running = false;
      }


The screen start and continues in full black. Vertex3f can render a Square or Triangle?
Offline anarchotron

Junior Member




...precious bodily fluids.


« Reply #5 - Posted 2005-10-07 20:19:16 »

Also in your code you never setup the projection matrix.  This very same problem was discussed here:

http://192.18.37.44/forums/index.php?topic=10965.0

Online Riven
« League of Dukes »

JGO Overlord


Medals: 753
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #6 - Posted 2005-10-07 20:22:07 »

Last but not least you never define the color..

You need the RedBook, shouldn't be hard to find with Google.

Hi, appreciate more people! Σ ♥ = ¾
Learn how to award medals... and work your way up the social rankings
Offline Grinvon

Senior Newbie





« Reply #7 - Posted 2005-10-07 20:25:14 »

Thanks all. I will checkout the "RedBook", its the real title?

Offline anarchotron

Junior Member




...precious bodily fluids.


« Reply #8 - Posted 2005-10-07 20:26:05 »

Red Book:

http://www.opengl.org/documentation/red_book_1.0/
Offline Grinvon

Senior Newbie





« Reply #9 - Posted 2005-10-07 20:29:16 »


thaks for support me anarchotron! =D
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