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  Plane Lighting problem (Solved)  (Read 800 times)
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Offline Joshua Waring
« Posted 2012-09-30 05:17:22 »

Recently I've moved into a more advance part of OpenGL which is lighting, but as what follows is an error which I keep hitting, which is more of a logical error because despite where i place the plane it's illumination is the same everywhere.

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import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;

public class window {
   public static void main(String[] args){
      try {
         Display.setDisplayMode(new DisplayMode(800, 800));
         Display.create();

         GL11.glMatrixMode(GL11.GL_PROJECTION);
         GL11.glLoadIdentity();
         GL11.glOrtho(0, 5, 0, 5, -10, 10);

         GL11.glMatrixMode(GL11.GL_MODELVIEW);
         GL11.glLoadIdentity();
         GL11.glEnable(GL11.GL_LIGHTING);
         GL11.glEnable(GL11.GL_LIGHT0);
         float light0Position[] = {3f, 3f, 2f, 1f};
         float light0Color[] =    {1f, 0f, 1f, 1f};
         float light0Ambient[] = {0.3f, 1f, 1f, 1f};

         ByteBuffer byteBuffer = ByteBuffer.allocateDirect(16);
         //GL11.glLightModel(GL11.GL_LIGHT_MODEL_AMBIENT, (FloatBuffer)byteBuffer.asFloatBuffer().put(light0Color).flip());
         GL11.glLight(GL11.GL_LIGHT0, GL11.GL_DIFFUSE, (FloatBuffer) byteBuffer.asFloatBuffer().put(light0Color).flip());
         GL11.glLight(GL11.GL_LIGHT0, GL11.GL_POSITION, (FloatBuffer) byteBuffer.asFloatBuffer().put(light0Position).flip());
         GL11.glLight(GL11.GL_LIGHT0, GL11.GL_AMBIENT, (FloatBuffer) byteBuffer.asFloatBuffer().put(light0Ambient).flip());

         GL11.glEnable(GL11.GL_NORMALIZE);
         while(!Display.isCloseRequested()){
            GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
            GL11.glLoadIdentity();
            GL11.glBegin(GL11.GL_QUADS);
            GL11.glNormal3f(0, 0, 1);
               GL11.glVertex3f(2, 2, -3);
               GL11.glVertex3f(4, 2, -3);
               GL11.glVertex3f(4, 4, -3);
               GL11.glVertex3f(2, 4, -3);
            GL11.glEnd();
            Display.update();
         }
         System.exit(1);

      } catch (LWJGLException e) {
         e.printStackTrace();
      }


   }
}

The world is big, so learn it in small bytes.
Offline Joshua Waring
« Reply #1 - Posted 2012-09-30 05:32:27 »

I've spent a while trying to find out what the problem was and as soon as I post this, It's set as GL11.GL_DIFFUSE not GL11.GL_SPECULAR

The world is big, so learn it in small bytes.
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