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  Normal map from height map  (Read 2056 times)
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Offline darkprophet

Senior Member




Go Go Gadget Arms


« Posted 2006-11-26 14:43:44 »

Hey all,
Im trying to get a normal map from a heightmap through this calculation:

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public TextureImage filter( HeightMap map ) {
      TextureImage image = new TextureImage( map.getDimension(), map.getDimension(), ImageFormat.RGB, new int[] { map.getDimension()
            * map.getDimension() * 3 * 4 }, ByteBuffer.allocateDirect( map.getDimension() * map.getDimension() * 3 * 4 ).order( ByteOrder.nativeOrder() ));

      FloatBuffer buffer = image.getData().asFloatBuffer();

      for ( int i = 0; i < map.getDimension(); i++ ) {
         for ( int j = 0; j < map.getDimension(); j++ ) {
            Vec3f currentVertex = new Vec3f( i, map.getPixelWrap( i, j ), j );
            Vec3f pU = new Vec3f( i + 1, map.getPixelWrap( i + 1, j ), j );
            Vec3f pV = new Vec3f( i, map.getPixelWrap( i, j + 1 ), j + 1 );

            Vec3f dpU = Vec3f.subtract( currentVertex, pU ).negate();
            Vec3f dpV = Vec3f.subtract( currentVertex, pV );
           
            Vec3f normal = Vec3f.cross( dpU, dpV ).normalise();
            normal.multiply( 0.5f ).add( 0.5f );
           
            buffer.put( normal.x ).put( normal.y ).put( normal.z );
         }
      }
      buffer.rewind();

      return image;
   }


If I was to loop through the created buffer in a J2D application, I would get a greenish rectangle (indicating normals pointing upwards) which is what I expected. But if I was to use OpenGL...I get an entirely different image:



Any ideas on whats going on?

DP Smiley

Friends don't let friends make MMORPGs.

Blog | Volatile-Engine
Offline Riven
« League of Dukes »

JGO Overlord


Medals: 743
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2006-11-26 17:06:15 »

Here's my guess:

you're sending floats to an unsigned-byte texture!

(or not) Grin

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Offline darkprophet

Senior Member




Go Go Gadget Arms


« Reply #2 - Posted 2006-11-26 17:09:19 »

LOL! Your right...how stupid of me.

Thanks riven.

Friends don't let friends make MMORPGs.

Blog | Volatile-Engine
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