[JAVA3D] MIPmapping - feasible on tree texture mapping

[Lan Wu-Cavener]

Hi, all:

I was trying MIPmapping on my tree texture mapping, hoping that the JVM
will pickup the resolution for the tree rendering so that the scene will
display certain degree of depth. I know many of you have done the MIPmap on
the terrain. But I don't know this is feasible for tree objects. Now I am
stuck here, got a NullPointerException at Appearance.setTexture(texture),
see below error msg.

java.lang.NullPointerException
        at
javax.media.j3d.TextureRetained.checkSizes(TextureRetained.java:406)
        at javax.media.j3d.TextureRetained.setLive(TextureRetained.java:943)
        at
javax.media.j3d.AppearanceRetained.setTexture(AppearanceRetained.java
:166)
        at javax.media.j3d.Appearance.setTexture(Appearance.java:527)
        at TreeBranchGroup2D.treeTexureMapping(TreeBranchGroup2D.java:164)
        ... ...
where TreeBranchGroup2D is my code. The texure, appear were not null. All
the image files were loaded. I don't know how to trace down the error and
about to quit. If anyone knows that this is not the way to go, please point
it out. Thanks for any input!

Lan


The code I was using to setup the MIPmap is as follows>

      String textFile = System.getProperty( "user.dir"
)+"/images/"+"pine1024.png";
      TextureLoader loader = new NewTextureLoader(textFile);
      ImageComponent2D image = loader.getImage();
      imageWidth = image.getWidth();
      imageHeight = image.getHeight();

      Texture2D texture = new Texture2D(Texture.MULTI_LEVEL_MIPMAP,
Texture.RGBA,
                                        imageWidth, imageHeight);
      imageLevel = 0;
      texture.setImage(imageLevel, image);
      texture.setEnable(true);

   while (imageWidth > 1 || imageWidth > 1){
          imageLevel++;
          if (imageWidth > 1) imageWidth /= 2;
          if (imageHeight > 1) imageHeight /= 2;

        textFile = System.getProperty( "user.dir"
)+"/images/"+"pine"+imageWidth+".png";
           loader = new NewTextureLoader(textFile);
          image = loader.getImage();
          texture.setImage(imageLevel, image);
      }

      texture.setMagFilter(Texture.BASE_LEVEL_POINT);
      texture.setMinFilter(Texture.MULTI_LEVEL_POINT);

texture.setBoundaryModeS(Texture.CLAMP_TO_EDGE );
texture.setBoundaryModeT(Texture.CLAMP_TO_EDGE );    // get the texture
from the loader

   TextureAttributes texAttr = new TextureAttributes();
    texAttr.setTextureMode(TextureAttributes.REPLACE);

            for (int i=0; i<ConstRepository.TREE_SPECIES.length; i++)
            {
                if (texture ==null || appear[i]==null)
                System.out.println("null appear or texture");

                appear[i].setTexture(texture);
                RenderingAttributes renderAtt =
appear[i].getRenderingAttributes();
                renderAtt.setCapability(RenderingAttributes.ALLOW_IGNORE_VERTEX_COLORS_WRITE);

                renderAtt.setIgnoreVertexColors(true);

                appear[i].setTextureAttributes(texAttr);
                appear[i].setTransparencyAttributes(
                                   new
TransparencyAttributes(TransparencyAttributes.BLENDED, 0f));
        }



Lan Wu-Cavener
Dept. of Landscape Architecture

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