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Libgdx weird modelling - depth error?

I'm getting this when I load any .obj file with ObjLoader:
How it looks like in real:
How I'm loading it:
ModelInstance instance = new ModelInstance(model);
instance.transform.setToTranslation(-4, 0, 0);
instance.transform.mul(transform.setToRotation(Axis.X,(float)(Math.random()*360)));
Then in onCreate():
Gdx.gl.glClearDepthf(1.0f);
Gdx.gl.glEnable(GL20.GL_DEPTH_TEST);
Gdx.gl.glDepthFunc(GL20.GL_LESS);
Gdx.gl.glDepthRangef(0f, 1f);
Gdx.gl.glEnable(GL20.GL_TEXTURE_2D);
And in render():
Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
Gdx.gl.glClearColor(.1f, .1f, .1f, 1f);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);
shader.begin(camera, instances.get(i).transform);
modelBatch.begin(camera);
if (environment !=null) modelBatch.render(instances.get(i), environment, shader);
else modelBatch.render(instances.get(i), shader);
modelBatch.end();
shader.end();
Clean source code here:
source code
SOLUTION:
1, probleme was with the .mtl file, copy pasted from the ship.mtl and rewrite
2, probleme was with the camera near, and far plane (0.1 and 1000 is the good)
3, probleme was with the obj file texture, because it flipped on the obj file, solution was to convert g3db with -f

When using the libgdx 3D api (ModelBatch and/or Shader), you should not change the opengl state outside the Shader class. So, enabling/disabling depth test etc. is useless and might result in unpredicted behavior.
You should not use obj files. Instead use fbx-conv and use the g3db or g3dj file format. Also, your model is missing the mtl file, causing the material not to be applied.
You are using your own shader, you should not have to call shader.end(), modelbatch does this for you.
I tried your model (without material obviously) and it renders correctly using the default shader.

Looks more like you've some problems with your normals here. I don't think it's a problem of wrong depth. Depending on your modelling program e.g. blender3D, you could try to recalculate your facenormals and export it again!

You may follow these steps on 3D Studio Max:
Select all your design with CTRL+A (If you use Windows)
Press ALT+G to select Group category near Edit and Tools selection
Make your all work as a group
Try again on your Android application.
It should be done.

How to render a 3D alien imported from Blender?

I'm getting mixed results trying to render a basic alien that was done in Blender:
I export in to Ogre 3D and load it in Eclipse:
Then when I load it in my code and try to render it the material won't render:
Could you tell me what I must do to achieve the full alien in my scene? The code I use in Jmonkeyengine is
Spatial model3 = assetManager
.loadModel("objects/creatures/alien/alien.mesh.xml");
model3.scale(0.3f, 0.3f, 0.3f);
model3.setLocalTranslation(-40.0f, 3.5f, -20.0f);
rootNode.attachChild(model3);
Update
I've got material files like these from the export:
dev#dev-OptiPlex-745:~$ ls workspace/DungeonWorld2/assets/objects/creatures/alien/
alien.mesh Material.002.material Material.005.material
alien.mesh.xml Material.003.material
alien.skeleton.xml Material.004.material
dev#dev-OptiPlex-745:~$
This material code actually produces a material in the scene but it's not the one from blender:
model3.setMaterial( new Material(assetManager,
"Common/MatDefs/Misc/Unshaded.j3md") );
Result:
However, loading a 3D model of an alephant without defining the material does work:
Spatial elephant = (Spatial) assetManager.loadModel("Models/Elephant/Elephant.mesh.xml");
float scale = 0.05f;
elephant.scale(scale,scale,scale);
elephant.setLocalTranslation(-50.0f, 3.5f, -20.0f);
control = elephant.getControl(AnimControl.class);
control.addListener(this);
channel = control.createChannel();
for (String anim : control.getAnimationNames())
System.out.println("elephant can:"+anim);
The above code correctly renders the elephant so why can't I export a mesh like that for the alien? I tried to explcitly load the material but it's not working for me:
Spatial model3 = assetManager
.loadModel("objects/creatures/alien/alien.mesh.xml");
model3.scale(0.3f, 0.3f, 0.3f);
model3.setLocalTranslation(-40.0f, 3.5f, -20.0f);
model3.setMaterial( new Material(assetManager,
"objects/creatures/alien/alien.material") );
rootNode.attachChild(model3);
The above generates an exception and I don't really know what material file it is that I'm loading and what do to with the two or three other material files that the export generated:
java.lang.ClassCastException: com.jme3.material.MaterialList cannot be cast to com.jme3.material.MaterialDef
at com.jme3.material.Material.<init>(Material.java:116)
at adventure.Main.simpleInitApp(Main.java:309)
at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:225)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:129)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:205)
at java.lang.Thread.run(Thread.java:679)
Update
Loading other models this way is working:
BlenderKey blenderKey = new BlenderKey(
"objects/creatures/troll/troll.mesh.xml");
Spatial troll = (Spatial) assetManager.loadModel(blenderKey);
troll.setLocalTranslation(new Vector3f(-145, 15, -10));
rootNode.attachChild(troll);
BlenderKey blenderKey2 = new BlenderKey(
"objects/creatures/spaceman/man.mesh.xml");
Spatial man = (Spatial) assetManager.loadModel(blenderKey2);
man.setLocalTranslation(new Vector3f(-140, 15, -10));
rootNode.attachChild(man);
I get the models inside my game and they look alreight, both the troll and the spaceman that both originally were .blend files.
Now it's much better when I did it over and it is loading the material. The only problem with the alien left now is the holes in the head that was also answered here.
BlenderKey blenderKey = new BlenderKey(
"objects/creatures/alien/alien.mesh.xml");
Spatial alien = (Spatial) assetManager.loadModel(blenderKey);
alien.setLocalTranslation(new Vector3f(-145, 15, -10));
rootNode.attachChild(alien);

You didn't write anything about your material - did you write one and used it correctly? The problem you get seems to be the lack of material to me.
In general you'll need some *.material file and probably some textures (if you used them in Blender). For the beginning you can use one of the materials that come with Ogre, you'll just need to add:
model3.setMaterialName( "Examples/Rockwall" );
Then look if it changes anything. If you still get the problem you can look into 'Ogre.log' file - it's always worth checking because all the errors goes there.
I also see the second problem here - you render the object as 'one sided' while blender probably render is as two-sided mesh, so you get the holes on the head. You can select in the material to be two sided, but it's better (and faster during rendering) to just create your models without the holes :).

Encoding transparent animated gif in Java

I am using GifDecoder to read an animated .gif file and AnimGifEncoder to write it. (link)
If I display the original frames read by GifDecoder they display correctly and are transparent, but if I display the frames created by AnimatedGifEncoder the transparency is all wrong.
GifDecoder gif = new GifDecoder();
gif.read("image.gif");
AnimatedGifEncoder e = new AnimatedGifEncoder();
e.start("newimage.gif");
e.setTransparent(Color.BLACK);
for (int i=0;i<gif.getFrameCount();i++) {
anim.addFrame(gif.getFrame(i));
anim.setDelay(gif.getDelay(i));
}
anim.finish();
In this example I set the transparent color to black. But actually I want to get the transparent color information from the GifDecoder but I don't know how.

I'm using the following solution, although there are still some gif files that
are a mess after scaling... :
(At least it seems to get along with most non-transparent gifs)
Color transparentColor = null;
BufferedImage firstFrameImage = ImageIO.read([sourceFileHere]);
if (firstFrameImage.getColorModel() instanceof IndexColorModel) {
IndexColorModel cm = (IndexColorModel) firstFrameImage.getColorModel();
int transparentPixel = cm.getTransparentPixel();
transparentColor = new Color(cm.getRGB(transparentPixel), true);
}
e.setTransparent(transparentColor);

This was all a long time ago, but I did manage to get it working at the time. Without digging out the code again... I got it working by:
Scan the original image and set the transparent areas to a colour that does not exist inside the original image.
Set the transparent colour inside the AnimGifEncoder to the colour that was previously assigned to the transparent areas.

Median Filter a bi-level image with JAI

I'd like to apply a Median Filter to a bi-level image and output a bi-level image. The JAI median filter seems to output an RGB image, which I'm having trouble downconverting back to bi-level.
Currently I can't even get the image back into gray color-space, my code looks like this:
BufferedImage src; // contains a bi-level image
ParameterBlock pb = new ParameterBlock();
pb.addSource(src);
pb.add(MedianFilterDescriptor.MEDIAN_MASK_SQUARE);
pb.add(3);
RenderedOp result = JAI.create("MedianFilter", pb);
ParameterBlock pb2 = new ParameterBlock();
pb2.addSource(result);
pb2.add(new double[][]{{0.33, 0.34, 0.33, 0}});
RenderedOp grayResult = JAI.create("BandCombine", pb2);
BufferedImage foo = grayResult.getAsBufferedImage();
This code hangs on the grayResult line and appears not to return. I assume that I'll eventually need to call the "Binarize" operation in JAI.
Edit: Actually, the code appears to be stalling once I call getAsBufferedImage(), but returns nearly instantly when the second operation ("BandCombine") is removed.
Is there a better way to keep the Median Filtering in the source color domain? If not, how do I downconvert back to binary?

Unfortunately it seems like the BandCombine operation doesn't behave as expected here. The appropriate tactic for getting back to bilevel is to use a flavor of ColorConvertOp -- doing so enables use of the MedianFilter operation which will (again, unfortunately) always lead to an RGB image.

How to customize series fill in area chart via BIRT chart API?

I am trying to create a gradient fill for a series in an area chart that I am building through the BIRT chart API, but the book "Integrating and Extending BIRT" and the Interwebs seem curiously silent about how to get it to work. It seems no matter what I do, I always get a flat color from the default palette. I've tried using SeriesDefinition.getSeriesPalette().update(Gradient) and even creating my own Palette with the gradient fill in it and setting that on the SeriesDefinition, but to no avail. I've also noticed that if I do not perform a shift() on the Palette, even if it's shift(0), which the Javadocs claim will do nothing, I get NullPointerException when I try to generate the chart:
Caused by: java.lang.NullPointerException
at org.eclipse.birt.chart.render.Area.renderDataPoints(Area.java:521)
at org.eclipse.birt.chart.render.Line.renderSeries(Line.java:570)
at org.eclipse.birt.chart.render.AxesRenderer.renderPlot(AxesRenderer.java:2181)
at org.eclipse.birt.chart.render.AxesRenderer.render(AxesRenderer.java:314)
at org.eclipse.birt.chart.factory.Generator.render(Generator.java:1368)
... 108 more
Here's the latest (non-working) code that I've tried:
Gradient gradient = FillUtil.createDefaultGradient(BirtReportBuilder.COLOR_WHITE);
gradient.setStartColor(ColorDefinitionImpl.WHITE());
gradient.setEndColor(ColorDefinitionImpl.create(76, 116, 131));
gradient.setDirection(90);
SeriesDefinition sdY = SeriesDefinitionImpl.create();
sdY.getQuery().setDefinition("\"Quantity\"");
Palette pal = PaletteImpl.create(gradient);
pal.shift(0);
sdY.setSeriesPalette(pal);
sdY.getSeries().add(as1);
yAxisPrimary.getSeriesDefinitions().add(sdY);
So what's the magic incantation to get the BIRT charting API to use my Gradient as the area fill?

This code works for me, I get a ugly coloured serie...
sdY.getSeriesPalette().update(GradientImpl.create(ColorDefinitionImpl.create(255,255,255), ColorDefinitionImpl.create(200,0,0,150), 90, false));
Hope it will help you ;p