Hi!
I am a novice in graphics processing in general and jME in particular, but so far I really like your product. However, I'm stuck with a problem now and I hope somebody can help me.
I am trying to render a 3D scene in jME and then write out some parts of it to a PNG file. My problem comes with anti-aliasing. As long as my background colour is fully opaque it just works fine. But if I set a fully transparent background to the renderer I still don't end up with a transparent background in my PNG file. This is clear because Renderer.takeScreenShot(String filename) - which I am using - is setting the BufferedImage to TYPE_INT_RGB which doesn't support transparency:
IntBuffer buff = ByteBuffer.allocateDirect(width * height * 4).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer();
grabScreenContents(buff, 0, 0, width, height);
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Now, if I change this to TYPE_INT_ARGB then I get the transparency that I want, but I get lots of jaggies as well, which indicates a problem with anti-aliasing.
How can I get both a transparent background and nice, smooth edges? I have played around with quite some settings, but now I am running out of ideas.