Hi folks,
one of the new features in j3d 1.3b1 to set what is called a
TransparencySortingPolicy. While this is fine in theory, I found a lot
of problems. Those may be specific to Linux in combination with
several graphics cards, but that is just a guess. I have tested this
with a Matrox G400 and a Geforce II.
The first and most serious problem is that an application hangs, when
a cylinder (maybe this occurs with other primitives, too) with
transparent appearance should be displayed. I have attached a test
programm to demonstrate that.
The second problem is that transparent objects, which don't cause a
crash, leave some artifacts on the screen (perhaps the same problem
Bob Gray described in a recent e-mail).
It's a pity, that this new feature, which should have solved some of
Java 3D's transparency problems is so completely unusable.
Regards,
Ingo
===File ~/TSPTest.java======================================
import java.awt.Font;
import javax.swing.JFrame;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.behaviors.mouse.*;
import com.sun.j3d.utils.geometry.Cylinder;
public class TSPTest extends JFrame {
public static void main(String[] args) {
TSPTest frame = new TSPTest();
Canvas3D canvas = new Canvas3D(
SimpleUniverse.getPreferredConfiguration());
SimpleUniverse universe = new SimpleUniverse(canvas);
universe.addBranchGraph(frame.createSceneGraph());
/*
If the following line is uncommented, the application hangs
(at least on some Linux configurations)
*/
//universe.getViewer().getView().setTransparencySortingPolicy(View.TRANSPARENCY_SORT_GEOMETRY);
Transform3D vpLocation = new Transform3D();
TransformGroup vptg = universe.getViewingPlatform(
).getViewPlatformTransform();
vptg.getTransform(vpLocation);
vpLocation.setTranslation(new Vector3d(0.0, 0.0, 8.0));
vptg.setTransform(vpLocation);
canvas.setSize(300, 300);
frame.getContentPane().add(canvas);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.show();
}
private BranchGroup createSceneGraph() {
BranchGroup branch = new BranchGroup();
TransformGroup tg = new TransformGroup();
tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
branch.addChild(tg);
MouseRotate myMouseRotate = new MouseRotate();
myMouseRotate.setTransformGroup(tg);
myMouseRotate.setSchedulingBounds(new BoundingSphere());
branch.addChild(myMouseRotate);
DirectionalLight light = new DirectionalLight();
light.setInfluencingBounds(new BoundingSphere());
branch.addChild(light);
Appearance appearance = new Appearance();
appearance.setTransparencyAttributes(
new TransparencyAttributes(
TransparencyAttributes.NICEST, 0.5f));
Cylinder cylinder = new Cylinder(1.0f, 2.0f, appearance);
tg.addChild(cylinder);
return branch;
}
}
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