Here is another transparency bug I could isolate with j3d 1.3b1. I
think it's a serious one and am sure it's independet of your
configuration.
Take the following test program. The left cylinder has a transparency
of 50 percent. But you cannot see that, unless you move the right
cylinder out of view. It looks right, if the two appearances of the
cylinders use different materials.
Regards,
Ingo
===File ~/TProbsTest.java===================================
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 TProbsTest extends JFrame {
public TProbsTest() {
Canvas3D canvas = new Canvas3D(
SimpleUniverse.getPreferredConfiguration());
SimpleUniverse universe = new SimpleUniverse(canvas);
universe.addBranchGraph(createSceneGraph());
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);
getContentPane().add(canvas);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
}
public static void main(String[] args) {
TProbsTest frame = new TProbsTest();
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);
MouseTranslate myMouseTranslate = new MouseTranslate();
myMouseTranslate.setTransformGroup(tg);
myMouseTranslate.setSchedulingBounds(new BoundingSphere());
branch.addChild(myMouseTranslate);
DirectionalLight light = new DirectionalLight();
light.setInfluencingBounds(new BoundingSphere(new Point3d(), 1000));
branch.addChild(light);
Appearance appearance1 = new Appearance();
appearance1.setTransparencyAttributes(
new TransparencyAttributes(
TransparencyAttributes.NICEST, 0.5f));
Material material = new Material();
appearance1.setMaterial(material);
Appearance appearance2 = new Appearance();
// If a new material is used, it looks right.
appearance2.setMaterial(material);
Cylinder cylinder1 = new Cylinder(1.0f, 2.0f, appearance1);
Cylinder cylinder2 = new Cylinder(1.0f, 2.0f, appearance2);
Transform3D t3d1 = new Transform3D();
t3d1.setTranslation(new Vector3f(-2.0f, 0.0f, 0.0f));
Transform3D t3d2 = new Transform3D();
t3d2.setTranslation(new Vector3f(2.0f, 0.0f, 0.0f));
TransformGroup tg1 = new TransformGroup(t3d1);
TransformGroup tg2 = new TransformGroup(t3d2);
tg1.addChild(cylinder1);
tg2.addChild(cylinder2);
tg.addChild(tg1);
tg.addChild(tg2);
return branch;
}
}
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