Hello,
I noticed that two of the bugs I once reported against the first beta
of Java 3D 1.3 are still present in the fcs version.
1) Use of TRANSPARENCY_SORT_GEOMETRY (a transparency sorting policy):
There are rendering artifacts with transparent objects if they are
switched off. This is demonstrated with the following test
program. This shows a triangle which, after 5 seconds, is replaced
with a translated one. You can see that the first triangle remains
visible although it should become completely invisible.
2) Use of USE_COORD_INDEX_ONLY in IndexedTriangleArrays with per
vertex colors present:
The vertex colors are ignored during rendering, that means you just
see a white object. I tried to demonstrate this with the test
program, too, but this bug seems only to be observable in more
complex scenes or with more complex geometries.
Regards,
Ingo
======================================================================
import javax.swing.JFrame;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.universe.*;
import java.util.Timer;
import java.util.TimerTask;
public class Test extends JFrame {
public Test() {
Canvas3D canvas = new Canvas3D(
SimpleUniverse.getPreferredConfiguration());
SimpleUniverse universe = new SimpleUniverse(canvas);
universe.addBranchGraph(createSceneGraph());
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);
getContentPane().add(canvas);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
}
public static void main(String[] args) {
Test frame = new Test();
frame.show();
}
private BranchGroup createSceneGraph() {
BranchGroup branch = new BranchGroup();
final Switch sg = new Switch(0);
sg.setCapability(Switch.ALLOW_SWITCH_WRITE);
branch.addChild(sg);
DirectionalLight light = new DirectionalLight();
light.setInfluencingBounds(new BoundingSphere(new Point3d(), 1000));
branch.addChild(light);
// Add a Background
Background background = new Background(new Color3f(1.0f, 1.0f, 1.0f));
background.setApplicationBounds(new BoundingSphere(new Point3d(),
1000));
branch.addChild(background);
Appearance app = new Appearance();
app.setMaterial(new Material());
app.setTransparencyAttributes(
new TransparencyAttributes(TransparencyAttributes.NICEST, 0.5f));
Transform3D t3d1 = new Transform3D();
t3d1.setTranslation(new Vector3f(-1.0f, 0.0f, 0.0f));
Transform3D t3d2 = new Transform3D();
t3d2.setTranslation(new Vector3f(1.0f, 0.0f, 0.0f));
TransformGroup t1 = new TransformGroup(t3d1);
TransformGroup t2 = new TransformGroup(t3d2);
t1.addChild(new Shape3D(createTriangleArray(), app));
t2.addChild(new Shape3D(createTriangleArray(), app));
sg.addChild(t1);
sg.addChild(t2);
new Timer().schedule(new TimerTask() {
public void run() {
sg.setWhichChild(1);
}
}, 5000l);
//branch.compile();
return branch;
}
private IndexedTriangleArray createTriangleArray() {
int vertexFormat = GeometryArray.COORDINATES | GeometryArray.NORMALS
| GeometryArray.COLOR_3 | GeometryArray.USE_COORD_INDEX_ONLY;
IndexedTriangleArray geom = new IndexedTriangleArray(
3, vertexFormat, 3);
geom.setCoordinates(0, new float[] {-1, 0, 0, 1, 0, 0, 0, 2, 0});
geom.setColors(0, new float[] {1, 0, 0, 0, 1, 0, 0, 0, 1});
geom.setNormals(0, new float[] {-0.6f, 0, 0.8f, 0.6f, 0, 0.8f, 0, 0.6f,
0.8f});
int[] indices = new int[] {0, 1, 2};
geom.setCoordinateIndices(0, indices);
//geom.setColorIndices(0, indices);
//geom.setNormalIndices(0, indices);
return geom;
}
}
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