[JAVA3D]

[ioly]

java3d-interest:

        I've downloaded the java3d-1_3-windows-i586-directx-sdk.exe     from
java.sun.com and had it installed in my win2000professional OS. It
seems to work well with my "j2sdk-1_4_1_01-windows-i586.exe". Also I
can run the java3d demo _HOME\demo\java3d\PickTest\PickTest.class
properly.
        Yet when I try to change the view mode of the javax.media.j3d.View
object using method View.setProjectionPolicy(View.PARALLEL_PROJECTION),
I found that it didn't show the effect as expected, with my customed
Transform3D object for the view branch, in another java3d program.
        Then I modified the "init()" method of the demo "PickTest.java" and
the problem appeared again--when setting the projection policy of View to
View.PARALLEL_PROJECTION, my customed Transform3D object takes no effect,
yet the Transform3D object work well for View.PERSPECTIVE_PROJECTION.

        Is there anything undone before I should set the projection policy?
I just want to move the view point a little more far from (0,0,0).

PickTest.java

original code:
...............
                u = new SimpleUniverse(c);

                // This will move the ViewPlatform back a bit so the
                // objects in the scene can be viewed.
                u.getViewingPlatform().setNominalViewingTransform();
.................



changed to:
.............
                u = new SimpleUniverse(c);

        double viewAngle = Math.PI * 0.1, viewDistance = 5;
        Transform3D normalViewTrans = new Transform3D();
        normalViewTrans.set(new Vector3f(0f,
                        (float)(Math.sin(viewAngle) * viewDistance),
                        (float)(Math.cos(viewAngle) * viewDistance)));
        Transform3D t = new Transform3D();
        t.rotX(-viewAngle);
        normalViewTrans.mul(t);

        u.getViewingPlatform().getViewPlatformTransform()
                                                                
.setTransform(normalViewTrans);
.......................

Recompile the PickTest.java and run it, then you will find two
complete different scene when you now click the different
"View Mode" radios. Only the "Perspective" mode workes properly.


Thanks and best regards,
ioly
[EMAIL PROTECTED]
2002-11-19

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