Hi Wei,
> I used Transform3D.frustum(...) object for transformation. The
TransformGroup node is used as an ancestor of a ViewPlatform node in the
SimpleUniverse. When I run the application, there is a
BadTransformException: TransformGroup: no-affine transform. Can anyone show
me how to make this transform affine?
Some time ago we discovered a similar problem with Transform3D.ortho(..). I
think this problem is fixed in newer J3D versions, but I am not sure about
this, since there is an easy bug fix (please tell me if it works with
frustum):
[26.11.99] ... included is some code which shows our problem: a Transform3D
set
with the ortho(..) function is not affine, but after reset with (nearly) the
same values with the set(..) function it seems to be okay.
code:
TransformGroup tg = new TransformGroup();
Transform3D t3d = new Transform3D();
float[] m = new float[16];
t3d.ortho(0.0, 10.0, 0.0, 10.0, -1.0, 1.0);
System.out.println(t3d.getBestType());
System.out.println(t3d);
try {
tg.setTransform(t3d);
}
catch(Exception e) {
System.out.println(e.getMessage()+"\n");
}
t3d.get(m);
t3d.set(m);
System.out.println(t3d.getBestType());
System.out.println(t3d);
try {
tg.setTransform(t3d);
}
catch(Exception e) {
System.out.println(e.getMessage()+"\n");
}
output:
0
0.2, 0.0, 0.0, -1.0
0.0, 0.2, 0.0, -1.0
0.0, 0.0, 1.0, 0.0
0.0, 0.0, 0.0, 1.0
TransformGroup: non-affine transform
128
0.20000000298023224, 0.0, 0.0, -1.0
0.0, 0.20000000298023224, 0.0, -1.0
0.0, 0.0, 1.0, 0.0
0.0, 0.0, 0.0, 1.0
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