On Wed, 6 Sep 2000, Ben Arbel wrote:
>hi all
>
>im getting a strange exception (non congruent transform above viewPlatform)
>when setting a transform3d to a transformGroup did any one encounter it
>before ? i will be happy to supply extra explanations for what im doing
>before that exeption or send an exmple code if you think it can help you
>figure out whats going on.
>
Hi,
I've had some trouble with that, too.
The problem should be exactly what the error message says. The transform3d
you set is non-congruent, meaning that it does something you can't do with
any combination of rotation, translation and mirroring (scale of -1).
Unfortunately, there is a bug in J3D that classifies mirroring
transformations as non-congruent. So until next release,
you (and I) have to use only rotation and translation in transforms
above viewplatform (and also in transforms in View object, at least
in compatibility mode)
If you do lots of strange matrix calculations, it is possible that some
rounding error accumulates in your matrix and tweaks it enough to make
it non-rigid. But probably it's the bug.
-- Matti Hietaj�rvi
University of Oulu
Finland
+358 8 553 2811
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