Hi Josh,
Bug 4430366 is submit for this. Looks like the
optimization for invert() in congruent case
is not numerically stable.
Thanks.
- Kelvin
-------------
Java 3D Team
Sun Microsystems Inc.
>Date: Mon, 26 Mar 2001 20:13:22 -0500
>From: "Josh Richmond" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Cc: <[EMAIL PROTECTED]>
>Subject: Re: [JAVA3D] BadTransform bug in j3d1.2?
>Mime-Version: 1.0
>
>I've attached two files. Run the app named BugViewer and rotate the view a
little bit (hold the left mouse button down).
>
>The code affected is in ViewNavigator::orbit().
>
>Thanks for any help you can provide. If this is a bug sorry I wasn't able to
report it until after Beta 2 was finished.
>
>josh
>
>----------------------------------------------------
>Joshua L. Richmond, BASc, MSc.
>Systems Engineering (R&D)
>
>MD Robotics
>9445 Airport Rd, Brampton, ON, Canada
>(905) 790-2800 x4332
>-----------------------------------------------------
>
>>>> Kelvin Chung <[EMAIL PROTECTED]> 03/26/01 05:07PM >>>
>Hi Josh,
>
> Please give us a test program for investigation.
>It is most likely cause by numerical imprecision which
>accumulate over time big enough to make the transformation
>matrix not congruent. Try to use double instead of float
>to see if things get improves.
>
>It happen since v1.2.1 beta2 because Transform3D is
>enchanced to optimize for several matrix inversion cases
>and also in other case when the matrix is congruent.
>
>Thanks.
>
>- Kelvin
>----------------
>Java 3D Team
>Sun Microsystems Inc.
>
>>Mime-Version: 1.0
>>Date: Mon, 26 Mar 2001 16:46:33 -0500
>>From: Josh Richmond <[EMAIL PROTECTED]>
>>Subject: [JAVA3D] BadTransform bug in j3d1.2?
>>To: [EMAIL PROTECTED]
>>
>>This is a poor excuse for a bug report because I'm not at a computer where I
>can run my code, nor do I have sample code (yet), but I thought I'd see if
>anyone else has witnessed this.
>>
>>I'm using a slight variation of Eric's orbit behaviours. In version 1.2beta1,
>it works like a charm. In the release version of 1.2 I get a
>BadTransformException during rotations. This is very consistent and
>reproducible.
>>
>>I plan on using the j3dutil Orbit behaviour, but thought I'd bring this up as
>it might point to a bigger problem.
>>
>>Sample code can be made available.
>>
>>josh
>>
>>----------------------------------------------------
>>Joshua L. Richmond, BASc, MSc.
>>Systems Engineering (R&D)
>>
>>MD Robotics
>>9445 Airport Rd, Brampton, ON, Canada
>>(905) 790-2800 x4332
>>-----------------------------------------------------
>>
>
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