[vtk-developers] TestFixedPointRayCasterLinearCropped failure

[David Gobbi]

I haven't been able to find the old mailing list discussions about
this topic, but here is the original bug report that I made in 2011
when I noticed the failing regression test.  It gives instructions
that any developer can use to reproduce the bug.
http://www.vtk.org/Bug/view.php?id=12115

A more recent report from a user who saw the same bug.
http://www.vtk.org/Bug/view.php?id=13420

I've already fixed a few issues in this volume mapper related to
32-bit overflow, but this threading bug should probably get the
attention of someone who is more familiar with the code.

 - David


On Sun, Feb 24, 2013 at 10:34 AM, David Gobbi <david.gobbi at gmail.com> wrote:
> Bill,
>
> I can reproduce the failure on any computer by increasing the
> DefaultNumberOfThreads in the multithreader.
>
> Also, this is the "fixed point" mapper, it uses integer arithmetic.
> It should produce _identical_ results on all platforms.
>
> I'll see if I can dig up some of my earlier list postings on it.  I've
> spent many hours investigating this issue, both by myself and with
> other VTK users.
>
>  - David
>
> On Sun, Feb 24, 2013 at 9:57 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> David,
>>
>> What makes you think this is a threading issue? The failng error is pretty
>> low, <20 on all failing systems and the images look visually similar.
>> http://open.cdash.org/testDetails.php?test=178462199&build=2824975
>>
>> Bill
>>
>> --
>> Unpaid intern in BillsBasement at noware dot com