[vtkusers] python exceptions patch needed for vtk 5.6

Charl Botha c.p.botha at tudelft.nl
Fri May 28 18:43:37 EDT 2010

Dear Florian and David,

On 28 May 2010 21:07, Florian Bruckner <e0425375 at gmail.com> wrote:
> is there a reason why the patch was not merged into the official vtk release?
> i'm just wondering because that patch is fairly old and for me this seems to be a very good solution for a general problem.

The patch has a permanent home here:

Of course I think it's a good patch. :) It does the following:
1. Turns all VTK errors into Python exceptions.
2. Carefully releases the GIL during all calls into VTK (grabbing it
back for observers) so that you can successfully explicitly
multi-thread VTK pipelines from Python.
3. Tries to trap bad_alloc.

I've been working on this for years, but due to Windows unreachable
code warnings that I have not been able to solve, I've never committed
this to VTK (it works, just gives many warnings during compilation).
My own binaries all have this patch integrated (DeVIDE [1] and VTK

The current version is for 5.4.2, I'd like to update for 5.6 as soon
as I can figure out how to check out a clean 5.6 with git (until very
recently there was no tag yet, I see that it's there now!
http://vtk.org/gitweb?p=VTK.git;a=summary )

I'm also considering to make a wiki page on devide.googlecode.com that
documents the patch.

See you,

[1] http://graphics.tudelft.nl/Projects/DeVIDE
[2] http://cpbotha.net/software/latest-vtk-windows-binaries/

> On Fri, May 28, 2010 at 4:07 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>> Hi Florian,
>> I haven't seen mention of the patch here on the list, and I know
>> that it isn't in VTK 5.6 or in VTK devel.  For my own apps, I use
>> VTK observers to catch reader errors.
>>   David
>> On Fri, May 28, 2010 at 12:52 AM, Florian Bruckner <e0425375 at gmail.com> wrote:
>> > hi,
>> >
>> > I just figured out the problem that no python exceptions are raised if
>> > my reader produces an error. I use vtk-5.6.
>> >
>> > after searching the net and the mailing list I found that there are some
>> > patches available
>> > (turn-vtk-errors-into-python-exceptions-and-catch-bad-malloc patch)
>> > which should solve this problem. Unfortunately I could neither find such
>> > a patch for vtk-5.6 nor any actual posts about this topic.
>> >
>> > So should this patch allready be included in the new vtk-5.6? or where
>> > can I get it otherwise? are there any reasons why the patch is not
>> > included in the official release? or is there another work around that
>> > is proposed for this kind of problems?
>> >
>> > thanks
>> > FloB
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dr. charl p. botha :: http://graphics.tudelft.nl/CharlBotha
work: cpbotha at medvis.org personal: cpbotha at cpbotha.net

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