Re: [Openfx-developer] Openfx examples in Nuke, problems and fixes

[Bruno N. <br...@th...>]

What is happening is that Nuke is interrupting all process when you move a slider about. Which means you plugin gets interrupted. 

So if a plugin fetches an image and part way through that Nuke interrupts, then the fetch image will fail, because all upstream processing has halted. This is not a bug in Nuke, it is the way Nuke works. If you check the interruption status after a fetch, you will see that you will have been interrupted. 

Interruption is not an error state, you plugin has not gone wrong. In which case you should return OK.

b


On 21 Dec 2010, at 22:10, Pau Gargallo wrote:

> Fabien,
> 
> thanks for the answer and the pointer to your plug-ins, they will be
> very useful.
> 
> After catching the kOfxStatFailed when fetching the images the
> examples work fine. I'll send a patch with the changes I've made.
> 
> I'm using the last version of Nuke on a 64bits linux, but I've
> compulsively tried a bunch of versions from the Foundry's ftp, to see
> if the error happened only some of them. As it turned out, it was not
> a version problem but an oversight in the example.
> 
> cheers,
> pau
> 
> 
> 
> On Tue, Dec 21, 2010 at 5:10 PM,  <fab...@fr...> wrote:
>> Hi,
>> The default examples are not really great.
>> Effectively, nuke often returns an empty image (I don't know why) and you have to return an error. And nuke does the process again, with a good image...
>> We have created an open source project for openfx plugins and a library to batch a graph of openfx nodes. The project is still under early development, but you can found a bunch of plugin examples, simple or advanced ones.
>> https://github.com/tuttleofx/TuttleOFX/tree/master/plugins/image/process
>> There is no documentation, so if you have any question, don't hesitate to ask me.
>> To build see INSTALL.scons (the bjam version is no more used and so not up to date).
>> 
>> Regards,
>> Fabien Castan
>> 
>> PS: which version of nuke are you using ? There is many openfx bug fixes in nuke >= 6.0.
>> 
>> ----- Mail Original -----
>> De: "Pau Gargallo" <pau...@gm...>
>> À: ope...@li...
>> Envoyé: Mardi 21 Décembre 2010 13h01:37 GMT +01:00 Amsterdam / Berlin / Berne / Rome / Stockholm / Vienne
>> Objet: [Openfx-developer] Openfx examples in Nuke, problems and fixes
>> 
>> Hi all,
>> 
>> I'm new to OpenFX. I've downloaded the headers and examples, compiled
>> them and loaded them into Nuke without problems. The problems arrive
>> when I actually use the plug-in examples. They work properly as long
>> as you do not move the sliders too much. But as soon as you move a
>> slider (any of them) a bit to fast, Nuke crashes.  I've tried multiple
>> combinations of Nuke and OpenFX versions both on linux and mac, and
>> had always the same crash.
>> 
>> The problem seems to be that the render method in the examples does
>> not check the validity of the source image. The call
>> 
>>     gEffectHost->clipGetImage(myData->sourceClip, time, NULL, &sourceImg);
>> 
>> in line 667 of the basic.cpp example, is sporadically returning
>> kOfxStatFailed, but the return value is ignored.
>> 
>> What is the proper way to handle such failure?
>> Should the code in the examples be modified to handle this?
>> 
>> Thanks in advance,
>> pau
>> 
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Bruno Nicoletti, 
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