Re: [Nuke-python] Callback choice

[Frank Rueter]

why not use the beforeRender callback to only process things when they will be needed? On 25/01/14 09:33, Johannes Hezer wrote: Hi Jesse, thanks for the answer. Sorry my mail was a bit messy. I do call a python function in the write nodes file knob, with [python writeFunction.call()]. This gets called many times, a bit like the knobChanged callback... so I thought this is a bad thing. And we are having freezes with it too. Now, I changed it into a callback. the callback code looks like this: def writeNodeUpdates()     try:         write = nuke.toNode('Special Write')     except:         nuke.tprint('no special write found')     else:         output = nameGenerator()         write['file'].setValue(output) I was interested which callback I should use. 1.onScriptSave 2.autolabel 3.updateUI 4.knobChanged (suggested by you) I could tie it to knobChange too, but that puts me a bit where I started. It gets evaluated on every change... For the moment I put it on onScriptSave. As this is also quite logical, as one cannot render without saving first. And having ctrl+s as the "setter" is also nice.... Good to know you used the knobChanged callback for this. Thanks for the input Johannes Am 1/24/14 19:19 PM, schrieb Jesse Kretschmer: If I understand correctly, you added a knob changed callback and it slows nuke down. The knobChanged callbacks will get called very frequently in the UI. It's important that you filter the incoming knob changes and exit the function as soon as possible. Every time a node is move, the callback will get called. I just sketched up an example to prove this (http://pastebin.com/zpa2tXtA). Just by selecting a node and moving it a small bit, you can see my callback is run nine times in less than half a second. 10:10:11.499000: Constant1.selected 10:10:11.499000: Viewer1.selected 10:10:11.578000: Constant1.xpos 10:10:11.586000: Constant1.xpos 10:10:11.597000: Constant1.xpos 10:10:11.613000: Constant1.xpos 10:10:11.630000: Constant1.xpos 10:10:11.646000: Constant1.ypos 10:10:11.663000: Constant1.xpos The docs shot some good examples of testing the name() of the knob, and you should probably test the node.Class() to make sure you only run on "Write" nodes. http://docs.thefoundry.co.uk/nuke/70/pythondevguide/callbacks.html#knobchanged All that said, I've created write file knob filters in production and not had performance issues. Look back at your code and see if it could be more efficient. It would also be nice to see an example of your callback code if you want some help making it more efficient. Cheers, jesse _______________________________________________ Nuke-python mailing list Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python ____ ESET 8964 (20131025) ____ The message was checked by ESET Mail Security. -- STUDIO RAKETE GmbH Johannes Hezer, Compositing TD & Stereoscopic SV Schomburgstr. 120 D - 22767 Hamburg j.he...@studiorakete.de Tel:+49 (0)40 - 380 375 69 - 0 Fax:+49 (0)40 - 380 375 69 - 99 ------------------------------------------------------ Pflichtangaben laut Handelsgesetzbuch und GmbH-Gesetz: STUDIO RAKETE GmbH Schomburgstr. 120 D - 22767 Hamburg www.studiorakete.de / i...@studiorakete.de Geschaeftsfuehrer: Jana Bohl Die Gesellschaft ist eingetragen im Handelregister des Amtsgerichts Hamburg unter der Nummer HR B 95660 USt.-ID Nr.: DE 245787817 ____ ESET 8964 (20131025) ____ The message was checked by ESET Mail Security. _______________________________________________ Nuke-python mailing list Nuke-python@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python

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