I haven’t done any profiling of this, but based on the way I believe the
knobChanged knob’s contents are executed, I would definitely expect
pre-registered callbacks to perform better. They do feel snappier (though this
is based solely on perception), especially when the callback code becomes
complex. See this thread for a similar discussion:
http://forums.thefoundry.co.uk/phpBB2/viewtopic.php?t=8265
-Nathan
From: Simon Björk
Sent: Monday, May 20, 2013 12:22 AM
To: Nuke Python discussion
Subject: Re: [Nuke-python] Two questions about callbacks and writing python
Are there any speed improvements in defining the knobChanged upon launch
compared to adding the code directly to the knob?
2013/5/17 Jacob Harris <jacob.har...@methodstudios.com>
We often define a global knobChanged callback on launch --
nuke.addKnobChanged(outsideModule.function, nodeClass="Group"). This of course
causes every Group node to trigger a callback BUT we'll hide a knob in the one
we're actually targeting and filter it outside of Nuke.
def nodeUpdate():
n = nuke.thisNode()
k = nuke.thisKnob()
if "SecretKnob" in n.knobs():
if k.name() == "myButton":
myFunction()
Doing this allows us to use Python buttons with no code inside. It's great
for keeping certain node classes consistent across shows.
On 05/16/2013 09:05 AM, Nathan Rusch wrote:
If you have a gizmo, I would go one step further and use the callback
registration mechanism instead of the 'knobChanged' knob. Also, if you’re
reading a file when the panel is shown, I would cache your results and some
indicator that the file has been read already. You can provide a 'refresh'
button if need be to manually re-read the file and re-cache the data.
-Nathan
From: Hugo Léveillé
Sent: Thursday, May 16, 2013 6:14 AM
To: Nuke Python discussion
Subject: Re: [Nuke-python] Two questions about callbacks and writing python
I find it easier to edit the code in a dedicated editor. And the gizmo will
update live when you save your code while developing. Much faster then
copy/pasting the code everytime in the Nuke script editor to set the value
again and again...
On Thu, May 16, 2013, at 3:18, Howard Jones wrote:
Is that the best way then? I always write into the knobChanged direct in
the node. Though via
s=''' script stuff '''
...['knobChanged'].setValue(s)
What's the advantage of keeping it external?
Howard
On 16 May 2013, at 02:03, Frank Rueter <fr...@beingfrank.info> wrote:
You probably want to run the code every time the gizmo's panel is
opened, so look into the knobChanged knob.
I'd write the python code in an external file and import then execute
it inside the knobChanged knob.
This might get you started:
http://pastebin.com/Ca9eMNUQ
On 11/05/13 06:36, thinkinmonkey wrote:
Hello everyone,
I wrote a very simple gizmo in Nuke and I'd love to refine it with
your help.
The gizmo simply reads an xml file where I stored some data, the user
can select a scene/shot from a pulldown choice and he will have the images
sequence of that scene/shot.
Everything works, but I'd want to know:
a) When the user create the gizmo from menu, he's forced to click a
button on gizmo in order to load the xml file, otherwise the gizmo is not able
to load the image sequence. I want the gizmo load the xml file automatically, I
tried the callbacks, the "on Create" function, but with no success. Could you
tell me how to do that?
b) Just to be sure, I put all python code in a python script button
knob: is that right to program? I mean, if I want to write python functions or
callbacks that control the entire gizmo, the only solution I have is to write
then in a button, but they are executed only when user clicks on it, isn't?
There's another way to create a new node/plugin?
Thanks in advance.
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--
Hugo Léveillé
TD Compositing, Vision Globale
hu...@fastmail.net
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