For "function runs on selected nodes" type utils, I've tried to follow
the the idiom of:
def make_blurs(nodes = None):
if nodes is None:
nodes = nuke.selectedNodes()
created_nodes = []
for n in nodes:
new = nuke.nodes.Blur(inputs = [n]) # or something more useful
# ...
created_nodes.append(n)
return created_nodes
That allows functions to be chained together nicely, since you can do
something like:
starting = nuke.selectedNodes()
blurs = make_blurs(starting)
grades = make_grades(blurs)
The reason to do "nodes=None" is because..
def func(nodes = nuke.selectedNodes()):
pass
..won't do what you expect - the selectedNodes function gets called a
function-definition time (so probably when Nuke starts up), it's the
same as doing:
default_value = nuke.selectedNodes()
def func(nodes = default_value):
pass
There's a similar, but subtler issue with having mutable objects (like a
list or dict) as default argument:
http://stackoverflow.com/questions/1132941/least-astonishment-in-python-the-mutable-default-argument
Basically having anything other than simple numbers, or True/False as a
default argument value is usually.. "suspicious"
On 18/10/11 05:44, Diogo Girondi wrote:
> Ooops! Howard is right!
>
> You need to feed nuke.selectedNode() or a node object to it. I did that
> to allow people to use that function from elsewhere while passing node
> objects from loops and whatnots and not just based on the node selection.
>
> Sorry.
>
> Cheers,
> Diogo
>
> On 17/10/2011, at 14:21, Howard Jones <[email protected]
> <mailto:[email protected]>> wrote:
>
>> Hi
>> Yes works well - I modified it so it had nuke.selectedNode() fed into
>> it it.
>> See below though no doubt the formatting may have screwed.
>>
>>
>> Howard
>>
>>
>> ### Splits each and every layer on their own pipes using
>> ### shuffle nodes.
>> ### ------------------------------------------
>> ### splitLayers.py
>> ### v1.0 - Last modified: 07/08/2009
>> ### Written by Diogo Girondi
>> ### [email protected] <mailto:[email protected]>
>>
>> import nuke
>>
>> def splitLayers( node=nuke.selectedNode() ):
>>
>> '''
>> Splits each and every layer from the selected node into their own
>> pipes
>> '''
>>
>> ch = node.channels()
>>
>> layers = []
>> valid_channels = ['red', 'green', 'blue', 'alpha', 'black', 'white']
>>
>> for each in ch:
>> layer_name = each.split( '.' )[0]
>> tmp = []
>> for channel in ch:
>> if channel.startswith( layer_name ) == True:
>> tmp.append( channel )
>> if len( tmp ) < 4:
>> for i in range( 4 - len( tmp ) ):
>> tmp.append( layer_name + ".white" )
>> if tmp not in layers:
>> layers.append( tmp )
>>
>> for each in layers:
>> layer = each[0].split( '.' )[0]
>> ch1 = each[0].split( '.' )[1]
>> ch2 = each[1].split( '.' )[1]
>> ch3 = each[2].split( '.' )[1]
>> ch4 = each[3].split( '.' )[1]
>>
>> if ch1 not in valid_channels:
>> ch1 = "red red"
>> else:
>> ch1 = '%s %s' % ( ch1, ch1 )
>>
>> if ch2 not in valid_channels:
>> ch2 = "green green"
>> else:
>> ch2 = '%s %s' % ( ch2, ch2 )
>>
>> if ch3 not in valid_channels:
>> ch3 = "blue blue"
>> else:
>> ch3 = '%s %s' % ( ch3, ch3 )
>>
>> if ch4 not in valid_channels:
>> ch4 = "alpha alpha"
>> else:
>> ch4 = '%s %s' % ( ch4, ch4 )
>>
>> prefs = "in %s %s %s %s %s" % (layer, ch1, ch2, ch3, ch4)
>> shuffle = nuke.createNode( 'Shuffle', prefs, inpanel=False )
>> shuffle.knob( 'label' ).setValue( layer )
>> shuffle.setInput( 0, node )
>>
>>
>> ------------------------------------------------------------------------
>> *From:* JKehler <[email protected]
>> <mailto:[email protected]>>
>> *To:* Nuke user discussion <[email protected]
>> <mailto:[email protected]>>
>> *Sent:* Monday, 17 October 2011, 17:26
>> *Subject:* [Nuke-users] Diogo's splitLayers.py script
>>
>> Hey.
>>
>> Just wondering if anyone has had any luck using the splitLayers.py
>> script.?(Diogo maybe)
>> I tried running it on an .exr file but nothing happened.
>>
>> Thanks for the feedback.
>>
>> JK
>> _______________________________________________
>> Nuke-users mailing list
>> [email protected]
>> <mailto:[email protected]>,
>> http://forums.thefoundry.co.uk/
>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>
>>
>> _______________________________________________
>> Nuke-users mailing list
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>> <mailto:[email protected]>,
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>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>
>
> _______________________________________________
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--
ben dickson
2D TD | [email protected]
rising sun pictures | www.rsp.com.au
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