some Nuke Python snippets

Seeing as I’ve found very little reference for the use of python in nuke on the web I thought I’d create this post and add to it with little code snippets.

If anyone has some cool snippets to share please feel free to leave them in a comment below.

disable “postage stamps” on only “Read” nodes

for a in nuke.allNodes():
   if a.Class()=='Read':
       a['postage_stamp'].setValue(0)

disable “postage stamps” on all nodes

for a in nuke.allNodes():
    try:
        a['postage_stamp'].setValue(0)
    except:
        pass

“unhide” all nodes’ inputs – useful when receiving a sneaky comp/lighting script

for a in nuke.allNodes():
    try:
        a['hide_input'].setValue(0)
    except:
        pass

change the “first” frame of all selected nodes that are “Read” nodes:
(example changes the first frame to 1018)

for a in nuke.selectedNodes():
    if a.Class() == 'Read':
        a['first'].setValue(1018)

print a selected nodes’ methods

import struct
node = nuke.selectedNode()
for a in node['lookup'].animations():
    print dir(a)

print inputs (dependencies) of a selected node:

for a in nuke.selectedNode().dependencies():
    print a.name()

print outputs (dependents) of a selected node:

for a in nuke.selectedNode().dependent():
    print a.name()

find all the TimeOffset nodes in a Group called “Group2″, and change the value of each offset based on it’s position in the array of found time offsets

tos = []
for a in nuke.toNode('Group2').nodes():
	if a.Class()=='TimeOffset':
		tos.append(a)
for b in tos:
	b['time_offset'].setValue(tos.index(b))

set the ‘bbox’ for any selected Merge, Keymix & Copy nodes to “B”

for a in nuke.selectedNodes():
	classTypes = ['Merge' , 'Keymix', 'Copy', ]
	for n in classTypes:
		if n in a.Class():
			for p in a['bbox'].values():
				if 'B' in p:
					a['bbox'].setValue(a['bbox'].values().index(p))

remove all animation from a selected nodes

for a in nuke.selectedNode().knobs():
	nuke.selectedNode()[a].clearAnimated()

add keyframes – animate a mix

for a in nuke.selectedNodes():
	a['mix'].setAnimated()
	a['mix'].setValueAt(1,nuke.frame())
	a['mix'].setValueAt(0,(nuke.frame() - 1))

half the colour value of all the Constant nodes in a script

for a in nuke.allNodes():
	if a.Class() == "Constant":
		a['color'].setValue(a['color'].value()[0] / 2 , 0)
		a['color'].setValue(a['color'].value()[1] / 2 , 1)
		a['color'].setValue(a['color'].value()[2] / 2 , 2)

find all the transform nodes in a script, and if their input is a Crop, set the ‘scale’ value to be twice it’s current value (also checks if the scale is a list/array or a float)

for a in nuke.allNodes():
	if a.Class() == "Transform":
		if a.input(0).Class() == "Crop":
			x = a['scale'].value()
			if type(x).__name__ == 'list':
				a['scale'].setValue(x[0] * 2 , 0)
				a['scale'].setValue(x[1] * 2 , 1)
			if type(x).__name__ == 'float':
				a['scale'].setValue(x*2)

set all the gain values of all ColorCorrect nodes to be twice their current value

for a in nuke.allNodes():
	if a.Class() == "ColorCorrect":
		a['gain'].setValue(a['gain'].value() * 2)

print files with ‘mov’ in filename

for a in nuke.allNodes():
	if 'Read' in a['name'].value():
		if 'mov' in a['file'].value():
			print a['file'].value()

change font size of all “write” nodes in script

for a in nuke.selectedNodes():
	if "Write" in a['name'].value():
		a['note_font_size'].setValue(60)

create 20 constants with incrementing colour values

def makeConstants(amount):
	for i in range(amount):
		a= nuke.nodes.Constant()
		color= float( float(i) / float(amount) )
		a['color'].setValue(color)
makeConstants(20)

change the name of all Text nodes to contents the text “message”

for a in nuke.allNodes():
    if a.Class()=='Text':
        a.setName(a['message'].value())

10 thoughts on “some Nuke Python snippets”

Adam on Thu 27, May 2010 at 8:09 am said:

some helpful code:

http://francoislord.com/blog/tag/python
Adam on Wed 16, June 2010 at 11:16 am said:

Changing the value of a specific node in a group through python?
http://www.gfxtalk.com/forum/showthread.php?p=91701
Chapman on Tue 7, September 2010 at 8:25 am said:

Hey Adam, nice one – I was doing some post Sucker experimenting with Nuke+python, found this then realised it was you.

Cheers,
AC.
Adam on Mon 13, September 2010 at 2:48 am said:

Thanks Chapman!

Found some cool nuke python trickery?
If you do feel free to put something up as a comment on this post!
Hope all is well back in Sydney!
Steve on Fri 24, September 2010 at 5:37 am said:

How do you disable Read node thumbnails only?

Thanks.
Adam on Tue 28, September 2010 at 7:13 am said:

Hey Steve sorry for the delay, am currently doing some travel in Mexico.

Try this:

for a in nuke.allNodes():
if a.Class()==’Read’:
a['postage_stamp'].setValue(0)
Agoston on Sun 13, February 2011 at 1:57 am said:

#Set Read Nodes Missing Frames Nearest Frame

r = nuke.selectedNodes()
for i in r:
i['on_error'].setValue(“nearest_frame”)

#Set Shuffle Nodes Write Their Incoming Channels Out

s = nuke.allNodes(‘Shuffle’)
for i in s:
i['label'].setValue(“[value in]“)
Adam on Sun 13, February 2011 at 1:59 am said:

Nice one Agoston!
Thanks for your code!
Anshul on Fri 6, January 2012 at 2:03 pm said:

Great work Adam,
being late for the party, found out your nuke forum now only.
I have a query:
How to get the paths in Read nodes and if anyone updated, how to reload that again in the scene, without reloading the whole scene
Anshul on Fri 6, January 2012 at 6:51 pm said:

getting paths of all read nodes
for n in nuke.allNodes():
if n.Class() == ‘Read’:
print n['name'].value() + ‘ : ‘ + n['file'].value()

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10 thoughts on “some Nuke Python snippets”

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