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

*lastupdated: 23 May 2012

“Autowrite” node
Copy the following line into the python “beforeRender” field in a write node.
The write node’s “file” field will be filled based on the script’s name/path.
Obviously this all depends on your pipeline etc.

For my current situation each vfx shot has it’s own directory, which is then populated with “renders” & “scripts” subdirectories.
So for me I can do this:

nuke.thisNode()["file"].setValue(nuke.root().name().replace("scripts","renders").replace(".nk",".mov"))

delete all nodes that are not selected

s = nuke.selectedNodes()
b = nuke.allNodes()
 
for n in b:
    if n not in s:
        nuke.delete(n)

selects all dependencies (input nodes & their parents) from a selected node

a = nuke.selectedNode()
nodesToSelect = []
 
nodesToSelect.append(a)
def climb(node):
    # print node.name()
    for n in node.dependencies():
        nodesToSelect.append(a)
        climb(n)
 
climb(a)
 
for x in nodesToSelect:
	print x.name()
    # x.setSelected(1)

set all Read nodes to cache locally

for a in nuke.allNodes():
    if a.Class()=='Read':
        a['cached'].setValue(1)
        a['cacheLocal'].setValue(0)

print last frame of script

print nuke.root()['last_frame'].value()

create a backdrop based on selected Nodes

margin = 100
xpMax = nuke.selectedNode().xpos()
xpMin = nuke.selectedNode().xpos()
ypMax = nuke.selectedNode().ypos()
ypMin = nuke.selectedNode().ypos()
 
for a in nuke.selectedNodes():
    if a.xpos() > xpMax:
        xpMax = a.xpos()
    if a.xpos() < xpMin:
        xpMin = a.xpos()
    if a.ypos() > ypMax:
        ypMax = a.ypos()
    if a.ypos() < ypMin:
        ypMin = a.ypos()
 
bd = nuke.nodes.BackdropNode(bdwidth=(xpMax-xpMin)+margin, bdheight=(ypMax-ypMin)+margin) 
bd.setXpos(xpMin-margin/2)
bd.setYpos(ypMin-margin/2)

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())

##Expressions
(in an expression node) – alpha channel – if the y value of the pixel is even, make it 0, else make it 1 (for viewing fields?)
y%2==1?0:1

19 Comments

• At Thu 27, May 2010, Adam wrote:

  some helpful code:

  http://francoislord.com/blog/tag/python

• At Wed 16, June 2010, Adam wrote:

  Changing the value of a specific node in a group through python?

  http://www.gfxtalk.com/forum/showthread.php?p=91701

• At Tue 7, September 2010, Chapman wrote:

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

  Cheers,

  AC.

• At Mon 13, September 2010, Adam wrote:

  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!

• At Fri 24, September 2010, Steve wrote:

  How do you disable Read node thumbnails only?

  Thanks.

• At Tue 28, September 2010, Adam wrote:

  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)

• At Sun 13, February 2011, Agoston wrote:

  #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]")

• At Sun 13, February 2011, Adam wrote:

  Nice one Agoston!

  Thanks for your code!

• At Fri 6, January 2012, Anshul wrote:

  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

• At Fri 6, January 2012, Anshul wrote:

  getting paths of all read nodes

  for n in nuke.allNodes():

  if n.Class() == 'Read':

  print n['name'].value() + ' : ' + n['file'].value()

• At Tue 6, March 2012, Adam wrote:

  Nice One Anshul! Thanks for sharing!

• At Thu 15, March 2012, Marc Gutowski wrote:

  # print all nodes with no connected output

  (maybe helpful to find dead branches end in high complex comps)

  for node in nuke.allNodes():

  if not len(node.dependent()):

  if not node.maxOutputs() == 0:

  print node.name()

• At Thu 15, March 2012, Adam wrote:

  Looks great Marc! Thanks for sharing your code!

• At Thu 19, April 2012, NIK wrote:

  Can you help me please?! I'm having trouble duplicating a node through python.

  I have a group node with a few nodes inside. I also have 10 read nodes. What I would like to do it is select all my read nodes and have the script duplicate the group and place input to the read.

  any help would be greatly appreciated!

  Thanks

• At Tue 24, April 2012, Douglas wrote:

  Hi Adam, Great stuff!

  I see you have code to select all read nodes but how do you select all read nodes above a selected node?

• At Wed 25, April 2012, Adam wrote:

  Hey Douglas!

  Thanks for the nice words!

  I had a quick look, try this (i´ll add it above):

  a = nuke.selectedNode()

  nodesToSelect = []

  nodesToSelect.append(a)

  def climb(node):

  # print node.name()

  nodesToSelect.append(node)

  for n in node.dependencies():

  climb(n)

  climb(a)

  for x in nodesToSelect:

  print x.name()

  x.setSelected(1)

• At Fri 27, April 2012, Adam wrote:

  another Nuke Python resource:

  http://nullege.com/codes/search/nuke.ask

• At Sat 5, May 2012, Marc Gutowski wrote:

  Hey Adam,

  i've put some of my Nuke Snippets online:

  http://ewok1.com/resources/

  best regeards,

  Marc

• At Sun 6, May 2012, Adam wrote:

  Hey Marc!

  Thanks for sharing your your snippets!

  Some great ones in there from what I can see.

  Keep up the great work!

  Cheers

  Adam

Teale Reel from Adam Teale on Vimeo.

Some work from the past 2 years in Bangkok, Thailand at finito! films

3 Comments

• At Fri 19, June 2009, Bart Verkoeijen wrote:

  So that's what you've been doing in one of the world's cities. Cool stuff! I'm stunned! :-O

• At Wed 24, June 2009, BENNY wrote:

  I really like kon thai jai yen ! That's very cool VFX demo reel man ,work with you again soon .

  BENNY

• At Thu 25, June 2009, Adam wrote:

  thanks guys!

  @Benny - will see you guys soon.