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.
*lastupdated: 26 April 2012
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:
passchange 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
