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Nuke Python API
Package nuke :: Class Node
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Class Node

object --+
         |
        nuke.Node
Known Subclasses:
Instance Methods [hide private]
Class of node
Class(self)
Returns: Class of node.
 
__getitem__(x, y)
x[y]
 
__len__(x)
len(x)
a new object with type S, a subtype of T
__new__(T, S, ...)
 
__reduce_ex__(...)
helper for pickle
 
__repr__(x)
repr(x)
 
__str__(x)
str(x)
None
addKnob(self, k)
Add knob k to this node or panel.
list
allKnobs(self)
Get a list of all knobs in this node, including nameless knobs.
None
autoplace(self)
Automatically place nodes, so they do not overlap.
List of x, y, w, h
bbox(self)
Bounding box of the node.
bool
canSetInput(self, i, node)
Check whether the output of 'node' can be connected to input i.
String list
channels(self)
List channels output by this node.
Number of clones
clones(self)
Returns: Number of clones.
bool
connectInput(self, i, node)
Connect the output of 'node' to the i'th input or the next available unconnected input.
Floating point value
deepSample(self, c, x, y, n)
Return pixel values from a deep image.
Integer value
deepSampleCount(self, x, y)
Return number of samples for a pixel on a deep image.
List of nodes
dependencies(self, what)
List all nodes referred to by this node.
List of nodes
dependent(self, what, forceEvaluate)
List all nodes that read information from this node.
bool
error()
True if the node or any in its input tree have an error, or False otherwise.
List of nodes and filenames
fileDependencies(self, start, end)
int
firstFrame(self)
First frame in frame range for this node.
None
forceValidate(self)
Force the node to validate itself, updating its hash.
Format
format(self)
Format of the node.
FrameRange
frameRange(self)
Frame range for this node.
str
fullName(self)
Get the name of this node and any groups enclosing it in 'group.group.name' form.
The number of knobs
getNumKnobs(self)
Returns: The number of knobs.
bool
hasError()
True if the node itself has an error, regardless of the state of the ops in its input tree, or False otherwise.
int
height(self)
Height of the node.
str
help(self)
Returns: Help for the node.
None
hideControlPanel(self)
Returns: None
The i'th input
input(self, i)
Returns: The i'th input.
Gets the maximum number of connected inputs
inputs(self)
Returns: Number of the highest connected input + 1.
bool
isSelected(self)
Returns the current selection state of the node.
The knob named p or the pth knob
knob(self, p)
Returns: The knob named p or the pth knob.
dict
knobs(self)
Get a dictionary of (name, knob) pairs for all knobs in this node.
int
lastFrame(self)
Last frame in frame range for this node.
List
linkableKnobs(self, knobType)
Returns a list of any knobs that may be linked to from the node as well as some meta information about the knob.
Maximum number of inputs this node can have
maxInputs(self)
Returns: Maximum number of inputs this node can have.
Maximum number of outputs this node can have
maxOutputs(self)
Returns: Maximum number of outputs this node can have.
Maximum number of inputs this node can have
maximumInputs(self)
Returns: Maximum number of inputs this node can have.
Maximum number of outputs this node can have
maximumOutputs(self)
Returns: Maximum number of outputs this node can have.
value or dict
metadata(self, key, time, view)
Return the metadata item for key on this node at current output context, or at optional time and view.
Minimum number of inputs this node can have
minInputs(self)
Returns: Minimum number of inputs this node can have.
Minimum number of inputs this node can have
minimumInputs(self)
Returns: Minimum number of inputs this node can have.
str
name(self)
Returns: Name of node.
The number of knobs
numKnobs(self)
Returns: The number of knobs.
list of int
opHashes(self)
Returns a list of hash values, one for each op in this node.
Number of first optional input
optionalInput(self)
Returns: Number of first optional input.
Returns performance information for this node
performanceInfo(self, category)
Performance timing must be enabled.
int
pixelAspect(self)
Pixel Aspect ratio of the node.
bool
proxy(self)
Returns: True if proxy is enabled, False otherwise.
None
readKnobs(self, s)
Read the knobs from a string (TCL syntax).
None
redraw(self)
Force a redraw of the node.
None
removeKnob(self, k)
Remove knob k from this node or panel.
None
resetKnobsToDefault(self)
Reset all the knobs to their default values.
Node rendering when paralled threads are running or None
running(self)
Class method.
Floating point value
sample(self, c, x, y, dx, dy)
Return pixel values from an image.
int
screenHeight(self)
Height of the node when displayed on screen in the DAG, at 1:1 zoom, in pixels.
int
screenWidth(self)
Width of the node when displayed on screen in the DAG, at 1:1 zoom, in pixels.
None
selectOnly(self)
Set this node to be the only selection, as if it had been clicked in the DAG.
bool
setInput(self, i, node)
Connect input i to node if canSetInput() returns true.
None
setName(self, name, uncollide=True, updateExpressions=False)
Set name of the node and resolve name collisions if optional named argument 'uncollide' is True.
None
setSelected(self, selected)
Set the selection state of the node.
None
setTab(self, tabIndex)
Returns: None
None
setXYpos(self, x, y)
Set the (x, y) position of node in node graph.
None
setXpos(self, x)
Set the x position of node in node graph.
None
setYpos(self, y)
Set the y position of node in node graph.
None
showControlPanel(self, forceFloat= false)
Returns: None
None
showInfo(self, s)
Creates a dialog box showing the result of script s.
true if the properties panel is open
shown(self)
This can be used to skip updates that are not visible to the user.
bool
treeHasError()
True if the node or any in its input tree have an error, or False otherwise.
FrameRange
upstreamFrameRange(self, i)
Frame range for the i'th input of this node.
int
width(self)
Width of the node.
String in .nk form
writeKnobs(self, i)
Return a tcl list.
X position of node in node graph
xpos(self)
Returns: X position of node in node graph.
Y position of node in node graph
ypos(self)
Returns: Y position of node in node graph.

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __init__, __reduce__, __setattr__, __sizeof__, __subclasshook__

Properties [hide private]

Inherited from object: __class__

Method Details [hide private]

Class(self)

 
Returns: Class of node
Class of node.

__new__(T, S, ...)

 
Returns: a new object with type S, a subtype of T
Overrides: object.__new__

__reduce_ex__(...)

 

helper for pickle

Overrides: object.__reduce_ex__
(inherited documentation)

__repr__(x)
(Representation operator)

 

repr(x)

Overrides: object.__repr__

__str__(x)
(Informal representation operator)

 

str(x)

Overrides: object.__str__

addKnob(self, k)

 

Add knob k to this node or panel.

Parameters:
  • k - Knob.
Returns: None
None.

allKnobs(self)

 

Get a list of all knobs in this node, including nameless knobs.

For example:

>>> b = nuke.nodes.Blur()
>>> b.allKnobs()
Returns: list
List of all knobs.

Note that this doesn't follow the links for Link_Knobs

autoplace(self)

 

Automatically place nodes, so they do not overlap.

Returns: None
None.

bbox(self)

 

Bounding box of the node.

Returns: List of x, y, w, h
List of x, y, w, h.

canSetInput(self, i, node)

 

Check whether the output of 'node' can be connected to input i.

Parameters:
  • i - Input number.
  • node - The node to be connected to input i.
Returns: bool
True if node can be connected, False otherwise.

channels(self)

 

List channels output by this node.

Returns: String list
String list.

clones(self)

 
Returns: Number of clones
Number of clones.

connectInput(self, i, node)

 

Connect the output of 'node' to the i'th input or the next available unconnected input. The requested input is tried first, but if it is already set then subsequent inputs are tried until an unconnected one is found, as when you drop a connection arrow onto a node in the GUI.

Parameters:
  • i - Input number to try first.
  • node - The node to connect to input i.
Returns: bool
True if a connection is made, False otherwise.

deepSample(self, c, x, y, n)

 

Return pixel values from a deep image. This requires the image to be calculated, so performance may be very bad if this is placed into an expression in a control panel.

Parameters:
  • c - Channel name.
  • x - Position to sample (X coordinate).
  • y - Position to sample (Y coordinate).
  • n - Sample index (between 0 and the number returned by deepSampleCount() for this pixel, or -1 for the frontmost).
Returns: Floating point value
Floating point value.

deepSampleCount(self, x, y)

 

Return number of samples for a pixel on a deep image. This requires the image to be calculated, so performance may be very bad if this is placed into an expression in a control panel.

Parameters:
  • x - Position to sample (X coordinate).
  • y - Position to sample (Y coordinate).
Returns: Integer value
Integer value.

dependencies(self, what)

  
List all nodes referred to by this node. 'what' is an optional integer (see below).
You can use the following constants or'ed together to select what types of dependencies are looked for:
         nuke.EXPRESSIONS = expressions
         nuke.INPUTS = visible input pipes
         nuke.HIDDEN_INPUTS = hidden input pipes.
The default is to look for all types of connections.

Example:
nuke.toNode('Blur1').dependencies( nuke.INPUTS | nuke.EXPRESSIONS )
@param what: Or'ed constant of nuke.EXPRESSIONS, nuke.INPUTS and nuke.HIDDEN_INPUTS to select the types of dependencies. The default is to look for all types of connections.
@return: List of nodes.
Returns: List of nodes

dependent(self, what, forceEvaluate)

  
List all nodes that read information from this node.  'what' is an optional integer:
         You can use any combination of the following constants or'ed together to select what types of dependent nodes to look for:
                 nuke.EXPRESSIONS = expressions
                 nuke.INPUTS = visible input pipes
                 nuke.HIDDEN_INPUTS = hidden input pipes.
The default is to look for all types of connections.

forceEvaluate is an optional boolean defaulting to True. When this parameter is true, it forces a re-evaluation of the entire tree. 
This can be expensive, but otherwise could give incorrect results if nodes are expression-linked. 

Example:
nuke.toNode('Blur1').dependent( nuke.INPUTS | nuke.EXPRESSIONS )
@param what: Or'ed constant of nuke.EXPRESSIONS, nuke.INPUTS and nuke.HIDDEN_INPUTS to select the types of dependent nodes. The default is to look for all types of connections.
@param forceEvaluate: Specifies whether a full tree evaluation will take place. Defaults to True.
@return: List of nodes.
Returns: List of nodes

error()

 

True if the node or any in its input tree have an error, or False otherwise.

Error state of the node and its input tree. Deprecated; use hasError or treeHasError instead. Note that this will always return false for viewers, which cannot generate their input trees. Instead, choose an input of the viewer (e.g. the active one), and call treeHasError() on that.

Returns: bool

fileDependencies(self, start, end)

 
Parameters:
  • start - first frame
  • end - last frame Returns the list of input file dependencies for this node and all nodes upstream from this node for the given frame range. The file dependencies are calcuated by searching for Read ops or ops with a File knob. All views are considered and current proxy mode is used to decide on whether full format or proxy files are returned. Note that Write nodes files are also included but precomps, gizmos and external plugins are not. Any time shifting operation such as frameholds, timeblurs, motionblur etc are taken into consideration. @return The return list is a list of nodes and files they require. Eg. [Read1, ['file1.dpx, file2.dpx'] ], [Read2, ['file3.dpx', 'file4.dpx'] ] ]
Returns: List of nodes and filenames

firstFrame(self)

 

First frame in frame range for this node.

Returns: int
int.

format(self)

 

Format of the node.

Returns: Format
Format.

frameRange(self)

 

Frame range for this node.

Returns: FrameRange
FrameRange.

fullName(self)

 

Get the name of this node and any groups enclosing it in 'group.group.name' form.

Returns: str
The fully-qualified name of this node, as a string.

getNumKnobs(self)

 
Returns: The number of knobs
The number of knobs.

hasError()

 

True if the node itself has an error, regardless of the state of the ops in its input tree, or False otherwise.

Error state of the node itself, regardless of the state of the ops in its input tree. Note that an error on a node may not appear if there is an error somewhere in its input tree, because it may not be possible to validate the node itself correctly in that case.

Returns: bool

height(self)

 

Height of the node.

Returns: int
int.

help(self)

 
Returns: str
Help for the node.

hideControlPanel(self)

 
Returns: None
None

input(self, i)

 
Parameters:
  • i - Input number.
Returns: The i'th input
The i'th input.

inputs(self)

 
Returns: Gets the maximum number of connected inputs
Number of the highest connected input + 1. If inputs 0, 1, and 3 are connected, this will return 4.

isSelected(self)

 

Returns the current selection state of the node. This is the same as checking the 'selected' knob.

Returns: bool
True if selected, or False if not.

knob(self, p)

 
Parameters:
  • p - A string or an integer.
Returns: The knob named p or the pth knob
The knob named p or the pth knob.

Note that this follows the links for Link_Knobs

knobs(self)

 

Get a dictionary of (name, knob) pairs for all knobs in this node.

For example:

>>> b = nuke.nodes.Blur()
>>> b.knobs()
Returns: dict
Dictionary of all knobs.

Note that this doesn't follow the links for Link_Knobs

lastFrame(self)

 

Last frame in frame range for this node.

Returns: int
int.

linkableKnobs(self, knobType)

 

Returns a list of any knobs that may be linked to from the node as well as some meta information about the knob. This may include whether the knob is enabled and whether it should be used for absolute or relative values. Not all of these variables may make sense for all knobs..

Parameters:
  • knobType, A, KnobType, describing, the, type, of, knobs, you, want.@return - A list of LinkableKnobInfo that may be empty .
Returns: List

maxInputs(self)

 
Returns: Maximum number of inputs this node can have
Maximum number of inputs this node can have.

maxOutputs(self)

 
Returns: Maximum number of outputs this node can have
Maximum number of outputs this node can have.

maximumInputs(self)

 
Returns: Maximum number of inputs this node can have
Maximum number of inputs this node can have.

maximumOutputs(self)

 
Returns: Maximum number of outputs this node can have
Maximum number of outputs this node can have.

metadata(self, key, time, view)

 

Return the metadata item for key on this node at current output context, or at optional time and view. If key is not specified a dictionary containing all key/value pairs is returned. None is returned if key does not exist on this node.

Parameters:
  • key - Optional name of the metadata key to retrieve.
  • time - Optional time to evaluate at (default is taken from node's current output context).
  • view - Optional view to evaluate at (default is taken from node's current output context).
Returns: value or dict
The requested metadata value, a dictionary containing all keys if a key name is not provided, or None if the specified key is not matched.

minInputs(self)

 
Returns: Minimum number of inputs this node can have
Minimum number of inputs this node can have.

minimumInputs(self)

 
Returns: Minimum number of inputs this node can have
Minimum number of inputs this node can have.

name(self)

 
Returns: str
Name of node.

numKnobs(self)

 
Returns: The number of knobs
The number of knobs.

optionalInput(self)

 
Returns: Number of first optional input
Number of first optional input.

performanceInfo(self, category)

 

Performance timing must be enabled.

Returns: Returns performance information for this node
A dictionary containing the cumulative performance info for this category, where: callCount = the number of calls made timeTakenCPU = the CPU time spent in microseconds timeTakenWall = the actual time ( wall time ) spent in microseconds

pixelAspect(self)

 

Pixel Aspect ratio of the node.

Returns: int
float.

proxy(self)

 
Returns: bool
True if proxy is enabled, False otherwise.

readKnobs(self, s)

 

Read the knobs from a string (TCL syntax).

Parameters:
  • s - A string.
Returns: None
None.

redraw(self)

 

Force a redraw of the node.

Returns: None
None.

removeKnob(self, k)

 

Remove knob k from this node or panel. Throws a ValueError exception if k is not found on the node.

Parameters:
  • k - Knob.
Returns: None
None.

running(self)

 

Class method.

Returns: Node rendering when paralled threads are running or None
Node rendering when paralled threads are running or None.

sample(self, c, x, y, dx, dy)

 

Return pixel values from an image. This requires the image to be calculated, so performance may be very bad if this is placed into an expression in a control panel. Produces a cubic filtered result. Any sizes less than 1, including 0, produce the same filtered result, this is correct based on sampling theory. Note that integers are at the corners of pixels, to center on a pixel add .5 to both coordinates. If the optional dx,dy are not given then the exact value of the square pixel that x,y lands in is returned. This is also called 'impulse filtering'.

Parameters:
  • c - Channel name.
  • x - Centre of the area to sample (X coordinate).
  • y - Centre of the area to sample (Y coordinate).
  • dx - Optional size of the area to sample (X coordinate).
  • dy - Optional size of the area to sample (Y coordinate).
  • frame - Optional frame to sample the node at.
Returns: Floating point value
Floating point value.

screenHeight(self)

 

Height of the node when displayed on screen in the DAG, at 1:1 zoom, in pixels.

Returns: int
int.

screenWidth(self)

 

Width of the node when displayed on screen in the DAG, at 1:1 zoom, in pixels.

Returns: int
int.

selectOnly(self)

 

Set this node to be the only selection, as if it had been clicked in the DAG.

Returns: None
None.

setInput(self, i, node)

 

Connect input i to node if canSetInput() returns true.

Parameters:
  • i - Input number.
  • node - The node to connect to input i.
Returns: bool
True if canSetInput() returns true, or if the input is already correct.

setName(self, name, uncollide=True, updateExpressions=False)

 

Set name of the node and resolve name collisions if optional named argument 'uncollide' is True.

Parameters:
  • name - A string.
  • uncollide - Optional boolean to resolve name collisions. Defaults to True.
  • updateExpressions - Optional boolean to update expressions in other nodes to point at the new name. Defaults to False.
Returns: None
None

setSelected(self, selected)

 

Set the selection state of the node. This is the same as changing the 'selected' knob.

Parameters:
  • selected - New selection state - True or False.
Returns: None
None.

setTab(self, tabIndex)

 
Parameters:
  • tabIndex - The tab to show (first is 0).
Returns: None
None

setXYpos(self, x, y)

 

Set the (x, y) position of node in node graph.

Parameters:
  • x - The x position of node in node graph.
  • y - The y position of node in node graph.
Returns: None
None.

setXpos(self, x)

 

Set the x position of node in node graph.

Parameters:
  • x - The x position of node in node graph.
Returns: None
None.

setYpos(self, y)

 

Set the y position of node in node graph.

Parameters:
  • y - The y position of node in node graph.
Returns: None
None.

showControlPanel(self, forceFloat= false)

 
Parameters:
  • forceFloat - Optional python object. If it evaluates to True the control panel will always open as a floating panel. Default is False.
Returns: None
None

showInfo(self, s)

 

Creates a dialog box showing the result of script s.

Parameters:
  • s - A string.
Returns: None
None.

shown(self)

 

This can be used to skip updates that are not visible to the user.

Returns: true if the properties panel is open
true if the properties panel is open. This can be used to skip updates that are not visible to the user.

treeHasError()

 

True if the node or any in its input tree have an error, or False otherwise.

Error state of the node and its input tree. Note that this will always return false for viewers, which cannot generate their input trees. Instead, choose an input of the viewer (e.g. the active one), and call treeHasError() on that.

Returns: bool

upstreamFrameRange(self, i)

 

Frame range for the i'th input of this node.

Parameters:
  • i - Input number.
Returns: FrameRange
FrameRange. Returns None when querying an invalid input.

width(self)

 

Width of the node.

Returns: int
int.

writeKnobs(self, i)

  
Return a tcl list. If TO_SCRIPT | TO_VALUE is not on, this is a simple list
of knob names. If it is on, it is an alternating list of knob names
and the output of to_script().

Flags can be any of these or'd together:
- nuke.TO_SCRIPT produces to_script(0) values
- nuke.TO_VALUE produces to_script(context) values
- nuke.WRITE_NON_DEFAULT_ONLY skips knobs with not_default() false
- nuke.WRITE_USER_KNOB_DEFS writes addUserKnob commands for user knobs
- nuke.WRITE_ALL writes normally invisible knobs like name, xpos, ypos

@param i: The set of flags or'd together. Default is TO_SCRIPT | TO_VALUE.
@return: String in .nk form.
Returns: String in .nk form

xpos(self)

 
Returns: X position of node in node graph
X position of node in node graph.

ypos(self)

 
Returns: Y position of node in node graph
Y position of node in node graph.

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