td Module

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The td module contains all TouchDesigner related Python classes and utilities. All td module members and methods are imported when the application launches and are automatically available in scripts, expressions, and the textport.

For additional helpful Python classes and utilities not directly related to TouchDesigner, see the Tdu Module


meOP (Read Only):

Reference to the current operator that is being executed or evaluated. This can be used in parameter expressions, or DAT scripts.

absTimeabsTime (Read Only):

Reference to the AbsTime object.

appapp (Read Only):

Reference to the application installation.

extext (Read Only):

Reference to the extension searching object. See extensions for more information.

familiesdict (Read Only):

A dictionary containing a list of operator types for each operator family.

for a in families['SOP']:
	# do something with a

licenseslicenses (Read Only):

Reference to the currently installed licences.

modmod (Read Only):

Reference to the Module On Demand object.

monitorsmonitors (Read Only):

Reference to the group of available monitors.

opOP (Read Only):

The Shortcut object, for accessing operators through paths or shortcuts.

Note: a version of this method that searches relative to a specific operator is also in OP Class.

op(pattern1, pattern2...) OP or None

Returns the first OP whose path matches the given pattern, relative to the current OP, or None if nothing is found. Multiple patterns may be specified which are all added to the search. Numeric OP ids may also be used.

  • pattern - Can be string following the Pattern Matching rules, specifying which OP to return, or an integer, which must be an OP Id. Multiple patterns can be given, the first matching OP will be returned.
b = op('project1')
b = op('foot*', 'hand*')
b = op(154)

op.shortcut OP

An operator specified with by a shortcut. If no operator exists an exception is raised. These shortcuts are global, and must be unique. That is, cutting and pasting an operator with a Global OP Shortcut specified will lead to a name conflict. One shortcut must be renamed in that case. Furthermore, only components can be given Global OP Shortcuts.

  • shortcut - Corresponds to the Global OP Shortcut parameter specified in the target operator.
b = op.Videoplayer # or alternatively op.Videoplayer, as its not relative to this operator.

To list all Global OP Shortcuts:

for x in op:

parentOP (Read Only):

The Parent Shortcut object, for accessing parent components through indices or shortcuts.

Note: a version of this method that searches from a specific operator is also in OP Class.

parent(n) OP or None

The nth parent of the current operator. If n not specified, returns the parent. If n = 2, returns the parent of the parent, etc. If no parent exists at that level, None is returned.

  • n - (Optional) n is the number of levels up to climb. When n = 1 it will return the operator's parent.
p = parent(2) #grandfather

parent.shortcut OP

A parent component specified with a shortcut. If no parent exists an exception is raised.

  • shortcut - Corresponds to the Parent Shortcut parameter specified in the target parent.
   n = parent.Videoplayer

See also Parent Shortcut for more examples.

iopOP (Read Only):

The Internal Operator Shortcut object, for accessing internal shortcuts. Note: a version of this method that searches from a specific operator is also in OP Class.

iparOP (Read Only):

The Internal Operator Parameter Shortcut object, for accessing internal shortcuts. Note: a version of this method that searches from a specific operator is also in OP Class.

projectproject (Read Only):

Reference to the project session.

rootOP (Read Only):

Reference to the topmost root operator.

runsruns (Read Only):

Reference to the runs object, which contains delayed executions.

sysinfosysinfo (Read Only):

Reference to the system information.

uiui (Read Only):

Reference to the ui options.



Returns a passive version of the operator. Passive OPs do not cook before their members are accessed.

run(script, arg1, arg2..., endFrame=False, fromOP=None, asParameter=False, group=None, delayFrames=0, delayMilliSeconds=0, delayRef=me)Run:

Run the script specified as a string in the script parameter, returning a Run object which can be used to optionally modify its execution.

  • script - A string that is the script code to execute.
  • arg - (Optional) One or more arguments to be passed into the script when it executes. They are accessible in the script using a tuple named args.
  • endFrame - (Keyword, Optional) If True, the execution will be delayed until the end of the current frame.
  • fromOP - (Keyword, Optional) Specifies an optional operator from which the execution will be run relative to.
  • asParameter - (Keyword, Optional) When fromOP used, run relative to a parameter of fromOP.
  • group - (Keyword, Optional) Can be used to specify a string label for the group of Run objects this belongs to. This label can then be used with the td.runs object to modify its execution.
  • delayFrames - (Keyword, Optional) The number of frames to wait before executing the script.
  • delayMilliSeconds - (Keyword, Optional) The number of milliseconds to wait before executing the script. This value is rounded to the nearest frame.
  • delayRef - (Keyword, Optional) Specifies an optional operator from which the delay time is derived.

fetchStamp(key, default)value:

Return an object from the global stamped parameters. If the item is not found, the default is returned instead. Parameters can be stamped with the Copy SOP.

  • key - The name of the entry to retrieve.
  • default - If no item is found then the passed value is returned instead.
v = fetchStamp('sides', 3)


Find the value for the given variable.


Returns true if the variable is defined.

varOwner(varName)OP or None:

Returns the operator that defines the variable, or None if it's not defined.


Is True when called from the main application editing thread. Any calls that access operators, etc., must be called from the main thread.


Clear the textport of all text.

Python Classes and Modules[edit]

More detailed information about the contents of td module:

The following list of important Python classes and modules is roughly grouped together by subject.

Python Reference has an alphabetical list of all TouchDesigner Python pages on this wiki.

Operator Related Classes[edit]

The following classes are Python interfaces for operators and objects that operators use. Individual operator classes (e.g. TextTOP Class and RampTOP Class) are not listed but do exist in the td module, and links to each can be found here or by clicking on the Python Help button in their parameter dialog. These classes are found in the td module so do not need to be imported.

Helper Classes[edit]

The following helper objects are part of the td module and can thus be accessed anywhere, including expressions, without imports (e.g. absTime.frame).

Standard Python Modules[edit]

The td module also automatically imports a number of helpful standard modules, allowing them to be accessed in expressions through their namespace (e.g. math.cos(math.pi)):

  • collections - container datatypes
  • enum - support for enumerations
  • inspect - inspect live objects
  • math - mathematical functions
  • re - regular expression operations
  • sys - OS specific data and functions
  • warnings - warning control

TouchDesigner Utility Modules[edit]

These modules contain extended Python utilities for use with TouchDesigner.

  • TDStoreTools - utilities for use with TouchDesigner's Storage and Dependency system. This module can be imported directly (import TDStoreTools).
  • TDFunctions (op.TDModules.mod.TDFunctions) - A variety of utilities for advanced Python coding in TouchDesigner. This module cannot be imported directly. Instructions for use is at the top of its wiki page.
  • TDJSON (op.TDModules.mod.TDJSON) - JSON utilities specific to TouchDesigner. This module cannot be imported directly. Instructions for use is at the top of its wiki page.

3rd Party Packages[edit]

The following 3rd party packages are automatically installed with TouchDesigner. They are not in the td module, so must be imported explicitly to be used in scripts. The name in parentheses is the actual package name used (e.g. to use OpenCV, write this at top of script: import cv2). For information on adding or installing other Python modules, see Importing Modules.

  • asn1crypto (asn1crypto) - Parsing and serializing ASN.1 structures
  • Authlib (authlib) - Library to build OAuth and OpenID Connect servers.
  • Certifi (certifi) - Root Certificates for validating the trustworthiness of SSL certificates while verifying the identity of TLS hosts
  • CFFI (cffi) - Interaction with C code
  • Chardet (chardet) - The Universal Character Encoding Detector
  • Cryptography (cryptography) - High level recipes and low level interfaces to common cryptographic algorithms
  • idna (idna) - Support for the Internationalised Domain Names in Applications (IDNA) protocol
  • jsonpath (jsonpath_ng) - JSONPath tools for accessing and altering JSON structures
  • MWParserFromHell (mwparserfromhell) - An easy-to-use and outrageously powerful parser for MediaWiki wikicode
  • NumPy (numpy) - Fundamental package for scientific computing with Python
  • OpenCV (cv2) - Open source computer vision.
  • ply (ply) - Parsing tools for lex and yacc.
  • Requests (requests) - The only Non-GMO HTTP library for Python, safe for human consumption
  • Requests OAuthlib (requests_oauthlib) - Easy-to-use Python interface for building OAuth1 and OAuth2 clients
  • urllib3 (urllib3) - HTTP client
  • PyYAML (yaml) - YAML parser and emitter

Installing Custom Packages and Modules[edit]

You can also install your own Python packages that are not included with TouchDesigner. For instructions, go here.

TouchDesigner Build:

Any of the procedural data operators. OPs do all the work in TouchDesigner. They "cook" and output data to other OPs, which ultimately result in new images, data and audio being generated. See Node.

A Link.

An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a command Script, but can be any multi-line text. Tables are rows and columns of cells, each containing a text string.

An Operator Family that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.

A name for a component that is accessible from any node in a project, which can be declared in a component's Global Operator Shortcut parameter.

A Parent Shortcut is a parameter on a component that contains a name that you can use anywhere inside the component to refer to that component using the syntax parent.Name, for example parent.Effect.width to obtain panel width.

There are four types of shortcuts: Application Shortcuts that are built-in to TouchDesigner's authoring interface, Panel Shortcuts that you create for any custom built panels, Parent Shortcuts for accessing a component from within that component, and Global OP Shortcuts that access a unique component from anywhere in TouchDesigner.

An Operator Family that contains its own Network inside. There are twelve 3D Object Component and eight 2D Panel Component types. See also Network Path.

An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.

is the procedural mechanism in TouchDesigner, where if one piece of data changes, it automatically causes other operators and expressions to re-cook.

TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The Path is simply /. A typical path is /project1/moviein1.