Clip Blender CHOP

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Note: Only available in TouchDesigner Pro.

The Clip Blender CHOP is a an engine for blending, sequencing and scripting animation clips. It loads animation channel data that is formatted using Clip CHOPs. It reads clip CHOP paths from a specified DAT list which can be dynamically scripted. The Clip Blender plays clips from the list DAT; each time it reads a clip, it pop's the item off the list, and when the next clip plays through it will continue playing and popping clips off the list until it is empty. Once the list is empty the last animation in the sequence is looped.

Animation clips will typically come from an FBX or USD asset but can also be read using the Houdini bclip format or raw chan format. Animation clips found in FBX assets must be extracted from the asset hierarchy and then loaded speerately into a Clip CHOP. All Clip CHOP's loaded into the same clipblender must have the same number of channels, all channel names must match and the all clips must be the same sample rate. If any of these 3 important requirements are not met, there will likely be animation glitches.

Use the Info CHOP and Info DAT to extract information about its current state. See also the Clip CHOP and Clip DAT.


Parameters - ClipBlender Page

Default Clip CHOP default - Operator path to a valid Clip CHOP.

DAT List datlist - Operator path to a valid Table DAT.

Target target - - This parameter works in conjunction with the root transform channels as defined on the Channels page of the clpblender CHOP as well as the Clip CHOP parameter called Position Type. When Position Type is set to "Blend To Target" it will blend the root transform channels for the current clip to the new position defined in this parameter.

  • X targetx -
  • Y targety -
  • Z targetz -

Play Speed playspeed - Provides a scale value to slow down or speed up the playback of the animation sequence.

Step Forward stepforward - Unknown

Step Backward stepbackward - Unknown

A End Script aend - Broken

Delay Samples delay - Delays the output of animation data by the specified number of samples.

Reset reset - When On, resets the clipblender and holds it ready to play the clip defined by the Default Clip CHOP parameter.

Reset Pulse resetpulse - Instantly reset the cliblender and start playing the clip defined by the Default Clip CHOP parameter.

Parameters - Channels Page

Output Time Remaining timeremaining - A channel of the name defined in this parameter will return the time remaining in the current clip.

Time Channel timechannel - A channel of the name defined in this parameter will return the time elapsed in the current clip.

X Root Trans xtrans - The translate X channel of the animation hierarchy that defines the Clipblender Motion Root.

Y Root Trans ytrans - The translate Y channel of the animation hierarchy that defines the Clipblender Motion Root.

Z Root Trans ztrans - The translate Z channel of the animation hierarchy that defines the Clipblender Motion Root.

X Root Rot xrot - The rotate X channel of the animation hierarchy that defines the Clipblender Motion Root.

Y Root Rot yrot - The rotate Y channel of the animation hierarchy that defines the Clipblender Motion Root.

Z Root Rot zrot - The rotate Z channel of the animation hierarchy that defines the Clipblender Motion Root.

Queue Enable qenable - Specifies the name of the queue enable channel that may be added to all animation clips that will be loaded into this clipblender. A "Queue Enable" channel may be added to the animation clip to define when this clip is safe and unsafe for blending into other clips. If the animation is not safe for blending, the channel would be set to 1, which means the clipblender should "Queue" the next clip in the sequence instead of playing it. When the channel is 0, the any animation request will be executed immediately.

Queue Trigger qtrigger - Unknown

Pre-Rotate Adds prerotate - Unknown

Parameters - Transform Page

Transform Next Clip doxform -

Translate t - -

  • X tx -
  • Y ty -
  • Z tz -

Rotate r - -

  • X rx -
  • Y ry -
  • Z rz -

Print State printstate -

Log Jumps logjumps -

Jump Min jumpmin -

Jump Max jumpmax -

Jump Area XY jumpxy -

Fix Jump fixjump -

Log logpulse -

Parameters - Common Page

Time Slice timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.

Scope scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page.

Sample Rate Match srselect - - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.

  • Resample At First Input's Rate first - Use rate of first input to resample others.
  • Resample At Maximum Rate max - Resample to the highest sample rate.
  • Resample At Minimum Rate min - Resample to the lowest sample rate.
  • Error If Rates Differ err - Doesn't accept conflicting sample rates.

Export Method exportmethod - - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.

  • DAT Table by Index datindex - Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
  • DAT Table by Name datname - Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
  • Channel Name is Path:Parameter autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.

Export Root autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.

Export Table exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).

Operator Inputs

  • Input 0 -
  • Input 1 -
  • Input 2 -

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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.

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.

A set of commands located in a Text DAT that are triggered to run under certain conditions. There are two scripting languages in TouchDesigner: Python and the original Tscript. Scripts and single-line commands can also be run in the Textport.

To pulse a parameter is to send it a signal from a CHOP or python or a mouse click that causes a new action to occur immediately. A pulse via python is via the .pulse() function on a pulse-type parameter, such as Reset in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in a channel.

A CHOP outputs one or more channels, where a channel is simply a sequence of numbers, representing motion, audio, etc. Channels are passed between CHOPs in TouchDesigner networks. See also Export.

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.

A Time Slice is the time from the last cook frame to the current cook frame. In CHOPs it is the set of short channels that only contain the CHOP channels' samples between the last and the current cook frame.

A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator.

samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.

Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.

The location of an operator within the TouchDesigner environment, for example, /geo1/torus1, a node called torus1 in a component called geo1. The path / is called Root. To refer instead to a filesystem folder, directory, disk file or http: address, see Folder.

Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.