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The Join CHOP takes all its inputs and appends one CHOP after another. It is expected they all have the same channels.

The end section of the first CHOP is overlapped with the start section of the second CHOP, and so on for the rest of the input CHOPs. The second input is shifted to line up with the end of the first.

Blending allows you to splice channels together by slowly phasing out one CHOP while phasing into the next, or by inserting interpolation curves between the channels of the adjacent CHOPs.

Quaternion Blend blends rotation triplets (rx ry rz) together using the shortest rotation arc. Rotation triplets are identified by "quaternion" attributes, which are set in the Attribute CHOP.

Translation Blending blends translation channels together by slowly changing from the final velocity of the previous channel to the initial velocity of the next. The next channel may be shifted up or down. If this is undesirable, use cubic blending instead (in the Shape menu). Translation Blending is done on channel triplets that represent translations or positions (*tx *ty *tz).


Parameters - Blend Page

Method blendmethod - - The blend method to produce a seamless sequence:

  • Preserve Length pre - The total length of the CHOPs is constant.
  • Overlap Sequences ovl - Overlaps the current CHOP with the prior CHOP. Better for audio.
  • Insert Blend Region ins - Inserts a region between the CHOPs where the blending is done.

Shape blendfunc - - The blend interpolation shape to use. See Shape in the Cycle CHOP.

  • Linear lin -
  • Ease in ei -
  • Ease out eo -
  • Ease in Ease out cos -
  • Cubic cub -
  • Add add -
  • Hold Previous holdprev -

First Input Specifies Blend Regions blendbyinput - When this is checked on, the first input can be a multi-channel input which specifies blend regions for the remaining inputs into the Join CHOP. Channel 1 of input0 is used to blend between input1 & input2, channel 2 between input2 & input3, and so on. If not enough channels are specified, the last channel is repeated.

Region blendregion - The size of the blend region.

Blend Region Unit blendregionunit -

Bias blendbias - Which segment to favour when blending: the previous (-1), the next (+1) or neither (0).

Match by match - - Match channels between inputs by index or by name.

  • Channel Number index -
  • Channel Name name -

Parameters - Scope Page

Step step - If set to 1, the next segment will be shifted up or down so that it begins where the last segment ended.

Step Scope stepscope - The names of channels that use Step.

Blend Scope blendscope - The names of the channels that should be blended. Other channels will not be blended.

Translate X Blend transscopex - The names of channels that will be translation-blended. Each string field contains a list of its component channels, such as *tx, *ty and *tz.

Translate Y Blend transscopey - The names of channels that will be translation-blended. Each string field contains a list of its component channels, such as *tx, *ty and *tz.

Translate Z Blend transscopez - The names of channels that will be translation-blended. Each string field contains a list of its component channels, such as *tx, *ty and *tz.

Parameters - Rotate Page

Quaternion Blend quatrot - Use quaternion blending on rotation channels.

Shortest Path Rotation Blending shortrot - If enabled, compensates.

Rotation Scope rotscope - Enabled when Shortest Path Rotation Blending is turned on.

Cycle Length cyclelen - Enabled when Shortest Path Rotation Blending is turned on.

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 -

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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.

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.

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.

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.

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.

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.

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'.

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.