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The Lag CHOP adds lag and overshoot to channels. It can also limit the velocity and acceleration of channels. Lag slows down rapid changes in the input channels. Overshoot amplifies the changes in the input channels.

Two values exist for each parameter. For example, in the Lag effect, when the input channel value is rising, the first lag parameter is used, and when the channel value is decreasing, the second lag parameter is used. This can give a quick rise, and a slow fall. But lag up and down are often kept at the same value.

For a similar, less-abrupt effect, see the Filter CHOP.


Parameters - Lag Page

Method lagmethod - - The method by which lag is applied to the channels.

  • Lag Value value - Up is defined as an increase in values of the input channels, and down is a decrease in values of the inputs.
  • Lag Amplitude amp - Up is defined as an increase in amplitude (moving away from zero) and down is defined as a decrease in amplitude (moving towards zero) of each input channel.
  • Lag Magnitude mag - All the input channels are treated as components of one vector, and each operation is applied to the vector as a whole. Only the first parameter in Lag, Overshoot, Clamp Slope and Clamp Acceleration applies in this mode.
  • Quaternion Rotation (Commercial) rotation - Allows the lag to work with quaternion rotations.

Lag lag - - Applies a lag to a channel. The first value is for lagging up, and the second is for lagging down. It is approximately the time that the output follows 90% of a change to the input.

  • lag1 - Lagging up value.
  • lag2 - Lagging down value.

Lag Unit lagunit - Choose between using Samples, Frames, or Seconds as the units for this parameter.

Overshoot overshoot - - Applies overshoot to a channel. The first value is for overshoot while moving up, and the second is for overshoot while moving down.

  • overshoot1 -
  • overshoot2 -

Overshoot Unit overshootunit - Choose between using Samples, Frames, or Seconds as the units for this parameter.

Clamp Slope clamp - Clamps the slope (or velocity) to lie between the values listed in Max Slope below. Slope is expressed as value/Units.

Max Slope slope - - The first value limits the slope when it is rising, and the second value limits the slope when it is decreasing.

  • slope1 -
  • slope2 -

Clamp Acceleration aclamp - Clamps the acceleration to lie between the values listed in Max Acceleration below. Acceleration is expressed as value/(Units*2) .

Max Acceleration accel - - The first value limits the acceleration when it is rising, and the second value limits the acceleration when it is decreasing.

  • accel1 -
  • accel2 -

Lag per Sample lagsamples - Applies the lag to each sample of the channel instead of across the whole channel. Useful for working with multi-sample channels.

Reset reset - When On resets (bypasses) the lag effect.

Reset Pulse resetpulse - Instantly resets the lag effect.

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.

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 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.

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.

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'.

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.