Pulse CHOP

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Summary
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The Pulse CHOP generates pulses in one channel at regular intervals. The amplitude of each pulse can be edited with the CHOP sliders or with handles on the graph.

The Pulse CHOP gives a set of pulses in a static channel of a specifiable length.

See also the LFO CHOP to get an endless stream of pulses that is Time Sliced, and the Pattern CHOP for a string of static pulses.

The Pulse CHOP can be used as triggers to the Copy CHOP, and can represent regularly-timed events.

By default, the pulses are a single sample long, but you can increase the Pulse Width so that the pulses are steps to the next pulse. You can also interpolate the values between pulses, as Linear, Ease In Ease Out, Cubic or other curves.

The pulses can be restricted to a minimum / maximum limit. If the Limit Type is Clamp, the graph has additional convenient handles at the minimum and maximum for each pulse.

The Pulse CHOP generates a single channel of up to 32 pulses, and you can merge several Pulse CHOPs into a multi-channel CHOP.

The Pulse CHOP uses its optional second input as a start/end reference, so a number of Pulse CHOPs can be stretched to the same interval.

In order to set the value at the last sample, the option, Last Pulse at Last Sample is provided. Otherwise, the last pulse is prior to the last sample.

PythonIcon.pngpulseCHOP_Class


Parameters - Pulse Page

Number of Pulses number - The number of pulses to generate.  

Interpolate interp - - You can interpolate the values between pulses using the following function curves:

  • Off nointerp - Disables interpolation.
  • Linear linear - Use linear interpolation between samples when the interval is lengthened. Averages all samples near the new sample when the interval is shortened.
  • Ease in easein - Uses an easein() function for blending.
  • Ease out easeout - Uses an easeout() function for blending.
  • Ease in Ease out cosine - Uses both easein() and easeout() functions.
  • Cubic cubic - Cubically interpolates between samples, for smoother curves than Linear. This method is not recommended for channels with sharp changes.

Pulse Width width - By default, the pulses are a single sample long, but you can increase the Pulse Width so that the pulses are steps to the next pulse.  

Pulse Width Unit widthunit - - Select the units to use for this parameter, Samples, Frames, or Seconds.

  • I samples -
  • F frames -
  • S seconds -

Limit Type limit - - Enable the Minimum and Maximum clamping values below with this menu.

  • Off nolimit - Pulses are allowed to be any value with no clamping.
  • Clamp clamp - Clamps pulse values to the Minimum and Maximum values specified below.

Minimum min - The pulses can be restricted to a Minimum limit. If the Limit Type is Clamp, the graph has additional convenient handles at the minimum for each pulse.  

Maximum max - The pulses can be restricted to a Maximum limit. If the Limit Type is Clamp, the graph has additional convenient handles at the maximum for each pulse.  

Last Pulse at Last Sample lastpulse - In order to set the value at the last sample, the option Last Pulse at Last Sample is provided. Otherwise, the last pulse is prior to the last sample.  


Parameters - Values Page

Pulse 0 pulse0 - The value of the sequence pulse.  


Parameters - Channel Page

Channel Names channelname - You can creates many channels with simple patterns like "chan[1-20]", which generates 20 channels from chan1 to chan20. See the section, Common CHOP Parameters for a description of this and all Options. See Scope and Channel Name Matching Options.  

Start start - Start of the interval, expressed in Units (seconds, frames or samples).  

Start Unit startunit - - Select the units to use for this parameter, Samples, Frames, or Seconds.

  • I samples -
  • F frames -
  • S seconds -

End end - End of the interval, expressed in Units (seconds, frames or samples).  

End Unit endunit - - Select the units to use for this parameter, Samples, Frames, or Seconds.

  • I samples -
  • F frames -
  • S seconds -

Sample Rate rate - The sample rate of the channels, in samples per second. Default: me.time.rate  

Extend Left left - - The left extend conditions (before/after range).

  • Hold hold - Hold the current value of the channel.
  • Slope slope - Continue the slope before the start of the channel.
  • Cycle cycle - Cycle the channel repeatedly.
  • Mirror mirror - Cycle the channel repeatedly, mirroring every other cycle.
  • Default Value default - Use the constant value specified in the Default Value parameter.

Extend Right right - - The right extend conditions (before/after range).

  • Hold hold - Hold the current value of the channel.
  • Slope slope - Continue the slope after the end of the channel.
  • Cycle cycle - Cycle the channel repeatedly.
  • Mirror mirror - Cycle the channel repeatedly, mirroring every other cycle.
  • Default Value default - Use the constant value specified in the Default Value parameter.

Default Value defval - The value used for the Default Value extend condition.  


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 -

TouchDesigner Build:

CHOPs
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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.

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.

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.

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.

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.