Close

Hold CHOP

Summary

The Hold CHOP waits for a 0 to 1 step on its second input, at which time it reads the current values from the first input (one value per channel). It holds the values constant until it receives another 0 to 1 step. The second input controls the sampling. When the second input changes from 0 to 1, the first input is sampled. This value is held in the output until the second input changes from 0 to 1 again. Hold does not sample while the second input is 1, nor on the falling edge (1 to 0).

A common application for this CHOP is to grab the current value of a channel when an event occurs, so that value can be used until the event occurs again.

PythonIcon.pngholdCHOP_Class


Parameters - Sample Page

Sample sample - - Defines when to sample the input channels. The parameters are as follows.

  • Off to On offtoon - Sample incoming channel when the trigger channel goes from 0 to above 0.
  • While On whileon - Sample incoming channel while the trigger channel is above 0.
  • On to Off ontooff - Sample incoming channel when the trigger channel goes above 0 to 0.
  • While Off whileoff - Sample incoming channel while the trigger channel is 0.
  • On Value Change valuechange - Sample incoming channel whenever the trigger channel changes.

Hold Last hold - When On continue to sample the input, when Off hold the values.  

Hold Last Pulse holdpulse - Sample the input and hold those values when pulsed.  

Hold per Sample holdsamples - Useful for working with multi-sample channels, this applies the hold to each sample of the channel instead of only the last sample in the channel.  


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 -

TouchDesigner Build: