The Fan CHOP converts one channel out to many channels, or converts many channels down to one.

Its first operation, Fan Out, takes one channel and generates 2 or more channels. It sets to 1 one of the output channels while all others are 0, based on the input channel's value. The first output channel is index value 0, the second, 1, and so on. If the input value is above N-1 or below 0, the value can be clamped, cycled or ignored.

For example, if the value of the input channel at a certain frame is 4, and if the CHOP outputs 8 channels, the fifth channel will have a value of 1, and all other channels will have a zero value at that frame.

The input is assumed to have 1 channel which contains integer values; fractions are truncated and extra channels are ignored. The output channels are binary (0 or 1) channels.

The second operation, Fan In, does the opposite: it takes a bunch of binary inputs and produces one channel containing the index of the "On" channel. If more than one input channel is "On", the first "On" input channel is selected.


Parameters - Fan Page

Operation fanop - - Selects either Fan In or Fan Out.

  • Fan Out out -
  • Fan In in -

Channel Names channame - The names for the output channels that this CHOP creates. This also controls how many output channels are created (one for each name) in Fan Out mode. In Fan In mode, only one channel is created, and its name is the base name (minus the number suffix) of the first input channel.

Outside Range range - - Determines how to handle input values that are outside the index range (0 to N-1).

  • Clamp Index clamp - If less than 0, clamp to 0, and if greater than N-1, clamp to N-1.
  • Loop Index loop - Loop back through the index list.
  • Set Channels To 0 zero - Don't select any channels; set every channel to zero.

All Channels Off alloff - - For a Fan In operation, when all input channels are off, set the output to -1 or 0.

  • Set To 0 set0 - Selects the first channel.
  • Set To -1 setneg - Doesn't select any of the channels.

Quantize Output quantize - On by default. Channels are quatized to the nearest integer. For example, if the input channel's value is 5.6 and 6 channels are created, channel 5 is 1, while the rest are 0.

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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