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
fanop - ⊞ - Selects either Fan In or Fan Out.
- Fan Out
- Fan In
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.
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 - 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
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 - 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.
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
autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).
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An which operate on (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.
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 is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See .
An that manipulates text strings: multi-line text or tables. Multi-line text is often a command , but can be any multi-line text. 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 . To refer instead to a filesystem folder, directory, disk file or
http: address, see .
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 by pressing the keyboard shortcut 'p'.
TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The is simply
/. A typical path is