The Select CHOP selects and renames channels from other CHOPs of any CHOP network. You can select the channels from control panel gadgets like sliders and buttons. It retrieves channels from one or more CHOPs.
It selects only the channels you specify. Example: "
c2 c5 c3 c3" will result in 4 channels, the last two identical, all in the specified order.
There are two ways of getting channels - through the CHOP and Channel Name parameters or directly from a CHOP connected to its input. All extract and renaming options apply when using the CHOP and Channel Name parameters instead of the wired input.
See Pattern Matching for selecting CHOPs and channels.
It can also rename channels by generating new channel names. See Pattern Expansion for patterns you can use.
See Channel Naming Patterns for more ways to manipulate existing channel names into new ones.
(The Select CHOP gets channels from any CHOP, the Parameter CHOP gets parameters of any OP.)
See also the Rename CHOP (Select CHOP does most of the same things and more.)
Parameters - Select Page
chop - The source(s) of the channels. (Assuming the CHOP is not directly connected).
channames - The names of the channels to keep. Name patterns may be used. Ex:
chan[1-5] *x /project1/geo1:t[xyz]
The order of the names determine the order of the output channels. If a channel is specified multiple times, it is included in the output multiple times.
renamefrom - The channel pattern to rename. See Pattern Matching.
renameto - The replacement pattern for the names. The default parameters do not rename the channels. See Pattern Expansion.
- Channel Names:
- Rename From:
- Rename To:
This example fetches channels
c1 c3 c5 c7 c9 and
They are then renamed to to
b1 b2 b3 b4 b5 and
See the Rename CHOP for a further description of rename patterns.
align - ⊞ - This menu handles cases where multiple input CHOPs have different start or end times. All channels output from a CHOP share the same start/end interval, so the inputs must be treated with the Align Options:
auto- It will trim to the current [Time Slice] if there are any Time Slices, else it will do an Extend Min/Max.
- Extend to Min/Max
none- Find the earliest start and latest end, and extend all inputs to that range using the extend conditions. (See Extend Conditions).
- Stretch to Min/Max
stretch- Find the earliest start and latest end, and stretch every channel's start and end to that range.
- Shift to Minimum
start- Find the earliest start and shift all channels so they all start at that index. All channels are extended to the length of the longest one.
- Shift to Maximum
end- Find the latest end and shift all channels so they all end at that index. Extend all channels to the length of the longest one.
- Shift to First Interval
shift1- Shift all channels to the start of the first CHOP and sample all inputs using the first input's range.
- Trim to First Interval
trim1- Trim all channels to first CHOP's range.
- Stretch to First Interval
stretch1- Stretch all channels to the first CHOP's range.
- Trim to Smallest Interval
trim- Trim all channels to the smallest start/end interval. The start and end values may not come from the same channel.
- Stretch to Smallest Interval
squash- Stretch all channels to the smallest start/end interval. The start and end values may not come from the same channel.
autoprefix - When 2 channels have the same name, turning on this option will add the node's name (or the node's parent's name, etc.) as a prefix to the channel name. For example, if selecting a channel from
/wave2/chan1, the channels would be renamed
chan2 if this option is off. Once turned on the channels would be named
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).
- Input 0 -
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Any of the procedural data operators. OPs do all the work in TouchDesigner. They "cook" and output data to other OPs, which ultimately result in new images, data and audio being generated. See Node.
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.
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'.