The Merge CHOP takes multiple inputs and merges them into the output. All the channels of the input appear in the output. The channel order is the channels of the first input followed by the channels of the second input, and so on.
Channel names may conflict, but a channel is renamed according to the Duplicate Names menu. The CHOP appends or increments the digits of the channel name until an unused name is found.
When the Time Slice flag on the Common parameter page is on, the Merge CHOP will merge only the current Time Slice of a channel, not the entire length of all the channels.
Parameters - Merge Page
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.
duplicate - ⊞ - When channels of the input CHOPs have the same name, this menu determines what to do.
- Make Unique
unique- Include all the input channels, and when there is a conflict of name, make the new channel's name similar but unique by adding digits to the name.
- Keep First
first- Include the channel of the first input CHOP which the name appears in, and discard any further channels with the same name.
- Keep Last
last- Include the channel of the last input CHOP which the name appears in, and discard any other channels with the same name.
- Replace First with Last
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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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'.