# Logic CHOP

## Summary

The Logic CHOP first converts channels of all its input CHOPs into binary (0 = off, 1 = on) channels and then combines the channels using a variety of logic operations.

NOTE: The Logic CHOP is superceded by more convenient operators like the CHOP Execute DAT or the Text DAT which will run their scripts when CHOP channels change.

The Logic CHOP performs logic operations on the samples in CHOP channels. The channels of a CHOP can be combined into one channel, and several CHOPs can be combined into one CHOP.

With one input CHOP, you can invert the values of each sample. You can also do logic operations on the samples of one channel by the samples in the other channels, reducing N channels down to one. You can combine by applying an "or", "and", etc..

With two or more CHOP inputs, you can combine the channels in one CHOP with the channels in all the other CHOPs, reducing N CHOPs to 1.

To do math operations (add, multiply, ...) between channels or CHOPs, use the Math CHOP.

## Parameters - Logic Page

Convert Input `convert` - - This menu determines the method to convert inputs to binary:

• Off When Zero `nonzero` - Returns a logical 0 when channel value is zero;
Non zero values return 1.
• Off When Zero Or Less `pos` - Returns a logical 0 when a channel value is zero or less; and 1 when values are positive.
• Off When Outside Bounds `bound` - Returns 0 when channel value is outside the bounds set by the Bounds parameter below.
• On When Value Changed `valchange` - Returns 1 when the channel value changes.
• On When Channel Name Changed `namechange` - Returns 1 when the channel name changes.

Channel Pre OP `preop` - - Once converted by the Convert Input stage, Channel Pre OP defines a unary operation on each input sample:

• Off `off` -
• Invert `invert` - Changes 0 to 1; and 1 to 0.
• Toggle `toggle` - Causes each 0 to 1 transition of the input channel to switch the current state between 0 and 1.
• Radio Button `radio` - Only one channel per input can be on at once. If another channel turns on, the previously "on" channel is turned off.
• Last Two On `radio2` - This is like Radio Button, but it keeps up to two channels on. If followed by a Lag CHOP, it is useful for blending between pairs of poses.
• Rising Edge `rise` - On for one sample only, at each place where a channel goes from off to on.
• Falling Edge `fall` - On for one sample only, at each place where a a channel goes from on to off.

Combine Channels `chanop` - - Takes the first input and combines its channels, then the second input and combines its channels, and so on.

• Off `off` -
• And `and` -
• Or `or` -
• Exclusive Or `xor` -
• Not And `nand` -
• Not Or `nor` -
• Equivalence `eqv` -
• Lowest Index On `lowest` -
• Highest Index On `highest` -

Combine CHOPs `chopop` - - Combine CHOPs combines the first channels of each CHOP, the second channels of each CHOP, etc.. Channels between inputs can be combined by number or name. Combining (Logic) Operations are:

• Off `off` -
• And `and` - On if all inputs are on, otherwise off.
• Or `or` - On if at least one input is on, otherwise off.
• Exclusive Or `xor` - On if one input on, but not more than one.
• Not And `nand` - Off if all inputs are on, otherwise on.
• Not Or `nor` - Off if at least one input is on, otherwise on.
• Equivalence `eqv` - On if inputs are equal (all on or off), otherwise off.
• Lowest Index On `lowest` - Gives the lowest index of the channel that is currently on,
or -1 if no channels are on.
• Highest Index On `highest` - Gives the highest index of the channel that is currently on on,
or -1 if no channels are on.

Match by `match` - - Channels are matched between inputs by Channel Name or Channel Number.

• Channel Number `index` -
• Channel Name `name` -

Align `align` - - Inputs that don't start at the same frame can be aligned. Se the section, Align Options.

• Automatic `auto` -
• Extend to Min/Max `none` -
• Stretch to Min/Max `stretch` -
• Shift to Minimum `start` -
• Shift to Maximum `end` -
• Shift to First Interval `shift1` -
• Trim to First Interval `trim1` -
• Stretch to First Interval `stretch1` -
• Trim to Smallest Interval `trim` -
• Stretch to Smallest Interval `squash` -

Bounds `bound` - - Set lower and upper bounds for when Convert Input is set to Off When Outside Bounds.

• `boundmin` -
• `boundmax` -

## 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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An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.

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.

An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a command Script, but can be any multi-line text. Tables 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 Root. To refer instead to a filesystem folder, directory, disk file or `http:` address, see Folder.

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'.

TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The Path is simply `/`. A typical path is `/project1/moviein1`.