Gesture CHOP

Summary

The Gesture CHOP records a short segment of the first input and loops this segment in time with options as specified in the Gesture Page. The second input defines the "listen" input. The third input is used to reset the gesture.

Tip: The gestureCapture component in the palette is much more powerful and flexible to capture and record channels, and has full UI.

In the Gesture CHOP, when the first channel of the listen input goes above zero, the Gesture CHOP begins recording the first input's channels. While listen is on, the input channels are output exactly as is. When the listen is turned off, the recorded segment of the channels is processed (trimmed and blended). While listen is off, the recorded segment is looped continuously.

The Gesture CHOP determines the number of beats that the listen was on for; this defines the period of the loop. If the beat frequency changes, the period will change with it.

If "Fit to Nearest Cycle" is Off, the beats are ignored and the gesture length is exactly the time it took to record - the recorded segment will be looped back with a period equal to the recorded length. When On, the captured gesture will be extended or trimmed to be a multiple of the beats per cycle.

gestureCHOP_Class

Parameters - Gesture Page

Play Mode playmode - ⊞ - Controls the gesture playback.

• Locked to Timeline locked - This mode locks the gesture position to the Timeline.

• Sequential sequential - This mode continually plays the gesture regardless of the timeline position. Reset and Reset Condition parameters below are enabled to allow some control.

Fit to Nearest Cycle fitmethod - When on the captured gesture will be extended or trimmed to be a multiple of the Beats Per Cycle.

Beats per Cycle numbeats - Specifies the number of beats to cycle the recorded animation around. If the recorded animation is longer than a multiple of the Beats Per Cycle, it will loop at that multiplied length.

Step Output step - If on, the cycled animation will adjust up or down each iteration to avoid jumps when looping to the beginning. For example, it would turn a simple 0-1 ramp gesture into a continuously increasing line.

Step Reset stepreset - When On and you re-record a gesture, the step will be zeroed.

Blend Time blend - How much of the recorded segment to use as a blend region. The blend region is used to blend the beginning of the segment to the end so that a seemless loop is produced.

Blend Time Unit blendunit -

Interpolate Samples interp - If on, recorded samples are interpolated when scaling occurs, otherwise the nearest sample is selected.

Speed speed - Scales the rate of playback for the segment.

Speed Unit speedunit -

Reset Condition resetcondition - ⊞ - This menu determines how the Reset input (the third input) triggers a reset of the channel(s).

• Off to On offtoon - Channels are reset when the Reset input goes off to on.

• While On on - Channels are reset when the Reset input goes on. The channel will hold the reset value until the input turns off.

• On to Off ontooff - Channels are reset when the Reset input goes on to off.

• While Off off - Channels are reset when the Reset input goes off. The channel will hold the reset value until the input turns on.

Reset reset - Resets the gesture while On when in Sequential Play Mode.

Reset Pulse resetpulse - Resets the gesture.

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. See Pattern Matching.

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: -
• Input 1: -
• Input 2: -

Info CHOP Channels

Extra Information for the Gesture CHOP can be accessed via an Info CHOP.

Common CHOP Info Channels

• start - Start of the CHOP interval in samples.

• length - Number of samples in the CHOP.

• sample_rate - The samplerate of the channels in frames per second.

• num_channels - Number of channels in the CHOP.

• time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.

• export_sernum - A count of how often the export connections have been updated.

Common Operator Info Channels

• total_cooks - Number of times the operator has cooked since the process started.

• cook_time - Duration of the last cook in milliseconds.

• cook_frame - Frame number when this operator was last cooked relative to the component timeline.

• cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.

• cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.

• cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.

• cooked_this_frame - 1 if operator was cooked this frame.

• warnings - Number of warnings in this operator if any.

• errors - Number of errors in this operator if any.

TouchDesigner Build: Latest\n2021.100002018.28070before 2018.28070

An Operator Family which operate on Channels (a sequence of numbers (Samples)) which are used for animation, audio, mathematics, simulation, logic, UI construction, and data streamed from/to devices and protocols.

The panel at the bottom of TouchDesigner, it controls the current global looping Time your TouchDesigner project, or of just one component.

To "pulse" a parameter is to send it a signal from (1) an exported CHOP channel or (2) a python command or (3) a mouse click that causes a new action to occur immediately. A pulse via python is via the .pulse() function on a pulse-type parameter, such as Reset parameter in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in an exported channel.

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 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. TOPs have Channel Mask, a similar feature.

samples-per-second of a CHOP. Each CHOP in your network has a sample rate. In contrast, the overall timeline has a Frame Rate, which is the number of frames to cook and display per second, generally your monitor display frequency, default 60.

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 python Script or GLSL Shader, 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/circle1, a node called circle1 in a component called geo1. The path / is called Root. This path is displayed at the top of every Pane, showing which Component's network you are currently in. To refer instead to a filesystem folder, directory, disk file or http: address, see Folder.

Every operator in TouchDesigner has a set of control Parameters that can be integer or floating point numbers, menus, binary toggles, text strings or operator paths, which determine the output of the operator.

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