Composite CHOP

Summary

The Composite CHOP layers (blends) the channels of one CHOP on the channels of another CHOP. The first input is the base input and the second is the layer input. It is designed for blending static multi-frame motion channels. Blending time-sliced channels or single-frame channels should be done with the Blend CHOP.

Over the interval of the layer, the layer channels are blended with the base channels. The contribution of the layer is eased-in and eased-out according to the Start, Peak, Release and End parameters. The base is unaffected outside the interval of the layer.

The Effect parameter determines the amount of contribution of the layer.

If Base Hold is 0, the layer input will completely replace the base input when the effect is 1. If the Base Hold is 1, the layer will be added to the base.

The interval of the output starts at the minimum of the base and layer. The interval of the output ends at the maximum of the base and layer. The base's extend conditions are used if the layer lies outside the base.

Note: If the third input is supplied, the Effect page will be overridden by the third input's first channel, which should contain the effect values over the range of the layer.

compositeCHOP_Class

Parameters - Composite Page

Base Hold base - Determines how much of the base to blend into the output at points where the layer has an effect.

Match by match - ⊞ - Matches channels in the base input with ones in the layer input by either index or name.

• Channel Number index -

• Channel Name name -

• Channel Union union -

Quaternion Blend quatrot - Allows rotations with the quaternion attribute set to use spherical interpolation to produce smooth rotation blending (set in the Attribute CHOP).

Shortest Path Rotation Blending shortrot - It better-handles the blending from one set of angles to another, taking into account 0 degrees is 360 degrees.

Rotation Scope rotscope - Pattern (like *rx *ry *rz) that identifies which channels are rotations that should be handled specially as per the above option.

Cycle Length cyclelen - Blend 0 degrees to this angle, generally 360.

Parameters - Effect Page

Effect effect - Note: If the third input is supplied, the Effect page will be overridden by the third input's first channel, which should contain the effect values over the range of the layer.

Unit Values relative - ⊞ - Sets the meaning of the next four parameters - either Absolute values, Relative to the Start/End of the channel, or Relative to the Current Frame. The layer and base are never shifted.

• Absolute abs -

• Relative to Start/End rel -

• Relative to Current Frame cur -

Start start - The beginning of the composite interval. Effect is zero at the start.

Start Unit startunit -

Peak peak - Where the composite operation reaches maximum effect.
This value is held until the release point.

Peak Unit peakunit -

Release release - The point at which the effect begins to fall back towards zero.

Release Unit releaseunit -

End end - The end of the composite operation's effect. The effect reduces to zero again.

End Unit endunit -

Rise Shape risefunc - ⊞ - How to interpolate from one CHOP to another. It is the shape of the segment between the Start and Peak indices.

• Linear lin -

• Ease in ei -

• Ease out eo -

• Ease in Ease out cos -

• Cubic cub -

• Add add -

• Hold Previous holdprev -

Fall Shape fallfunc - ⊞ - How to interpolate from one CHOP to another. It is the shape of the segment between the Release and End.

• Linear lin -

• Ease in ei -

• Ease out eo -

• Ease in Ease out cos -

• Cubic cub -

• Add add -

• Hold Previous holdprev -

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 Composite 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\n2022.241402021.100002018.28070before 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 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.

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.

The term "Frame" is a measurement of time used (1) in the Timeline, (2) as a time-unit in CHOPs, and (3) as a time unit in movie files that are read into TOPs and written out from TOPs. The frame rate is the frames per second (FPS).

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.

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.

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.