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.
Parameters - Composite Page
base - Determines how much of the base to blend into the output at points where the layer has an effect.
match - ⊞ - Matches channels in the base input with ones in the layer input by either index or name.
- Channel Number
- Channel Name
- Channel Union
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.
rotscope - Pattern (like *rx *ry *rz) that identifies which channels are rotations that should be handled specially as per the above option.
cyclelen - Blend 0 degrees to this angle, generally 360.
Parameters - Effect Page
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.
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.
- Relative to Start/End
- Relative to Current Frame
start - The beginning of the composite interval. Effect is zero at the start.
startunit - ⊞ -
peak - Where the composite operation reaches maximum effect.
This value is held until the release point.
peakunit - ⊞ -
release - The point at which the effect begins to fall back towards zero.
releaseunit - ⊞ -
end - The end of the composite operation's effect. The effect reduces to zero again.
endunit - ⊞ -
risefunc - ⊞ - How to interpolate from one CHOP to another. It is the shape of the segment between the Start and Peak indices.
- Ease in
- Ease out
- Ease in Ease out
- Hold Previous
fallfunc - ⊞ - How to interpolate from one CHOP to another. It is the shape of the segment between the Release and End.
- Ease in
- Ease out
- Ease in Ease out
- Hold Previous
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 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.
The term "Frame" is used (1) in the Timeline, (2) as a time-unit in CHOPs, (3) as a time-unit in TOPs, and (4) with movies images which are read and created with TOPs.
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.
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'.