Import Select CHOP
The Import Select CHOP is used to specify CHOP channels from an importing file such as FBX COMP or USD COMP. One of the main purpose of these channels is to represent the changes of transformation of different primitives or the state of some dynamic features of importing file. The Import Select CHOP can have its own animation controls within the Play page or use the settings from its parent COMP.
Parameters - General Page
parent - Specify the import parent (eg. USD/FBX COMP) to search for the asset. When no COMP is specified it will by default search in the first import parent in its path.
taketype - ⊞ - Select between playback of an animation or a blend shape.
- Blend Shapes
blendshape - Specifices the blend shape name (if any is specified) from the importing file that this CHOP will playback.
reload - Reloads the asset from the import parent.
Parameters - Playback Page
Use Parent Animation
useparentanim - A toggle to specify whether to use the parent COMP animation controls or have a custom setting for this SOP.
animation - Specifices the animation name (if any is specified) from the importing file that this CHOP will playback.
Shift Animation Start
shiftanimationstart - A toggle to specify whether to shift the animation to the start of animation indicated in the importing file.
Sample Rate Mode
sampleratemode - ⊞ - Select between using the 'File FPS' embedded in the FBX file or setting a 'Custom' sample rate.
- File FPS
filefps- uses the FPS from what is defined in the importing file.
custom- a desired value specified by Sample Rate parameter.
samplerate - Set the sample rate when the "Sample Rate Mode" parameter above is set to 'Custom'.
playmode - ⊞ - A menu to specify the method used to play the animation.
- Locked to Timeline
lockedtotimeline- This mode locks the animation position to the timeline. The parameters Play, Speed, Index, Cue and Cue Point, are disabled in this mode since the timeline is directly tied to animation position.
- Specify Index
specifyindex- This mode allows the user to specify a particular index (position) in the animation using the Index parameter below. Use this mode for random access to any location in the animation.
sequential- This mode continually plays regardless of the timeline position (the Index parameter is disabled). Play, Speed, Cue, and Cue Point parameters below are enabled to allow some control. The default is set to this value.
- Output Full Range
index - This parameter explicitly sets the animation position when Play Mode is set to Specify Index. The units’ menu on the right lets you specify the index in the following units: Index, Frames, Seconds, and Fraction (percentage).
indexunit - ⊞ - Specifies a unit type for Index. Changing this will convert the previous unit to the selected unit.
play - A toggle that makes the animation to play when it sets to ON. This Parameter is only available/enabled if the Sequential mode is selected from the Play Mode.
speed - This is a speed multiplier which only works when Play Mode is Sequential. A value of 1 is the default playback speed. A value of 2 is double speed, 0.5 is half speed and so on.
trim - A toggle to enable the Trim Start and Trim End parameters.
tstart - Sets an in point from the beginning of the animation, allowing you to trim the starting index of the animation. The units’ menu on the right let you specify this position by index, frames, seconds, or fraction (percentage).
Trim Start Unit
tstartunit - ⊞ - Specifies a unit type for Trim Start. Changing this will convert the previous unit to the selected unit.
tend - Sets an end point from the end of the movie, allowing you to trim the ending index of the animation. The units’ menu on the right let you specify this position by index, frames, seconds, or fraction (percentage).
Trim End Unit
tendunit - ⊞ - Specifies a unit type for Trim End. Changing this will convert the previous unit to the selected unit.
cue - A toggle to jump to Cue Point when it is set to ON and it stays at that position. Only available when Play Mode is Sequential.
cuepulse - When pressed the animation jumps to the Cue Point and continues from that point.
cuepoint - Set any index in the animation as a point to jump to.
Cue Point Unit
cuepointunit - ⊞ - Specifies a unit type for Cue Point. Changing this will convert the previous unit to the selected unit.
textendleft - ⊞ - Determines how the parent COMP handles animation positions that lie before the Trim Start position. For example, if Trim Start is set to 1, and the animation current index is -10, the Extend Left menu determines how the animation position is calculated.
textendright - ⊞ - Determines how the parent COMP handles animation positions that lie after the Trim End position. For example, if Trim End is set to 20, and the animation current index is 25, the Extend Right menu determines how the animation position is calculated.
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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An Operator Family that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.
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.
The frame rate that TouchDesigner's Timeline uses. Equal to the Frames per Second value
The panel at the bottom of TouchDesigner, it controls the current Time of the full system or just one component.
Each SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.
To pulse a parameter is to send it a signal from a CHOP or python or 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 in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in a 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 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.
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'.