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This CHOP creates cycles. It can repeat the channels any number of times before and after the original. It can also make a single cycle have a smooth transition from its end to its beginning, so it loops smoothly.
Since channels may not naturally loop well, the Cycle CHOP provides three different methods of blending between the cycles.
The number of cycles to loop before the input CHOP. This parameter can be fractional.
The number of cycles to loop after the input CHOP. This parameter can be fractional.
If on, consecutive cycles are mirror images (reversed) of one another. The first cycle is never mirrored.
Blend Start to End
If on, the end of the CHOP is blended into the start of the CHOP to produce a smooth loop. If Cycles Before and Cycles After are 0, Region is non-zero, and Extend Conditions are "Cycle", it loops smoothly forever.
How to blend between cycles.
Keeps the total length of each cycle the same as the length of the input CHOP.
Overlaps each cycle with with the previous cycle.
Insert Blend Region
Inserts a region between the cycles where blending is done.
The shape of the blending function.
Smooth on entry.
Smooth on exit.
Ease in Ease out
Smooth on entry and exit.
For Insert Blend Region, cubic interpolation fills the region between the cycles.
The overlapped region has the overlapping samples simply added.
The size of the blend region, in either seconds, samples or frames (set in "Units" in the Common page).
The bias of the blend. -1 biases the blend toward the beginning, 0 is no bias and +1 biases towards the end.
If set to 1, the next cycle will be shifted in value up or down so that it begins where the last cycle ended. Suitable for root object of walk cycles.
The names of those channels that will be affected by the Step parameter.
Some of these parameters may not be available on all CHOP nodes.
To determine which channels get affected, some CHOPs have a scope string. Patterns can be used in the scope, for example
* (match all), and
? (match single character).
The following are examples of possible channel name matching options:
Matches a single channel name.
chan3 tx ty tz
Matches four channel names, separated by spaces.
Matches each channel that starts with
Matches each channel that has
foot in it.
? matches a single character.
t? matches two-character channels starting with t.
Matches number ranges giving
[xyz]matches three characters, giving channels
Sample Rate Match
The Sample Rate Match Options handle cases where multiple input CHOPs’ sample rates are different.
Resample At First Input’s Rate
Use rate of first input to resample others.
Resample At Maximum Rate
Resample to highest sample rate.
Resample At Minimum Rate
Resample to the lowest sample rate.
Error if Rates Differ
Does not accept conflicting sample rates.
The units for which time parameters are specified.
For example, you can specify the amount of time a lag should last for in seconds (default), frames (at the Houdini FPS), or samples (in the CHOP’s sample rate).
When you change the Units parameter, it does not convert the existing parameters to the new units.
Time Slicing is a feature which boosts cooking performance and reduces memory usage. Traditionally, CHOPs calculate the channel over its entire frame range. If the channel does need to be evaluated every frame, then cooking the entire range of the channel is unnecessary. It is more efficient to calculate only the fraction of the channel that is needed. This fraction is known as a Time Slice.
Causes the memory consumed by a CHOP to be released after it is cooked and the data passed to the next CHOP.
The Export prefix is prepended to CHOP channel names to determine where to export to.
For example, if the CHOP channel was named
geo1:tx, and the prefix was
/obj, the channel would be exported to
You can leave the Export Prefix blank, but then your CHOP track names need to be absolute paths, such as
Every CHOP has this option. Each CHOP gets a default color assigned for display in the Graph port, but you can override the color in the Common page under Graph Color. There are 36 RGB color combinations in the Palette.
Graph Color Step
When the graph displays the animation curves and a CHOP has two or more channels, this defines the difference in color from one channel to the next, giving a rainbow spectrum of colors.
This example demonstrates how the Cycle CHOP seamlessly loops input channels. The Cycle is customized by setting the amount of repetitions before and after the input channel, and by setting up the orientation.
The following examples include this node.