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This CHOP delays the input, and can be run in normal or time-sliced mode. Like an echo, it delays the input and applies a gain (multiplier). The input may be copied up to four times, each copy with its own delay and gain. The copies are layered onto the output track by adding them together. The Delay CHOP can be used to create echoes, with a bit more control over the delay time and gain than the Parametric EQ CHOP.
It also has the Remainder option of the Copy CHOP when in normal mode, which determines with extending the out put of the CHOP or not.
This CHOP may be time-sliced by enabling the Time Slice flag in the Common page.
Number Of Copies
The number of times the input channel is copied. Each copy has its own delay and gain, and the output channel is the sum of these copies.
What to do with samples that are delayed beyond the end of the input clip’s interval.
Keep the output clip the same length as the input.
Make Output Longer
Extend the output channels to fit all delayed samples.
Mix Remainder to Beginning
Add the remaining samples to the samples at the start of the channel.
The delay of each copy. This is expressed in Units, as set on the Common page.
The gain, or scale, of each copy.
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.
Current channel index.
Total number of channels.
This example demonstrates how the Delay CHOP copies and layers input channels. The Delay (timing) and Gain (Scale) values of each copy are added together to output a single channel.