# Limit CHOP

## Summary

The Limit CHOP can limit the values of the input channels to be between a minimum and maximum, and can quantize the input channels in time and/or value such that the value steps over time.

Limiting a channel causes all its values to lie within a range. Several different methods are for limiting are listed under the Type parameter description.

Quantizing a channel value snaps its values to the closest allowable value (the "quantized values"). Quantizing methods are: Floor, Ceiling, and Round.

Quantizing a channel index is like quantizing in time, and acts as a sample and hold mechanism. The channel is sampled at a quantized index, and held at that value until the next quantized index at which time the value takes on the input value at that point.

## Parameters - Limit Page

Type `type` - - The type of limit function to use:

• Off `off` - Do not limit the values.
• Clamp `clamp` - Simply cut the channel value off if it is out of the Maximum/Minimum range, and replace it with the Maximum or Minimum limit value.
• Loop `loop` - Continue the channel at the other end of the interval.
• Zigzag `zigzag` - Mirror the values back inside the interval.

Minimum `min` - The minimum value the output channel can have.

Maximum `max` - The maximum value the output channel can have.

Positive Only `positive` - Takes the absolute value of the channel, making all negative values positive.

Normalize `norm` - Scale and offset the channel so that it lies between -1 and +1. The Normalize function does not work with Time Slicing on.

Fix Underflows `underflow` - This will cause extremely tiny numbers to be rounded to 0.

## Parameters - Quantize Page

Quantize Value `quantvalue` - - Selects the quantization method to use:

• Off `off` - No Value quantization is done.
• Ceiling `ceiling` - The Ceiling function rounds a value to the closest quantized value above it.
• Floor `floor` - The Floor quantization function rounds a value to the closest quantized value below it.
• Round `round` - The Round function rounds a value to the nearest quantized value.

Value Step `vstep` - The increment between quantized values.

Value Offset `voffset` - The offset for quantized values, to allow steps to not lie at zero, the default.

Quantize Index `quantindex` - - Selects whether to quantize the index relative to the sample 0, or the start index of the CHOP.

• Off `off` -
• Offset Relative to Start `relstart` -
• Offset Relative to Zero `relzero` -

Step `istep` - The increment between quantized indices, in seconds, frames or samples.

Step Unit `istepunit` -

Offset `ioffset` - The offset for quantized indices.

Offset Unit `ioffsetunit` -

## 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.

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 -

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An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.

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.

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.

An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a command Script, but can be any multi-line text. Tables are rows and columns of cells, each containing a text string.

The location of an operator within the TouchDesigner environment, for example, `/geo1/torus1`, a node called `torus1` in a component called `geo1`. The path `/` is called Root. To refer instead to a filesystem folder, directory, disk file or `http:` address, see Folder.

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'.

TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The Path is simply `/`. A typical path is `/project1/moviein1`.