Limit CHOP

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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 - - Select limit options such as loop, clamp, or zigzag from the menu. The value will remain in the range from Min to less than Max.

  • 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. See Pattern Matching.

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: -

Info CHOP Channels

Extra Information for the Limit CHOP can be accessed via an Info CHOP.

Common CHOP Info Channels

  • start - Start of the CHOP interval in samples.
  • length - Number of samples in the CHOP.
  • sample_rate - The samplerate of the channels in frames per second.
  • num_channels - Number of channels in the CHOP.
  • time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.
  • export_sernum - A count of how often the export connections have been updated.

Common Operator Info Channels

  • total_cooks - Number of times the operator has cooked since the process started.
  • cook_time - Duration of the last cook in milliseconds.
  • cook_frame - Frame number when this operator was last cooked relative to the component timeline.
  • cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
  • cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
  • cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
  • cooked_this_frame - 1 if operator was cooked this frame.
  • warnings - Number of warnings in this operator if any.
  • errors - Number of errors in this operator if any.

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