filterResample node

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This node implements a decimation resampling filter used by the applyTake command to process recorded motion capture data. The attributes of the node are settings which affect the operation of the filter as it is invoked by applyTake. These settings are preserved when the scene file is saved.

The resample filter converts from either uniform or non-uniform timestep input data samples to the specified uniform timeStep. Various time domain filters are available and are specified with the kernel attribute which selects the resampling kernel applied to the incoming data.

**Kernel Values**
100	Pass through: disables resampling
200	Closest sample to output timestamp
300	Linear interpolation between closest samples
400	Box filter: moving average
500	Tent filter: (1 - \|x\|) weighted moving average
600	Gaussian2 Filter: (2^(-2x*x)) weighted moving average
700	Gaussian4 Filter: (2^(-4x*x)) weighted moving average

Notes

This filter is only targeted at decimation resampling -- interpolation resampling is basically unsupported. If your output framerate is much higher than your input frame rate (approximate, as the input timestep is not assumed to be regular) the lirp and tent will interpolate (usually) and the rest will either average, or use the closest sample (depending on the phase and frequency of the input). However this mode of operation is neither supported nor encouraged.

Since the base class inputs (comprising the input and output data and timestamp values) to this node are unconnectable, this node cannot be used in a traditional dependency graph sense.

Node name	Parents	MFn type	Compatible function sets
filterResample	filter	kFilter	kBase kNamedObject kDependencyNode kFilter

Attributes (2)

kernel, timeStep

Long name (short name) Type Default Flags

kernel (kr) enum 600

Kernel to use for the resampling. See table above for enumeration

timeStep (ts) time 0film

Sets the output period in the current time unit. If zero, the period is 1.0 in the current time unit. Note, if the current time units are seconds, or millisecond, this default is likely not to be useful or desirable.