Lookup channel node

Uses a channel in the first input to index into a lookup table in the second input, and…

This chop uses a channel in the first input to index into a lookup table in the second input, and output values from the lookup table. The first input is the Index input, and should contain a single channel to use as an index reference. The second input is the Lookup Table, and can contain any number of channels.

A 0 to 1 in the Index range means that a 0 in the Index (first) input maps to the beginning (left) of the lookup table, and 1 in the Index (first) input maps to the end (right) of the lookup table (second input).

The output chop is the same length as the Index input. It is the same number of channels as the Lookup Table input, and has the same channel names as the Lookup Table input. The output is filled with the data extracted from the lookup tables. Indexes that fall between two lookup table samples are interpolated. The lookup table can be sampled outside its range. The Extend Conditions are used in this case.

The sample rate of the output is the sample rate of the Index input.

The Lookup chop can be used to fetch values from a color lookup table, where a single index produces red, green and blue channels. It can also be used for rolloff or decay tables, where it specifies how much a parameter drops with distance.