some custom uncompressed input format that supports half float, 32-bit float, 1-, 2-, and 4-channel data.
this module supports loading arrays of textures, as for instance required by
the rt module. to do this, pass a filename that points to
a .txt file with one filename per line. the module will then load the lut
files referenced in the .txt file and pass them as an array connector.
filename the input filename substitution will consider "maker" "model" and "flen". pass a .txt file here to load a list of textures (one filename per line in the txt file)output the output data with the corresponding channels