Separator node splits input instances into 2 groups by random selection or by texture filter.

Splitted instances can be modified independently with modifier nodes, like changing material, instances objects, transformation or any other modifications.

Following examples show splitted instances with replaced material.

Percentage option splits instances randomly with specified proportion.

Map option split instances by texture values.
Invert map inverts splitting distribution.

Map threshold sets texture threshold value for splitting.

Map randomness gives texture values randomization for splitting.