from the guide [TABLE="class: table"][TR="class: row"][TD="class: entry"]geometric repetition [/TD][TD="class: entry, width: NaN%"]creates repetition using only the geometry (faces and edges) of the functions, rather than repeat and resolve each instance of the function. geometric repeat option accelerates the creation and regeneration of repetition. It is impossible to create geometric repetitions of functions that have faces combined with the rest of the part.[/TD][/TR][/TABLE]