I'd just let the for loops produce the whole grid and put the "if" in the innermost place. It would then say if ( (col_counter % 4 != 0) && (row_counter % 4 != 0 ) ) Msquare On Thu, 29 Dec 2022 at 00:52, fred via Discuss <discuss@lists.openscad.org> wrote: > > > > ---------- Forwarded message ---------- > From: fred <fred_dot_u@yahoo.com> > To: OpenSCAD general discussion <discuss@lists.openscad.org> > Cc: > Bcc: > Date: Wed, 28 Dec 2022 23:51:58 +0000 (UTC) > Subject: [OpenSCAD] It's logical? > I'm able to generate an array of objects, 9 x 9 translating the desired > distances, by using a pair of nested for loops. Conveniently centered, the > 81 items appear as expected. > > thick = 5; > pin = 1; > base = 5; > > x_spacing = 15; > y_spacing = 20; > > module pocket(){ > cylinder(h = thick, r1 = pin, r2 = base); > } > > module pockets(){ > for (col_counter = [-4 : 1 : 4]) > //if (col_counter % 4 != 0) > for (row_counter = [-4 : 1 : 4]) > translate([col_counter * x_spacing, row_counter * y_spacing, > 0]) > pocket(); > } > pockets(); > > [image: Inline image] > > > The commented line does not behave as I'd like, but it does behave as > expected, removing the center column and the outer columns. It's an easy > matter to reposition the conditional and vanish the rows instead of the > columns, but my objective is different. > > [image: Inline image] > > [image: Inline image] > > [image: Inline image] > > > > I'd like to combine the if (col_counter % 4 != 0) and the if (row_counter > % 4 != 0) in such a way as to remove only the center pocket() and the > corner pocket()s and the edge-centered pocket()s. > > I'm not sure of the logic necessary to get only those nine locations > ignored/skipped over/bypassed. > > [image: Inline image] > This image above was created with a graphics editor and represents the > objective. > These pocket()s will be subtracted from a larger monolith and the "blank" > spots will have other shapes subtracted, in a less challenging approach, I > hope. > > > Is there an if-statement using boolean operators that will exclude the > mod_4 locations that can be nested in the loops? > > > > > > ---------- Forwarded message ---------- > From: fred via Discuss <discuss@lists.openscad.org> > To: OpenSCAD general discussion <discuss@lists.openscad.org> > Cc: fred <fred_dot_u@yahoo.com> > Bcc: > Date: Wed, 28 Dec 2022 23:51:58 +0000 (UTC) > Subject: [OpenSCAD] It's logical? > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >