Checkerboard Problem

I was trying to create an extruded checkerboard pattern on a surface an ran into an interesting (well, for someone who doesn't program) problem. If the board had an odd number of rows/columns, checkerboarding was easy, just cull the evens or the odds. However, if there was an even number of rows or columns, you would have to alternate evens/odds per row.

I eventually figured it out in a somewhat roundabout way and figured I'd post it here to see if anyone had a better way of doing it.

Attachments:

checker grasshopper.png, 537 KB
surface checkerboarder.ghx, 304 KB

Replies to This Discussion

Permalink Reply by Daniel Piker on May 9, 2011 at 9:03pm

simplest way is to use the modulo operator
(x+y)%2 gives a checkerboard pattern of 1 and 0

Attachments:

Checkerboard.ghx, 95 KB

Permalink Reply by Arlen Abraham on May 11, 2011 at 4:42pm

Brilliant! I need to work on the whole cross/longest/shortest thing.

Permalink Reply by Jon Mirtschin on May 9, 2011 at 10:02pm

You might be interested, I added some similar functionality to StructDrawRhino for arbitrary grids of curves for Arthur and Ognek last year, you'll find the definition here: http://www.grasshopper3d.com/group/geometrygym/forum/topics/request...

Permalink Reply by Caglar on May 10, 2011 at 1:21am