Surface Cell Offset Issue

Hey guys I'm new to grasshopper and I am trying to subdivide a surface into various cells and then take the edges of each rectangular cell, join them, then create an offset curve. The offset curvature is successful but does not result in a closed rectangle. Therefore, my offset rectangles end up being four lines that just overlap after being offset. I appreciate any help/explanations you can provide. Thank You!

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Permalink Reply by Joseph Oster on June 16, 2017 at 5:16pm

You didn't internalize your 'Brep' parameter.

Permalink Reply by Eric Dell'Orco on June 16, 2017 at 5:18pm

Ah! Sorry here you go!

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BoxModule_ED_fixed.gh, 8 KB

Permalink Reply by Joseph Oster on June 16, 2017 at 5:42pm

Maybe someone else can explain why 'Offset' fails? But 'Scale' works, so why bother with 'Offset'?

Neither 'Scale' nor 'Offset' will keep their results on the base surface though (white curves), which you need if you want to split the surface. You can use 'Pull' to get a similar effect though (blue curves):

P.S. 'SrfSplit' is VERY SLOW so you should disable it until you've adjusted the scale factor.

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BoxModule_ED_2017Jun16a.gh, 13 KB

Permalink Reply by Joseph Oster on June 16, 2017 at 6:07pm

A week ago, David Rutten suggested the Clipper plugin for offset:

http://www.grasshopper3d.com/forum/topics/we-need-to-talk-about-off...

http://www.food4rhino.com/app/clipper-grasshopper

Permalink Reply by Joseph Oster on June 16, 2017 at 6:25pm

I just tried the Clipper plugin and, as far as I can tell, it doesn't work with negative values?

So it only expands polyline curves and doesn't shrink ("inset") them?

Permalink Reply by Bum Bumaye on June 17, 2017 at 3:56am

the plugin does the offset in both direction, this is why you have two outputs of the ofset component. C and H. The H output would be the offset with the negative value.

its a very sweet plugin and really fast.

Permalink Reply by Joseph Oster on June 17, 2017 at 6:25am

Oh! I missed that, thank you. Yes indeed, it works beautifully and is fast. 'Pull' to surface is still required, of course:

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