Grasshopper

algorithmic modeling for Rhino

I have a surface on which I've generated curve polygons. On these polygons I have to get an offset toward inside (after flatten) in order to have some space between. Logically I use flip normals with guide curve the boundary of my initial surface but still few amount of polygons are flipped oppositely.
Do you have any suggestion how to uniform all normals?
Thank you

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Ops. My grasshopper is from 2014. I'll upgrade now and try again.

I can't get newer than Grasshopper WIP (0.9.0076) (08/27/2014)

FIXED somehow

I had to keep POPGEO to generate lower amount of points and multiply POPGEO itself to rich the total number of points.

I left a couple of disabled groups to show:

  1. how to use 'Disc' and 'Avr' to get the center point of each polygon.
  2. how to use 'Srf CP' and 'EvalSrf' to get the "surface normal" vector/frame/plane for each polygon.
  3. how to use 'Scale' instead of 'Offset'.

But all fail for different reasons, mainly due to 'Offset' defects.

Best results will be obtained using 'Clipper': http://www.food4rhino.com/app/clipper-grasshopper

P.S.  You may want to 'Pull' the offset polygons to the surface...?

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Thank you Joseph,

I've managed somehow with POPGEO. Very fragile project! The smaller the cells become the more they follow the surface curvature the harder to deal with their normals afterwards. To this surface I needed about 1600 flat polygons.. Anyway I have managed somehow this time too ;)

thanks

ps. I'll check Clipper!

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