Flip normals with guide curve

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

Attachments:

Flip normals problem.3dm, 6.4 MB
Mirrors GH flip normals problem.gh, 8 KB

Replies to This Discussion

Permalink Reply by Aleksandar Dimitrov on October 9, 2017 at 1:16am

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)

Permalink Reply by Aleksandar Dimitrov on October 9, 2017 at 8:06am

FIXED somehow

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

Permalink Reply by Joseph Oster on October 9, 2017 at 8:06am

I left a couple of disabled groups to show:

how to use 'Disc' and 'Avr' to get the center point of each polygon.
how to use 'Srf CP' and 'EvalSrf' to get the "surface normal" vector/frame/plane for each polygon.
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...?

Attachments:

MirrorsGHflipnormals_2017_Oct9a.gh, 2.1 MB

Permalink Reply by Aleksandar Dimitrov on October 9, 2017 at 10:18am

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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