How to eliminate duplicated points on curves

Hi, guys, being a newbie to grasshopper, I need u help desperately because recently I met a problem about duplicated points which are preventing a perfect solution of Fillet function.

The real problem is that the generation of my curves are through the function of "Region Difference" or "Solid Difference", after feeding them with rectangles and curves, they always generate duplicated points at certain corner of the resulting curves, thus these corners won't be correctly calculated for Fillet. As shown in the attached pic.

So wanna ask does anybody know how to get rid of those duplicated point and can still maintain the correct curves?

Attachments:

wavy facade exercise.gh, 16 KB
wavy facade excercise.3dm, 79 KB

Replies to This Discussion

Permalink Reply by Raul Matagringo on January 4, 2013 at 5:17am

Permalink Reply by Archviator on January 4, 2013 at 8:57am

hi, thx for the hint, Raul, nice to find ur reply so quickly, the "dupPts" could be the best way to eliminate duplicated pts. However I am just wondering after the component returns me a bunch of pts., how should I use them to reconstruct the original polyline in my case?

Permalink Reply by Michael Pryor on January 4, 2013 at 8:58am

Gh has a better cull duplicates component. I dont have rhino 5 so I cant open your 3dm.

Permalink Reply by Archviator on January 4, 2013 at 9:10am

Hi, thx, Michael, really? Can u show me? I am uploading a Rhino4 file now.

Attachments:

wavyfacadeexcercise.3dm, 81 KB

Permalink Reply by Archviator on January 4, 2013 at 9:31am

Yeah I found that component, it totally works! Yeah, so with unnecessary points gone, what's next?

Permalink Reply by Raul Matagringo on January 4, 2013 at 9:38am

you can join your curves

Permalink Reply by Archviator on January 4, 2013 at 9:58am

yeah, sure, but in my case, I have curves as well as straight lines. The biggest challenge is to get back those curves. I really have no clue about that, honestlyy.

Permalink Reply by Michael Pryor on January 4, 2013 at 10:51am

the problem isnt duplicate points. you are creating dup points by exploding the curve. This is not necessary. I think the problem is either with circle seams or curve direction but I have no time to investigate now.

Permalink Reply by David Rutten on January 4, 2013 at 1:27pm

It's not duplicate points at all, what you have are curves with some very short segments. This causes two kinks to appear very close together which in turn messes with the fillet logic. These nearby kinks arise when you cut your circle union with the rectangle. The circles don't exactly line up because you Round the radii, if you remove the Round component the file seems to work as expected.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Archviator on January 4, 2013 at 8:27pm

Well, thank u, David! U r absolutely right! That explains everything, I juiced up every radius just a little bit, and they are all instantly filleted. So that means the Boolean components are correct, they didn't generate any duplicated pts., I did. However, is there any component that could directly delete duplicated pts. on curve? Just wondering.

Permalink Reply by Michael Pryor on January 4, 2013 at 9:28pm

Cull duplicates.

Permalink Reply by David Rutten on January 5, 2013 at 1:41am

If the curve is a polyline, then yes you can remove short segments. It doesn't work for nurbs curves or polycurves though. Also note that when you remove a short (but non-zero-length) segment from a polycurve like this the two segments that now meet will be deformed slightly, so they'll no longer be circles. True duplicate vertices on a curve should get fixed with the [Simplify Curve] component.

An alternative approach would be to explode the curve, remove all short/line segments and string the rest back together again. This will shorten the curve as a whole but it will keep arcs intact.

David Rutten

david@mcneel.com

Poprad, Slovakia

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