probably basic polyline offset problem

Replies to This Discussion

Permalink Reply by David Rutten on June 7, 2011 at 5:25am

Hi Lucas,

 

I can see the problem but no solution. I'll keep thinking about this but it may require some custom VB/C# coding to consistently eliminate the unwanted points.

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Lucas Corato on June 7, 2011 at 6:07am

Wow, and I thought it was a simple problem...! So please let me know if you find a solution.

Thanks a lot for your time!

Regards,

LUCAS

Permalink Reply by Dedackelzucht on June 7, 2011 at 6:10am

Not exactly, but maybe something close:-)

Attachments:

• 110706lucascorato_offest_DeDackel.ghx, 291 KB

Permalink Reply by Lucas Corato on June 7, 2011 at 6:25am

Wow again, thanks Dedackel!

It's the most complex offset I've ever seen, but it gets the job done.

Unfortunately when I use it on the file I'm working (much larger than that example I sent before) I still have unwanted points. And I can't apply the solution to several curves, they connect together strangely.

But I'll try to make the necessary modifications, as soon as I can completely understand your definition.

Thanks again for your time and effort!

Regards,

LUCAS

Permalink Reply by Dedackelzucht on June 7, 2011 at 6:30am

mh, ok!? I am quiet sure there are possipilities to make my definition easier. But I can not spent more time on it right now, sorry. In the end it is not very complex. By the way. the Points you get with my version... at the end ther are to many. I guess there are duplicates or somthing like this.

 

Best Regards

DeDackel

Permalink Reply by Lucas Corato on June 7, 2011 at 6:34am

Don't worry, you've already helped a lot!

Yes, I saw the duplicate points too, and maybe that's why it doesn't work well on my file.

Thanks again and regards,

LUCAS

Permalink Reply by Peter Mehrtens on June 7, 2011 at 6:57am

Hi Lucas,

 

in my lunch time, I made this quick definition with out of the box components.
It makes polyLines out of every set of three sequential control points of the offset curve.

Then it filters for the Line-like segments and pulls their 2nd control point to the offset curve.

By Splitting the offset curve and rejoining the segments you get your control points along the line segment back.

 

Cheers

Peter

Attachments:

• offset polyline maintaining break points at kink-free joints_gh8_0010.ghx, 248 KB

Permalink Reply by Dedackelzucht on June 7, 2011 at 7:05am

Are the ControlPoints the same as the CurveCPs? I didn´t know that. I thought thy behave more like a t value on the new Curve!? Anyway good solution!

 

DeDackel

Permalink Reply by Lucas Corato on June 7, 2011 at 8:40am

Hi Peter!

Amazing job, seems to work very well with curves with low curvature! I'll give it a try and let you know!

Thanks a lot!

LUCAS

Permalink Reply by Yoann Mescam (Systemiq) on June 7, 2011 at 7:55am

As you are working on a polyline, using the Discontinuity component is probably good enough to recreate a clean offset curve.

There are still one or 2 unnecessary control points though, weird.

Permalink Reply by Lucas Corato on June 7, 2011 at 8:27am

Thanks Systemig,

But I guess the combo "discontinuity + polyline" is equivalent to a "simplify curve alone" isn't it? That way I'd lose the points on the flat segments I need aftwerwards, am I right?

Thanks again,

Regards,

LUCAS

Permalink Reply by Yoann Mescam (Systemiq) on June 7, 2011 at 12:40pm

Oops indeed, this should work better.

But other helpers probably have suggested something similar.

Attachments:

• 110706lucascorato_offest.ghx, 172 KB

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