Offset Inward a Closed Curve

Replies to This Discussion

Permalink Reply by David Rutten on November 30, 2010 at 3:29pm

Hi Jinge,

can you post the curve that fails to offset?

--
David Rutten
david@mcneel.com
Seattle, WA

Permalink Reply by Jinge Chai on November 30, 2010 at 9:30pm

Hi, David,

I have solved the problem by VB Script, using curve.offset.

But the offset component of Grasshopper is just weird, sometimes only positive offset distance works, sometimes only negative values. And I find I can use the same GH file in Rhino 4 to offset to both sides by setting positive and negative distances.

I uploaded both Rhino 5 and GH files.


Thanks.


Jinge

Attachments:

• offset.3dm, 2.6 MB
• offset.ghx, 86 KB

Permalink Reply by Jinge Chai on November 30, 2010 at 9:38pm

And by the way, my rhino has been suffering a start up error warning "failed to create instance of VBScript scripting engine". Everything in rhino seems fine except for the Rhino Script Editor and Run Script. I don't know when this happened because I ran some rhinoscripts one or two months ago. I found a page about this on rhino3d, but I folllowed their methods, not working for me.

And I also have the testerrorcheck problem, it always shows up and I need to set the errorchecking CommandErrorsDialog off every time I open a saved file.

They are not GH problems, but wondering if you know something.


Thanks.

Permalink Reply by Paul Wintour on April 11, 2011 at 10:27am

Yes I am having the same problems. Works fine for a positive offset but doesn't like it when it is negative.

 

Jinge, can you post you VB Script, using curve.offset please.

Permalink Reply by Jinge Chai on April 12, 2011 at 10:10am

Sorry Paul,

I didn't visit this forum for quite a long time. I almost forget about it. I'm travelling and I don't have the script by my side now, I will try do find it later.

 

Jinge

Permalink Reply by Will Krzymowski on April 12, 2011 at 3:23am

I'm having trouble with negative offset values. Closed triangular curve only offsets in positive direction.

Permalink Reply by Paul Wintour on April 12, 2011 at 4:11am

David

Can you have a look at the Offset curve command in GH 0.8.0007. It appears to be totally up the duff.

The component is totally unpredictable. Using the same method (a simple referenced rhino rectangle) some times it offsets in the positive direction, and other times in the negative direction (using the same offset value). Other times, it does't offset in one direction. I though it might be a tolerance or unit issue in the rhino file but it all appears to be fine. Frustrating!

Permalink Reply by Danny Boyes on April 12, 2011 at 4:24am

The latest answer: http://www.grasshopper3d.com/forum/topics/offset-help?commentId=298...

Hopefully David is very nearly ready to release the next version.

Permalink Reply by Michal Dengusiak on January 15, 2013 at 5:09am

Hi,

I am trying to offset curve  inward along a surface so can create Windows and run Energy Plus. I did it successfully for one wall but got an error when doing for another. I would appreciate any help.

Erorr: curve offset failed

Attachments:

• D26_MD.gh, 3 KB
• D26__MD.3dm, 274 KB

Permalink Reply by Paul Wintour on January 15, 2013 at 8:10pm

HI Michal

What version of Grasshopper are you using? I'm on 0.8.0066 and it is working for me with your geometry. I know that for previous versions the offset curve component wasn't working properly.

Attachments:

• OffsetCrv.gh, 2 KB

Permalink Reply by Michal Dengusiak on January 16, 2013 at 3:47am

Hi,

I am using Rhino 4 and Grasshopper 0.9.0014. I tested your approach with Wires instead of edge and seems to work. This means that works better wires ...thanks for help

Ps. Is there any way I can do all wall at the same time or need to do each separately?

Permalink Reply by Paul Wintour on January 16, 2013 at 8:24pm

Yep - when you right click on the surface geometry component ('Brep wall_windows') select 'Set multiple surfaces' instead of 'set one surface'.

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