Offset Inward a Closed Curve

Hi, is there anybody realized there is a bug for the Offset Tool component in the latest version of GH 0.8.0003. I can't input negative value for the offset distance (when input negative value to the Distance input the Offset component turns red), so it's impossible to offset a closed curve inward.

I tried to reverse the plane, but still doesn't work, the offset is always outward.

It's a bug or my own computer problem?

Jinge

Attachments:

Untitled.jpg, 331 KB

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 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 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 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 Michal Dengusiak on January 17, 2013 at 4:05am

Thanks for your hint. I am aware of this function but this does not work. This provides some strange results.

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