extract isocurves from surface

Replies to This Discussion

Permalink Reply by andrea amelio on January 22, 2010 at 5:36am

;)

Attachments:

• extract isocurve.ghx, 145 KB

Permalink Reply by gennaro senatore on January 22, 2010 at 6:01am

hello andrea,

thanks for you definition,
sorry but I was referring to an sdk method such as .IsoCurve() or similar and the way it can be implemented using a c# or vb component in grasshopper

Permalink Reply by David Rutten on January 22, 2010 at 6:02am

Hi Gennaro,

are you looking for isocurves which are trimmed by surface edges, or merely isocurves which run across the entire surface?

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by gennaro senatore on January 22, 2010 at 6:07am

can you point help for both fo them, it might turn to be very usefull to have them trimmed by surface edges later on....

I do not have a regular spacing, I've got array or list with specified uv coordinates (or points coordinates) at which I need to extract the isocurves
basically same stuff that you do with the rhinoscript method "extract isocurve"

thanks

Permalink Reply by David Rutten on January 22, 2010 at 6:12am

Well, IOnSurface.IsoCurve() is definitely the method you need. You can get both the U and the V isocurve at a given uv-coordinate.

If you need curves that are aware of surface trims, you cannot use IOnSurface at all, you have to start using BReps. There is a GetWireFrameCurves() method on MRhinoBrepObject, but it will be difficult to determine which curve you need.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by gennaro senatore on January 22, 2010 at 7:02am

thanks David,

would you be that kind to provide a short example that shows how to work with IOnsurface, when interfaces comes to play I'm still kind of not confident

thanks in any case

Permalink Reply by gennaro senatore on January 22, 2010 at 7:11am

sorry again,

would it be possible to access to rhinoscript methods within grasshopper script components ?

I tried to add as assenbly the rhinoscript.tlb file but obviously it did not work....

Permalink Reply by Luis Fraguada on January 22, 2010 at 8:38am

rhinoscript methods are not, afaik, available in a GH .net component.

Permalink Reply by gennaro senatore on January 22, 2010 at 2:54pm

right,

that was easier that I thought,
basically the method IOnsurface.Isocurve() gives back directly a OnCurve which is an abstract class
so it can not be instantiated which means that we have to plug OnCurve from the outside as an input
and use also as output

if this is not clear have a look at the definition

thanks for you help

Attachments:

• isocurve sdk.ghx, 35 KB

Permalink Reply by Giulio Piacentino on January 23, 2010 at 6:04am

Hi Gennaro,

you can also directly declare the local variable inside the method. Have a look at this definition - it has two examples.

- Giulio

Attachments:

• isocurvesdk2.ghx, 47 KB

Permalink Reply by gennaro senatore on January 23, 2010 at 6:46am

hey many thanks Giulio,

this is pretty amusing,
I did exactly the same yesterday and got exception of protected member, such as Oncurve could not be accessed..... I must have done some mess though because in your definition is working....

thanks

Permalink Reply by gennaro senatore on January 23, 2010 at 7:01am

I think I put the word "new" before Oncurve, which caused the exception because OnCurve cannot be instantiated.....

thanks again