Can I change the start point of closed curve?

Hello, I'm using grasshopper 0.7.0057.

Can I change the start point of closed curve, with the specific point?

For example, intersection between surface and curve, or near point on curve.

Replies to This Discussion

Permalink Reply by Danny Boyes on January 20, 2011 at 3:48am

You can do it very easily if you stuck to control points as the start/end but otherwise you wouldn't end up with the same curve if you started introducing points to then be interpolated through.

Permalink Reply by Danny Boyes on January 20, 2011 at 4:47am

attached CP new start. And drop the Very from the previous post as I've used the NurbsCurve component which is not in the version you are using (I don't think)

Viewport showing new start in green near the closest CP to criteria point highlighted in yellow

Attachments:

NewStartCPversion.ghx, 236 KB

Permalink Reply by Dedackelzucht on January 20, 2011 at 3:53am

mh ok danny you have been faster than me :-)

anyway here is a ghx/3dm

Attachments:

starting point changing.3dm, 31 KB
starting point changing.ghx, 80 KB

Permalink Reply by Danny Boyes on January 20, 2011 at 4:52am

Yeah, but i didn't provide any substance :)

Permalink Reply by Dedackelzucht on January 20, 2011 at 4:54am

Therefor yours is much more amitiouse :-)

Permalink Reply by Gabe Krause on January 20, 2011 at 4:21pm

I wanna throw my two cents in!

I just made a relatively simple definition for this a few days ago. If you don't mind having the closed curve normalized, it works great.

I forget if grasshopper 0.7.0057 allows clusters so, I've included a second definition just in case.

Oh, I just realized that this is a slightly different application (slider input for point position). Oh well, here it is anyway.

Attachments:

Adjust Closed Curve Seam.ghx, 135 KB
Adjust Closed Curve Seam old.ghx, 84 KB

Permalink Reply by Jaeman PARK on January 20, 2011 at 6:06pm

Thank you Danny Boyes, Dedackelzucht, Gabriel Krause!

Split and Join... it's really simple but smart! ^^ :)

Gabriel, I modified your definition a little bit, so now it works with the specific point. I like it.

Attachments:

110121_NewStartPtonClosedCrv_00.ghx, 67 KB

Permalink Reply by Jaeman PARK on January 20, 2011 at 7:53pm

the last one.

Attachments:

110121_NewStartPtonClosedCrv_01.ghx, 76 KB

Permalink Reply by Gabe Krause on January 20, 2011 at 11:00pm

Nice upgrade Jamparc.

I'll be using that sometime.

Permalink Reply by Dedackelzucht on January 21, 2011 at 12:27am

Ahhh, using t of crv CP is cool! I like it!

Permalink Reply by Adam Chałupski on May 30, 2011 at 3:25am

Hi Jamparc, i used yr definition few times and it works very good untill i had to apply it in set of differen curves which have to be lofted. SOme how component 'fillet crv at the paimiter' change curve start pt and after all 'loft ' is giveing very crazy shapes.

When I tryed to use Yr definition i turned that only some of my curves have start pt in the desired position. Rest remains at the oryginal position/ I assume that it is becouse 'Join' component is joining subdivided curves in wrong way but i don't know why.

thanks for any help!

Attachments: