Curve length from point or parameter?

What I would like to do is be able to query the length along a curve from a point on that curve back to the start (or end) point. I thought there would be a component that acts like the reverse of the Evaluate Length component, but I can't find it.

How would this best be done for one or multiple points?

Thx, --Mitch

Replies to This Discussion

Permalink Reply by Chris Tietjen on May 14, 2011 at 5:02am

The upper definition uses a GH point which you can move along the curve and the lower definition uses an instantiated point from Rhino.

Chris

Permalink Reply by Mitch Heynick on May 14, 2011 at 10:24am

Hi Chris,

SubCrv was one of the ways I was looking for and had not found it - I was looking in the wrong place - thanks for the reminder. Still seems like a lot of components needed to get this data though...

--Mitch

Permalink Reply by taz on May 14, 2011 at 2:26pm

Mitch,

For your consideration...

Permalink Reply by Mitch Heynick on May 15, 2011 at 2:21am

Ahh, Evaluate Curve has a length to start output... That's really what I had been looking for from the beginning, and somehow I didn't find it... Thanks taz! Oh, and thanks too for reminding me that you can reparameterize the curve inside the component...

--Mitch

Permalink Reply by Pieter Segeren on May 14, 2011 at 5:11am

Hi Mitch, Chris, this is what I would do:

Permalink Reply by Chris Tietjen on May 14, 2011 at 5:28am

Nice!

Chris

Permalink Reply by Mitch Heynick on May 14, 2011 at 9:30am

Yessss, but....

The parametrization of a curve does not necessarily correspond 1:1 with its length - except where the curve is a straight line... So you can't just multiply the parameter of the point on the curve with the overall length... Also if the parametrization is other than 0 to 1, this will not work...

Attachments: