How do I create a point on a line/curve that can be moved anywhere along the line/curve?

Hi,

I'm picking up grasshopper and have gone through many tutorials now, but something I am struggling to do seems to me like it should be quite simple. Basically, I am wanting to create a point on a line or a curve, and then use a slider of some sort (number slider maybe?) to move the point along the line or curve. Is this possible in Grasshopper? If so any help on this would be appreciated

Thanks

Lee

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Permalink Reply by brendon_carlin on September 2, 2010 at 10:48am

Hey Lee

grasshopper is perfect for this. i attached an example. good luck

Attachments:

slide curve params.ghx, 40 KB

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Permalink Reply by Lee Hardy on September 2, 2010 at 11:24am

Great stuff, thanks Brendon however I coulnt open the file, there were components missing from it so I assume we are using different GH versions. I did however manage to get something created bu creating my curve in Rhino, within GH i then set my curve in rhino to a curve parameter, fed this curve into a curve\analysis\point on curve, fed this result into a Point parameter and hey presto it moved along the curve using the point on curve slider!

Thanks again

Lee

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Permalink Reply by Danny Boyes on September 2, 2010 at 11:52am

There are three components that you should have a look at for this.

Evaluate Curve = Point on a curve based on the Domain. (Not always 0 to 1)

Evaluate Length = Point on a curve based on the Length Factor or the actual measurement.

Curve Point = Basic version of Evaluate Length giving a Point on the curve based solely on the Length Factor. This component combines the slider into it already

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Permalink Reply by MARIO VERGARA on September 2, 2010 at 11:45am

another way

Attachments:

evaluate curve.ghx, 23 KB

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Permalink Reply by Lee Hardy on September 2, 2010 at 3:14pm

Thanks for the replies on this, some really useful info! On a side note, I have a new problem stemming from this which I have posted here if you would be kind enough to help? Thanks

http://www.grasshopper3d.com/forum/topics/how-can-i-remove-a-section