Dividing a curve using a base point...

Replies to This Discussion

Permalink Reply by Wietse Elswijk on July 8, 2016 at 5:36am

see attached, you used a point as input for a parameter, thats why it didnt work.

to get the parameter on the curve I used the intersection Curve|Curve(CCX) component.

Attachments:

• MULTICONIC1.gh, 16 KB

Permalink Reply by Guy Whitehouse on July 8, 2016 at 6:37am

Thank you so much!  I should be able to take it from there (my first grasshopper attempt).  Do you think that there there a way of using the intersect point to then divide the line without shattering it?

Permalink Reply by Joseph Oster on July 8, 2016 at 8:19am

This isn't quite the same thing as dividing your chine curve but is more in keeping with traditional boat design.  It creates 'Perp Frames (PFrames)' on the projected chine curve and intersects them with both the chine and keel curves.

NOTE: I internalized the 'V (Vertices)' input parameters so the Rhino file isn't needed.

Attachments:

• MULTICONIC_2016July8a.gh, 12 KB

Permalink Reply by Guy Whitehouse on July 8, 2016 at 9:04am

Thanks Joseph.   I am ultimately not after frames....

I am attempting to do something quite different to what you have drawn  (but good to see more code as I get my head around grasshopper and will probably come in use!);

Cheers

Guy

Permalink Reply by Joseph Oster on July 8, 2016 at 10:38am

OK...  Split the chine curve at your mid-point (many ways to get that!), then divide each half separately by length ('DivLength'), first flipping the direction of one of the halves so they both have their start point at the mid-point.  Of course, this gives duplicate points in the middle and the points are on the half curves instead of the full chine curve - but there are ways of dealing with that:

NOTE: I've been trying to post this reply for over an hour but the forum page wouldn't load.

Attachments:

• MULTICONIC_2016July8b.gh, 11 KB

Permalink Reply by Joseph Oster on July 8, 2016 at 5:34pm

This code actually splits ('Shatter') the chine curve, at the green group.

It offers four different methods for getting the "Base Point", chosen by the 'Value List' in the first red group:

1. Guy Whitehouse (your original method)
2. Perp Frames (my method)
3. Point On Curve (GH component)
4. t-Val (zero to one slider)

"Point On Curve" and "t-Val" allow you to set the base point manually, moving all the points as you move the sliders.

And this code offers two different methods for setting the "Segment Length", chosen by the 'Value List' in the second red group:

1. Manual
2. Computed

"simple problem"?  Right...

Attachments:

• MULTICONIC_2016July8c.gh, 24 KB