Tween along curve

theoutside · October 3, 2013, 7:54pm

Dale at mcneel wrote this cool script for tweening down a curve.

make a path, make a start curve and a different shaped end curve and >poof< tween along a curve!

command ‘ArrayCrvTween’

download and drag and drop to a rhino window to load-

-kyle
www.theoutside.biz

enjoy! ArrayCrvTween.rvb(4.2 KB)

dale · October 4, 2013, 4:20pm

Here is a permanent link:

github.com

mcneel/rhino-developer-samples/blob/6/rhinoscript/ArrayCrvTween.rvb

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ArrayCrvTween.rvb -- October 2013
' If this code works, it was written by Dale Fugier.
' If not, I don't know who wrote it.
' Works with Rhinoceros 5.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Option Explicit

' Public variable for "sticky" number of items
Public g_nItems

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' "Tweens" two curves along a path curve
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Sub ArrayCrvTween()
	
	' Declare local variables
	Dim strCurve0, strCurve1, strPath, nItems
	Dim arrParams, arrFrame, arrTangent, arrOrigin
	Dim arrPlane0, arrPlane1, arrCenter

This file has been truncated. show original

cosmas · October 7, 2013, 1:38pm

Greetings Kyle, @theoutside and @dale

This is intriguing but I am wondering if you can give us an example of how to use it?

Thank you.

theoutside · October 7, 2013, 9:10pm

Off the top of my head, start with a circle at one end of a curve and a rounded rectangle at the other end of a curve, tween along curve between them and then loft the result with history…use it to make a cool handle for a tool or something like that. adjust the curves in between to sculpt the loft with history- can use to to create a smooth shape that would be tough to lay out by hand-

cosmas · October 7, 2013, 9:17pm

thank you

C0lin · January 25, 2019, 6:30am

Hello!
Thanks so much for this script. I’m having some difficulty tweening correctly, hopefully, one of you may be able to troubleshoot with me. I’m attempting to tween the two blue rectangles along the orange curve. It’s subtle, but as you can see, the blend is not correct. Am I missing something obvious here?

dale · January 25, 2019, 9:09pm

@C0lin,

Can you post your 3dm file?

– Dale

Michael_Pryor · January 25, 2019, 9:24pm

If the shape doesn’t change what would be the reason to use tween vs array?

Dunno if you use Grasshopper, but Pufferfish has components for tweening along curves.

Tween along curve.gh (9.2 KB)

C0lin · January 25, 2019, 9:45pm

Sure thing! File attached. My rationale for a tween is to ensure the shape hits a specific position on the other side of the curve. You can see that ArrayCrv “freeform” is not giving me the result I need. Is there another way?

And yes I do use Gasshopper! I will check it out, thanks. Assumed this could be solved easily in Rhino…

ArrayCrvTween_vs_ArrayCrv.3dm (277.0 KB)

C0lin · January 25, 2019, 10:52pm

Pufferfish is great! I was able to fix it simply by rebuilding the path curve. Although, I don’t really know what was wrong with the original curve to begin with. Perhaps this was why I was getting weird results with ArrayCrvTween. Thanks for the help.

EDIT: The new path curve does not seem to solve it on the rhino side, still getting the same results with ArrayCrv and ArrayCrvTween.

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Tween along curve

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