LoftSDK (Adjust Seams)

Hello All!

I wonder if someone could help me with this question:

There is an option in _Loft to //Adjust Curve Seams// and if you loft with GH Loft component - it has the same option to Adjust Curve Seams.

However I've been having difficulties to achieve that with LoftSDK (in VB). Say I want to loft curves within the VB script, but //MArgsRhinoLoft// doesn't have the option to Adjust Curve Seams - so the loft comes out all twisted.

Please, let me know if there is such functionality built in the SDK or I'd have to workaround.

Thanks!

Dima

Replies to This Discussion

Permalink Reply by David Rutten on March 9, 2010 at 2:50pm

This is the code I use in the Loft component to Adjust the seams:

If (bOptions.AdjustSeams) Then
Dim iBasePt As On3dPoint = nSections(0).m_curve.PointAtStart
Dim iBaseDir As On3dVector = nSections(0).m_curve.TangentAt(nSections(0).m_curve.Domain.Min)

For i As Int32 = 1 To nSections.Count - 1
Dim Curve As OnCurve = nSections(i).m_curve
If (Curve.IsClosed()) Then
Dim t As Double
Curve.GetClosestPoint(iBasePt, t)

'Flip the curve if the direction is reversed
Dim pA As On3dPoint = iBaseDir
Dim pB As On3dPoint = Curve.TangentAt(t)
If (pA.DistanceTo(pB) > Math.Sqrt(2)) Then Curve.Reverse()

'Only change if sufficiently far away
Dim adjDistance As Double = Curve.PointAtStart.DistanceTo(Curve.PointAt(t))
Dim crvLength As Double : Curve.GetLength(crvLength)

If (adjDistance > (0.01 * crvLength)) Then
Curve.ChangeClosedCurveSeam(t)
End If

iBasePt = Curve.PointAtStart
iBaseDir = Curve.TangentAt(Curve.Domain.Min())
Else
iBasePt = Curve.PointAtStart
iBaseDir = Curve.TangentAt(Curve.Domain.Min())
End If
Next
End If

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by dima on March 9, 2010 at 3:59pm

Many thanks!

Permalink Reply by Igo Kommers Wender on April 7, 2010 at 1:34pm

Hey, could you tell me please how do you insert the code in the Loft component to Adjust the seams. I have the same problem, but as I´m a new user on this all new world it sounds a bit tricky for me.
Thanks in advance,
Igo

Permalink Reply by David Rutten on April 7, 2010 at 2:02pm

Igo,

I wrote the Loft component from scratch, so no code "insertion" was required. Dima is trying to Loft in a custom Script component, and he was having problems with the Rhino SDK Loft function.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Igo Kommers Wender on April 7, 2010 at 2:19pm

Thanks for your reply David. It's a bit clearer than before.
Cheers,
Igo

Permalink Reply by Diego on January 24, 2011 at 6:47pm

And for adjustin the beams in the default grasshopper loft? I've been toching the loft options but i cannot solve it... (the problem is between hexagons and circles).

Any clever ideas?

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