a "knot" problem

Replies to This Discussion

Permalink Reply by David Rutten on January 6, 2013 at 4:14am

Knot = Control-Points + Degree - 1

Plus, not minus.

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David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Carcassi on January 6, 2013 at 10:50pm

why i insert points on knot position in a 5 control points 3 degree curve while knots snap is openning ,i just find one position not seven,except the start and the end position.you can try.

thank you .

By the way ,you could not anwser how to match the names of variable to the input name in python battary.

thank you .

Permalink Reply by David Rutten on January 7, 2013 at 3:47am

Clamped nurbs curve have duplicate knots at the start and end of the curve. So in the case of a degree=3 point=5 nurbs curve, there have to be 3+5-1 = 7 knots. Because the degree is 3, there will be 3 identical knots on end ends of the curve, so the knot vector will look something like:

0,0,0,1,2,2,2

So one at each end and one in the middle.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Carcassi on January 7, 2013 at 7:31pm

thank you .another question?

if i wanna write program in rhinopython.i dont know the diffirence between using the rhinosrcipt and rhinocommon.

Permalink Reply by David Rutten on January 8, 2013 at 1:07am

I don't support python because I don't know it well enough. However if you're going for RhinoPython than you don't have to worry about RhinoScript. RhinoScript is a plugin for Rhino that exposes a thousand or so methods via the Windows Shell Scripting Host, most typically accessed using vbScript, though it's also possible to use jScript.

RhinoPython uses RhinoCommon but it does come with a library of methods that mimic the RhinoScript SDK. These methods are open source so you can see their implementation, but that's pretty much all I know.

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David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Carcassi on January 8, 2013 at 1:52am

thank you for your kindness,david

i plan to learn rhinopython and rhinocommon,i wanna write battery by myself.

Permalink Reply by Behnood Eghbali on January 15, 2013 at 7:07am

Thank you David! I had the same problem with knots.