Get U-position of nurbs curve point? 2004-06-18 - By Schoenberger
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Then I would use the Knot point array to find the U position...
>> -- --Original Message-- --
>> From: owner-xsi@(protected)
>> [mailto:owner-xsi@(protected)] On Behalf Of Aloys Baillet
>> Sent: Friday, June 18, 2004 3:09 PM
>> To: XSI@(protected)
>> Subject: Re: Get U-position of nurbs curve point?
>>
>>
>> Hello,
>> I think you can't!
>> The main reason is that control points are not on the
>> curve, only knots are.
>> I would advice you to use the GetClosestCurvePosition
>> method of the
>> NurbsCurveList object with the position of th control
>> point : it will
>> return you the u value.
>> Good luck!
>>
>> --
>> Aloys Baillet - R&D @ La Maison
>> --
>>
>>
>>
>> Schoenberger wrote:
>>
>> >Hi
>> >
>> >I'm trying to get the position of a nurbs point on a curve.
>> >Someting like a length from start of the curve to the point.
>> >I have a little script, that does it, but I need
>> something that works
>> >with the object model.
>> >What I have:
>> > GetCurvePercentageAtKnotIndex "crvlist", MyPointIndex, perc
>> > clength = GetCurveLength("crvlist")
>> > PostionOnCurve = clength*perc/100
>> >
>> >Now I want that result, but with the object model.
>> >What I have found till now is:
>> >.Geometry.length
>> >.Geometry.curves(0).GetPercentageFromU
>> >.Geometry.curves(0).ControlPoints
>> >
>> >
>> >Perhaps I am stupid or missed something in the docs, but
>> how to get the
>> >U position of a Control point?
>> >With the U position I could get the percentage and
>> everything would be
>> >fine.
>> >
>> >
>> >Holger Sch�nberger
>> >technical director
>> >The day has 24 hours, if that does not suffice, I will
>> take the night
>> >
>> >
>> >
>> >---
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>> >
>> >
>> >
>> >
>>
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