 | | | Get U-position of nurbs curve point? | Get U-position of nurbs curve point? 2004-06-18 - By Schoenberger
Back
I unerstood his way, But I would use te position of the knot instead of
the position of the control point to
get the new position. But I forgot that the Knot doesnot have a position
array....
damn
>> -- --Original Message-- --
>> From: owner-xsi@(protected)
>> [mailto:owner-xsi@(protected)] On Behalf Of Bradley Gabe
>> Sent: Friday, June 18, 2004 7:40 PM
>> To: XSI@(protected)
>> Subject: Re: Get U-position of nurbs curve point?
>>
>>
>> What Aloys said...
>>
>> 1- Get a pointer to the ControlPoint collection.
>> 2- Get a pointer to the ControlPoint object at its index
>> in the collection.
>> 3- You can access X,Y,Z values of the point as they are
>> properties of a
>> ControlPoint object.
>> 4- Put the XYZ values into a vector3() object.
>> 5- Even though the control point is not directly on the
>> nurbs curve, you
>> can use the GetClosestCurvePosition() method with the
>> vector3() object
>> as input. It will return a collection of data about the
>> coordinates you
>> input.
>>
>> If you're doing this in jscript, you'll want to search the
>> SDK docs for
>> any jscript examples on these methods. As far as I know,
>> it's the only
>> place to get examples of what data is returned at what
>> index position of
>> the return collection.
>>
>> Good luck.
>>
>> -Brad
>>
>> > 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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>>
>> --
>> Bradley R. Gabe
>> Industrial Light & Magic
>>
>>
>>
>>
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