Get U-position of nurbs curve point? 2004-06-19 - By Bradley Gabe
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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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