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% parameter of a point on a spline?

Genius
Genius

Is it possible to measure the % parameter position of a point on a spline? I need this value to match two points on two splines. The two points would be used to create an internal control curves for surfacing.

 

Currently I create a Thru Curves first and then extract an isoparametric curve to get two ends of the same % parameter.

 

Thanks!

14 REPLIES

Re: % parameter of a point on a spline?

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

IIf you create a "point on curve", you can specify the % parameter

pointoncurve.png

Ken Akerboom Sr CAx Systems Engr, Moog, Inc.
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled


Re: % parameter of a point on a spline?

Genius
Genius

Hi @Ken_A  Thanks for your reply! Yes, a point can be created at specified location. But in my situation, I want to know the % parameter of an existing point (e.g. an intersection point, a knot ...) on a spline. With this value I can create a corresponding point on another spline.

Re: % parameter of a point on a spline?

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

This is doable with an API program or Journal

Not sure if "Info" or "Analysis" or expressions -> distance has something you can use to get this number

Ken Akerboom Sr CAx Systems Engr, Moog, Inc.
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled


Re: % parameter of a point on a spline?

Genius
Genius

Hi @Ken_A  Thank you!

Re: % parameter of a point on a spline?

Siemens Phenom Siemens Phenom
Siemens Phenom

@surfactant

This is not exactly a simple answer, but it works. See the attached part.

Basically the steps I used are the following:

  • create a length measurement of the first curve (length1)
  • Outside the sketcher (assuming your curve is in a sketch) create a trim curve feature using the same object you used to define the intersection point
  • create a length measurement of the trimmed curve (length2)
  • Create a percentage expression: 100*(length2/length1)
  • Define a point on your second spline using the percentage expression to define its location.

Hope this helps.

 

Regards,
Abe

Re: % parameter of a point on a spline?

Genius
Genius

Hi @Abeinjapan   Thanks for your example! What you get seems to be % Arc Length?

Re: % parameter of a point on a spline?

Siemens Phenom Siemens Phenom
Siemens Phenom

@surfactant

Yes %arc length.

Regards,
Abe

Re: % parameter of a point on a spline?

Genius
Genius

Hi @Abeinjapan   What about % parameter? Thanks!

Re: % parameter of a point on a spline?

Siemens Phenom Siemens Phenom
Siemens Phenom

@surfactant If you're not talking about the arc length I am not sure I know what you mean by the %parameter.

Regards,
Abe