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mamobono10-Marble
10-Marble
October 2, 2023
Question

spline - to impose tangency conditions in the splines at the intermediate points

  • October 2, 2023
  • 2 replies
  • 3256 views

Hi, I still use the WF4 version and I would like to know if on the latest versions of Creo Parametric it is possible to impose tangency conditions on lines/planes/curves in the splines at the intermediate points as happens for Catia.
The curves referred to are external to the spline profile.
To better understand what I mean, look at this
https://www.youtube.com/watch?v=Ba8ycG1dPtA
at minute 30.45
forget the rest

You can also get there by building but it's quicker that way

HI

2 replies

kdirth
21-Topaz I
kdirth21-Topaz I
21-Topaz I
October 2, 2023

As of 7.0, you cannot impose constraints at interpolation points on a 3D spline.  You would have to create multiple splines with constraints on the end points and then create a composite curve.

There is always more to learn.
T
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
October 2, 2023

The Creo features that would be an analog to the CATIA functionality you are looking at are ISDX curves and surfaces. ISDX curves have more control available to them than "regular" splines. You must of course have access to the ISDX Creo extension to use ISDX features.

    M
    mamobono10-MarbleAuthor
    10-Marble
    October 3, 2023

    I tried using Style but I can't impose constraints on the intermediate points.

    See Attachment

    Maybe it's my old WF4 version that doesn't allow it.

    HI

    T
    22-Sapphire II
    tbraxton22-Sapphire II
    22-Sapphire II
    October 3, 2023

    In your screen shot the style curve you have created is curvature continuous (higher continuity C2 than tangent C1 ) so it is "better" than tangent at the points where you note that you are not able to "constrain the point". If you need explicit tangent control at those points you can split that style curve such that you have end points available at the locations, you have noted. You will then have access to the tangent vector at the proximal and distal ends of each curve.

     

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