Dragging Control Polygon for sketched spline?

[AXNRXN]

Hi All,

I posted this question months ago and I guess I either forgot the answer or moved on to other things and never figured it out.

I'm trying to figure out how to drag the control polygon for a simple two point spline that is constrained by tangency at both end. I do this all the time in older Pro/E releases and SolidWorks for creating surfaces, but for the life of me I can't figure it out.



Simple scenario:
1. Open a sketch and draw two line segments at 90-degrees to each other that you can connect with a spline curve.
2. Sketch in your spline connecting both line segments.
3. Add tangency constraints on both ends of the spline curve so that it makes a smooth curve between the line segments.
4. Now, I used to be able the right-click the spline, choose MODIFY, and then I could click one of the buttons to get the constrol polygon to show up. You can drag the two polygon points, but the ends of the spline stay tangent.

But for some reason I can only get that button to work or drag any control polygons if the spline curve has no tangency constraints on it. I swear to my lord and savior that I've surfaces products for years in Pro and this is how it worked.

For example, in Solidworks, I set up the same sketch and the spline curve automatically has two drag arrows that I can pull around in length to adjust the spline.It still stays tangent to the two line segments, but I can adjust the look of the spline.

Thanks for any help!

 

[jvian]

Definitely not possible in my version either but why not add a third point in the middle of the spline? Enter the spline modification mode and somewhere on the spline right click and select add point. This would give you all the control you need to modify the spline. The only other option is to create the orthogonal lines and define points along them (or use the end points) and then define a feature curve (not a sketch) through those points with the defined endpoint tangency. As long as this defined curve is a spline with only two points you can then "tweak" the curve which allows quite a bit of manipulation. There is some information about the tweak curve option in the help files.

Hope that helps,

-J-

 

[AXNRXN]

Thanks,

I called my Pro/E vendor about the issue and it I guess it is a known bug that started in WF5. WF4 has the functionality as does the latest release of WF5, but its missing in earlier WF5 releases and Creo.
Here's the email from support:

"It looks like PTC knows about the issue we went over this morning. It also appears there is no solution yet for Creo but it looks like if you get WF 5.0 build code m110 you should get that functionality back. See attached picture. I know this probably is not the answer you are looking for but at least you are not crazy right. I also checked to see what build code of WF 5.0 is out and it appears M120 is out so if you get WF 5.0 M120 you should be good to go. Let me know if you have any other questions."

The third spline point wouldn't work for me because it creates an inflection point. If you change the models boundary dimensions, this can cause the surface created from the spline to get all wonky.

I can't believe that PTC would have a bug this big spread over two releases.For what I do, this is like not being able to change the dimension of a circle. So, now I have get the latest WF5 build and use that, then import to Creo before I send it to the client. Garbage.

--> Karl