
Re: About the intersection curve
Deepak Gupta Oct 14, 2011 11:35 AM (in response to Philippe Carette)Edit the sketch and check the relations either using "Show Relations" or select the entity to display the relations. Then click on the relation and it will show the features involved.

Re: About the intersection curve
Charles Culp Oct 14, 2011 5:04 PM (in response to Philippe Carette)Philippe,
I just want to add that I find intersection curve to be a very unstable tool. I only use it as a last resort, or as a visual guide for better controlled sketches. I will also try and use surfacing tools, like trim, instead of insersection sketches.

Re: About the intersection curve
Jerry Steiger Oct 14, 2011 5:15 PM (in response to Charles Culp)Philippe,
To add to what Charles said about the instability of Intersection Curves, it is important to remember that the intersection of a face with a plane will find all of the intersections. If my face has a large opening in it, the intersection will put a curve on the far away part of the face as well as the area I am interested in. This will drive me to distraction when I can't get a feature to work until I discover that far away, and possibly very small, segment and delete it or turn it into construction geometry. Later, when I roll back up in the tree and modify something which causes some tiny change in that face, the feature will fail again because SW has regenerated that far away segement.
Jerry Steiger

Re: About the intersection curve
Philippe Carette Oct 16, 2011 9:50 AM (in response to Jerry Steiger)Tx a lot for all your replies and tips.
>Deepak Gupta : ok, but if surfaces are hidden, then only one appear in watermark, but no name with it ...
was it too complicate, to list the 2 surfaces in the box where it is said : "at intersection of 2 facesN" ?
> Jerry Steiger and Charles Culp : I am not surprised if the SW intersection tool is unstable : I am wondering if just one subroutine from SW were bugfree.
In 2011, Mapple is at release 15, but I think that version 1 was able to calculate the intersection of 2 surfaces, in R^n (not only in R³, to be clear), and was already bugfree, for such feature.
Otherwise, there exists Mathematica, Matlab, and if the SW's staff don't want to spend too many bucks, Freemath and Scilab are freeware.
And all of them work perfectly, to calculate the intersection of 2 curves.

Re: About the intersection curve
Kevin De Smet Oct 16, 2011 2:08 PM (in response to Philippe Carette)Well, there's a difference between calculating an intersection curve and implementing it into a solid modeling system. The latter being quite a bit trickier!

Re: About the intersection curve
Charles Culp Oct 17, 2011 9:23 AM (in response to Philippe Carette)Philippe,
The tool works great, once. The problem is when you make changes to the model above the intersection curve in the feature tree. Then it will recalculate where those intersections are again, and your sketch relations related to that may get out of order. This can cause all sorts of errors in your total sketch.


