Anis,
The seam is part of the geometry, but you can select and hide it.

Hi Anis, I think I'll need a little more clarification.

Certain objects such as a cylinder have as part of their definition an edge that is called a "seam edge" - is that the kind of edge that you are referring to? If so then like Burr mentions that is a natural part of any NURBS surface.

But possibly you are referring to something more like "seamless class A surfaces" ?

If so, then yes MoI can produce such surfaces with the Fillet (use Shape: Blend options), or the Blend command. But that's it currently. In the future I do want to add some continuity options in to some other commands as well such as Network and Sweep, but it will take a while before that will happen.

- Michael

Hi Michael, Burr....

> Certain objects such as a cylinder have as part of their definition an edge that is called a "seam edge"

Yes, thats what I mean. As I know solidworks also produce nurbs object, but there is no "seam edge". Sometimes seam edge make me in trouble when do filleting and select edge.

I know we can hide it, but I like to be automatic disappear. What is the benefit of seam edge ?

Hi Anis - all closed NURBS surfaces have a seam edge in them.

SolidWorks may have some kind of method where it automatically hides them or something, but any closed single NURBS surfaces that SolidWorks creates will also have a seam edge as well, it is something that is fundamentally in the definition of a NURBS surface.

I think that SolidWorks may tend to create closed surfaces as 2 joined halves, which does avoid seams though but creates 2 surfaces instead of 1 single surface.


> What is the benefit of seam edge ?

It allows for a single NURBS surface to be a closed shape, like for example a cylinder or a sphere.

Every NURBS surface has an internal UV layout as if it were a rectangular sheet.

It is possible to "pinch together" some edges of this sheet to make a pole region, for example at the top and bottom pole of a sphere - those are areas in the surface where an edge of the rectangular sheet has been collapsed into a single point, the control points of that edge of the surface are stacked up on top of each other in the same 3D location.

Then for making a closed surface, that will involve a seam edge - this is like if you took a rectangular sheet of paper and rolled it into a tube - the tube will have one end of the sheet of paper touching the other end - that is what makes a seam edge.


You can avoid seam edges if you also avoid closed single surfaces.


You cannot avoid seam edges on closed NURBS surfaces, because that like asking for something like "give me some salt, but make sure it has no salt in it". A seam edge is part of the fundamental definition of a single closed NURBS surface.

- Michael

Hi Michael....

Your explanation very details & clear for me.... :)

> SolidWorks may have some kind of method where it automatically hides them or something

What do you think about implementing this methodology in moi ?

Thanks Sir.....

Hi Anis,

> What do you think about implementing this methodology in moi ?

It's certainly a possibility in the future!

There are some problems with handling seam curves in certain situations though, particularly with fillets. I would probably want to wait until some of these areas are handled better, otherwise if the seam was hidden it would be difficult to even have a chance at recognizing that the seam in that area was related to the problem.

- Michael

Hi Michael.....

> I would probably want to wait until some of these areas are handled better

Yes, it will better....
Your thinking analysis make moi better and different than others..... :)

Thanks

Hi Michael...

> In the future I do want to add some continuity options in to some other commands
> as well such as Network and Sweep, but it will take a while before that will happen.

Well, I wish in V3 and dont forget 2D Drawing ( at least basic )....

Thank You