Curve continuing to influence surface thru transitional curves in curve network



Please forgive me if my question is a bit cumbersome…I am not sure how to explain it in correct technical terms…

I am creating a men’s signet ring:

  • using curve network

  • using a shield shape as the top profile shape, which has a rounded point at top, and then the top “corners” have been “lopped off” to be chamfered with rounded corners as well.

  • I have three more additional closed curves positioned moving down the ring, which I thought I would use to transition the surface from the corners to a smoother surface as it moves downward.

  • I also have four side profile curves to help control the shape of the shank (front and side)

my question is: how to I eliminate the influence of the corners from the top profile curve as I move down the surface?

I thought the additional curves would sort of create a transition to the smooth, and although they are vastly improving the smoothness, influence from the top profile is continuing down the ring surface.

I did go ahead and come off the corners a bit more tangentally and less concave, and this did help to reduce the influence…

I hope I am making some sort of sense…

Any advice would be greatly appreciated.

Best Regards,

(David Cockey) #2

Try creating the side as two surfaces. First the lower surface as the desired. Then create the upper surface using the edge of the lower surface (not the curve used for the lower surface) as one of the edge curves for the upper surface. If you use NetworkSrf when creating the upper surface you can choose the degree of continuity you want between the lower and upper surfaces.

(Pascal Golay) #3

Hi Julie- It’s always best to provide the curves and surfaces you are asking about if you can, it makes it much easier to help…




so sorry,here is a photo in plastic shade mode.
I also tried to split and add a transitional surface at the uppermost yellow curve, and then use that new trans surf edge to redo the bottom half with curve network, and this did reduce the influence a lot, but I ended up with discontinuity at the two joins that I could not eliminate either.

I was trying not to have to split the surface…yet…

I also got some advice to work on half the model and that helped to eliminate the influence…I would also like to understand why this helped with the influence as well…

any advice would be greatly appreciated.

Best Regards,

(Marc Gibeault) #5

Hi Julie,
It’s hard to know what are the problems and what you’re after only with a screen capture. To be helpful, Pascal asked that you provide the geometry, you can attach a .3dm file to your post.
Anyway, when you’re talking about “influence”, is it that the surface you’re creating with NetworkSrf has continuity with its neigboors that you don’t want? In the NetworkSrf dialog box you can select contact/tangency/curvature for each edge with radio buttons.



@pascal @Marc she may mean those marked areas

my suggestion is as in the picture


(David Cockey) #7

Another method to avoid the lower portion being influenced by the upper portion is to create the lower portion first (Surface 1) first. Next create the upper portion (Surface 2) using NetworkSrf with the edge of Surface 1 as one of the curves in the network, and selecting the desired level of continuity between the two surfaces.


Hello All,

(sorry for the delay in this reply! I thought I sent one already, but just realized I did not!)

Thank you all for your helpful advice, I really appreciate it!

I have been playing around with both of the suggestions and they are helping alot, so thank you!

Best Regards,