topic Re: Enneper Surface - how to model in Creo in 3D Part & Assembly Design

Enneper Surface - how to model in Creo

BHOoi — Fri, 30 Nov 2018 19:28:08 GMT

Hi, I have tried approximating the simplest form of the above surface but the results are not satisfactory. I am sure this can be modeled with a better surfac equality, just that I do not know how.

i attached here the original IGES file retrieved from internet and the step file of my own version. May be some of you could help to look at it and share with me the better way to model this surface. Many thanks in advance.

Re: Enneper Surface - how to model in Creo

John.Pryal — Wed, 20 Dec 2017 10:56:40 GMT

I seem to remember modelling a surface like this some time in the distant past. I think I used a toroidal bend. I just knocked together a very basic model & it seems to create a reasonable surface. Model attached.

Regards

John

Re: Enneper Surface - how to model in Creo

BHOoi — Wed, 20 Dec 2017 13:03:02 GMT

Thanks, John. Unfortunately I am still on Creo2. Possible to send Creo2 version?

Re: Enneper Surface - how to model in Creo

John.Pryal — Wed, 20 Dec 2017 14:27:59 GMT

Creo 2 model attached.

Regards

John

Re: Enneper Surface - how to model in Creo

BHOoi — Thu, 21 Dec 2017 01:33:15 GMT

THANKS. This is definitely another of modeling that shape and it's really a simple way.

I have also managed to improve the surface quality further as shown below:

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Sun, 07 Jan 2018 01:02:17 GMT

I played with it, and this is the one I'm most happy with. I think, at it's core, creo isn't really happy trying to make C2 surfaces. There's ripples where there shouldn't be. I wish they'd offer an upscale version (not something else) that had true C2 capability, where you could establish the boundaries, and force the resultant surface to be C2.

Re: Enneper Surface - how to model in Creo

BHOoi — Mon, 08 Jan 2018 00:48:57 GMT

This is fantastic!

Would you mind to share how did you model or share your creo 2 file ? Thanks in advance.

Re: Enneper Surface - how to model in Creo

dschenken — Mon, 08 Jan 2018 04:15:54 GMT

I'd rather see true analytical surfaces; the original surface is one that is parameterized. The one in the IGES file is a BSURF. I don't know if it's identical to the original surface. Unless I've missed surface-by-equation?

Re: Enneper Surface - how to model in Creo

BHOoi — Mon, 08 Jan 2018 05:37:46 GMT

The only file I got is that IGES file I attached in my first post. I don't have anything else for reference.

Re: Enneper Surface - how to model in Creo

dschenken — Mon, 08 Jan 2018 06:41:23 GMT

I meant that PTC should add analytical surfaces / surface by equation to the software. I think I understand the reason they haven't, but it would still be nice to have.

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Mon, 08 Jan 2018 21:31:13 GMT

Here's a .stp file disguised as a .bmp file, just change the filetype back to .stp

I plan on tweaking it a touch to try and get it a little smoother.

Re: Enneper Surface - how to model in Creo

BHOoi — Tue, 09 Jan 2018 01:03:23 GMT

Thanks, this quilt is very smooth! Only thing I am unable to do is to offset it, might be due to its degenerate corner. I am sure this can be improved.

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Tue, 09 Jan 2018 16:26:41 GMT

Yeah, this is exactly what I was talking about. I'm not liking how creo is handling this area. Granted it's a small area, but still. I was not able to even create the surface the way I SHOULD have been able to, I was forced to pick these edges a certain way to even get it as smooth as it is. I have a couple more trick up my sleeve I'm going to try for fun. Not knowing the actual math behind an enneper surface, I can only make what I THINK it is, but, regardless, I think it's a cool surface from an "artsy" perspective.

Re: Enneper Surface - how to model in Creo

BHOoi — Wed, 10 Jan 2018 02:39:50 GMT

Great, do share if possible once you manage to get the best approximation.

For the sake of modeling challenge, I also noticed that its wing is symmetrical not only to left and right but top and bottom sides too. Not sure how to describe it better but the pic below explains what I am trying to say here:

Is this something do-able?

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Thu, 11 Jan 2018 22:20:10 GMT

Mine is symmetrical like that. The "waves" are sharper, but that was because of how I did it, to be a little more dramatic. I can round them. I wasn't sure exactly what an enneper surface is. I agree, we should be able to just do an equation and get a true surf.

Still no luck getting it better....

Re: Enneper Surface - how to model in Creo

BHOoi — Fri, 12 Jan 2018 00:48:39 GMT

Thanks for the effort and your version is a good reference for me though.

Re: Enneper Surface - how to model in Creo

BHOoi — Mon, 15 Jan 2018 06:48:35 GMT

After many attempts, I have come to this approach which I think the best I have got so far. I include the creo2 file here for reference/comment. Hope it helps us to understand this mathematical surface better.

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Wed, 17 Jan 2018 01:05:21 GMT

Well, I haven't given up on my first model, as it's more "adjustable" as to shape (how sharp the points are, how much the shape curles, etc.), but, as we've seen, sometimes fancier DOES cause issues. I AM disappointed I couldn't get a better result out of the Boundary Blend in that model.

And, I have to thank you for leading me in a different, simpler, direction, which ends up being smoother still. I used simple datum curve splines though 3 points instead of a sketch at both the ends of your boundary blend in both directions, and let the software do the work. Same basic layout as yours, but with 5 fewer features and, it looks like, a slightly smoother blend. This one, I'm happier with, although I would have liked the control the first try gave me. Maybe version 7 will be absolutely the one..... 😉 I wasn't able to attach the creo3 file, but here's the .stp as a .bmp file, just delete the .bmp off the end. Enjoy!

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Wed, 17 Jan 2018 00:53:17 GMT

Re: Enneper Surface - how to model in Creo

Patriot_1776 — Wed, 17 Jan 2018 01:03:01 GMT

One thing to remember: We are NOT getting a "mathematical surface", we are getting our APPROXIMATION of the true equation-driven surface. I suck at math, so I really have absolutely no idea what the surface really is, I just thought it was a fun challenge and wanted to make it as smooth as I could.