Blend Surface Bug

Replies to This Discussion

Permalink Reply by Luca De Vivo on August 10, 2017 at 1:28pm

Also I tryed moving the surface farther away and this is what I get.

It seems that it is failing to recognize where the actual surface is.

See images bellow

Thanks again

Attachments:

• Error.JPG, 60 KB

Permalink Reply by Birk Binnard on August 10, 2017 at 2:27pm

Your icon image shows what appears to be an airplane using the joined wing design concept. This type of design was invented and patented by a former neighbor of mine, Julian Wolkovitch. Boeing looked at this concept but for some reason never continued beyond making some preliminary drawings.

Solving your problem would be much easier if you posted your GH file here.

Permalink Reply by Birk Binnard on August 10, 2017 at 2:54pm

Here's a very simple/incorrect approach that might help you.

Attachments:

• BlendedWing1.gh, 11 KB

Permalink Reply by Luca De Vivo on August 11, 2017 at 1:16pm

Hi Birk

Thanks for you reply. I took a look at your script but the problem is that I need to create straight wiglets, you will have a better idea of what I am talking about once you take a look at my script. 

I am attaching my GH file. It is a bit messy but take a look at the final part of it when I am trying to blend the wing with the wiglets. 

Attachments:

• Box_01_forCFD.3dm, 1.2 MB
• LinesForWingProfile_BoxWing.gh, 95 KB

Permalink Reply by Birk Binnard on August 11, 2017 at 2:00pm

Well I may be totally off in left field here, but I just plugged in a ruled surface and the results look pretty good to me.

You do have nice looking airfoils - congrats for that.

Permalink Reply by Luca De Vivo on August 11, 2017 at 2:09pm

Hi Birk 

That looks great!! did you have luck joining all the surfaces now? 

COuld you please share your GH file with me to learn how you did it

thanks again for ur support

Permalink Reply by Luca De Vivo on August 11, 2017 at 2:13pm

For some reason when I try to loft the two curves it gives me a Null result

Permalink Reply by Luca De Vivo on August 11, 2017 at 2:14pm

JK didnt read about the ruled surface...

It works great!!!

Thanks Birk

Permalink Reply by Birk Binnard on August 11, 2017 at 2:32pm

Happy to help - I haven't seen airfoil shapes in a long time, so it was nice to find some again. I have no idea why the GH Loft function failed but the Ruled Surface worked. When I was working with wing shapes (DC-10 & F-4) wings were simple ruled surfaces, so that was my first guess on how to solve your problem.

Permalink Reply by Luca De Vivo on August 11, 2017 at 3:11pm

Birk that worked nicely!!

but now I am facing another challenge. 

I currently have 3 surfaces (main wing, winglet and transition) sections and when I try to join them to create one polysurface GH fails to do so. 

I have tried using the Join Brep command, the Solid Union comand and the FaceMerge command but none of them seem to be working.

Thanks again

Permalink Reply by Birk Binnard on August 11, 2017 at 4:51pm

I don't mean to sound sarcastic, but...welcome to the real world. Since I am just a 3D printing hobbyist I have done very few designs with multiple parts. However I have encountered exactly the same problem you describe. A couple of times I was able to merge multiple parts by using the Rhino menu Solid/Create Solid command. But in most cases I was simply unable to find a way to output a single solid object.

In my case, since my Rhino output is an STL file, I was almost always able to fix the resulting STL file with other software. I expect that's not going to work for you. A couple of times I had to redesign things in GH to end up with printable results. I understand this approach is not workable for you either.

You could try exporting from Rhino in some standard 3D format that could then be taken into some other 3D design package and fixed up there. The top 2 that I know of are Solidworks and Catia, both of which are really expensive.

Alternatively you could internalize your Rhino data into your GH file, post it here, and ask for help. There are a number of true GH wizards here who seem to be able to solve most any problem. I am a long way from being that skillful.

Permalink Reply by Luca De Vivo on August 11, 2017 at 1:23pm

Hi Tom

I am posting a file with the rhino version of the baked surfaces and the GH I am using to create the wing. It is a bit messy but I am sure you will understand. The main problem I am facing is to blend two different airfoils (2 different curves) one for the wing the other for the winglet. since the wing airfoil needs to have canver, for lift purposes and the winglet needs to be symmetric for stability. 

Attachments:

• Box_02.3dm, 1.2 MB
• LinesForWingProfile_BoxWing.gh, 100 KB