Surface Network curve error: more than 2 curves required

Replies to This Discussion

Permalink Reply by David Rutten on April 30, 2017 at 12:33pm

Hi Stefano,

you didn't attach the 3dm file so the original curves won't load and the whole file fails to work.

It's typically a good idea to post just the minimal file anyway, ideally with all data internalised. 

Permalink Reply by Stefano Ascari on April 30, 2017 at 1:07pm

David, certainly! Here is the 3dm. I'm essentially starting from 2 curves to create a berm with graphpads to control ridge and cross profile. Any advice wellcome!

Attachments:

• base upload.3dm, 159 KB

Permalink Reply by David Rutten on April 30, 2017 at 1:41pm

The error claims that "At least two curves are needed in the V direction"

When you inspect your V data, it turns out you have one list of two curves (that's all fine!) and second list containing only a single curve (this is why you're getting the error):

If those three curves are supposed to end up in the same surface, you need to make sure they are all part of the same list. Flatten might do the trick, but will also throw a spanner in the works if you want to make your file more complex. You should probably figure out why the third curve ends up in a different list and apply the correct tree transformation to remedy that.

Permalink Reply by Stefano Ascari on April 30, 2017 at 2:40pm

David,

Thanks for your reply. I flattened the curves into a list but it's still giving a null return. I'll have to do some more investigating. 

Attachments:

• Capture.JPG, 43 KB

Permalink Reply by David Rutten on April 30, 2017 at 4:11pm

Are those curves in the right order after flattening? The Rhino command does a lot of cleaning up that the component does not do. 

Permalink Reply by Stefano Ascari on April 30, 2017 at 5:17pm

David, apologies if this is obvious. Should I be using something like the "Sort" component? Thanks

Permalink Reply by Stefano Ascari on April 30, 2017 at 6:02pm

David, 

You were completely correct. The order of the curves in the list affects whether the surface network will compute or fail. Thank you for your assistance!