NURBS Curve issue

I am having a problem with NURBS curves, and other curves as well. My problem is that for some reason I can never get the function to accept my first point, which is this case is 0,0,0. See the attached definition to see what I'm talking about. This is a subset of a larger definition.

I have tried setting this as an actual point as Rhino geometry as well as setting it up differently within Grasshopper, but it never seems to take. Any ideas?

Attachments:

NurbsCurvProb.gh, 12 KB

Replies to This Discussion

Permalink Reply by Kev Delaney on November 13, 2015 at 2:19pm

I guess if I make the point a list item it works.

Permalink Reply by Joseph Oster on November 13, 2015 at 3:49pm

Look at this - see the problem?

If you 'Flatten' the list at the 'Nurbs V' input, it will work. And/or you can simplify by doing this:

Permalink Reply by Kev Delaney on November 13, 2015 at 7:06pm

Thanks. I sorted it out earlier and everything is working well now. It's funny you bring up the simplification. I was trying to do that as well, as I had been doing it at work a while back, but I forgot how! That's sorted too now, so thanks!

Permalink Reply by Joseph Oster on November 14, 2015 at 6:26am

Yeah, I guess the important thing to learn from this is why it failed and why flattening the list _OR_ using 'List Item' to get point 0,0,0 fixes the problem. The way it was posted here, the list being fed to 'Nurbs' was partitioned - 0,0,0 in one list and the other points in a second list. 'Nurbs' (and many other components too) only works on points in a non-partitioned list.

By the way, here is another simplification; instead of this:

you could do this: