topic Nurbssurface question in Libraries & objects

Nurbssurface question

Nader Belal — Fri, 13 Apr 2018 00:21:41 GMT

Hi to all,

I have written this small code


Nurbssurface 	2, 	1,	3,	2,
				0, 	0,	0.5,0.5,1, 1, 
				0, 	1,	0,	1,	0, 1, 
				0, 			0.279506, 0, 		1,
				0, 			0.279506, 0.5207,	1,
				0.124078,	0.279488, 0, 		0.990676,
				0.124078,	0.279488, 0.5207,	0.990676,
				0.243544,	0.245977, 0,		1,
				0.243544,	0.245977, 0.5207,	1

But I´m getting this error message

Too many paraameters at line 1 in the 3D script of the file

I want to know what I have been doing wrong.

PS: The file doesn't have anything but that

Re: Nurbssurface question

Daniel Kovacs — Thu, 19 Apr 2018 16:51:02 GMT

Hi,

I think the problem is that you have too many knot_v values. According to the GDL user manual the number of knot values in each direction should be "mu = degree_u + 1 + nu":
http://gdl.graphisoft.com/reference-guide/nurbs-geometry-commands

In you case that should mean 6 for U direction and 4 for V direction, but for the latter you have 6 as well.

But to be honest, I don't think this code was intended for human use. I think this was actually created, so that when you import nurbs geometry from a Rhino file as an object, it could generate this code. Of course it is good to know how it works in case you needed to tweak it a bit or something, but I am not sure you'll be able to create a nurbs surface by hand with this command.

Good Luck anyways!

Re: Nurbssurface question

Nader Belal — Thu, 03 May 2018 14:23:54 GMT

Thank you Daniel

Re: Nurbssurface question

leceta — Thu, 03 May 2018 23:07:16 GMT

GDL object called from grasshopper would also be a interesting way to use these nurbs function. Just thinking loud...