Is there any way to connect 2 NURBs objects together? I’ve 2 separate objects which I need to join at a certain point but can’t find a way to do it. Blender always says the resolution does not match :-?
Hi
Just count the “missing” rows and add them.
If it’s in the extremity you can extrude
In the middle of the object, select two rows, and W key to subdivide.
Bye
António
How do I add missing rows?
I’ve tried selecting individual vertices connecting them manually but nothing happens when I press f. Control-f to create a skin between them (which is what I want to do) doesn’t work because the resolution doesn’t match :-?
Well, another try!! 
Count the control points in the extremes of the surfaces you want to “weld”
If you need to add just 1 , 2 or 3 it’s quite simple
To add a row of control points in the extremity of the surface , select one of the extremes row ( to select a complete row, select one of the points and do Shift-R one or twice) and EXTRUDE it with E key.
To add a row in the middle of the surface, select two rows of points and subdivide them with W key.
Repeat the operation until the count is “good”
Is this clear??
Bye
António
Really no!
Sorry : you know how much I appreciate your work but this time I just cant see where you’re going with all that…
AFAIK, two surfaces can be joined only if they are open somewhere first.
For exampel, a ‘surface’ surface is open both in U and V so both can be joined, at the condition that the edges we try to join have the same number of control vertices, in other terms the same resolution. To add one c.v. to an edge AFAIK only subdividing to add a whole row works ; you’re extruding of only one c.v. doesn’t do anything here and goes against any definition of nurbs surfaces that I know…
So yes, you’ll really have to spell it out for the both of us.
Jean
I’m trying to create what is roughly a ‘T’ shape by joining two NURBs objects. I’ve tried to create one from scratch but the NURBs won’t seem to join that way. i.e. I can’t go from 1 row of curved surfaces then split it in to 2, going off in different directions. It always twists the surface to form a single row.
Hope I explained that clearly enough 
Is there any way of doing this with NURBs?
Alternatively is there another method I could use that will create this with a nice smooth surface? There are no sharp edges in the design so NURBs seemed the best way to do it.
Oh yes : quit busting your brain with surfaces for that model. They’re extremely useful but have their limits.
Use subsurfs : just do a mesh model and check SubSurf in the edit buttons F9. It’ll smooth everything out (a lot probably).
There’s much to learn about SubSurf.
These two tutorials tell you how to control the sharpness of an edge for example.
Round
and
sharper
There are no absolute rule with subsurfs : better try and experiment.
For example, many people will tell you to avoid tris (3 edges polygons), and they’re mostly right yet, if you look at my models, they’re full of them and still work : indeed they wouldn’t otherwise.
Subsurfs are quite powerful when understood believe me.
Pofo was doing great with them but I don’t see him around much these days.
I can only give you a couple of examples of my own which aren’t as good but still, if you turn subsurfs on and off you’ll see that from a very crude mesh one can nevertheless achieve quite a lot of modelling and quickly at that.
fighter airplane
and
Barney’s sworn ennemy
Callback for details if you need them.
Post a .blend : it helps to help.
Jean
Well, third try (now with a “drawing”).
. . . . ____ . . . . .
. . . . ____ . . . . .
. . . . .
. . . . ____ . . . . .
In the first object select the horizontal second and third row, them W key to subdivide. A new one will appear.
Now you’ll have 4 points at the extremity that will match the 4 points pf the second object ( and could be linked)
Now, it’s very hot, here in the countryside where i’m written this ( 40º C)
Maybe i’m missing something
At normal time, i’ll start to injuring you, but as IamInnocent sent me some “flowers”, well…
Sorry to bother you
Bye
António
Sorry, read " In the second object select…"
Formating text error
ok here’s the .blend file:
http://www.cyber.brad.ac.uk/~arwest/ship.blend
As you can see there are 4 separate sections. The 2 towers are fine by themselves but I want to connect the 2 parts of the hull together so it’s seamless.
Thanks for replying OTO but I’m not sure we’re talking about the same problem here 
I know a bit about subsurfs, but I thought this would be the fastest and simplest way to model it.
What ? No photo ?!
Well, now that the temperature is a bit lower (33º C) i’ve found
a little patience to handle youth ankwardnesses
Your surfaces are UNCONECTABLE
Maybe the better (and fastest) way, is to convert them to meshes and make
a boolean junction???
But Blender booleans are a bit young too
Oh welll…
good luck
Bye
António
Edit
Firstly there are some in-flexible rules for dealing with NURB surfaces. That
"Blender always says the resolution does not match "
error means that you have a disimilar # of knots that you are trying to join or that you are joining a U axis to a V axis. (C & W for you machinists)
Always save the file before you attempt joining.
You may want to reverse the normals on one surface before you join it to another (Thats [Ctrl] + [j] by the way) or one piece will seem inside out (Black) when you are working on it. To do that select it , go to edit mode and hit the [w] key. Choose “Switch Directions”
This is going to be amusing!
Firstly there are some in-flexible rules for dealing with NURB surfaces. That [quote]"Blender always says the resolution does not match "
error means that you have a disimilar # of knots that you are trying to join or that you are joining a U axis to a W axis.
[/quote]
I’ve heard of U ; I’ve even heard of V : but W ? W !
You may not have noticed but they are called surfaces : a surface is determined by only 2 dimensions.
The only thing you got right on your nice drawing is that edges with a different number of control vertices won’t join.
It doesn’t matter if you try to join a U edge to a V edge ; try something, like rotating 90° one of the surfaces before joining ; Blender will take care of the Us and Vs after…
…joining which is done BTW, with Fkey alone, no need for ctrl+Fkey.
Always save the file before you attempt joining.
You may want to reverse the normals on one surface before you join it to another (Thats [Ctrl] + [j] by the way) or one piece will seem inside out (Black) when you are working on it. To do that select it , go to edit mode and hit the [w] key. Choose “Switch Directions”
Or just do your thing and see after if you need to switch direction : maybe you won’t.
Now, what’s your pick :
a little (supposedly) bad advice that you probably didn’t really read or understood
or
a lot of very poor advice ?
=====================
Seriously Dorry Baby,
what we’re you thinking when you began a post by insulting people who only wanted to help ?
BTW, for the T shaped object that Andy is after, subsurfs are the way to go ; they also are a close mathematical relative to the nurbs surfaces but you probably knew that.
Jean
Seriously Dorry Baby,
what we’re you thinking when you began a post by insulting people who only wanted to help ?
Yeah, I came back later that day to change that because I decided that the language was inappropriate and not what I really wanted to comunicate.
Apologies to anyone that I might have insulted.
Ah, the temperature is nice (22 ºC), so, i was in good shape!!
Someone has insulted me???
Ok, choose the place and the weapons!!
I must see BLOODDDDDDDDD
See you soon
António
There’s a man according to my heart !
No stupid pride, no useless assertion of his ego !
Just courage, honesty and humanity, stricto sensu.
I salute you sir !
Jean
Ya… that’ll be the day !
Go find some shade Antoniò tomorrow will be another day…
(music)
Jean
:Z :Z :Z :Z :Z to each of you!
%<
Masked crime fighters ?
Nan! Too hot even for a mask…