Why is a NURBS circle not round?

Support Modeling
#1

Hi,
this probably is a really simple question.
To recreate the problem please follow these steps:

  1. With Blender open, create a default NURBS circle
  2. go to top view (NUM7)
  3. rotate it around the Z-axis (r;z;then move your cursor)

As you will see, it is not perfectly smooth.
Now 2 questions:

  1. Why is it not smooth?
  2. How can I make it perfectly round?

Thanks in advance,
tillonius3002

#2

You cannot make it perfectly round, but you can increase the resolution under the object data settings in the properties tab.

#3

Increasing the resolution doesn’t seem to help much.

I think it is lumpy because it is basically a square. Try subdividing it in Edit Mode a couple of times (3 or 4), then use SHIFT+ALT+S in Edit Mode to make the subdivided (square shaped) curve circular.

#4

Thanks, this basically works, but I wanted to use it as some kind of door, which rotates. Thats why it has to be round. It now is, but if I turn off cyclic, the opening is smaller. It could convert it to a mesh, and then make it bigger with a boolean, but if I want it to stay a curve, how would I do that?

#5

How does it work as a door? Can you use a curve circle ?

#6

can you show a pic of what you mean here !

i did a test and added a nurb circle and a circle and it’s the samething
so don’t see what you eman when it is ot rounded !

salutations

#7

Ok, back from vacances, I wanted it to be like it works now.
Thank you! :smiley: