NURBS CURVES! Why the heck should I use them?.
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- Опубліковано 2 жов 2024
- Why would you want to use NURBS curves instead of bezier curves? Well, they have advantages when you want to generate a subdivision surface when using a curve as a starting point.
To see a tutorial where NURBS are integrated into the modeling process, see this link: • Part 1, Sardines Can P...
#blender3d #NURBS #bezier
A lot of your videos are basic but very special knowledge that seemingly no one else puts out in tutorials - very nice and useful for new creative ways to do things.
It's easy to gloss over the fundamentals but this is the kind of stuff that takes our work to the next level :o
Thank you so much. After aimlessly following numerous tutorials, it's so refreshing to finally understand how Blender works.
Really appreciating your videos. Despite the tens of thousands of Blender tutorials on YT, videos that actually explain functions are extremely rare. You obviously know what your talking about. Just subed.
Hi Christopher!
After almost 30 years working with (other) 3D tools, I finally took the step to start with Blender.
And I can't be happier. I want to thank you especially for your videos: they are absolutely wonderful. I love how well you explain everything, and with what depth and clarity.
Thank you so much for sharing your knowledge!
A big hug from Spain!
You are like the Stephen King of Blender, Christopher...and you rock!
Great tutorial on the use of curves! If you want to go full nerd on why these curves types are different I highly recommend this video - ua-cam.com/video/jvPPXbo87ds/v-deo.html
I thought I recognized that voice! Didn't know you did Blender tutorials. Your Strata Design videos were extremely helpful back when I was getting into modeling for the first time. Glad to find you on youtube!
Thank you so much! I had no idea why my nurbs curves didnt show up, but after this video i understand :)
Every 3D software user have been said for years about use NURBS for precision but now I can see that Blender is an exception.
Why would it be an exception if the conclusion of this video is that NURBS curves are good for precision and maintaining the same form as it is matching the subdivision pattern?
so helpful info and great teaching, thank you!
So fully understandable and useful. Thank you.
You mentioned that Bézier courves have points on the curve itself but is that really the case? I thought that Bézier curves are not interplotating but aproximating curves.
when i shrinkwrap the curve to a surface instead of it following a smooth line it follows the lining on the surface?
Really well explained. Very simple use case but very important.
none of the vid explained the real reason you would want to use a nurbs anything. Like... why was nurbs invented, iow. In what instances/cases/situations would you naturally go with nurbs? Is it because it makes a curve with less memory than polygons? I have no idea!
I did explain why you would use a NURBS curve in this case, in fact it's the central focus of the video. Because it allows you to match the curvature of the template better than a bezier curve when it came to generating a subdivision surface.
@@christopher3d475 Ok, so... are you saying that the curvature matches while it's still a bezier curve and then after converting to a mesh, the curvature changes but the nurbs curve does not? That's the benefit? I know very little about nurbs but I had this impression that it was better to use for curving surfaces where you had maybe a curve curving INTO another curve. I thought there was more to nurbs than how well it retained its shape after turning it into a mesh (which I thought was the opposite of what you did with a nurb). ? anyway, I was trying to find a vid giving the MAIN reason why a person would model something using a nurb thing and to me, this looks like only a very isolated case but what do I know? thx
Anyone figure out if/when Blender will let you fix this 'bug' with the U order, mine always sticks at 2
I've reported it as a bug, you could also report it, the multiple reports would catch their attention.
@Christopher 3D - Glad to accidentally discover your channel via one of your shorts. Coming from Solidworks I know less than zero about curves in Blender but want to learn. I create custom scenery for Microsoft Flight Simulator, exported via Blender. A question that just popped up is, do bezier, NURBS, etc., curves need to be converted into a mesh to be compatible with other programs? I'm guessing Blender curves are more efficient (less polygons) than highly subdivided mesh equivalents? BTW just subscribed.
Regards from Thailand! 😁
That's a good question. Typically curves aren't transported with older polygon formats. But I just did a test and NURBS curves did transport with Alembic. Ultimately it depends on what you are needing to do with the curves, if the importing application supports them, etc. So it's really a use-case scenario thing that we'd need to define.
@@christopher3d475 Thanks for the quick reply. I guess I'll create a couple of test models to see if Blender curves will import into the sim. Sadly, many of Blender features/entities aren't compatible with the sim since it's integrated so tightly with Autodesk's 3ds Max. This is especially true for some Blender nodes. Yep, it's always a gamble when I try something new in Blender. Thankfully, the situation usually gets a little better with each new sim SDK update. 🤞🤞
I like NURBS curves
Too bad that blender never tries to improve their nurbs tool set
For hard surfaces modeling it is defeating subD modeling.
One does not need a replacement for rhino inside blender but some basic tools which could be all pulled from openCascade
Yes I agree, some NURBS surface modeling functions would be a good addition. I use MOI now and then for this reason.
@@christopher3d475 moi oh yes - plasticity is making a big impact too
It has top surface tools now
@@cekuhnen Yeah, I've been meaning to go over and take a look at Plasticity.
@@christopher3d475 do it it has good DM tools
I've always wondered about Nurbs but never really understood them as the other videos I found were somewhat meh and then again forgot about Nurbs again and didnt care about them for a good while and the process repeated for few times until I found your video! Liked, subbed and rung a bell.
Thank you for the video! Do you know if there's way to have a NURBS curve pass through the control points?
Once again, just BRILLIANT! Your channel is like a gold mine, full of extremely useful explanations and information. Thank you. Dg
Since the NURBS control points are equivalent to the subdivision cage verts, is there an advantage to doing this tracing with a NURBS curve, as opposed to directly using mesh verts/edges (with subdivision active)?
No, that works just as well.
@@christopher3d475 Thanks for the reply. Your videos are helping me a lot!
Thank you! Great piece of info.
is it only me or the curve point only extrudes in a straight line? never moves on z axis
Make sure it's set to 3D mode. 2D mode only operates on a 2D plane.
@@christopher3d475 it worked, thanks a million
Extremely useful and saved me a lot of trouble. Thanks very much
That was stone excellent knowledge shared right there. Thanks Christopher!
Nurbs in blender is a joke.....LoL.
I did not know about this equivalence!
mark area , and changed cycle by curve?
unbelievable tutorial, thank you
Hats very usful to know thanks
Thanks for the great explanation!
This was fantastic 👏
Thank you.
Is there a way i can convert a subdivision surface into nurbs and ia there a way i xan export that nurbs aurface to for example dfx so i can put it in revit or something :)
I have made a nurbs curve, yet everytime I duplicate it and moved.. Iam still liked to the first one and cant edit it in anyway even after i convert ti to a poly mesh.. what am I doing wrong, cant find anything on it
You probably duplicated it with the Duplicate Linked function. So when you edit one, the other changes also. You can unlink the two by going to Object Data Properties, and at the top you'll see the name of the object data and a number representing the number of times it's linked. Click that to make it its own unlinked duplicate.
thank you for your response.. also, I did a little tutorial on knife project and it worked the first time.. since then, knife project will not work at all.. Iam runninng into weird issues trying to work in blender.. any help would be greatly appreciated..
@@christopher3d475
Your theme colors are like eye candy. Is your theme available openly?
Yes, it's just the Blender Light theme, built in.
way to go thanks@@christopher3d475
Wonderful
Excellent tutorial again! But why trace with a NURBS curve when you can trace with a subdivided polyline to begin with?
You certainly could do that and just apply a subdivision modifier to the polyspline and it essentially becomes a NURBS curve. I did it to show people why using a bezier curve isn't always ideal and what the relationship between NURBS and subD is.
@@christopher3d475 NURBS curve and SubD polyspline being essentially the same is really cool, and the video demonstrated that very well 😃Keep up the good work!
your interface preferences are horrifying, good tutorial though
Curves don't show up well on the dark interface, hence the reason for the light interface where they're much more visible for tutorials.
the themes should need a overhaule...
I had the same problem even in the animation data area editors ....
you change resolution? yes, what I suggest is,no problem these day.
I honestly have never used NC's. Looks like I've learned a new valuable skill as well as found a new channel. Great video sir.
wow...
thx, underated topic even blender had basic curve tools .....
💪stable ....💣💥🗯💭💨