BlendSrf Simple two NetworkSrfed Surface


#1

Tried to BlendSrf a two simple Networksrf generated surface,
but can not BlendSrf.
There’s no errors shown but the pop-up for the blendsrf comes up
just for a second but closes immediately and the command is closed.

If I cut some parts off the surface then blendsrf works ok.

Is there any limitation on using blendsrf on surface created by networksrf?

Blendsrf_networksrf.3dm (185.5 KB)


#2

NetworkSrf regularly creates surfaces which have issues for further modelling.

You can get around it by cutting back the edge and splitting it at the first knot:

Blendsrf_networksrf_01.3dm (308.0 KB)

Andy


(Pascal Golay) #3

Hi Andy - what do you mean here, exactly? If you mean they tend to be be fairly dense and not amenable to point editing, that is one thing, but this looks like a bug to me so far - do you encounter similar on a regular basis?

@Toshiaki_Takano - cutting back the edges may have a good side-effect in this case as well if you are making a curvature continuous blend - it will not dip down as it will from the edges as you have them. If you want the overal shape to be ‘fat’ and convex, then a g2 blend cannot start at the very top as you have it:

https://mcneel.myjetbrains.com/youtrack/issue/RH-40143

-Pascal


#4

Hi Pascal,

Yeah, I’ve encountered this a few times in various guises but I thought it was down to my poor understanding of some of the limits to some commands in Rhino?

Andy


#5

@2DCube
Thank you for the feedback.
I guess thel tool is a bit unstable sometimes…
Trying to make an animal shape and was thinking
networksrf might be the way.
I guess it’s ok, but I need to use other tools
when encountering problem such as this.


#6

@pascal
Thank you for the feedback and advise.
Is there some things that can be avoided to not encouter this bug?
Is it networksrf problem or blendsrf?


#7

Well, what are you trying to make? If I was trying to make a shape like that I would not use NetworkSrf, and would likely make it all as a single surface using different methods depending on the final goal.


#8

I’m thinking of modelling a cat or other organic shapes.
Was thinking networksrf might be a good start for the head and limbs.


(Pascal Golay) #9

I would say BlendSrf is having a hard time with the singularities at the corners - but that is just a guess and cannot be the whole story anyway - it works on the lower edges and it works if the surface is split back on an isocurve,

-Pascal


#10

@pascal
Ok. I’ll just play around some more.
Thank you for the support.


#11

For those sorts of shapes it’s probably easier to sculpt them with freeform point-editing from basic shapes, see the “rubber duck” tutorial in the Level 1 manual for an introduction.


#12

Thanks @JimCarruthers I’ll take a look any try out couple of solutions.