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Bas Vellekoop

Modeling question, fillet the corners of two intersecting nurbs surfaces

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Well, in Microstation's implementation of Parasolid from a decade or more ago

you would find such in Surface Tools.

If in VW there is no way to combine/stich both Surfaces and apply the fillet Tool

in any way, in this special case it looks like a simple extruded Profile so far.

Maybe  the Fillet Tool would work on a simple 2D-ish Extrude ?

 

Another option would be SubD with "helper Edges" to control the Radius of that

bevelled Edge and finally converting back to NURBS if it should get more of a

free form later.

(Can test as VW is rendering)

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2 minutes ago, Jim Wilson said:

Do you mean something like this? I may have misunderstood which edge/direction you were looking for:

 

 

Very good idea to give it a (little) Thickness before ....

Edited by zoomer

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3 minutes ago, zoomer said:

Very good idea to give it a (little) Thickness before ....


If thats what hes going for, but didnt want the FINAL to be flat, its always possible to extract the bent/filleted surfaces and then youll be back to NURBS surfaces with no thickness. However, I shelled the original NURBS outward, which would make the resulting extract from this a bit too large, had i shelled them inward the exterior face would have maintained its original dimensions.

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a very fast sketch 🙂

Hope this explains what i want 🙂

 

@Jim Wilson @zoomer

 

Untitled-1.jpg

 

I`m able to do it is the following way,

Shell the nurbs surfaces, fillet the edges, and then extract the inner surfaces again and shell them again.

 

 

 

image.thumb.png.d1b4fb24aabe84839de5beb9fb4ac820.png

Edited by Bas Vellekoop

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Ahh I see now, much tougher. Especially defining a particular fillet since it curves in 3 axes, I'll poke at it some more and see what I get.

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Just now, Jim Wilson said:

Ahh I see now, much tougher. Especially defining a particular fillet since it curves in 3 axes, I'll poke at it some more and see what I get.

 

Yeah I know, but when possible very nice.

The way i did it now is through a detour. I would be beter if it was possible on the nurbs sufaces.

I thought i was maybe possible with the fillet tool from 2d pallet. I thought it worked on nurbs curves as well, but not sure.

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Hmmh,

so to create the whole thing from a Generic Solid first,

which has a stacked Body form so you can get your "Profile Shape"

by carefully using Fillet Tool,

(Like to get your single Arc by filleting 2 Edges until they meet and such)

Subtracting a Volume from that vertical Edge,

(so it looks like a bended Sheet Metall Body)

Finally Extract the Faces again ?

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1 hour ago, Bas Vellekoop said:

Hi guys,

 

Is there a possible modeling technique in which it is possible to fillet the 2 edges of these nurbs surfaces and give them a radius of lets say 10mm?

 

@Jim Wilson You maybe any suggestion?

 

image.thumb.png.5648c38478760096d91fd7efc306c0e1.png

fillet edges.vwx

 

I would try Model>3D Powerpack>Create Fillet Surface.

 

 http://app-help.vectorworks.net/2019/eng/index.htm#t=VW2019_Guide%2FShapes2%2FCreating_a_Fillet_Surface.htm&rhsearch=fillet surface&rhhlterm=fillet surface&rhsyns= 

 

Its a bit finicky and you may need to flip the normals or perhaps rebuild a surface using Rebuild NURBS.

 

Kevin

 

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For the first part,

for me works well :

 

- Create an Arc + a Line

- Compose

- Extrude

- Apply Fillet Tool for the Edge

 

Screenshot-97.thumb.jpg.7c3b035a887da44bdba704af7af5abfb.jpg

 

 

Of course I could have created a Polyline in one go for the Profile to extrude.

But it is nice that VW Fillet works on 2D Extrusions ....

Edited by zoomer
  • Like 1

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EDIT

 

OK, asking for that thing above to convert into a SubD - was too much.

And I don't know really what I can do with 3 separate NURBSies when converted.

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3 hours ago, zoomer said:

For the first part,

for me works well :

 

- Create an Arc + a Line

- Compose

- Extrude

- Apply Fillet Tool for the Edge

 

Screenshot-97.thumb.jpg.7c3b035a887da44bdba704af7af5abfb.jpg

 

 

Of course I could have created a Polyline in one go for the Profile to extrude.

But it is nice that VW Fillet works on 2D Extrusions ....

 

I might use this method too. You could then draw the angled edges and rounded corners on the flat surface and trim them off using the Project tool.

 

Kevin

 

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I read that such 2D-ish Objects could be cut by 3D Solids too, never tried.

And the Eraser and Cutter Tool often do things in 3D that you would not expect too.

But I think these 2D-ish are a bit of a blind alley.

When converted to Solid it seems to destroy the roundness and make it polygonal.

At least when I Thicken it with the Shell Tool.

One side stays round, the other side gets polygonal.

 

Just like in the past when I cut my Cylinder Columns from a Floor Solid.

As soon as edited the round wholes got Mesh-y

Edited by zoomer

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3 hours ago, zoomer said:

- Create an Arc + a Line

- Compose

- Extrude

- Apply Fillet Tool for the Edge

Ah, I misread your instructions. I would fillet the composed Polyline and then extrude.......

 

KM

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Yes, staying 2D as long as possible for me seems to be always a good idea.

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