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 Post subject: Fillets in Rhino
PostPosted: Thu Nov 26, 2015 12:18 pm 
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Cocobolo
Cocobolo

Joined: Mon Mar 03, 2008 6:51 pm
Posts: 488
Anyone have a source for techniques to trick Rhino into doing complex fillets? IMO the fillets I'm trying to do aren't all that complex, they just break Rhino's rules for filleting.


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 Post subject: Re: Fillets in Rhino
PostPosted: Thu Nov 26, 2015 5:00 pm 
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Joined: Mon Jan 28, 2013 8:29 pm
Posts: 111
First name: Rand
Last Name: Kennedy
State: CO
Focus: Build
Status: Semi-pro
I usually try smaller and smaller sizes until it works, just to show that it is a radius fit type issue first. Surface complexity, especially where there is shrinkage like in the cutaway horn area, has been my most frequent problem. Sometimes a variable radius fillet, going smaller radius around impossible areas helps and isn't visible. Generally, I've found the fillet failure to be a diagnostic of something I need to go back and fix with the number of curve points or smoothness and then surfaces. IIRC a fillet is just a sweep of a tangent arc to both surfaces of the specified radius and a trim. If that sized arc won't fit into an area its going to fail to complete.

A couple of resources (I'm sure there are lots more):
https://vimeo.com/20574446
http://wiki.mcneel.com/rhino/advancedfilleting



These users thanked the author RandK for the post: Sheldon Dingwall (Fri Nov 27, 2015 12:42 pm)
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 Post subject: Re: Fillets in Rhino
PostPosted: Fri Nov 27, 2015 2:11 am 
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Cocobolo
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Joined: Wed Jan 08, 2014 7:58 pm
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First name: Leo
Last Name: Pedersen
City: Bowen Island
State: British Columbia
Zip/Postal Code: V0N 1G2
Country: Canada
Focus: Build
Status: Amateur
Might not be exactly what you're looking for, but the t-splines plugin for Rhino is great for smooth transitions between complex surfaces.


Sent from my iPhone using Tapatalk



These users thanked the author Durero for the post: Sheldon Dingwall (Fri Nov 27, 2015 12:42 pm)
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 Post subject: Re: Fillets in Rhino
PostPosted: Fri Nov 27, 2015 2:19 am 
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Cocobolo
Cocobolo

Joined: Wed Jan 08, 2014 7:58 pm
Posts: 147
First name: Leo
Last Name: Pedersen
City: Bowen Island
State: British Columbia
Zip/Postal Code: V0N 1G2
Country: Canada
Focus: Build
Status: Amateur
Found another interesting plugin that includes complex fillets: http://www.npowersoftware.com/rhino/proverview.htm

Haven't tried it myself yet. If anyone else does then please share your experiences.

Leo


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These users thanked the author Durero for the post: Sheldon Dingwall (Fri Nov 27, 2015 12:42 pm)
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 Post subject: Re: Fillets in Rhino
PostPosted: Fri Nov 27, 2015 12:41 pm 
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Cocobolo
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Joined: Mon Mar 03, 2008 6:51 pm
Posts: 488
Thanks guys. I'll take another look at t-splines. It looked promising a while back but I can't remember why I decided against it. npower looks interesting too. One of my filleting problems stems from fillets that self-intersect.


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 Post subject: Re: Fillets in Rhino
PostPosted: Fri Nov 27, 2015 3:26 pm 
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First name: Rand
Last Name: Kennedy
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Focus: Build
Status: Semi-pro
You might post a picture of what's being a pain. The experts on the McNeel forum would certainly help if you uploaded an example file (nothing proprietary) there.

I don't see T-splines as being helpful to make a fillet of a nurbs model. T-splines are cool for making shapes, although you can make a surface and not just a solid, but are generally not well suited for things needing mechanical precision and the edges cannot be attached to nurbs edges. They can be converted to nurbs and then trimmed up and made a part of a mechanical model. They released a new version 4 this year but never fixed some serious bugs in it and it seems to be unsupported while they focus on the T-splines functionality that is part of Autodesk Fusion 360. If you really want to use T-splines, consider Fusion instead of buying what might be a dead-end plug-in.


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 Post subject: Re: Fillets in Rhino
PostPosted: Sun Nov 29, 2015 5:13 am 
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Mahogany
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Joined: Mon Aug 20, 2007 2:25 pm
Posts: 52
Location: United States
Hi Sheldon,
I'm still learning and watch everything I can about Rhino. I just noticed this. He talks a little about a
"force" fillet.
Maybe there is something here for you.
https://youtu.be/uVyt3oGFRIQ



These users thanked the author Saul Koll for the post: RandK (Sun Nov 29, 2015 11:34 am)
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 Post subject: Re: Fillets in Rhino
PostPosted: Sun Nov 29, 2015 12:00 pm 
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Joined: Mon Jan 28, 2013 8:29 pm
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First name: Rand
Last Name: Kennedy
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Focus: Build
Status: Semi-pro
Still learning here too ! Cool video, I'll try to find time to watch the series. So he forced the fillet by sweeping an arc. He uses a better method of constructing the arc.


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 Post subject: Re: Fillets in Rhino
PostPosted: Sun Nov 29, 2015 1:05 pm 
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Cocobolo
Cocobolo

Joined: Mon Mar 03, 2008 6:51 pm
Posts: 488
Wow, that guy works fast! I'm going to need to watch this a few times. Thanks Saul


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 Post subject: Re: Fillets in Rhino
PostPosted: Sun Nov 29, 2015 7:17 pm 
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Mahogany
Mahogany

Joined: Mon Aug 20, 2007 2:25 pm
Posts: 52
Location: United States
Sheldon Dingwall wrote:
Wow, that guy works fast! I'm going to need to watch this a few times. Thanks Saul


You're welcome!

Yeah, me too! Need to watch again. Lot's of ideas to process. Always new tricks to be learned. That's the thing about Rhino, there are many ways to get the same result.


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 Post subject: Re: Fillets in Rhino
PostPosted: Mon Nov 30, 2015 10:06 am 
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Contributing Member
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Joined: Mon Jan 28, 2013 8:29 pm
Posts: 111
First name: Rand
Last Name: Kennedy
State: CO
Focus: Build
Status: Semi-pro
http://www.rhino3d.com/support
"unlimited support is included with all McNeel products"

You can upload a file to them with real work and they will email back to you. Confidential. Somebody like Pascal who is a Rhino expert and experienced industrial designer will help. Then again maybe you found a bug they'd like to hear about.

So much sanding.... so little time.... Good luck


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 Post subject: Re: Fillets in Rhino
PostPosted: Fri Dec 18, 2015 7:59 pm 
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Walnut
Walnut

Joined: Sat Feb 14, 2015 3:06 pm
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First name: Scott
Last Name: McKee
City: Cumberland
State: BC
Zip/Postal Code: V0R 1S0
Country: Canada
Focus: Build
Status: Semi-pro
I've just discovered two new to me commands.

VariableBlendSrf
http://docs.mcneel.com/rhino/5/help/en-us/commands/variableblendsrf.htm

VariableFilletSr
http://docs.mcneel.com/rhino/5/help/en-us/commands/variablefilletsrf.htm

Which look like they may prove pretty useful



These users thanked the author smckee for the post: Durero (Fri Dec 18, 2015 9:05 pm)
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 Post subject: Re: Fillets in Rhino
PostPosted: Sun Dec 20, 2015 8:42 pm 
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Brazilian Rosewood
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Joined: Tue May 02, 2006 9:02 am
Posts: 2347
Location: Canada
First name: Bob
Last Name: Garrish
City: Toronto
State: Ontario
Country: Canada
Status: Professional
The newsgroup or directly contacting support are great ways to go. I got some amazing tips when I was getting started with Rhino (XX,XXX hours ago...) from newsgroup help with models I was making that pushed me far ahead of what I'd have learned on my own.

The 'force fillet' thing he did is a good trick. I've done something pretty similar, but I didn't know of the pipe command which really speeds up the trimming process, so always something new to learn!

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Bob Garrish
Former Canonized Purveyor of Fine CNC Luthier Services


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