Problem with filleting

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 From:  Unknown user
3643.1 
Hello,

I'm just trying to get into MoI. It's very simple and intelligent but for some tasks I run into trouble.

Like this one: Tried to make a kind of a pedestal for a collum. I used 4 profiles and ran a loft op on them. I wanted the vertical edges to be filleted for a smooth look but MoI just don't round these edges off correctly though the pedestal looks quite simple to me. Any ideas?

-Plasma
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 From:  SteveMacc (STEVEH)
3643.2 
Is the result a solid? Personally, I wouldn't use a loft in that way for such an object. You can create three solid blocks and boolean them together.
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 From:  Unknown user
3643.3 In reply to 3643.2 
Well, I placed at the top and the bottom of the resulted loft two planar planes, but yes, the object to be filleted was solid. I've tried also your method with boolean three solid blocks, but get the same poor fillet.

-Plasma
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 From:  BurrMan
3643.4 In reply to 3643.1 
Can you post the model here?
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 From:  Unknown user
3643.5 In reply to 3643.3 
An addition to my last post: I've work around the problem with lofting some pre-filleted curves (see attachment) with loft style 'loose' which works for me. But I think there must be a better solution for this, especially because the exported polygon geometry of that pedestal looks very poor.

-Plasma
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 From:  Unknown user
3643.6 In reply to 3643.4 
Here you are.

-Plasma
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 From:  BurrMan
3643.7 In reply to 3643.6 
I fillet'd this solid at .214
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 From:  BurrMan
3643.8 In reply to 3643.7 
Perhaps a better way to make this solid is to use a "rail revolve" command. Here's an example.

EDITED: 19 Jun 2012 by BURRMAN

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 From:  Frenchy Pilou (PILOU)
3643.9 
I have made this in the past :)

---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  Michael Gibson
3643.10 In reply to 3643.1 
Hi Plasma, filleting is a complex calculation and that makes it a pretty sensitive area.

When you have a lot of junctures between different edges that you are trying to fillet, that tends to make for a fairly complex filleting case because at each of those junctures the fillets from different pieces will try to be intersected and trimmed, and possibly some corner patches put in between them.

So having the fillet go through many juncture points causes it to be a complex case.

For example in your case you're trying to make a fillet that passes through all these different junctures where several edges are coming together:




Also the way fillet works, it makes for a constant radius between things, which means the fillet produced on the angled part will be somewhat smaller in size than the other ones, that's what then makes for the complexity in it then trying to hook up those various pieces. Here I've built some of the individual fillet pieces so you can see what it would have to try to do to connect those up:




So fillet is not so great for your case, it is actually a lot more complex than it looks. I also tried in 2 other CAD programs that also had problems with it as well.


Instead of using Fillet on the end result, I'd recommend filleting your original section curves (select just 1 curve and then when you run fillet you can fillet the corners of the curve) and then lofting between those (w/ Loft Style:Straight), more like this:







That's probably more what you want - the rounded part on the sloped spot is not the same as a fillet, because it's kind of slanted while fillets are more centered on a rail. But this is probably more what you want because the pieces all connect directly without them being different widths like an actual fillet would produce on the sloped section.


Hope this helps,

- Michael

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 From:  Michael Gibson
3643.11 In reply to 3643.10 
Hi Plasma, also attached here is the 3DM model file for the above.

If you want to make it rounded in the vertical direction as well you might want to do that by placing in more sections and doing them with Loft as well.

Like for example a few extra sections:



Then Loft all of those with Loft style = "Loose" :




- Michael

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 From:  DannyT (DANTAS)
3643.12 
Hi there, a bit late to the party but what it's worth, I've found through the years, not only with Moi, that filleting is a complex animal like Michael mentions, sometimes it'll work when you fillet edges in a certain order and sometimes it sorts it self out when picking all the edges, like in the video, it's a case of trying different picking orders and methods.



You can even push it to a fillet of 3.75 :)

Cheers
~Danny~
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 From:  ycarry
3643.13 In reply to 3643.12 
Mmmm... Danny I cannot read the picture :( (Safari or FireFox)
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 From:  DannyT (DANTAS)
3643.14 In reply to 3643.13 
Hi ycarry, that's strange it's a stream from screencast.com it should play, sometimes you have to wait a little for it to load.

-
~Danny~
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 From:  BurrMan
3643.15 In reply to 3643.13 
Hi ycarry,
Go to divx.com and install their video codecs and you will be able to view the movie...
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 From:  BurrMan
3643.16 In reply to 3643.14 
Hey Danny, It's the avi thing.
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 From:  DannyT (DANTAS)
3643.17 In reply to 3643.16 
Ah yes, thanks Burr, maybe I shouldn't assume everyone has all the codecs :S

P.S. Late night Burr or should I say early morning :)

Cheers
~Danny~
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 From:  BurrMan
3643.18 In reply to 3643.17 
Early morning D...Alot going on over here....wish me luck!
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 From:  ycarry
3643.19 In reply to 3643.15 
Hi BurrMan,
divx codec installed, picture now fine. Thanks!
8^p
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