G1 Fillet - Seem discontinuity.

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 From:  PaQ
5376.1 
Hi Michael,

No sure if only the last beta is affected by this, but G1 fillet show some discontinuity problem in this simple example :
Metalic lighting is better to see the problem.

EDITED: 4 Dec 2015 by PAQ

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 From:  Michael Gibson
5376.2 In reply to 5376.1 
Hi PaQ - it's one of the various fillet problems in the geometry kernel - occasionally the end portions of fillets are not fit quite tightly enough to be totally smooth.

It probably happens in that particular case because the immediate area of the fillet at the closure point is not very curved, so the fillet surface is lighter there and didn't get enough points to make a good end shape.

There isn't a whole lot that I can do about it anytime soon - it's a difficult area of the geometry library to tinker with.

The proper way for something like that to be generated would be with a periodic closed surface generator, which the geometry kernel unfortunately is lacking. I made a custom one myself in order to do smooth closed lofts properly, but it's not so easy to retrofit that back into the kernel and also continue to take other updates.

- Michael
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 From:  Michael Gibson
5376.3 In reply to 5376.1 
Hi PaQ, actually I'll try to experiment a bit with swapping out the low level surface generator mechanism with my periodic one. Maybe I will be able to do that without introducing too big of a maintenence problem.

One general problem with tinkering with too much of the geometry library myself is that it can then get pretty difficult to merge in new updates and fixes later on.

This same problem can happen with closed sweeps and blends too as well as fillets, maybe if I can tune it up in one key spot I can improve all of those in one shot, it's worth a try anyway.

Before I was thinking that it would be too difficult to mess with the fillet generation code itself, but now I'm thinking that maybe I can tune it up in the general purpose surface lofting code instead.

- Michael
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 From:  Frenchy Pilou (PILOU)
5376.4 
The Team of the creator of the library geometry kernel is always working on it ? Or the development is very slow ?
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 From:  Michael Gibson
5376.5 In reply to 5376.4 
Hi Pilou, they are working on it but big improvements tends to be pretty slow though.

- Michael
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Message 5376.6 deleted 9 Sep 2012 by BURRMAN
 

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