Rendering glitch from 3DM file
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 From:  Brian (BWTR)
1361.10 In reply to 1361.9 
Thanks as usual Michael, and sorry for putting you to all this work.
Your suggestion that one needs to allign to the grid--for which snappimg to is not (?) required--adds another finness which I had not been aware of.
You have somethng to investigate so I will leave that for the moment.

In respect to that iges file image. The dip in the front should be, as it is, in the front, as with the 3DM file, but the curved up side should be on the right of that---not the left! VERY, VERY wierd!

Don't dispair, what a pleasure to have an app that does not crash!
Brian
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 From:  Michael Gibson
1361.11 In reply to 1361.8 
Hi Brian, here is a different method.

In this method, you don't worry so much about the circular outer boundary or inner hole of the hat brim, just try to think of it how it would look as one big rectangular sheet.

So I drew some curves:



Those are then used as the profile shapes for a sweep, the rails are the other 2 ones along the edges, that will create this surface:



Now you have the rounded outline curve that you drew:



Now trim the rectangular sheet using your round outline curve as the cutting object, and throw away the outside part:



Now trim this and the top part against each other, at this point it is good if the top part kind of sticks a little bit down through the bottom sheet, it is easier to make sure that pieces will join up properly if they push through each other and then get trimmed down to the common intersection. That creates this:



Model is attached as BRsSHat_new.zip .


The thing that is nice about this method is that there are fewer final pieces, so there is less worry about alignment between a bunch of small pieces.

Instead of trying to negotiate around a hole bit by bit, it is better to pretend for a minute that the hole doesn't exist, then trim out the hole later on.

Sometimes this is a bit difficult because it is easy to focus so much on the outlines of the final shape, it is easy to be concentrating a lot on using those outlines as direct surface construction profiles instead of as trimming profiles.

- Michael

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 From:  Brian (BWTR)
1361.12 In reply to 1361.10 
To explain the wierdness maybe?

EDITED: 31 Dec 2008 by BWTR

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 From:  Brian (BWTR)
1361.13 In reply to 1361.12 
Michael. Thank you for the zip file.
BUT, who, really, would have that "obtuse?" work flow pattern in mind?
Sorry if I am being niggly, just trying to input a thought process that maybe be applicable to us lesser mortals!
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 From:  Michael Gibson
1361.14 In reply to 1361.12 
> To explain the wierdness maybe?

I think I see - I guess Carrara decided to apply a mirror transform to the object for some reason? I don't know why though.

If you do a mirror in Carrara around the x axis, it looks like it would fix it.

- Michael
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 From:  Michael Gibson
1361.15 In reply to 1361.13 
> BUT, who, really, would have that "obtuse?" work flow pattern in mind?
> Sorry if I am being niggly, just trying to input a thought process that
> maybe be applicable to us lesser mortals!

There are a lot of benefits to working in larger sheets like that though, it is a lot easier to adjust the shape and have a smooth flowing result. If you have a ton of little fragments it can be hard to get them to connect up to one another smoothly, it is easy to have creases where they touch each other.

I guess it is just something that gets more natural the longer you do NURBS modeling.

It's kind of a warning sign trying to negotiate around something that seems like a hole instead of trimming it out as a hole.


Also, imagine that you were going to make that hat in real life - would you start with the little pieces you originally had and try to stitch them together, or would you start with a larger piece and then cut it with scissors?

- Michael
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 From:  Brian (BWTR)
1361.16 In reply to 1361.15 
No to worry, but this was my starting point on that hat rim.
Most from there, other than I thought logical, was trying to make good glitches.
Brian

EDITED: 31 Dec 2008 by BWTR

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 From:  Michael Gibson
1361.17 In reply to 1361.16 
That was a good starting point - actually by using the Planar command you create a large plane that is trimmed by those curves. It is quite similar to the kind of build-large-sheet-then-trim-back method that I showed above.

- Michael
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 From:  WillBellJr
1361.18 
Wasn't there a script posted a while back that enabled you to highlight "open" edges or something like that?

It made a good tool for checking your surfaces to see if they were closed as you expected - actually I think it was perhaps as simple as turning on points? (Or perhaps selecting certain points?) Don't remember now...

-Will
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 From:  Frenchy Pilou (PILOU)
1361.19 In reply to 1361.18 
http://kyticka.webzdarma.cz/3d/moi/
there is Select all curve closed here
---
Pilou
Is beautiful that please without concept!
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