Nurbs Stitching Artefacts - Please Help

[SheepFactory]

what they mean is ,

normally when you stitch , you want the cv's on the edge to be on the same level with the neighbour cv's , thats the key to a smooth line and uncreased model.

never take that one cv next to the edge and move it by itself , it breaks the tangency. select 4 cv's (2 at the edge and the 2 neighbours) and move them together so you maintain tangency.

i dont know if i confused you more or helped.

send me a mail if you want further explanation , i can send you a scene that demonstrates what i am talking about.

A|i

[Darshan]

Hi Sheep Factory,

Thanks again for your input - very kind of you, and much appreciated.

I think I modelling with the CVs in line will definitely help for the next time I model something. I'm thinking I might even redo this model and check that out, experimentation and practice is key I think... ;)

For the model I have now, what you say sort of makes sense, but still a bit of confusion. I know that tangency on a curve requires that the two hulls be on straight line, which seems to be what these cvs are trying to do. When you say to select two on one edge and two on another, do you mean vertically or horizontally ? for example, a two edges lie horizontally together. They have let's say 4 cv's each vertically. Do I select two vertical ones at top of one edge and the two on the other edge closest to it, or do I do them horizontally ? If tangency is to be maintained across U and V directions, can this be done just vertically ? (..... Wow, my head's spinning just trying to write that,.. maybe I don't know what I'm talking about,.... heheh )...
Hopefully one day it'll be clear ;)

If you wouldn't mind sending a file to demonstrate that would be perfect. Thanks.

How do I get your email address ?

Thanks again,
Darshan

[SheepFactory]

depending on the edge horizontally or vertically , doesnt matter.

its all about that 4 cv's being parallel to each other.

you can send me a mail from my profile page , i'll make a quick example scene and send it to you.

good luck with modelling ;)

A|i

[Relic9]

Ok here's how i would do that.
When i stitch nurbs patches together, i first rebuild the nurbs surfaces so that all neighbouring surfaces have the same number of U and V spans.
Then at nasty areas i first stitch the nasty isoparms together using edge stitch, then ussually there's a very thin seam, for that to dissapear i select the 2 surfaces creating the seam and then global stitch them together.
So basically i first edge stitch and then i do a global stitch.(in the global stitch properties i select the last 3 selection boxes/circles totally to the right)
This should get rid of the creases/seams.
Now manually go into Hull mode and tweak anything that has changed after applying global stitch(ussually not much).
Good luck ;)

[SheepFactory]

all of the above is the correct workflow , although i would like to add that manually snapping each cv to each other , than stitsching helps a lot.

my 2 cents

A|i

[Darshan]

Thanks for the tips, guys :)

Darshan

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