Sorry Brian, about using FLOW to transfer the holes in the cone to the unwrapped curves.

I'm not clear how to get that done. Would you mind telling me how?

Thank you!
Gunter

Hi Gunter,
I have been unable to get flow to work on this :-(

- Brian

(with Planar)

Hi Brian & Gunter, to use Flow you'll need to build a flat surface through these curves but you need to use either sweep or network to do it so the "underlying surface" has its UV structure going in that direction. Don't use Construct > Planar for this case because that will make a large 4 point plane that's trimmed, and Flow will use the structure of the underlying surface to do its work:


If you turn on the surface's control points it should look like this with the control points hugging the curve contours, if you make it using Construct > Planar and turn on those control points you'll see it looks different with there being a large plane made up of just 4 corner points with the curves being trim curves rather than being part of the underlying surface's structure:



Also you'll probably need to cut that in half since your cone surfaces are cut in halves too.

- Michael

Please check and read the description in the posted theads.

Have a nice day
Karsten

Thanks Michael,
So that is why Karstens sweep worked for the wine bottle lable, while I could not do it using unwrap/Planar/Flow.

After applying Planar to the ConeUnwrap, the flat surface has Iso's going at an angle, which is no good for FLOW.
But the ConeUnwrap can be used, for the Sweep. First trim off the two straight sides. and use the straight side to do a sweep, with the two arcs as rails,
(which I think is equivalent to Karsten's sweep). (Then use FLOW. I have yet to try it.)
(I spent an hour doing it wrong this morning:-)

- Brian

(The bucket frustum has only one (outer surface) seam, I think.)

EDIT:
FLOW works well!
Select the two outer edges of the roundish cutouts on the cone/frustum, as Objects to Flow.
Select the surface of the frustum near Base circle, near seam, as Base surface.
Select flat swept surface of unwrap, near longer arc, near left straight edge, as Target surface.

Hello Brian,

that's it, what I tried to explain in this post: http://moi3d.com/forum/index.php?webtag=MOI&msg=8745.4. Maybe it was a to short description. Useful is also to check the uv structure of the cone and unwrapped surface with the iscocuve command. Switch from both to u and have a look to both faces. Also helpful can be to place an object e.g. a normal line or a sphere to the outside of the cone before flow curves to the unwrapped surface. It gives you later an orientation information. For simple geometry not necessary, but the day will come that you can't decide if the result is correct (complicated cutouts/asymetrics).

Have a nice day and thanks to Michael for the details
Karsten

Thank you ALL for your help. Your support is really invaluable :)

Happy New Year!
Gunter

Thank you Karsten.

My understanding of Isocurves, UV, and NURBS is improving, but more study is needed :-)

- Brian

Hello Brian,

there is no deeper understanding needed. If you want, start with the simplest form of a curve - a line with start and end point (P0,P1). You can describe every point of the curve by a parameter u in this form: Pm(u)=(1-u)*P0+u*P1 with 1-u;u as weight/blending functions. The sum of both is always 1.

Now take a second line with P2,P3
Pn(u)=(1-u)*P2+u*P3

Now create a line between the curves with a parameter v:

PS(u,v)=(1-v)*Pm(u)+v*Pn(u)

This describes a ruled surface, better a point on it.
If one parameter is constant and the other is variable, you describe a iso curve. If you use more points and want to use Bezier have a look to Bernstein polynoms ---- 1-u;u are basic ones. If you want to use other e.g. spline you have to use different ones.

Have a nice day
Karsten
p.s.: No magic, nothing mystic - very simple vector math, but some of the guys try to give it a special flavour with mystic math symbols!