How to realize this shape  1-20  21-26

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 From:  Finema
7891.1 
Hi
I've an other problem with shape and MOI.
What's the best way to do facets under a cylindrical bottle.
My shape of depart is a bottle (simple revolution) see attachment.
I would like to add randomize facets (see second attachment).
I'm just searching for a process.
Thanks in advance.
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Size: 27.2 KB, Downloaded: 18 times, Dimensions: 317x430px
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 From:  bemfarmer
7891.2 In reply to 7891.1 
Facets can be created using Boolean Diff, with planes placed at various angles and positions.
The pattern needs to be figured out. Repeat a facet cut with a rotation of the plane...
There seems to be some spiral or helix pattern?
There are 3 or 4 tutorials on cutting gemstones this way, using Rhino.

- B
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 From:  eddi
7891.3 In reply to 7891.1 
Verry fast if export's as OBJ in to Blender3d
and use -> Add Modifier -> Decimate -> Option Collapse -> Ratio with verry small value
Import back as OBJ with ImportObj( http://moi.maxsm.net/media/files/ ) from Max Smirnov and add bottle neck and bottom.

-EDDI
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 From:  Finema
7891.4 In reply to 7891.3 
@benfarmer
thanks
i would like to have diamond point
i've testesd with boolean diff but my cut are rounded..

@ eddy
thanks but i can't manage the design of the facet
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 From:  bemfarmer
7891.5 In reply to 7891.4 
I guess that every rounded-edge would have to have additional facets cut.

Of the 3 ABCarter Rhino tutorials, which use a "cube" to cut, here is one link:
https://www.renderosity.com/mod/forumpro/?thread_id=2647521

- B

EDITED: 24 Mar 2016 by BEMFARMER

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 From:  Finema
7891.6 In reply to 7891.5 
thanks but i can't reproduce my bottle example
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 From:  eddi
7891.7 In reply to 7891.6 
Do you have a customer model model as template for remodelling ???
Because you previously (first post) spoken of random facets....
-EDDI
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 From:  Finema
7891.8 In reply to 7891.6 
in fact , how i can draw facet into a cylindrical model (see attachment picture)
use Trim, other ?

thanks
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 From:  Finema
7891.9 In reply to 7891.8 
yes eddy, it's not a pattern (random but design by me) and i want to manage my facets.
thanks
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 From:  bemfarmer
7891.10 In reply to 7891.6 
There are some more photos here, including a top view, showing "unsymmetric" shape.
http://www.coroflot.com/cristiano_giuggioli/diamond

Apparently this beautiful bottle design did not win the Agua Carpatica competition (?)
https://www.tumblr.com/search/aqua%20carpatica

The light cast upon the table appears to be the same pattern, for the bottle rotated about 90 degrees.

For a skew quadrilateral, loft of opposite sides can be done, which could make a cutting surface that is not planar...

- Brian

EDITED: 24 Mar 2016 by BEMFARMER

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 From:  Finema
7891.11 In reply to 7891.10 
thanks for this link :)
but it's not resolve my problem...pointed facet on cylindrical shape :)
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 From:  bemfarmer
7891.12 In reply to 7891.11 
The glass could start as a box, but I think that the pre-faceted blank bottle should be "convex."
At least partly bulged out "conical", rather than cylindrical.
...Sphericalness or Ovalness...

- B

EDITED: 24 Mar 2016 by BEMFARMER

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 From:  futagoza (STEFAN)
7891.13 
Hi Finema,

maybe you can try the following out:

Save your model as polygon mesh, use a polygon reduction tool, re-import the reduced version,
cut off the top. Create some circles for the top and do a loft twice.

This is my humble approach which i did quickly on a downloaded slim bottle model.

Regards
Stefan


https://www.behance.net/futagoza

EDITED: 30 Oct 2016 by STEFAN

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 From:  Michael Gibson
7891.14 In reply to 7891.11 
Hi Finema,

> but it's not resolve my problem...pointed facet on cylindrical shape :)

Hmmm, I'm not sure that you're asking for something that's physically possible...

A facet is a planar piece, while the outline you drew earlier on your curved shape was not planar, right? It might be helpful if I had the 3DM file for that rather than just a screenshot.

You can carve off a planar facet from a base solid by creating a plane that intersects the solid and then using boolean difference to slice the solid with a plane. But intersecting your curved surface with a plane will make a rounded intersection with a round object.

Maybe you can describe why you're trying to start with the round object? I think you might be better off working all with faceted construction from the beginning like the examples from others above.

- Michael
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 From:  Michael Gibson
7891.15 In reply to 7891.11 
Hi Finema, maybe if you want to use your rounded shape as a guide, you could draw a few points on it using Draw curve > more > Point, and then delete it and use the points to draw lines, then form your facets by selecting the lines and running Construct > Planar to build each facet. For a 4 sided boundary that's not planar, use Construct > Network to fill those in.

- Michael
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 From:  bemfarmer
7891.16 
My clumsy model, starting with a revolved ellipse:
For the 1st cut, drew a tangent, used new mirrorsymmetry script, did 6 lofts, moved the 6 faces down a bit, and did Boolean diff.
For 2nd cut, did the same with a different tangent, and a rotate and adjust cut position down a bit.
- B
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 From:  Finema
7891.17 In reply to 7891.15 
thanks for all this solution
@ stefan > reduction polygon is really cool but i can't control the facets but i 'll use it
@ michael > draw point on my shape is the great idea because i can control facet. But how i can snap the points on my bottle ?
@bemfarmer > i 'll use your method for an other design
thanks a lot
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 From:  Michael Gibson
7891.18 In reply to 7891.17 
Hi Finema,

> But how i can snap the points on my bottle ?

Just make sure Object Snap is turned on in the bottom toolbar, and then run the Draw curve > More > Point command and click the "Repeat" checkbox, and click several points on the bottle in the 3D view - "on surface" snap will engage in the 3D view to make the points be on the surface.

If other snaps are getting in your way, open the menu above the object snap button and right click on "on surface" to make that the only active object snap type, and later on after you're done return there and right-click on it again to re-enable all the other ones.

Here's a quick example, I'm just picking points in the 3D view:



- Michael
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 From:  Finema
7891.19 In reply to 7891.18 
Thanks a lot Michael
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 From:  Finema
7891.20 In reply to 7891.19 
Hi,
How can i force planar drawing point ?
Thanks
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