Hello Piter44,

Can you post the 3DM of your construction cylinders?

The one OSTexo links to above (http://moi3d.com/forum/index.php?webtag=MOI&msg=4388.55) is usually the way you would do thing with regular NURBS modeling tools - you need to split it in two and blend between the pieces. Also check out here for a Rhino video of the technique, you can do the same steps in MoI: https://vimeo.com/3297459

But creating branching structures is one of the things that tends to be a more natural fit for sub-d modeling techniques than NURBS modeling techniques so especially if you are going to be doing lots of branches the sub-d method could be good to use instead.

- Michael

Thank you, ed! I can't use the script((( I unpack files to Command folder, add new shortkey ctrl+q and put on name of file _SubdivClassic.
Get a mesage:




Sorry, OSTex, I removed file((( Any tube OK.

Thankx Michael, I tried this method, but still not satisfacted.

Piter -

Unzip and copy the following files to the MoI commands folder:

_ImportObj.htm
_ImportObj.js
_Subdiv_beta6.htm
_Subdiv_beta.js
_sBridge.htm
_sBridge.js
_sSplit.htm
_sSplit.js
_sScale.htm
_sScale.js

Usage:

To run the SubDivide script:
Select the object.
Press Tab, enter: _subdiv_beta6 [ENTER]


To run Split script:
Select a face or an edge.
Press Tab, enter: _sSplit [ENTER]
Move slider to size.


To run Bridge script:
Select two faces.
Press Tab, enter: _sBridge script. [ENTER]
A polygon gets created to bridge the two faces.

Assign your hot keys accordingly:
Go to Options > Shortcut keys and push the "Add" button in there. In the left hand column that says "Key" put in whatever keyboard character you want to use for launching it. Then in the right-hand "Command" column put in the same thing you are currently typing in at the command line.

Ed Ferguson

Hello,

A quick render of a pipe constructed in MoI using the Blend technique. Blends are G2.

Thanks so much, ed! I made it, but my problem is biggest.
I need not oval as in the red but curved half-circle as in the blue. When I add some edges "Subdiv" not work, message "Unsupported poligon type"
And other problem, when I use bridges, loft, extrude "Show pts" is not work((( I would like moved points before make "Subdiv".



Thanx OSTexo, great work. pls upload 3dm file.

Hi,

>I need not oval as in the red but curved half-circle as in the blue.

would be nice if you can upload your complete set of profiles, so that people can better help you...

Regards
Stefan

Hi Stefan,
Ok file attached.

Hello,

I drew a center curve through those profiles and it looks a bit rough. Is this intentional or are you looking for a smoother profile?

Piter,

I created a SubD branch to better match your tube shapes. Then I created the precision sections with NURBs using a Circle and the "D" shape profiles. Next I used Blends to tie everything together.

This was just my first attempt, so the process would need some refining to get it to look smoother.

*** Update ***

OK, after experimenting a little more, I think using Loft rather than Blend may give better continuity when connecting the SubD branches to your precision NURBs profiles. With Loft you have control over the profiles, and with careful rotation and positioning of the profile curves you can get reasonable continuity. Of course use as many profile curves as needed to guide the result - I only used three in my example. I would actually Loft the upper two branches past where you need them, then as a last step, Trim the branches to the desired length. Also notice in the bottom image I first Trimmed the SubD upper branches at an angle rather than straight across as in my earlier example.

See bottom image.

I attached the 3DM.

Ed Ferguson

agree with OSTexo

your profiles don't have a smooth sequence





also overlapping





obviously in these conditions you can't use Mike's or Michael's technique for blending






using these profiles you can get it..but you loose something




you have to plan in a better way what you want to have..it not depends by software you use... :)

M

Hello,

Fiddling around with the blending points.

to ed,
Thank you very much!!! Cool work!
Could you please upload 3dm files gold and blue/green pipes.

to Mauro,
Thank you! My profiles for only show the purpose. I need know is there alternative non-split method.

I have an idea use loft only, but don't know how make the base cylindrical. Pls advise

Just make a trim :)
But from your file I see you have not created the good curves! :)

Yes, like Pilou says try trimming the bottom area with a horizontal line and discard the bottom piece. Then use Blend to connect it with a more regular extruded or swept tube section.

- Michael

Or enlarge your ellipses curves by editing their points! :)

Piter -

Looking at the various profile curves that have been posted, I'm no longer sure what the end result should be. Do you have an image of the desired object?

From recent curves that were posted, I wonder if you are looking for something like this:





1. Make a cylinder with a circle and rectangle curve on top.
2. Trim the curves into two "D" shape curves. Fillet the corners of the two curves.
3. Edit > Size the two "D" curves slightly larger so they extend beyond the cylinder.
4. Extrude the "D" curves into the cylinder (with Cap Ends).
5. Boolean Merge, then delete the blue objects.
6. Draw and position a circle to use as a cutting object (red).
7. Use the circle to cut a section out.
8. Select the perimeter of the two "D" shape sections and extrude up.
9. Delete the floor and walls as shown.
10. Select the edges and Nsided = 0.1 (type in the value).
11. Draw a horizontal line to use as a cutting object (red).
12. Cut the top area off the solid using the red line.
13. Draw two curves to define the branches.
14. Select the perimeter of a "D" shape and Sweep it using the curves drawn in the prior step as the Rail. Repeat for the oppostie branch.

You can of course make the gap between the two branches smaller as needed.

The 3DM file is attached.

Ed Ferguson

Thank you! very helpfull!
3dm not attached, pls upload again.