Hi,

Pls advise.

I use loft



I choose all ovals



I make two lofts



How make ONE loft smooth?

Hi Piter44

http://www.ntu.edu.sg/home/myycai/paper/ye2002-cagd-vol19-pp.513-531.pdf

I think the "triangular" holes can be filled with Nsided. Have not tried this yet...

?

- Brian

Edit: Also tried one Nsided with 6 sided hole:

Thank you! I have chose three oval and click Nsided, but calculation failed.

Nsided requires closed set of EDGES. See edit of prior post.
Must return to work now. More play tonight :-)

- Brian

Thank you! But too much edges. Is there other method?

Hello,

Here is a thread demonstrating one technique:

http://moi3d.com/forum/index.php?webtag=MOI&msg=4388.55

Oops, I should have said blend Edges first, then try Nsided.
I think the transition zone I did should be longer, (or taller).

Signing off
-Brian

Thanx OSTexo, I saw It, but loking for other method with less edges. I need very smooth bifurcated.

Thanx Brian. Pls advise non-split method.

Hi Piter -

I think branching is not an easy thing using Nurbs.

So, I tried using the SubD scripts available to MoI. You can then build off of this object using Nurbs tools.

You’ll need to first install Max Smirnov’s SubD scripts. See the links below:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6674.51
http://moi3d.com/forum/index.php?webtag=MOI&msg=6674.173
http://moi.maxsm.net/
http://moi.maxsm.net/media/files/ (The file names are download links, click to download the scripts)

I recommend adding dedicated buttons to run the SubD scripts. See:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7245.69

1. Start with a solid box.
2. SubD split it down the middle.
3. Select one of the top faces and extrude at an angle.
4. Repeat extrusion for the opposite face.
5. SubD to turn it into a "blob". Note: At this stage you can also Show Points and manipulate the shape if needed. I did not need to do this.
6. Trim the top and bottom off the "blob" using horizontal lines as cutting objects.
7. Select the "blob" and Planer to cap off the tubes.
8. Select the "blob" and use the boundary box sizing handles to squeeze into a more oval shape, and also stretch it taller.

I attached the 3DM file if you want to experiment.

Ed Ferguson

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