Hi Marco, unfortunately the shell command in the geometry library is not very robust, there are a lot of things that can get it confused. There is probably some case where it's the reverse from what you show.

But it is true that shelling can be simplified with more pieces that match up naturally edge-to-edge, so if you are focusing on using that it may be worth a try. But really if you need to do a lot of shelling, MoI's shell function is probably not going to do the job for you in many cases, so you may need to do your shelling in some other program for now.

Another way you could make things easier for shelling could be to build more of your part all from one larger Loft rather than doing it in separate pieces and blending, if you want it to look like one large flowing surface. See the attached file where I used Loft with the Loft style = "Loose" option to build the starting piece.

- Michael

Hi Michael,
I took Marco's file from this post here:

http://moi3d.com/forum/index.php?webtag=MOI&msg=7912.13

And shelled it .1 (He said it failed)

Doing a drilldown selection of that top surface, the success or failure can be achieved by the selection position.



Not sure if that can help you find anything on your end or not.

Thanks Burr!

- Michael

Here's an example of a failure with a simple fillet on a seamless curve.

Also, in most cases you'll find meshing for export works better leaving the seams as they are.

ymmv

Hi Michael and BurrMan,

Thank you both for your help!

From Michael's previous post :

> Another way you could make things easier for shelling could be to build more of your part
> all from one larger Loft rather than doing it in separate pieces and blending,
> if you want it to look like one large flowing surface.
> See the attached file where I used Loft with the Loft style = "Loose" option to build the starting piece.

Thank you very much for your suggestions and for giving me a different point of view.

Now....a strange thing that, believe me guys, is driving me crazy!

From BurrMan's previous post :
> And shelled it .1 (He said it failed)
> Doing a drilldown selection of that top surface, the success or failure can be achieved by the selection position.

Well....
I reloaded the file that i posted in http://moi3d.com/forum/index.php?webtag=MOI&msg=7912.13, and, worked on it many times....

As shown in this current attached picture (curveRebuild3_B.png), if i try to shell the original object marked as "Solid 1",
the shell command is always correctly performed, regardless of selected area on the top surface.

But...if i do the same thing on the cloned copy of the "Solid 1" the shell ALWAYS FAILS!!!
Also, like before, regardless of selected area on the top surface!!

WHY ?????

What the cloned object (copy...pasted or ctrl dragged from the original), has in it that leads the shell command to fail ???

At this point, i'm not understanding anything more...

Please help !!

Nice day to everyone,

Marco.

Hi danperk (SBEECH),

and thank you for your help!

I wanted to do a try by myself and i got the results summarized in the picture example4_capture.PNG that i'm posting here.

In effect the shelling on the extruded object with no internal edges fails with a radius of 2 but works well with radius of 1.5.

I think that this behavior leverages on the internal more complex structure of the object without internal edges.

If i understood correctly Michael's explanations, in this case the internal edges, help Moi to achieving the task.

Nice day,

Marco.

Hello Marco,

the problem is here:




I don't know which method you have used to create the blendings, but the highlighted edges are splited in three segments.(One big and two small ones left and right) Select the 3 edges, hit tab, type merge and Enter for both edges. Then shell:-)

Have a nice day
Karsten

Hi Karsten (KMRQUS) and Michael,

and thank you very much for your help.

Unfortunately, this isn't the first time that i forget to check the topology of the edges, before continue to try to do what i want to achieve...

Then, i thank you Karsten for reminding me the existence of the Merge command :)

Now, it's not my intention to bore, you or Michael, with strange and unverifiable issues,
but i observed a strange behavior that occurs to the Shell command,
in relation with the position of the mouse pointer and the zoom level,
and camera position while confirming the input of the selected area for that command.

I made this tests on the same object indicated by Karsten, but without first executing the Merge edge command.

Well...sometimes the Shell command works and sometimes not,
depending on the zoom level and camera position in 3d view and
if the MOUSE POINTER IS OR NOT OVER THE SELECTED AREA THAT ACT AS STARTING POINT for the shell command.

Or, at least, this is what i'm observing.

Sad to say that i'm not able to reproduce this issue in a stable way.
If any of you want to try, please give me the chance to verify what i'm saying.

Is any of you is aware of this behavior ?

The zoom level in 3d view or the camera position and angle has some sort of influence to the Shell or other commands ?

Thank's for all and have a nice evening,

Marco.

Hi Marco,

> The zoom level in 3d view or the camera position and angle has some
> sort of influence to the Shell or other commands ?

No, not as far as I know. It's probably some bug using uninitialized memory, bugs in that category can be difficult to reproduce and can exhibit semi random behavior.

- Michael

Hi Michael,

Thank's for your support.

Although it is a bug, i'm glad to know that is not a sort of strange influence involving the camera or mouse position,
and the normal execution of the commands.

Ciao!

Marco.