It appears MoI combines coplanar planes into single faces when I Loft (straight/exact) these polylines in a single operation (Orange Surface).

This breaks the ability to SubD the lofted surface using Max's SubD script.

If I Loft just a pair of polylines at a time, then join the resulting surfaces, I get the expected grid result and it will SubD (Red Surface).

Of course this is inefficient compared to selecting all the polylines at once and performing a single loft.

Is there a way to preserve individual faces in a Straight/Exact Loft from Polylines?

Sorry, no forum space left to post file.

Ed Ferguson

Hi Ed, so yeah what actually happens is that Loft internally generates one single long surface initially and then if there was a uniform segment count in the profiles it's divided at the segment endpoints in the profiles direction and then additionally at any areas where there are creases.

I've got it fixed up for the next release so that with Loft style = "Straight" it will make sure to additionally split it at any internal knots in the loft direction so that coplanar areas will be divided too.

Thanks, - Michael

Hi Ed, for now a workaround instead of doing a pair at a time is to select the result of the loft, run Edit > Trim, select all the loft profiles as cutting objects and set the "Keep all joined" option in Trim. That should dice up the coplanar areas.

- Michael

Thanks Michael -

Appreciate your adding a solution to the next release. This will make these types of Lofts SubD friendly.

I'll use the workarounds in the meantime.

Ed Ferguson

LineWeb don't make the job ? (not tested)

http://moi3d.com/forum/index.php?webtag=MOI&msg=3666.1

Michael:
working on this stuff,can you add a button on SubD menu to convert objects directly with option:more patches-less patches ?
No export and re-import
No go to preferences and select more or less patches
All in a window,istant feedback :)


Ed suggested this on my previous post ;)

M

Hi Mauro, yes I do want to make that type of planar face converter in the SubD create menu. I'm not sure exactly when I'll be able to focus on some new SubD stuff yet though.

- Michael

Pilou -

I made that test using LineWeb.

The issue is, the Loft function combines any coplanar planes into single faces, regardless of what method was used to construct the loft polylines. And that breaks Max's SubD.

Although I think if you export the OBJ, re-import and use Michael's SubD, it works. However as Mauro points out, that's a long back-and-forth process if you're tweaking a design.

Ed Ferguson