Hi there,
I have a rather complex OBJ object, which i try to import im moi. I use the OBJ23DM converter tool, and it works great.
I import with the option "import closed shapes", so far all works well. But since its no surface, I take another step, select all
the curves and and use the "create planar face" on the whole. Now the strange thing happens: Most of the closed curves
turn into surfaces, but some not. Strangeley they even refuse to be turned into surfaces when i select them manualy and
click on create planar surface. Even stranger: When i isolate one of these closed curves (the objects in question get listed as
closed curves) and then try to draw another curve or such, the snaping function ignores it. In other words: surrounding
objects get recognized by snap and the cursor snaps to them, these curves not!
Anyone any ideas what the problem here is?
Best regards,
Heiner

Hi Heiner, the "create planar face" function will only work if the curves you give it are both closed and planar, you need both of these conditions to be true not just being closed alone. Polygons in OBJ files are not restricted to only be planar, so most likely the ones that are not working for you have some slight warping to them and are not totally flat polygons. It's not that unusual for quads in polygon mesh files to not be totally planar.

Typically it just does not work very well to try and convert a complex high density polygon mesh file into a NURBS object by making one little individual surface for each source polygon, it looks like that's what you're trying to do here...


> Even stranger: When i isolate one of these closed curves (the objects in
> question get listed as closed curves) and then try to draw another curve or such,
> the snaping function ignores it. In other words: surrounding
> objects get recognized by snap and the cursor snaps to them, these curves not!

Could you export some of these unsnappable objects to a small example file and then attach the file here so I can take a look?

- Michael

Hi Michael,
you are right, thats what i try to do. I just need a rough Nurbs model for a
cost estimate purposes. An these guys there can only deal with closed surfaces.
However, i will have to do a reconstruction of my model anyway, so they will have
to wait for the finished model.
With the non snapping objects: I got the solution here. The snapping was set to
elements which are not present in the isolated geometry. So it could not snap at all.
Best regards,
Heiner

Hi Heiner, yes re: non snapping - you must have been referring to center object snap on those ones. A closed and planar polyline curve will have a center snap at the centroid so that you can snap on to the center of things like square or rectangle polygons and things like that. If the curve is not planar that particular snap point won't be present though.

So that's probably just another side effect of some of the polygons being non-planar.

- Michael