Hi Guys! I'm newbie in Moi3D. I bought some days ago and I use Moi V4 beta in macOS.

After a lot of tests I can't found the correct way to realize the correct shape.
I found some problem to use fillet (to smooth edges) and the correct way to create a surface that start from rectangular base to semi-ellipse base.

So, I fixed the shape into MODO and come back to MOI3D with this result. But i want to learn how create this simple mesh only inside MOI3D. Are there any tricks or any tutorials to explain these problems?



Thanks!



Diego

Hi Diego, can you please post the .3dm model file of the object that you are having difficulty filleting?

Thanks, - Michael

Hi, as requested please find attached 3dm file

Thanks!

Hi Diego, you should be able to fillet the top edges ok, like this:





The bottom edges will be difficult to fillet because of how your geometry is configured with this side coming close to being smooth:



Fillets can only be calculated on sharp edges, on smooth edges no fillet can be created and on edges that are very close to being smooth it makes things quite difficult on the fillet generator because the fillet will shrink to an extremely small fragment in those spots.

So often if you want to fillet something you need to construct it will all distinct sharp edges throughout and not have some edges that are to be filleted come close to being smooth with the surfaces on either side of the edge rather than distinctly sharp.

I'll try to come up with some recommendations a bit later.

- Michael

Hi Diego, so usually it's good to apply fillets at the end like you were trying but in this kind of a case where it's going to be difficult to fillet because of what I described above you could fillet the end rectangle bottom corners first and then generate a surface from that. That will make the area that's difficult to fillet later on to be already handled with the loft blending between shapes.

That looks like this:

Curve setup, rectangle and half ellipse built off of a centerline:


Fillet bottom corners of rectangle, I used radius of 0.08:


Loft bottom rectangle with fillet (joined as one curve) with ellipse:


Select end curves and use Construct > Planar to make end caps:


Join surfaces together, select and use Construct > Planar to fill in top:


Now fillet using a little smaller radius than on the rectangle (I used radius 0.05), so there is space for the fillet to fit in this area:


Result:


Hope this helps!

- Michael

if you copy paste some borders of your piece ... and zoom ... you'll find small hole ... and so no fillet possible






draw profile & offset ( small or large ) sweep an arc along the profiles

this give couvercles ( rectangular and semi circle )

then loft between profile

you can do various size of sweep sections to obtain large or small fillets

file here

Hi,
attached is a method that allows for the 0.25 radii prior to adding a fillet.
Create a elliptical arch and a goal post loft using the exact option.
Loft the side edges,join surfaces then planar to close to a solid.
Add 0.25 radii then select edges to fillet and apply fillet size you require.
Hope this helps
Barry

Hi,

my proposition is :
Fileting before lofting...

You filet your profiles.

You loft without cap.

You use a blendcap.

Brilliant!

why not just built it with a variable fillet? front is a fillet on the corners then the bottom edges minis the very back edge you run a small fillet and then with the same operation make your larger fillet as a variable and then finish up with the rest a as a small fillet. so make a box with three fillets.

The problem with variable radius fillet is it will leave the end profile as a rounded rectangle instead of an ellipse shape.


- Michael

If the arch at the back is the most import criteria then I would do a simple loft of two lines, trim the loft for the front radius make it's mate as a plane loft the two planes together (leaving enough room for a fillet) and then fillet the whole thing.

I really appreciate all techniques! Now i'm going to try all!

Thanks!