I have this corner that I think should fillet. why is it not?

corner is highlight.



version behind I made with cylinder, which I could fillet. then created straight line above and half arc, and lofted them.. this seems like difficult way of doing it.

Hi mrjynx, it's hard to give good feedback just looking at a screenshot alone, could you please also post the 3DM model file along with your screenshot? That then allows things like zooming in and analyzing geometry closely and looking at things from different angles, experimenting with different radius values, etc, etc... none of which can really be done just by looking at a screenshot alone.

One thing that may be a problem is if the 2 surface halves comes to a very shallow (like 2 or 3 degrees) angle to one another. It's a lot more difficult to fillet things that meet in a shallow angle to each other - fillet surfaces only directly touch one another along fully smooth areas, in any kind of crease the fillets do not touch end to end naturally and instead have to be extended, trimmed with one another and have a corner juncture patch put in. When the angle is very shallow these operations become difficult, with things like the corner patches being little teeny tiny slivery things and it becoming difficult to do the intersection between extended fillet pieces because they have more of an overlapping region of intersection rather than a crisp intersection line like you would get at things that meet at a more pronounced angle.

You also might try using the Rebuild command on the arc before doing the Loft or set the option for Profiles : Refit in the Loft command which will probably help to make a single smooth surface as the result of the loft rather than a potentially creased set of 2 surfaces.

- Michael

okay. I did it again using the refit option. still cannot get it to fillet.

The object doesn't matter so much as trying to understand what im doing wrong. I cant get a lot of things to fillet when I want them to. I am used to polygon modeling.

Hi mrjynx, a couple of different things here - for doing an edge fillet where you want to round off a particular edge that edge should be a joined edge where 2 surfaces are glued together.

In your attached file, your surfaces are separate objects that have not been joined together yet, so select those 2 pieces and run Edit > Join so that they have a joined edge in common and then that will be filletable if the edge is selected.

And then the other thing is to make sure you get the actual _edge_ selected and not your original generator curve objects which are still sitting around right in the same spot as the edge you want to fillet. Curves have selection priority over edges, so it will be easy for those curves to get selected instead of the surface edges. To avoid this, hide or delete those original curves (you can use the scene browser, Types > Curves section to hide all curves with one click) before trying to select the edge and that will help too.

So get those surfaces joined, and then get those original curves hidden, then you'll be able to do a drill-in click (that's where you do a second click on an object, the first click selects the whole object and then a second click selects sub objects like faces or edges) to select the edge and then fillet it.

You may want to finish off the other pieces of your object first before doing the filleting though, if you want to fillet other pieces coming off there too it's usually better to do it all in one shot so that you get corner patch generation for all junctures, you can get some problems if you only do a little bit of filleting at a time in areas where multiple fillets are running into one another since you will be creating more little edges and things like that on each separate fillet pass.


Check out here for some links to discussions and general tips for people who are coming from a sub-d / poly modeling background:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4865.2

In general you want to try and build more chunks of your model as solid pieces and then slice those solids using booleans, rather than trying to go around and build only little separate patch pieces of your model one at a time.

- Michael

Oh... yes now ive joined it and deleted the curves that were still there the edge does fillet.
This has improved my understanding greatly thanks. I will check out link.