Problems with fillet edge, and objects not intersecting questions

So, bear with me, I’m still pretty new. My question in relation to the file presented. How come when I fillet edge a extruded object with caps the fillet edge is working differently than intended here. 1. The output was not trimmed and joined. I trimmed the edge containing the filet, which happens to be extended with the fillet command somehow. So I split the fillet surface that was made, and split the solid with the fillet surface. This worked for 3 of my objects. A couple worked as they should have, by auto trim and join, fillet, etc.

Now on the last inside edge fillet, it does not intersect. I cannot see where I went wrong, I redid the command, etc, same thing.

So, what is the best way to spot where things don’t intersect or what mistakes are you really looking for? Why did rhino choose to work for some of my objects, not others, and then not even leaving a way to complete the last edge.

I created the objects by splitting the other curve that’s hidden, joining, etc…Nothing complicated.
barbieleftherpantiesinmy G.I.Joe Jeep again.3dm (2.4 MB)
barbieleftherpantiesinmy G.I.Joe Jeep again.3dm (2.4 MB)

You can use the Intersect command to check if objects intersect.

In your model you don’t get a complete intersection curve. As far as I can tell, this is because filletEdge does not produce an accurate fillet. Use FilletSrf command (with extend option) to make the fillet and you get a complete intersection. See file:
Filetsrfx.3dm (104.4 KB)

Also you can save a little time by using Trim command instead of Split. Select both objects , run Trim, and then pick the pieces you want to delete. After Trim then run Join.

Thanks a lot Jim, I appreciate your time. The intersect command or Boolean intersect was exactly what I was looking for, since it will show you where you think the object is intersecting and if it’s not, then that is the problem in the command. A mirroring error, etc.

Also thanks for suggesting the time saving trim.
Usually on simple stuff I trim, but on more complex stuff lately I’ve been liking splitting things. Reason being it shows you what you trimmed or are going to trim, you can stick some bulk ugly mess on a layer if needed, and if you click on the wrong stuff and make an error, youre gonna catch it right away. With trim, stuff just disappears and there’s no way to check your work and the original are gone. So if you do make a mistake in selection, realize it, do the command again the cycle could just continue. Where as with split you might only make the wrong selection once, go back and figure out the best selection method. There both good, and trim is a lot cleaner in workflow, but an error early on, can turn really aggrevating later on.

Also, thanks for the heads up on the fillet edge command. Really, for the most part I’m trying not to do extrusions at all, and build better shapes using sweeps, and building surfaces with crossection wireframe type stuff. I know those types of surface building methods are more stable, you can do history, and generally much more complex shapes.

So, does anyone know why fillet edge is less accurate than fillet sfc? What is the command computing in fillet edge vs. sfc?

Also, as you’ll see here, the object that was originally in question with the most problems, still has the side edges of the priginal shape in the corner, with some really funky looking triangles. Whats the deal with this? Any Ideas? Yes I can trim it, but even after trimming, it takes some of the inner edge off. So, This isn’t making any sense. I started with a completely closed curve, with the side edges split from the main squiggle curve in the file. Then joined and extruded.Do you think one edge was a little longer by a hair when I was using end snaps or something?

<img src=“” width=“380” barbieleftherpantiesinmy G.I.Joe Jeep again2.3dm (2.2 MB) height=“500”>

I don’t know what “better shapes” means, but extrude is very useful surface creation tool.

Are you aware that your long curvy looking object is a polyline? It is not a smooth curve and therefore you’re not going to get smooth surfaces made from it.

Nope Jim, I am unaware of a polyline not being a smooth curve and therefore not giving smooth curves.

Do you have any leads on where to research this more? I have the inside rhino 5 book, rhino 5 user’s guide, and rob’s dvd. I am just beginning to learn continuity, knots, degrees of curves, etc…

Can the smooth command turn a polyline into a smooth curve? I’ve used the command a few times, but dont know much about it.

Also, can the curve being a polyline effect that surface fillet in that way?

I am new to rhino, and any leads are appreciated since you kinda gotta learn as you go and with so many passions/interests/skills my studying patterns are somewhat spuratic from day to month.

You can use the command


making sure that the degree is set to 3 - 5 and CurveType = Interpolated (assuming you want the curve to pass through the polyline vertices. Knots=Uniform will be best if the polyline has relatively even spacing between vertices, otheerwise SqrtChord may give a better result.

Black= Polyline, Red = CurveThroughPolyline


Did you make this curve yourself or was it imported from somewhere? As the name says, a polyline is just a bunch of straight line segments joined together. If you need smooth curves, you should use the curve command.

Thanks a lot, if I ever make the mistake of making polylines, I should be able to get a decent trace. It’s as simple as it gets. Just tracing some sketches with polyline vs control point curves, dur! Whew, I gotta lot to learn! I feel stupid for asking the question in the first place, I guess I don’t see curvish polylines in 100x, even as asking. Now I will associate polyline with facets, and not make the mistake, thank you. Every one of my projects is stalled because of stuff I don’t know, someday I’ll casting and reelin it in, patience patience, patience.