It’s mainly where geometry is connected together kind of oddly. I"m a bit new to Rhino but slowly gaining traction. I’ve spent a lot of time researching, tangency, matching surfaces and etc. I feel like I’ve done a decent job creating 4sided surfaces to create this guitar. But when I go to fillet edges… it just get’s ugly.
Please see attached video below. Any help and advice is appreciated. I feel like the issue is somewhere in my foundational building of surfaces and joining them.
Thank you.
jens.pufahl
(Jens Pufahl - "It's always just about the vertices!"😉)
2
I haven’t seen the file jet.
But first of all you should figure out where the issue is.
Therefore you can fillet only parts of the edges until the fillet doesn’t work anymore.
Then you can work on the cause!
The issue is here at these edges highlighted in yellow. Neither one of these edges will fillet properly. But I still don’t understand what’s causing the issue. Re-uploading the model. I’ve revised the geometry to clean it up a bit. But I’m still stumped.
The usual patch layout approach in surface modelling, to avoid building three-sided surfaces, is to use four-sided surfaces, then intersect, then trim. In fact, the whole cut-in surface can be built by a single single span surface of degree 6 or 7 from four edges, or a two span surface of degree 5, then intersected and trimmed with the top and side surfaces of the guitar body.
Lagom- Can you explain this a little more? I think I almost understand your suggestion.. I’m curious how you’d build the initial single span surface. Thank you.
I briefly cobbled something together to give you an idea. When you view your run-around edge surfaces from the top, you see they are a bit off in places, not all vertical, or not all with crown, or not all with some kind of draft angle. Also, it is better to not piece small surfaces together, but to use larger surfaces instead, from degree 2 and degree 5 curves. Also, the run-around edge surfaces should be G1 or even G2 continuous. Then, as you can see, you can build chord-length fillets on all edges without any problem.
Lagom… Thanks for the model and advice. That technique makes sense and worked really well for me.
I have one remaining issue. With 1 fillet the top edge. Overall, these fillets are making more sense to me as well as understanding the various surfaces and how to get clean fillets. But I have 1 edge on the top that I cannot fillet and I’m stumped. Again any help would be great.
Thanks to everyone. Model attached if you need to see it.
It appears that a triangular region with a near-sighted covergence point is causing the FilletEdge failure. Try avoiding this “convergence point” to successfully FilletEdge, fyi,
Pls review the video demo I provided earlier. For you current case, I suggest cutting out this triangular region and then creating a four-side surface.
It’s also a good idea, for a simple patch layout, and as few surfaces as possible, to first create G2 (or at least G1) continuous curves of your guitar body in the top view, then do the same with the set of inner curves to trim as Gijs suggests.
