Strange mesh artifacts

Hi guys, been using rhino for a bit but just joined the forum recently.

I’m creating a blend between two surfaces that has to match a 3rd trimmed edge. I wanted to create a quick iteration of a design so I thought I’d just matchsrf on all 3 sides and tick the refine box. As expected, it gave an egregious amount of control points but I didn’t mind because it was just for a draft.

So everything looks fine, edges all match, but there seems to be some strange artifacts when the program tries to create a mesh with high density of control points. Wondering why this happens?

Appreciate any help or feedback about how to better structure my questions :slight_smile:

best would be if you cut out that part of your lovely ear and hair scene which i would like to see in whole and just post that portion that troubles, its kind of impossible to tell from the image what exactly the issue is

rhino-mesh-help.3dm (1.0 MB)
Here you go. Thanks so much for helping out!

If possible, could you suggest a better way to create the fillet?
I’m creating a hair piece that fits into a neck, and I want to have it sit flush against the neck.
However if I create a profile for the fillet and trim the neck surface, it creates the trimmed edge that is difficult to match to. I’ve thought about maybe extending the fillet surface instead and then using the intersection to trim both. But maybe there’s a better way to do this.

regarding your edge:
your surface is folding back in on itself if you extend the surface you see that it flips over at the edge and goes backwards. something went wrong while matching obviously.

the same seems to have happened with the other side. you can also check the edge holding cmd + shift while hovering over the edge that will show you that the normals are showing into different directions

this is how it should look like, in that case after trimming it off

as a quick fix i would extract the isocurves from both sides and trim a bit back

then use BlendSrf

generally you might try to model more continous, you have many sections which could be done in one go much rather, then you dont run into such issues.

Ah that makes sense. I’ll check the edge normals next time :slight_smile:
Thanks a lot for your help!!