Hi Everyone.
Pretty new to Rhino. Just starting to get the hang of it.
I’m trying to create kind of an organic curvy surface but it does come to a hard point in a corner.
See attached video.
I was thinking I could create a series of curved and then use the curve network function. But I’m not getting it to work AND I’m thinking there might be a better approach. Does anyone have any advice?
Thanks!!!
3D file included below as well.
SurfaceTest.3dm (252.6 KB)
Its not hard to create create surfaces that conform to those curves
surfacex.3dm (233.0 KB)
Is that what you want or is there more to what you want from those curves?
The networkSrf is usually best when it has a well defined four-sided boundary. Your shape doesn’t.
You can try using patchSrf on this, but depending on what is around this part you may not be able to join it with its neighbors.
In your shoes I would rethink those inner guide curves. Does that sharp edge mean you want it to have a crease there ?
Both of your solutions look better than mine.
Here is what I’ve been trying to do.
Jim. How did you get your surfaces to blend so smoothly into each other. When I try to get some undulation in my surfaces… See attached video.
ThomasAn… (thanks again)
No crease… When you say rethinking my inner guide curves… what do you mean by that? Should I make them run more vertical? Also maybe the attached video will help explain.
Thanks to you both.
When you get stuck having to blend a corner to something smooth, it’s time to take a step back and re-evaluate the process.
In your case, you are trying to create too many patches and make quilt. The general practice is to use as few surfaces as possible. So, you don’t even need this section at all.
… and you don’t need to force define this top curve either. It will happen naturally by the intersection later.
The way it’d go about is
to use splitEdge on this arch to split it in three segments at the points I indicate:
Use BlendSrf on the side pieces (with tangency only at the neck, and maintain height option)
Use NetworkSrf on the three edges and the curve
Trim it with a top srf
Untitled.3dm (133.0 KB)
Didn’t do anything special. I just used networkSrf twice and made two surfaces…
I used the curve in the middle as an edge curve on both surfaces.
NetworkSrf does not work well for making a surface with a crease and anyway a surface with a crease is probably not something you should try to make. Its just inviting trouble later.
If you want a single surface you could merge the two surfaces (with option smooth=no), but there are few situations where doing that will work to your advantage and lots of cases where it will cause you trouble.
This is a situation where I would use Rhino’s History.
First make the surface with History on then do the Trim (or Intersect ) with History on.
After that you can edit the input curves for the surface and watch how it affects the shape of the result of the Trim. If you have a curve (such as the OP provided) that describes the shape of the intersection of the surface with the flat you can edit the surface to get it to conform to that shape.
Excellent. Both ideas working for me. Thanks to you both.
-Drew
