Hi there, I’m pretty new to rhino and I’ve just started learning from online courses so sorry if the question seems trivial to you.
My strategy is also to get some 3dm files online, analyse them and try to replicate what the author is doing to have a better understanding of the process of creating polysurfaces.
I came across this file and while trying to replicate the surface I get a different result.
Basically in their file in the wireframe view I can only see the edges which turns into a solid in the shaded view.
You can see my try (left) and their try (right) next to each other in the pictures attached.
What am I missing? How can they get a surface which only shows edges in the wireframe view? Any replies would be really appreciated.
Thanks in advance.
The object on the left seems to be a mesh. A mesh consists of many small triangles or quads. You can see all edges.
On the right you see a polysurface. Surfaces are defined by curves.
Here’s some basic information on geometry types in Rhino:
Just for context: I created mine with sweep 1 rail and 3 closed curves
Which of the two objects did you create?
Did you run any other commands after Sweep1?
I’ve created the mesh, the one on the left. No other commands after sweep1. My question would be how do I create the same polysurface as the one on the right starting from here?
If the object on the left is a surface or polysurface, your closed curves must be polylines with a lot of control points.
You can get a clean result by rebuilding the curves with as few control points as possible.
This is what I get if I reduce the control points on both the rail and the closed curve. It’s cleaner but it still looks different from the original one on the right.
That one is literally only showing the rail and the closed curve.
You might also need to rebuild the rail.
Yeah I did rebuild the rail
Ok. For any additional guidance please upload your Rhino file.
there you go
Where did you get the example from?
Does it matter? 
If you want to understand why your object has isocurves and the example doesn’t, maybe…
It’s from a file I bought from cgtrader
The original surface is trimmed.
Impossible to say more about it without knowing in which program it was created.
It could have been created with matrix but not too sure