Open mesh extrude to closed mesh


I Have this large open mesh for my thesis which i would like into a surface so i can work on it in autocad.
i found the drape command which worked nice but loses a lot of detail from the mesh, con you help me?

Of course I don’t know what you intend to do with it in autocad - and also not sure if autocad cannot read the mesh model but apart from that…

It looks like a high resolution mesh but I suppose you could try the mesh to nurbs command. It is likely to choke your PC but any other way will lead to great loss of resolution.

Hi Arno - I cannot tell, between the subject and your comments, whether you actually need a surface a closed version of the mesh…?


You will never be able to get a “surface” that detailed that would work in AutoCAD, nor likely Rhino. That is why terrain models use meshes and not NURBS.

AutoCAD should be able to import the mesh via DXF (beware file size) but once it’s in, I don’t know what can be done with it. There are some AutoCAD extensions that will allow you to work with terrain meshes, but I guess the question is - why do you need it closed and what are you planning to do with it afterwards?

If you really need a surface then draping the model is the only way to go - try setting AutoSpacing=No and then setting a high point count in each direction before dragging the rectangle. Too high of course and you’ll crash your computer; and in any case it will be far less detailed than the mesh, with no sharp edges.



thank you for your information.

1- mainly i want to have it in autocad so when i take slices in autocad the environment is sliced to and i can take flatshot’s and other things i do to visualize. When autocad takes a flatshot of a mesh you can see evrey triangel while when he takes a flatshot of a surface you only see the outlines.

2- i want to get it closed so i can export to stl for 3D printing or to cnc the model in a piece of foam od wood

3- when i drape whit high u and v point count then he resets this to someting like my screen resolution ,and even when i use a macbook retina on native resolution it still loses a lot of detail


I’m not totally sure what you are saying in number 1 and thus why you can’t do that in Rhino, but at least nr 2 should be possible from within Rhino.

Sounds like Flatshot is the equivalent of Make2D in Rhino. True, in Rhino 5 you cannot Make2D with meshes.

You do need a closed mesh for 3D printing. It does not need to be closed for milling. But in both cases you can work from a mesh.

Well, as I said, you will not get a surface with the detail of a mesh. Getting a surface with retina resolution in terms of control points (2880 x 1800) is already more than I thought you could get without crashing Rhino.