I am having a problem in importing a 3D surface (not poly-surface) from Autocad to Rhino. The surface turns to a mesh and is only convertible to poly-surface after it has been imported from Autocad. How do I solve this? Attached are the files. Thanks.
Try3.3dm (626.1 KB)
Try3.dwg (1.5 MB)
Hello - in this case it is relatively easy to get what might be an acceptable surface from the mesh.
-
ExplodeBlock
the objects. - ExtractMeshPart the top ‘surfaces’ (four mesh parts) of each and hide the rest.
- Join the two parts on each half.
-
Patch
each mesh
-
Trim
the surfaces with a centerline -
DupBorder
the two meshes
-
ProjectToCPlane
the border curves. (actually, just trimming the initial patces with the border curves should work fine - probably no need for the project and Boolean steps.) -
CurveBoolean
to get the outer loop.
-
Trim
orSplit
the patch surfaces with this curve.
-
OffsetSrf
Solid=Yes, as needed
Note in all of this the outer trim will be with a polyline - to make a smooth trim, you’ll need to remake that outer curve with a clean Nurbs curve.
-Pascal
Pascal’s option here is the simpliest. But, I did want to point out another option is to use the Quadremesher and the SubD tools in the Rhino 7 WIP. This leads to a lot of ways to edit these forms.
You can find out more about the SubD here: Rhino 7 Feature: Subdivision Geometry
Here is how Meshes to SubD can be converted: https://www.youtube.com/watch?v=_rE8lsKdd6E&feature=youtu.be
And the here is a new draft of a tutorial on getting these shapes with SubD: https://wiki.mcneel.com/7/tutorials/subd/mouse#overview
Thank you for the reply!