Hi Jesus - I see this, I do not have a good explanation. When the object is blocked, it goes bad… Looks like a bug to me.
You can fix it inside BlockEdit by:
1.Explode the polysurface
2. RebuildEdges (defaults)
3. Join
4. Exit BlockEdit
Thanks for the reply. I tried differente options in Rhino6 and I found that if you rebuild an Arc or a Circle you don’t gonna have this issue. but this doesn’t work in Rhino5
@Punto_3D - The problem is that the block in your file has a transform that doesn’t work for block reference inserts in Rhino,
The bottom row of the transform is 0,0,0,0.1 and should always be 0,0,0,1
If you insert another instance of that block into the file the block edit that one, it will work right. If you insert it at scale 10, it will be the same size as the one in your file, but with a better transform.
Do you know how the file was made, especially, how the block insert was made?
The original file was created in Sketchup. Usually I use that kind of files to simulate that is a file of a 3d model scanned and try to obtain silhouettes and sections to create the 3D model in Rhino