Bad surface | bad mesh

Hi there.
I have a polysurface here, that does not give a good mesh, no matter what settings. As one can see, even the isocurve in front seems to be cut off half way, but exploding and checking gives 98 good surfaces, and the whole reads as a good poly with what. It did worse in SR10, than in SR11, but that does not really help enough.
Rebuilding the thing does not help either, as the upper top front of the curved srf isn’t recognized as closed at all.
BadMesh.zip (100.2 KB)

Hi Stefan,

The cornering surfaces have edges that are way off the surface.
The left surface I ‘corrected’ with the command RebuildEdges, you see that the surface is shaped like the mesh you found incorrect.

You will need to model a new surface to get correct shading and a ‘better’ model.

How did you get this geometry in Rhino? Dis you build it is Rhino or was it imported?
In either case it is good to have more information (how did you build it or what was the original file)

-Willem

Hi Willem! I would not have posted this without mentioning it not having been done in Rhino.
All was done in Rhino, straightforward, and as far as I remember the thing looked good, until I 1D Scaled it vertical. Unfortunately I hadn’t backupped the srfs before doing so, and noticed only later the fault. That I have to rebuild it isn’t a nice thing, or is it. Actually, stuff like that did not happen in Rhino3 or earlier, I was just astonished. Of course we didn’t have a fillet edge with variable radii then either…

Funny… The edges of said surface that shrinks after the command rebuildedge to what the rendering shows, can be duplicated to the intended original surface. So I can loft, srf edge or whatever to hearts delight to rebuild the old surface.