As I am playing with 5 degree ship hull surfaces, I noticed strange behavior of both Rhino 5 and 6.
I found out that advanced display settings of my 5-Degree surface isn’t used for display.
In the attached file, you can find the original Nurbs surface with advanced display quality settings showing poor in glossy display
ExtractRenderMesh shows a rough mesh with poor display quality that seems to be used for the actual display of the Nurbs surface
A Mesh extracted from the Nurbs object with the same settings as the advanced render mesh settings, does show smooth.
Hi Gerard - I see this… still digging…
It seems that if I actually shade the viewport and then ExtractrenderMesh, I get the right mesh - is that what you see? If I ExtractRenderMesh without ever shading a view, then I get the wrong mesh…
Thanks for reminding me about the flat shade functionality. That is useful to examine the render mesh.
This morning, I opened the newsgroup example file and the render mesh showed well. However, the original file still showed the rough mesh instead of the refined mesh, I set with the per object advanced mesh settings.
But after editing a control point position with a large step, it flipped to the smooth settings.
So there seems to be something not working perfectly, but at least I know how to solve it with the work around of moving a control point.