I have been using Rhino going on 15 years and I have never had an issue with building surfaces using the sweep two rails command. I have always been able to build using two rails that have complex curvature. I use blend curves often when trying to get complex radii that can’t always be built well with the fillet command.
I have just started using V6 and I am really hating it. For some reason, it absolutely not hold ANY tolerances with blend curve and sweep two rails command. There are also many times, as I am designing and reworking surfaces that I have to rebuild a surface and then retrim. When I try to rebuild a surface now in V6, it will not even remain close to the original shape no matter what I do. On the first project I have worked on, I have had to go back and redo more work than I ever have before, just because of this issue. One more thing is that when I blend curves, the curves will not always go to the ends of both curves being blended. They will actually blend but move up or down the curves slightly to the point where they don’t even want to join.
All this being said, is there a setting that I am somehow missing either because there are new tools to set tolerances or I am just forgetting something settings that have always been there but may have different defaults than previous versions.
Any input would be appreciated since this is costing me a great deal of time and a lot of frustration trying to get projects done in a timely manner and with good surfaces.