NURBS problem (2)

[z00lander]

I have made a NURBS cube and applied a round to some of the edges and corners. However at the corner, instead of the surface following the curve, it just goes straight across leaving a gap at the corner. This gap can only be seen in the persp view although it does render.
See http://www24.brinkster.com/considinesean/mayascreen.jpg for a screen shot of what i mean.
Please help

[hnf]

there is a step by step tut in the help files for the round tool to create such a cube. but there is a much better way to create this with a single surface instead of all the patches you get with round tool.

[z00lander]

Yeh I know, I followed that tutorial and that is the result I get, I dont know if I have a setting wrong or something.
What is the better way to do it?

[hnf]

here you can download an example

www2.fh-harz.de/~u13837/cube.mb

it's easy done. at first i create a circle and set the divs to 12. then i take the cv's and scale them out so i get a rectangle with rounded corners. then i duplicate this curve and do a loft between the two. now i go and insert 2 isoparms on one open side of the lofted surface (near the edge and both new isoparms near together). then i select the last hull (on the edge) and scale it down, but not to zero, just a step before it's closed. then i create a cluster on this hull and scale it just in one dir to 0. now do the last steps on the other side to. after all i insert one last isoparms on the new closed sides, just to get a nice result on both sides. that's it.

[z00lander]

Nah, I dont like that effect, it makes the top curved instead of flat.
I figured out that by turning the number of uv spans for the tesselation up it smoothed out the curve and closed the gap

[hnf]

you can get any shape you want with this mehtod on the top, even a absolute straight one. it's just on you. and the result is only one piece of geometry and no multi patched-trimmed surface which will get you into more trouble after modeling.

but if you don't like it, don't do it

[joojaa]

Well your intitial problem has to do with tesselation... the wievports do a rather low quality tesselation to ensure fastest possible playback... You can however put some custom tesselation on the viewport too.

If the same problem persists in the render view then just up your tesselation values and/turn edge smooth on. Also fiddling with AA helps quite much.

Also you can rebuld the surfaces to not include trims then just match the parametrisation now the tesselatin can be set to much lower quality and it defforms better.

[z00lander]

Eh? Sorry Ive only been doing Maya a couple of weeks. Please explain this rebuilding surfaces and parametrisation.
Thanks