Hi Buzhug,

> I tried different methods, but not great in the render.

Could you post some of your results so I can see what you have tried and make some suggestions?

Did you see the sequence that I recommend in this post:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3137.5

That shows the steps that I would recommend for making this kind of shape, it involves drawing 4 curves, then doing 2 sweeps, some trimming and then a fillet to produce a rounded edge, there are screenshots in that post to help you follow along.

There's also an example model attached there named RoundedSlab.3dm

Do you have problems following those steps or is the final result not suitable for some reason? If you don't like that result can you please let me know what is not good about it and then I can try to explain how to make some adjustments to it.

One of the main things with this kind of a shape is to try and break it down into a couple of more simple broader surfaces and then build those with some more simple curves, then combine the results by filleting. That's instead of trying to build the whole thing all in just one single surfacing operation.

- Michael