Hi Micha,

   I have run into this problem on occasion and what I do is
for the plane problem I extend it slightly into the plane. This
helps get rid of multiple reflections between the bottom of
the cylinder and the surface of the plane.
   For water in a glass I always scale the water a little larger.
If you make it smaller you have an unnatural reflection situation
between the glass surface and the water surface. Just keep your
over scaling to a minimum amount - something like .0001 is
enough. I believe this is the recommended method somewhere
in the docs but I'm unsure which section. Probably under cgs
operations.

  Other people may handle these situations differently but
they have worked well for me.

Ken Tyler

Micha Riser wrote:

> I tried to make a glass cylinder standing on a plane.
> If the cylinder's bottom is exactly on the plane there is the problem of
> coincident surfaces. But what is the correct solution: to set the something
> above plane or somthing in plane?
>
> And how to solve it when water an glass (different iors) objects touches each
> other?

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