displacement

[morlo]

Hello,
I have a question:
when I move a camera over a geometry with a displacement shader I note that the displacement has some artefacts.
I have done a sand with a diplacement,but
the sand "vibrates",why?
How can I resolve this problem?
My setting in Displace Bound is 0.1.
Is there a jitter,antialiasing,bucket size or shading quality problem?
I have done some tests changing with jitter,antialiasing,bucket size or shading quality,but I have the same problems.
Can you help me?

Many thanks

Giuseppe

[gdc]

There are a couple of things to check.
First, are you sure your problems are from the displacement? I assume that you are using some type of noise in your shader for the sand?? Perhaps the noise is not alaising corretly. I would try a test without any displacement and see if it still "vibrates". If it does then the problem is in the shader OR the rendering qualty.
You can increase the Supper Sample to 4x4 or 5x5, but there should be any reason to go higher except in rare cases. I belive it max's out at 8x8. You can also up the shading quality on the object in the Render para page.
More than likely uping the Sampling to 4x4 and the shading quality to 2 or 3 should sovle the problem.
By the way what render are you using? There are many different tweeks for the different render outputs.

hope that helps

--g