Displacement presampling | Whoa, whats this?

[Bonedaddy]

Haven't toyed with the ocean shader, but it sounds to me like it's doing some extra calculating of the bounding box of the plane based on some sort of (possibly faked) displacement from the ocean shader, set off because the camera is so close... could be wrong.

[Undseth]

Yeah, I wonder how the displacement is done with that ocean shader.

I hope someone out there would want to write something here. Perhaps providing a tip of some sort. That would be pretty nice.

[Finkster]

If you are still seeking a solution to this problem, I believe I have found it. You can eliminate the displacement presampling by reducing the maximum displacement value under the geometry approximation settings i.e. set this value no higher than it needs to be according to the displacement amplitude of your shader.
I'm coming from XSI, but I'm sure you can translate this into Maya speak.

[Undseth]

Thank you. This looks very promising.

[Jackdeth]

Most likely it is subdividing the object by screen space. The closer you are, the more polys it makes. Just adjust your displacement approxamations.

[Chadrik]

the maximum displacement settings that finkster is referring to are not directly available in maya. you must add dynamic attributes in order to set it. there is a ui script at highend3d called mrDynamicAttrs that will help you set this up. you can find it here (http://http://www.highend3d.com/maya/mel/?section=rendering&sort=dt_modified+desc#3306)

hope that helps

chadrik

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