[Sidefx-houdini-list] Refraction Artifacts

zhang xiao zhangxiao6776 at gmail.com
Fri Sep 7 17:18:48 EDT 2007

something i can thought of,
1.total refraction(check your refract index value),
2.displacement artifact, increase the eyesplit(in renderman)might help, but
don't know
what's the corresponding paramenters in mantra.

On 9/5/07, Robert Thomas <shinyaryart.sidefx at gmail.com> wrote:
> Hi everyone,
> I'm trying to make a refractive cloaking effect on a model I made.  I
> render
> out the animation of the ship to a sequence of pngs, import them into COPs
> for a quick blurring, and then use the COPs image to drive displacement of
> a
> grid that is positioned directly in front of the camera.  This grid has a
> shader that does nothing but refract.
> I'm satisfied with the effect for now, but I'm getting these weird
> artifacts
> from the refraction as you can see here (sorry about the poor quality; I'm
> still a student, so money for server space is hard to come by):
> http://video.google.com/videoplay?docid=-7367526999095079401&hl=en
> At frame 6 there is an artifact on the ship itself, and later on there are
> artifacts on the terrain.  Somehow the refractive shader is letting me see
> parts of the background.
> Can someone tell me what they are and how to get rid of them?
> Thanks!
> Robby
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