[Sidefx-houdini-list] Refraction Artifacts

Peter Bowmar pbowmar at gmail.com
Fri Sep 7 17:23:46 EDT 2007


Yeah that looks like displacement bounds problems. Turn up the
Displacement Bounds parameter on your object, roughly equal to
whatever the Displacement amount is on the shader.

Cheers,

Peter B

On 07/09/2007, zhang xiao <zhangxiao6776 at gmail.com> wrote:
> 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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>
>
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