i had this problem in conjunction with zbump and
hdri reflections, thinking back it was probably the hdr NOT zbump
it's just that at the time, zbump was the unknown
vairable.....
someone explained it was when pixel/ray values are
returned out of a particular range (alan?) it becomes NAN (not a
number)
and renders as black....
this would indicate a mental ray issue, i saw the
same problem on a maya list
a
Adrian Wyer
Fluid Pictures
33 Glasshouse Street
London
W1B
5DG
----- Original Message -----
Sent: Wednesday, August 09, 2006 2:42
PM
Subject: Re: flickering with zbump
What's with those damn black artifacts? Can anyone at
Soft give a clear explanation of the problem and maybe put as at ease and tell
us it will be fixed in the next release. It happens way too often and
there doesn't seem to be a clear repro for it. I know I've submitted
some nasty scene files to illustrate it. The problem is that its
somewhat random but seems to happen often when using OpenEXR, HDRI or shaders
like zbump or dark tree. I had it pop up again on a job where I was
using an OpenEXR image as an environment for reflections. I got lots of
the little buggers so I converted it to HDRI and it worked fine. It just
happens a bit too often I think. If its an MR thing, we need to bash
their heads in a bit to address the problem.
Kris
kim aldis
wrote:
Didn't the new version fix that?
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On
Behalf Of adrian
Sent: 09 August 2006 12:20
To: XSI(at)Softimage.COM
Subject: Re: flickering with zbump
we had issues with this, but it manifested itself as 2x2 or 4x4 pixel
black squares.....
resolved by lowering the bump factor, or some convoluted rendertree
chicanery to stop zbump returning NAN values
not much help i know
a
Adrian Wyer
Fluid Pictures
33 Glasshouse Street
London
W1B 5DG
----- Original Message -----
From: "Chris Marshall" <chris(at)eclipsecreative.co.uk>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, August 09, 2006 12:22 PM
Subject: flickering with zbump
Hi All,
Does anyone get flickering problems when using zbump?
I've seen it on two jobs now, and it's so bad we've had to go back to
regular bumpmapping, which isn't ideal.
It happens when you have an object breaking through the surface of
the one
using zbump. The flickering occurs around the area where the one
object
penetrates the other.
Anyone seen this or can offer some advice on fixing it?
Thanks
Chris
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