This may be well known but I didn't see anything on the forum or web in general about this so for the next person who stumbles across this, here's some information on how Real UV works. Eric okay'd posting the exchange.

Marc

Marc,
Real UV only does it's thing against UV based shaders so something
like
Cellular which runs off the local coordinates should see no effect. Now if
you were really interested in getting a version of litst's shader that
does
work with it, you could always do the render to plane, bring into your
favorite 2D program, and make a tileable texture trick. That is basically
what I did for the texture used in the build a stone wall with Anything
Grooves tutorial.

A multichannel shader won't work under Real UV, it's only a single
channel shader, but it's something I can look into.

Best regards,
Eric Winemiller
Digital Carvers Guild
3D Extensions for Carrara
http://digitalcarversguild.com

----- Original Message -----
From: "Marc Quattromani"
To: "Eric Winemiller"
Sent: Friday, May 30, 2003 12:57 AM
Subject: Real UV question

Hi, Eric,

I've been playing around with some of the Shader Ops shaders that I
haven't
used previously, including some of the older ones, like Real UV and had
a
few questions.

I'm trying to use one of litst's nice paved stone shaders and can't
seem
to
get Real UV to work with it.

First, I can get Real UV to work with a Checkers Pattern but when I try
it
using a cellular pattern, it doesn't seem to have any effect. If I do a
simple shader with real UV in the color channel and either checkers or
cellular underneath it, Real UV alters the checkers but doesn't seem to
alter the cellular pattern regardless of any of the parameters.

Second, is it possible to use Real UV in the root position of the shader
and
have a multichannel shader under it? This seems to work for me with a
simple
shader (like one with a checker pattern in the color channel) but when I
put
litst's multichannel mixer shader under here, I just get all gray (which
is
somewhat different from the first case where I get no 'real UV' effect
but
still get the original shader coming through. This happens even if I
change
the mixer to checkers; I still get the all gray.) The stone shader in
question isn't too complicated, just a multichannel mixer with a
cellular
pattern in the mixer shader.

I've tried Real UV in front of each channel rather than on top of the
multi-channel mixer. This doesn't result in all gray but doesn't seem to
have any effect either. However, with Real UV on each channel and a
checker
pattern in the mixer with Real UV on it as well, Real UV seems to work.

Are there some shaders that Real UV doesn't work with?

I can send a sample file if it helps.

Thanks,
Marc