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Hey Dave -- I'm not doing a normal map :) I meant that the results of running the image node directly into the bump looked like the results of using my bump like a normal map, i.e. the value at the lookup point is used as the normal rather than perturbing the normal with the map's gradient. Sorry for being unclear.. I'll try fussing around with it again, though. I think I must be doing something wrong....
B
On 9/6/06, dbarosin(at)optonline.net <dbarosin(at)optonline.net
> wrote:Ok so if you want to do normal mapping you'll need
A) a normal map
B) you have to remap the image to (-1, 1) so run the image thru 2 color basics (math nodes)
The first color basic subtracts 0.5
the second multiplies by 2 (though sometimes I've found better results going higher than 2)
----- Original Message -----
From: B Miller <bmillerxsilist(at)gmail.com>
Date: Wednesday, September 6, 2006 11:37 am
Subject: Re: map_lookup_color + bumpmap_generator
> maybe I'm doing something funny, but I'm not getting proper normal
> perturbation when I do that.. More like doing a normal map. I've
> got the
> bump mapping enabled on the image node.
>
> B
>
>
> On 9/6/06, dbarosin(at)optonline.net <dbarosin(at)optonline.net> wrote:
> >
> > Yeah I was skipping the bumpmap_generator and going directly in
> to bump
> > after the image node. Once it's in the image node you'll have
> similar> setting for bump.
> >
> > Is there something specific about the bump_generator that you need?
> >
> >
> >
> > ----- Original Message -----
> > From: B Miller <bmillerxsilist(at)gmail.com>
> > Date: Wednesday, September 6, 2006 10:24 am
> > Subject: Re: map_lookup_color + bumpmap_generator
> >
> > > Hmmm... Nope, that doesn't seem to work.....
> > >
> > > B
> > >
> > >
> > > On 9/6/06,
dbarosin(at)optonline.net <dbarosin(at)optonline.net> wrote:
> > > >
> > > > Hey B. Maybe try connecting the map_lookup_color to an
> image node
> > > > first. From there you'll get a projection.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > *----- Original Message -----*
> > > >
> > > > *From*: B Miller <bmillerxsilist(at)gmail.com>
> > > >
> > > > *Date*: Tuesday, September 5, 2006 3:25 pm
> > > >
> > > > *Subject*: map_lookup_color + bumpmap_generator
> > > >
> > > > > Hi all,
> > > > >
> > > > > Does anybody know the proper way to set up a bumpmap using
> > > > > map_lookup_colorwith a bumpmap_generator node? I'm getting
> some> > >
> > > > > artifacting from zbump and
> > > > > I'd like to try to set the shader up using the xsi nodes. I've
> > > > > looked at
> > > > > Kim's bumpmap tutorial, and it makes sense, but my setup
> lacks the
> > > > > coordinput and I'm not sure how to introduce texture
> coordinates.> > >
> > > > >
> > > > > In my setup, I've got surfaces with texture map properties (so
> > > > > that I can
> > > > > use the same shader with object specific maps). I use a
> > > > > map_lookup_color to
> > > > > get the bump map, then I was piping the output into the zbump
> > > > > input, then
> > > > > into the bump for the material. This works fine, except for
> the> > above> > mentioned artifacting (heavy blinking and white
> pixels).> > If I just
> > > > > substitute a bumpmap_generator for the zbump, I get no bump
> on the
> > > > > renderedsurface. Presumably I need to introduce texture
> > > >
> > > > > coordinates? I'm at a
> > > > > loss... Does anybody know how to do this?
> > > > >
> > > > > thanks,
> > > > >
> > > > > Brett
> > > > >
> > > >
> > >
> > ---
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> >
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