 | | | Bump and no bump on same surface in one pass? | Bump and no bump on same surface in one pass? 2005-06-24 - By Morten Bartholdy
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Great info Alan - I'm not sure I've ever seen this in the docs on bump, but
then again, it is a while ago I read up on that :)
Thanks!
Best regards
Morten Bartholdy
3D & VFX Artist
-- -- Original Message -- --
From: "Alan Jones" <skyphyr@(protected)>
To: <XSI@(protected)>
Sent: Wednesday, June 22, 2005 11:04 AM
Subject: Re: Bump and no bump on same surface in one pass?
> Hi Morten,
>
> Sorry to chime in so late - computer problems lately. I showed a
> technique to achieve this at the last usergroup.
>
> Use the mixer as suggested and put your shader though a bumpmap (not
> bumpmap generator) node before it goes into the mixer. Then put your
> bumpmap generator into the bumpmap node. Anything plugged into the
> bumpmap node (directly or indirectly) will get the bumpmap from the
> bumpmap generator attached to it. The rest of the scene won't.
>
> You can do this as many times as you like in the one tree. So you
> could have one bump for diffuse, one for specular, one for reflection,
> one for .. you get the idea. Also using a ray type switch node you
> could make the bump not appear in reflections, or not appear in final
> gathering (really good for speeding up FG calculations) etc.
>
> Cheers,
>
> Alan.
>
> On 6/21/05, kim aldis <kim@(protected)> wrote:
> >
> > that little yellow bump, that's the giveaway. ;-)
> >
> >
> >
> >
> > __ ____ ____ ____ ____ ____ ____
> > From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On
Behalf Of
> > Morten Bartholdy
> > Sent: 21 June 2005 15:03
> >
> > To: XSI@(protected)
> > Subject: Re: Bump and no bump on same surface in one pass?
> >
> >
> >
> > Yes, I keep forgetting MR can't guess I want a color to vector
conversion
> > when plugging a texture in to the bump input ;)
> >
> > MB
> >
> >
> > -- -- Original Message -- --
> > From: kim aldis
> > To: XSI@(protected)
> > Sent: Tuesday, June 21, 2005 8:57 AM
> > Subject: RE: Bump and no bump on same surface in one pass?
> >
> >
> > there's not much point in plugging rgb into a bump vector input. You'll
need
> > to use the bump generator to convert it sensibly into a vector.
> >
> >
> > __ ____ ____ ____ ____ ____ ____
> > From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On
Behalf Of
> > Morten Bartholdy
> > Sent: 21 June 2005 00:25
> > To: XSI@(protected)
> > Subject: Re: Bump and no bump on same surface in one pass?
> >
> >
> >
> > I was using a mixer node too - I just think of color 1 as a layer on top
of
> > the base color. Actually, I can't reproduce that one. However if I plug
an
> > image or procedural texture directly into the bump channel of a Phong
> > shader, the normals look like they take a hike - the specular is wrong.
It
> > will only render a proper specular when I plug the texture node into
> > ambient/diffuse channels, which is sort of limiting.
> >
> > I hope they don't forget revamping bumpmaps for V5.0.
> >
> >
> > - Morten
> >
> >
> >
> > -- -- Original Message -- --
> > From: kim aldis
> > To: XSI@(protected)
> > Sent: Monday, June 20, 2005 6:35 PM
> > Subject: RE: Bump and no bump on same surface in one pass?
> >
> >
> > When I tried it I wasn't using layers, I just used the mix node.
> > . I put one Phong into each of the mix2nodes inputs. What was
interesting
> > was that the reflection remained flat where the illumination of the
surface
> > was bumped. So I took out the mixer and just plugged a Phong into the
> > surface with a bump image in the Phong's bump. Again, the reflection
didn't
> > bump but the illumination did. As far as I can tell right now, if you
bump a
> > phong then it's reflection won't bump. Surely this can't be right?
> >
> >
> >
> >
> > __ ____ ____ ____ ____ ____ ____
> > From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On
Behalf Of
> > Morten Bartholdy
> > Sent: 20 June 2005 17:19
> > To: XSI@(protected)
> > Subject: Re: Bump and no bump on same surface in one pass?
> >
> >
> >
> > Edit:
> >
> > Kim you were right - only the order of layering is important! I started
with
> > the sublayer with bump as base color and added a reflective coating as
color
> > 1 - that makes the reflective coating bumpy too. If I swap the two and
add
> > the bumpy Phong to a reflective surface, the reflection is unaltered by
the
> > bump, which is what I want. A bit backwards though, but it works :)
> >
> > - Morten
> >
> >
> > -- -- Original Message -- --
> > From: kim aldis
> > To: XSI@(protected)
> > Sent: Monday, June 20, 2005 4:37 PM
> > Subject: RE: Bump and no bump on same surface in one pass?
> >
> >
> > 2 phongs into a mix2colours node -> surface?
> >
> >
> > __ ____ ____ ____ ____ ____ ____
> > From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On
Behalf Of
> > Chris Marshall
> > Sent: 20 June 2005 15:41
> > To: XSI@(protected)
> > Subject: Re: Bump and no bump on same surface in one pass?
> >
> >
> > There's a shader called XSI-clear-coat on XSI base. Sounds like it might
do
> > the job for you.
> >
> >
> > Morten Bartholdy wrote:
> >
> > Hi List,
> >
> >
> > I am shading an object which has a bumpy glossy reflective surface and a
> > smooth layer of transparent laquer covering it, effectively rendering
the
> > surface smooth and reflective.
> >
> > I can't seem to create this combination in one pass on the same surface,
so
> > I wonder if anyone can offer a trick or workaround to make it work?
> >
> > TIA!
> >
> >
> > Best regards
> >
> > Morten Bartholdy
> > 3D & VFX Artist
> > cell +45 2169 54676
> >
> > --- Unsubscribe? Mail Majordomo@(protected) with the following text in
> > body: unsubscribe xsi
>
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