 | | | Re: Transparent Label Problem - Solved | Re: Transparent Label Problem - Solved
2004-06-30 - By ccoles_avengers
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Hi Doug,
--- In Carrara@(protected), "onelistdrs " <ds-mail@(protected) > wrote:
> --- In Carrara@(protected), "ccoles_avengers " <ccoles_shado@(protected) >
> wrote:
> > Hi Craig, >
> > Don 't know if you are working off of my Decal Shader tutorial from
> > this month 's edition of 3dXtract magazine or not, but if so, there
> is > a way to do decals on glass. If you follow the
> tutorial......snip > > Picture of Glass with Opaque Decal - >
> <http://groups.yahoo.com/group/Carrara/files/CC_CS3_Files/glass_w_deca
> l.jpg >
> > Claudia > "Selocic " > ....snip
>
> Claudia,
>
> I 've been unable to see the .jpg file on Yahoo (it refuses to open or
> download...other of your .jpgs are fine)...but think I have the idea
> OK and I did follow the 3dXtract tut OK.
Let me know if this works better:
<http://groups.yahoo.com/group/Carrara/files/CC_CS3_Files/glassdecal.jpg >
>
> Is it fair to assume, using the correct/matching "decal " and "matte "
> files...that a partly transparent "decal " on partly
> transparent "glass " will work OK? (i.e. see thru both...and thru a
> partly transparent "liquid " inside the bottle)
If I am understanding your question properly, you can use a mixer
operator in the Transparency channel, with Source 1 being your
inverted matte and source 2 being the color white at 100%, if you use
a value blender, you should be able to achieve the amount of
tranparency you need:
<http://groups.yahoo.com/group/Carrara/files/CC_CS3_Files/glassdecaltrans1.jpg >
>
> I often see labels that have "clear " portions on a semi-transparent
> plastic bottle....like a plastic bottle of dish soap.
I don 't have time to whip one up right now, but I believe that would
be resolved by the creating your matte in a 2D paint program with
certain greyscale values for the portions of your image that you want
semi-transparent, opaque, or full transparent.
>
> I 'm also remembering true "decals " placed on plastic airplane models
> where the "transparent " part of the decal can be seen because it is
> physically there....and duplicating that effect in Carrara is
> possible? ...just follow your tut? or are there any other "gotcha 's "?
Doug, can I ask a personal question here...were you an all-star
baseball pitcher back in High School, because you 're sure throwing me
some curve balls today! [aw...just teasing ;)] Actually, I think this
is possible as well.
You need to manipulate the Opacity Mask in such a way to achieve this.
Use a mixer operator with the matte as a blender. Then in Source
1, use a value of 20% while in Source 2, use a Value of 100% and you
should see your square outline as semi-transparent while your decal
remains opaque:
Plastic ball model with decal and semi-transparent edges -
<http://groups.yahoo.com/group/Carrara/files/CC_CS3_Files/balldecaltrans1.jpg >
[ hehe - that was my curve ball back to you. ;) ]
If you want one of those "fancy " decals with plastic see-through edges
that follow the contours of the decal itself (that is to say, not just
a square one), then you have to create your matte in a 2D paint
program in such a way with greyscale values where absolute black will
be the background while the edges of the decal will be some
shade/value of grey.
Phew! Well, hope that helps. Stay tuned for some more interesting,
out-of-the-box effects with decal shaders in the upcoming edition of
3dXtract. I 'm putting the final touches on it even as I type.
Cheers.
Claudia
"Selocic "
- 3D: when 'Flat ' just isn 't good enough! -
>
> Doug.S
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