Just a little comment here. Has anybody tried working with the images and
making sure that they are transparent, or do you just assume it because you
set them up as transparent in some editor? Here is where I'm going with
this:
There are several web-pages that I designed. In many of them I needed an
image with transparent areas. What I did is I used Jasc Paintshop Pro 6.0,
set the background color as Transparent, deleted the areas I wanted to be
transparent, and saved that as a gif. While in Paintshop Pro, the
transparency worked just fine. Once I put the image on the web, all
transparent areas simply became white! In the same manner, it could have
become black, or whichever other color was the default for that application
(which I guess is black for J3D)...
I experimented with that and found out that if I take my gif, open it with
Jasc Animation Shop 2.0 and do the same for a single-framed
animation(namely set the background color to transparent and delete the
areas), the transparency is displayed correctly. I do not know if that's a
problem with photoshop as well. It's likely that it is just a bug in
Paintshop Pro; however, you don't lose anything by trying. If you don't
have the appropriate tools, I would be happy to do it for you, as long as
you have a way to point to me the areas you need to be transparent. I only
hope that J3D doesn't have any problems with such a gif, since it's
supposedly an animation. But having only one frame, I think you may get
away with it.
There is no need to complain to the Java guys before we try all
possibilities, right?:-)
Paraskevas
--- Tom Nelson <[EMAIL PROTECTED]> wrote:
> My best solution is to use gif87a images with a white
> background (black letters on white background) instead of gif89a
> images (black letters on a transparent background), and to use the
> 'modulate'
> mode.
> I change the color of the object that the gif is texured with (from dark
> to
> light)
> to get the effect of 'back-lighting up' that letter of the alphabet. The
> objects are the
> lighted letters of the alphabet on a model of the Enigma Cipher Machine,
> you press a key and a 'light' lights up under a letter behind the
> keyboard.
>
> With all other settings the same, the transparent gif makes the object
> 'disappear',
> just as J. Lee Dixon indicates below that it should (it did not disappear
> using
> java3d1.2)
> If I use a black and white gif, it works properly with java3d1.2.1b1 and
> java3d1.2
>
> Using the DECAL, BLEND, or REPLACE mode did not produce acceptable
> results,
> although DECAL seems like it should.
>
> Sorry for the bandwidth, but I wanted to have _a_ solution go into the
> archives
>
> in case others have a similar problem.
>
> Thanks for the help!
> Tom Nelson
>
> "J. Lee Dixon" wrote:
>
> >
> >
> > Well, from reading some documentation about how the color (C) and the
> > alpha (A) of a colored/textured polygon are computed:
> >
> > (where f=face(polygon) and t=texture)
> >
> > Modulate Mode:
> > C = Cf*Ct
> > A = Af*At
> >
> > In modulate mode, the alpha of the texture is *multiplied* by the alpha
> > of the polygon. In other words, if you can see through the texture,
> the
> > poly will be invisible as well.
> >
> > Decal Mode:
> > C = Cf*(1-At) + Ct*At
> > A = Af
> >
> > In decal mode, the texture will blend with the poly color, but the
> alpha
> > will only be taken from the face. I think this may be the mode you
> > want...
> >
> > (got this from the OpenGL red book...)
> >
> > -Lee
> >
>
>
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