I thought about this, however if any part of the model happens to be the
same color as the background, those areas will be make transparent too. Is
there no way to set the background to be transparent?
Cheers,
Tater
Anti-Aliasing aside, you could take the image inside Java and process
it. Essentially take every pixel that is a specific color (your
background color) and make those pixels transparent. (I even have some
code lost somewhere that does that)
- John Wright
Starfire Research
"Yazel, David J." wrote:
>
> Ah, then in effect you are drawing an image onto your canvas, even though
> that image is a the result of taking a snapshot of a 3d object. Next
> question... are you drawing your image to a AWT canvas, using a graphics
> context, or are you puttting your image into a Java3d scene? Eaither way,
> you will need to create an alpha channel in your image. There is no
> "transparent" image really. When you rendered to the offscreen buffer,
you
> effectively made an image, with every pixel filled in. You now need a
mask
> to be able to draw this without a background. As far as I know, and I
could
> be wrong, you cannot render to an offscreen buffer and have it set the
alpha
> channel automatically, although that would be nice. And you can't really
> pick a background color for your mask because the scene will be anti
aliased
> against the background color. Perhaps there is a trick someone else knows
> about.
>
> > ----------
> > From: Tater Read[SMTP:[EMAIL PROTECTED]]
> > Reply To: Discussion list for Java 3D API
> > Sent: Tuesday, September 05, 2000 12:30 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: [JAVA3D] Making background Transparent
> >
> > I'm using a color background. The 3D objects themselves are not being
> > occluded, it's the underlying vector graphics that are being occluded.
> > That
> > is, I'm rendering the 3D scene to an off-screen buffer, copying the
image,
> > then drawing it to a graphics context. So ideally, the background color
> > should be transparent.
> >
> > Cheers,
> >
> > Tater
> >
> >
> >
> > The background should not be occluding your objects. Are you using
> > background geometry, image or color?
> >
> > >
> > > Hi Dave,
> > >
> > > I suppose at some point I would like to add transparency to the 3D
> > objects
> > > in the scene but for now I am just adding opaque 3D objects with
images
> > > and/or vector graphics in the background. By the way, I noticed that
> > the
> > > ImageComponent supports an RGBA format, how do you set the Background
to
> > > be
> > > transparent? From the constructor it looks like it only takes RGB
> > values.
> > >
> > > Cheers,
> > >
> > > Tater
> > >
> > >
> > >
> > >
> > > I am not sure what you mean. If you mean can you draw a transparent
> > > image,
> > > then yes you can use alpha blending to great effect. You can set the
> > > transparency attributes on the polygon to totally transparent then
> > texture
> > > it with BLEND and with a RGBA loaded image (PNG works very well).
> > >
> > > Dave Yazel
> > >
> > >
> > > > Hello,
> > > >
> > > > I'm creating a simple 3D scene that I want to draw onto a canvas
with
> > > > other
> > > > graphics objects. Unfortunately, the background ends up being a
black
> > > > rectangle on top of the graphics. Is there a way of setting the
> > > > background
> > > > to be transparent?
> > > >
> > > > Cheers,
> > > >
> > > > Tater
> > > >
> > > >
> > > > Tater Read
> > > > Research & Development
> > > > Improv Technologies
> > > > 535 Eigth Avenue
> > > > New York, NY 10018
> > > > (212) 725-4590
> > > >
> > > >
> > >
> >
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