Re: [gl4java-usergroup] Re: accumulation buffer

[Thorsten R. <tho...@iv...>]

Hi *,

> >is it right using the accumulation buffer is really _slow_ ?
>
> arrr indeed. but then I set up my GeForce2Ultra to OpenGL and it flys.

grrrrrr ... ;-)

> >I'm trying to use the accum buffer because I need to set an alpha valu=
e to
> > a fixed display list with glColor's in it. With the accum buffer I sh=
ould
> > be able to add an already rendered display list with any alpha by glA=
ccum
> > (GL_ADD, alpha), right ?
>
> that=B9s the one. u could also do the hack it to make things faster. ma=
ke a
> plain object and put it in front of your camera. make the plain object =
30%
> transparent. don=B9t clear the back buffer. and u will have the 30%
> transparent shape do the clearing for u.
>
> simple uh :)

work's well... thanx!

> >Is there a way to set the color (r,g,b) without setting the alpha too =
?
>
> theres: gl.glColor3f(r, g, b); and gl.glColor4f(r, g, b, a); all in the=
m
> there docs :).

But gl.glColor3f (r,g,b) sets the alpha to 1f. I need the alpha value=20
unchanged...

ciao, Thorsten