Re: An interpolation question...

• To: "Wilson, Andrew, J" <andrew.wilson@xxxxxxxxxxxx>
• Subject: Re: An interpolation question...
• From: Helen Yi <y.yi@xxxxxxxxxxxxx>
• Date: Thu, 06 Feb 2003 17:23:55 -0500

In Java 3D, it seems there is some limitation on how big the display can
be.
Reduce your data set to 250 samples x 800 samples (better less than
1000) for each slice.
Test again using DisplayImplJ3D("display1",
newTwoDDisplayRendererJ3D()); with setTextureEnable(false).

good luck



Bill Hibbard wrote:

> "Wilson, Andrew, J" wrote:
> >
> > Can I just check I am not missing something here?
> >
> > Right now I am displaying a data set that has 11 slices, each
> > of which is 250 samples x 2001 samples.
> >
> > With setTextureEnable(true) I can quite quickly flick through
> > the slices using the VisAd animation support. This is really
> > very nice and I (and my boss) were impressed with how quickly
> > this could be implemented.
> >
> > But the display is blocky and my users are used to nice
> > smooth displays. Sigh.
> >
> > If I create my display with DisplayImpJ2D then
> > setTextureEnable(false) eventually delivers a nice smoothed
> > image but is very, very slow.
>
> DisplayImplJ2D should be fast if you use a Linear2DSet without
> any CoordinateSystem, and with ScalarMaps to Cartesian spatial
> DisplayRealTypes (i.e., XAxis, etc). But slow if you use a
> Gridded2DSet, a CoordinateSystem, or ScalarMaps to non-Cartesian
> spatial DisplayRealTypes.
>
> > If I create my display with DisplayImplJ3D("display1", new
> > TwoDDisplayRendererJ3D());
> > then I just get a blank screen when I
> > setTextureEnable(false).
>
> If two programs are identical except for whether they
> pass true or false to setTextureEnable(), and the one
> with true shows an image and the one with false has a
> blank screen, then that's a bug. However, this has all
> been so thoroughly exercised that its hard to believe.
>
> > Can I get the speed of Texture mapped rendering with the
> > smoothness of interpolation?
>
> A DisplayImplJ3D with setTextureEnable(false) should be
> a lot faster than the same thing in a DisplayImplJ2D, but
> not as fast as with texture mapping.
>
> > Do I have to guesstimate how many screen pixels are on show
> > and resample myself?
>
> It is a recurring theme in visualization, that the
> best performance requires more complexity in
> applications. The approach you describe would
> probably help.
>
> But first re-examine your use of DisplayImplJ3D with
> setTextureEnable(false) that produces the blank display.
> It sounds like there's either a bug in VIsAD or a bug
> in your program.
>
> Good luck,
> Bill

• References:
  • RE: An interpolation question...
    • From: Wilson, Andrew, J
  • Re: An interpolation question...
    • From: Bill Hibbard