John,
Q: what precision of numbers for z depth is passed between the graphics card and
Java3D: single precision floats? The reason I
ask is that if J3D is restricting itself to
single precision then there is not enough precision to handle the range Thomas Auinger
required for his planets while at the same time having adequate precision close in to a
small satelite or on the surface of the planet. I am more familiar with this sort of
mathematical limitation in a different
type of problem which it manifests itself in jittery motion in VRML due to VRML being
constrained to single
precision fp for field values.
Chris
John Wright wrote:
> Chris,
>
> The precision of the Z-buffer is dependent upon the graphics card /
> driver not Java 3D. For a typical video card we assume 16 bits of
> Z-Buffer and the recommendation of Sun for a 3000 ratio.
>
> Note: the values that you set for front and back clip are NOT the actual
> positions where the clipping will occur. These values are scaled based
> on other factors of your view platform.
>
> - John Wright
> Starfire Research
>
> chris thorne wrote:
> >
> (snip)
> > I do not know where he gets the 3000 from.
> >
> > Question to Doug and others:
> >
> > Q: what is the precision of the Z-buffer in J3D?
> > Q: is the precision of the Z-buffer in J3D platform dependent?
> > Q: what ratio of back/front is appropriate for typical platforms?
> >
> > regards,
> >
> > Chris
>
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