[Papervision3D] CNN magic map

[Joachim Lous]

On Fri, Nov 7, 2008 at 12:36 PM, Gordon Everett <gordee at hotmail.co.uk> wrote:
> "The typical table-like surface showcases are a poor match for 3D"
>
> Not sure why you say this... It all happens on a screen, which is flat

Yes, but the normal viewing angle for a typical vertical or handheld screen is
roughly head-on. You use that assumption in rendering, and the projection
will support the illusion of depth in typical use.

A table is differnt: it is very rarely looked at from straight above
it, you usually
see it from the side, and the angle you see it from (both pitch and
especially yaw)
vary quite a lot.  You can optimize the projection for some other
direction than head-on,
but only one specific one at a time.

Whenever the assumed and real viewer directions diverge badly,
especially in yaw,
projection artifacts will become very evident and weaken the illusion.
More like a poster and less like a window, if you see what I mean.

Not saying "don't do it", just don't expect it to have the same wow-factor as
the utterly convincing 2D tabletop illusion, and it may even fall
short of what we're
already used to from 'traditional' projected 3D in games and movies.

Unless you have live head tracking and adjust the projection accordingly; _then_
we're talking. But only for a single user at a time, alas