[vos-d] Online Space

[Peter Amstutz]

On Wed, Feb 07, 2007 at 08:57:18AM +0900, chris wrote:

> That is not to say this model cannot work as a hybrid system with
> portals at doorways, for space jumps etc. In fact, for very large
> scale solar/galaxy systems you would have to either use very high
> precision in the object system or maybe double precision with portals.
> 
> but to get optimal accuracy, scalability etc throughout where the
> avatar travels then the graohics engine should be looking at a
> continous floating origin.

Don't space-warping portals achive this effect?  When you walk through 
the portal (both the "rendering walk" as well as the actual avatar 
moving through), the space rendering is now centered on a new coordinate 
system.  Provided your sectors are relatively small, this seems to be 
more or less equivalent to the periodic recentering described in the 
Dungeon Siege paper you posted.  One of the points of the Dungeon Siege 
paper was also that recentering was a relatively expensive operation, so 
you didn't want to do it every frame, but only when the camera crossed 
certain boundaries, so it's not truely "continous" in the sense of doing 
it before every frame.  Besides, that's complete overkill, since the 
point here is precision problems crop up at distances of 30-40km from 
center (assuming 1 notron = 1m) so it takes a very very large world 
before this becomes a problem (or you're doing a geospatial 
simulation...)

Also, for Interreality, the issue is primarily one of representation, 
since we use an off the shelf 3D engine (Crystal Space).  So my concern 
is how you're going to actually represent those huge worlds (since you 
do have precision problems beyond 30-40km) as a downloaded map, once you 
have that data loaded in, rendering is a separate issue.

(I haven't had a chance to read those other links you posted, so perhaps 
those explain the idea in more detail).

-- 
[   Peter Amstutz  ][ tetron at interreality.org ][ peter.amstutz at gdit.com ]
[Lead Programmer][Interreality Project][Virtual Reality for the Internet]
[ VOS: Next Generation Internet Communication][ http://interreality.org ]
[ http://interreality.org/~tetron ][ pgpkey:  pgpkeys.mit.edu  18C21DF7 ]

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