Re: [Plib-devel] ROAM for plib

[Steve B. <sjb...@ai...>]

Sam Stickland wrote:

> And then I'd like to add frame coherence to it would be would nice, and
> doesn't sound that hard. (Basically instead of recalculating your triangle
> mesh every frame you adjust the previous one to fit.

Hmmm - but I'd still want FOV culling on the individual ROAM height grids
(there could be many of them in an application like FlightGear where terrain
is paged from disk).

If a ROAM 'object' is entirely off-screen, then the ROAM algorithm would
not be executed on that frame for that object.  I really think it's important
to work that way.

> And at some point in the future I'd really like to adjust ROAM to work in 3D
> rather than just 2D so I can add stuff like caves and tunnels to the
> landscape engine, but that's a far way off at the moment.

That would be very cool.  Sounds tricky though.

If each ROAM 'object' is independent though, you could build things like
caves by having a height grid for the floor, another (inverted) one for
the ceiling and a third for the surface of the ground above the roof
of the cave.

That's nowhere near as nice as a full 3D implementation - but it certainly
makes caves and overhangs do-able with the present algorithm.

-- 
Steve Baker                  http://web2.airmail.net/sjbaker1
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