The 3D models (PIDs or PlanetaryInteractiveDioramas) developed and under development by
Ultramundum Foundation deliver extremely large areas for free interactive exploration on a
standard personal computer, with an extremely high level of realism and realistic personal
/ veicular traffic.
The dimensions of the explorable environments reach far beyond what is possible today,
for example in the latest videogames, arriving to entire planets.
Larger planetary complexes can be simulated, arriving to star systems and groups of
stars. The technologies that can produce such a huge level of simulation are called
PlanetWide PIDs (PlanetaryInteractiveDioramas). They allow the exploration of a celestial
body of any dimension from space down to ground level, finding human-scale details and
reaching even the atomic and subatomic level. The supported range on the UltraPort
platform of the Ultramundum Foundation goes from 50 billions light years down to one
thousandth of the dimension of cosmic strings, presumably the smallest component of
PIDs are completely open source and their Tabulae (elements at the base of the
technology used) will be freely accessible and modifiable by everybody.
Thanks to the patented UltraPeg technology and the geographical Automatic Detail
generators, PIDs offer an interactive flight on all the city with the possibility of
descent to the ground level of any single street to walk amont he buildings. Getting
altitude the speed increases accordingly to allow for an exploration experience easy and
To create this kind of products, new software modules and procedures have been
developed, beyond the base procedural parametric technology UltraPeg based on Tabulae.
First, UltraPort supports the jerarchical cellular decomposition of the surface of
entire planets; this is achived with the PlanetSector system. It is composed by Tabulae
that are capable of automatically generate jearchical planetary surfaces, subdiving
progressively in subelements of the same type near the user's Avatar and so producing a
variable detail representation of the entire celestial body. In this way, near the
observer the terrain appears extremely detailed and the resolution lowers toward the
horizon, where there are farther portions; the user-perceived resolution appears constant.
An entire planet can be explored interactively and appear highly detailed everywhere, even
on low power and memory PCs. The jerarchical PlanetSectors structure id dynamic: when the
observer moves, the PlanetSectors toward his direction subdivide in others more detailed,
while those at the back are substituted by thier lower-resolution ancestors. The resulting
structure is highly dynamic and automatically modifies itself when the Avatar moves,
producing entire star systems that allow any kind of trips.
PlanetSectors thus represent portions of the planetary surface progressively more
detailed. They start from level zero, that covers the entire planet. Level 1 is composed
by two PlanetSectors, one for the north emisphere and one for the south. Level 2 is made
by six PlanetSectors, three for each emisphere. From level 3 onwards each PlanetSector
subdivides in four for each successive level, up to the maximum resolution. With this
technology the temperate regions PlanetSectors, where most of the cities are, have
approximately a square shape when projected on the planet spheroid, while the others are
progressively mre distorted.
A specific UltraPort module dynamically subdivides the Planetectors where the Avatar
is, leaving the farther away ones at a lower level, generating a variable detail structure
that shows an apparently extremely high resolution in any point of the planet.
Sophisticated systems position the PlanetSectors are 'plates' on the planet spheroid and
convert from euclidean coordinates to non-euclidean ones on a sphere, using all the
A special debug mode can be activated to see the PlanetSector bounding boxes and
coordinates. The coordinate of each planet sector is made from 3 numbers: the PlanetSecor
level (0 for the entire planet, 1 for the emisphere, ...), the longitude and the latitude
in PlanetSectors form Greenwich and the South pole.
A special debug camera can fly independently of the Avatar position, so that views of
the PlanetSectors strcture can be obtained. Without it, the system would continuously
update the scene to show a detailed view everywhere the Avatar moves.
Any Tabula, the data structure at the root of Ultramundum Foundation's UltraPeg
technology, can hold multiple data types. For the Turin city model, informations on
buildings positions, root maps, olympic areas placements and specific schematics have been
imported from Autocad files and other databases.
The Autocad file importer, called UltraTools, allows for fast and almost automatic
acquisition of public databases, converted in a very short time to three-dimensional
elements. All these data can then be explored in real-time.