Veeraghanta Field Generators (VFGs) are the main technology used for gravity manipulation. This allows for FTL travel, deflector shields, artificial gravity, and more efficient engines. It can’t nullify gravity’s effects on an object, or create a gravitational point from nothing, but it can exaggerate or reduce gravity’s effects. Most of the associated rules, however, come into play only when spacecraft are involved.
V.Fields in their simplest form are invariably spherical, although technology does exist that allows V.Fields to be ‘stretched’ into ellipsoids. Flat or polygonal fields are impossible, at least with today’s technology.
Powerful V.Field generators get temperamental/unpredictable in the presence of a large gravity well, so shields and artificial gravity are usually turned off or powered down when within orbital distance planetoid.
Most VFGs are placed near (but not usually at) a ship’s geometric center. On smaller ships, VFGs are usually found in main engineering, since engineering is in the third quarter of the ship as you move back from the bow. On bigger ships, however, the VFG used for gravity and shielding often has a dedicated room separate from main engineering.
As with natural gravity sources, opposing V.Fields can ‘cancel out’ each other’s effects (look at Lagrange points for an example in real life). This is most useful for artificial gravity. On big ships, the primary VFG is turned on low to provide gravity for the front half of the ship, while a smaller VFG near the stern is turned on high to provide gravity for the back half. On small ships with decks parallel to the direction of thrust, small VFGs are carefully placed and tuned within the decks to provide gravity, although this has some interesting effects on your sense of balance. A walk down a straight, flat corridor may feel downhill at first, then flat near the middle, then uphill at the end. The ability to avoid getting sick from this is space travel’s equivalent of sea legs. To save power and reduce the seasickness effect, artificial gravity on all ships is rarely kept at 1 full G; most Navies keep it somewhere around 0.6G.
V.Fields are also used for shielding ships from physical objects (they’re next to useless against directed energy weapons, but most navies don’t use them and rely on armor to handle the rare laser-wielding warship). However, since the ship’s shield generator usually doubles as the primary gravity generator, artificial gravity is always turned off when shields are active. When entering a battle, or traveling at sufficient velocities that micrometeroids become less of a maintenance nuisance and more of a real threat, shields are turned on and gravity’s turned off. Experienced spacers know this – “Huh. Gravity just went off. The captain must be in a hurry/ladar probably picked up a bogey.” Shield functions push VFGs to their limit, so they actually do function a lot more like a shield and less like armor you can turn off – in a battle, shields are only put at full power when an incoming projectile is detected. A clever electronics warfare specialist can take advantage of this to fool their sensors into thinking that an attack isn’t coming (so the shields are weaker) or thinking one is (so they keep their shields up and drain their energy faster).