I love the idea of planetary warfare. Planetary shields can be the atmosphere - this reduces incoming fire SEVERELY, because a round coming in from space gets burned apart in-atmosphere as it reenters, and also, soil absorbs blasts and shot very, very well. It disperses force, further reducing block damage.
Additional shielding comes in the form of a planetary shield. Very, very expensive; eats up tons of power; protects an entire planet at the atmosphere's limit (no new texture needed, just don't tell'em it's coming); is far more effective than a capital ship's weapons, and has enough shielding to survive a credible bombardment from a determined, powerful foe. Titans bring it to its knees fast enough, but not instantly. It should have a one-block "computer" and require a massive power grid that it CONSTANTLY draws from.
It can be turned off. But you'd be a fool to do so.
Ships coming in-atmosphere get NO shielding, whatsoever. Gravity should become more effective. Mass should add LOTS of force from gravity, rapidly overriding thrusters. Advanced armor will then become an absolute no-no unless you build a booster platform to launch heavy vessels out of atmosphere (say hello to the docked thrusterbox ... but I bet it can look nice.). I want to see that now ... got the launch of the Pillar of Autumn running through my head now, it just looks so cool.
We'd need a new propulsion block, basically a wheel. Treads are not necessary, tracked vehicles are a double line of wheels that each eat up a sizable bit of power (less than thrusters probably by far). Also, the more wheels, the slower you turn. Acceleration depends on a "wheel setting/track setting" option (Thrust Management, basically, and that tab can be used for this) - 50% power to turning and 50% to line acceleration ... or otherwise. THIS REQUIRES FRICTION!
Walkers become useful because of FRICTION! Because I want to see an AT-AT.
Ground vehicle based weapons are the same as starship weapons, but again, advanced armor has a horrible effect on your ability to traverse slopes and accelerate. And turn.
TL;DR: Atmosphere severely reduces incoming fire's damage and AoE, no shields in-atmosphere.
Gravity becomes more effective, on wheeled/tracked vehicles (using the same new block and a thrust-management tab of their own type, but can be the same one only re-used) AND starships. This will be adjusted so that advanced armor is an incredible sacrifice in other systems.
Planetary shield: emitter computer plus GIANT power array. Basically unbreachable unless you bring a Titan. Defends an entire planet at the atmosphere's boundary.
Friction!!! - so we can have walker battles with tanks and Warthog-type vehicles running around.
- also needs new AI options to manipulate these complicated things.
Gravity's effect will be so powerful now that large ships (bigger than a small fighter or bomber) will probably need a boost from a purpose-built booster pad. You'd be a fool to park a cruiser down there, because unfortunately, the Pillar of Autumn needs more power to lift off.
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IDEAS!