v4.1.0

v4.1.0

GroundProvider is gone. Use TerrainInterface instead.

Breaking

• Deleted: GroundProvider, UniformGroundProvider, TerrainProviderAdapter, docs/ground_providers.md, and the FlightSimulator(launch, atmos, GroundProvider) overload.
• FlightSimulator now has two constructors: (launch, atmos, GroundSurface) for flat ground and (launch, atmos, TerrainInterface, model) for custom.

Porting

// Before
MyProvider p;
FlightSimulator sim(ball, atmos, p);

// After
FlightSimulator sim(ball, atmos, std::make_shared<MyTerrain>());

Mechanical translation:

• public GroundProvider → public TerrainInterface
• getGroundAt(x, y) → getSurfaceProperties(x, y); also implement getHeight and getNormal
• Remove the clone() override; TerrainInterface is passed by shared_ptr

See docs/terrain.md and examples/multi_ground_simulation.cpp for a working example.