lol.cpp

void Level::makeScene() {

	auto defaultMaterial = Phys::Material{ "default" };
	defaultMaterial.density = 0.1f;

	addChild([&] {
		int side = 100;
		auto heightmap = make_shared<std::vector<float>>(makeHeightmap(side, side));

		auto obj = make_unique<Object>(self, Vector::Zero);
		obj->addComponent([&] {
			auto cube = make_unique<Renderable>(
				*obj, 
				Layers::Scene, 
				_makeTerrainMesh(*heightmap, side, side),
				getShader("normal").unwrap()
			);
			cube->cullMode = Renderable::CullMode::None;
			cube->color = Color::fromRGB(0xffefae);
			return cube;
		}());
		obj->addComponent([&] {
			auto body = make_unique<Phys::Body>(*obj, *world, defaultMaterial, PhysGroup::Vehicle, Phys::BodyType::Static);
			body->addHeightmap(heightmap, side, side);
			return body;
		}());

		return obj;
	}());

	addChild([&] {
		auto obj = make_unique<Object>(self, Vector(0, 10, -10));
		auto size = Vector{ 1.8f, 1.5f, 4.f };
		auto hs = size * 0.5f;

		obj->addComponent([&] {
			auto cube = make_unique<Renderable>(*obj, Layers::Scene, "texturedCube", "normal");
			cube->color = Color::Blue;
			cube->scale = size;
			return cube;
		}());

		obj->addComponent([&] {
			auto body = make_unique<Phys::Body>(*obj, *world, defaultMaterial, PhysGroup::Vehicle);
			body->addBoxShape(size);

			float depth = 0.5f;
			const auto wheelPositions = {
				Vector{ 1.f, -depth, 1.f },
				Vector{ -1.f, -depth, 1.f },
				Vector{ 1.f, -depth, -1.f },
				Vector{ -1.f, -depth, -1.f },
			};

			for(auto&& pos : wheelPositions) {
				auto& wheel = body->addWheel(pos, Vector::NegativeUnitY, Vector::NegativeUnitX, 0.5f, 0.6f);
				wheel.childObject = &self.addChild([&]() {
					auto obj = make_unique<Object>(self, Vector::Zero);
					obj->addComponent([&] {
						auto cube = make_unique<Renderable>(*obj, Layers::Scene, "texturedCube", "normal");
						cube->color = Color::Red;
						return cube;
					}());

					return obj;
				}());
			}

			return body;
		}());
		return obj;
	}());
}

what does this mean @Tomcc ?