feat: created CarPhysics class

src/car_physics.cpp

@@ -0,0 +1,16 @@
+#include "car_physics.hpp"
+namespace godot {
+void CarPhysics::_bind_methods() {
+#define CLASSNAME CarPhysics
+void CarPhysics::_enter_tree() {
+    this->set_use_custom_integrator(true);
+}
+
+void CarPhysics::_integrate_forces(PhysicsDirectBodyState3D *state) {
+}
+
+const float CarPhysics::ACCELERATION{20.f};
+const float CarPhysics::BRAKE_FORCE{5.f};
+const float CarPhysics::UNDERSTEER_SPEED_MUL{0.f};
+const float CarPhysics::OVERSTEER_SPEED_MUL{0.f};
+}

src/car_physics.hpp

@@ -0,0 +1,19 @@
+#ifndef CAR_PHYSICS_HPP
+#define CAR_PHYSICS_HPP
+
+namespace godot {
+class CarPhysics : public RigidBody3D {
+    GDCLASS(CarPhysics, RigidBody3D);
+    static void _bind_methods();
+public:
+    virtual void _enter_tree() override;
+    virtual void _integrate_forces(PhysicsDirectBodyState3D *state) override;
+private:
+    static const float ACCELERATION;
+    static const float BRAKE_FORCE;
+    static const float UNDERSTEER_SPEED_MUL;
+    static const float OVERSTEER_SPEED_MUL;
+};
+}
+
+#endif // !CAR_PHYSICS_HPP