Function SpawnVehicleWake

TombEngine/Objects/Utils/VehicleHelpers.cpp:364–404

	}

	void SpawnVehicleWake(const ItemInfo& vehicleItem, const Vector3& relOffset, int waterHeight, bool isUnderwater)
	{
		constexpr auto COLOR_START		   = Color(0.75f, 0.75f, 0.75f, 0.75f);
		constexpr auto COLOR_END		   = Color(0.0f, 0.0f, 0.0f, 0.0f);
		constexpr auto LIFE_MAX			   = 2.5f;
		constexpr auto VEL_ABS			   = 4.0f;
		constexpr auto EXP_RATE_ON_WATER   = 6.0f;
		constexpr auto EXP_RATE_UNDERWATER = 1.5f;

		// Vehicle is out of water; return early.
		if (waterHeight == NO_HEIGHT)
			return;

		bool isMovingForward = (vehicleItem.Animation.Velocity.z >= 0.0f);

		// Determine tags.
		auto tagLeft = isMovingForward ? VehicleWakeEffectTag::FrontLeft : VehicleWakeEffectTag::BackLeft;
		auto tagRight = isMovingForward ? VehicleWakeEffectTag::FrontRight : VehicleWakeEffectTag::BackRight;

		// Determine key parameters.
		auto positions = GetVehicleWakePositions(vehicleItem, relOffset, waterHeight, isUnderwater, isMovingForward);
		auto dir = -vehicleItem.Pose.Orientation.ToDirection();
		short orient2D = isUnderwater ? vehicleItem.Pose.Orientation.z : 0;
		float life = isUnderwater ? (LIFE_MAX / 2) : LIFE_MAX;
		float vel = isMovingForward ? VEL_ABS : -VEL_ABS;
		float expRate = isUnderwater ? EXP_RATE_UNDERWATER : EXP_RATE_ON_WATER;

		// Spawn left wake.
		StreamerEffect.Spawn(
			vehicleItem.Index, (int)tagLeft,
			positions.first, dir, orient2D, COLOR_START, COLOR_END,
			0.0f, life, vel, expRate, 0,
			StreamerFeatherMode::Right, BlendMode::Additive);

		// Spawn right wake.
		StreamerEffect.Spawn(
			vehicleItem.Index, (int)tagRight,
			positions.second, dir, orient2D, COLOR_START, COLOR_END,
			0.0f, life, vel, expRate, 0,
			StreamerFeatherMode::Left, BlendMode::Additive);
	}

	void HandleVehicleSpeedometer(float vel, float velMax)
	{