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Assets/Standard Assets/Vehicles/Aircraft/Scripts/LandingGear.cs

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+using System;
+using UnityEngine;
+
+namespace UnityStandardAssets.Vehicles.Aeroplane
+{
+    public class LandingGear : MonoBehaviour
+    {
+
+        private enum GearState
+        {
+            Raised = -1,
+            Lowered = 1
+        }
+
+        // The landing gear can be raised and lowered at differing altitudes.
+        // The gear is only lowered when descending, and only raised when climbing.
+
+        // this script detects the raise/lower condition and sets a parameter on
+        // the animator to actually play the animation to raise or lower the gear.
+
+        public float raiseAtAltitude = 40;
+        public float lowerAtAltitude = 40;
+
+        private GearState m_State = GearState.Lowered;
+        private Animator m_Animator;
+        private Rigidbody m_Rigidbody;
+        private AeroplaneController m_Plane;
+
+        // Use this for initialization
+        private void Start()
+        {
+            m_Plane = GetComponent<AeroplaneController>();
+            m_Animator = GetComponent<Animator>();
+            m_Rigidbody = GetComponent<Rigidbody>();
+        }
+
+
+        // Update is called once per frame
+        private void Update()
+        {
+            if (m_State == GearState.Lowered && m_Plane.Altitude > raiseAtAltitude && m_Rigidbody.velocity.y > 0)
+            {
+                m_State = GearState.Raised;
+            }
+
+            if (m_State == GearState.Raised && m_Plane.Altitude < lowerAtAltitude && m_Rigidbody.velocity.y < 0)
+            {
+                m_State = GearState.Lowered;
+            }
+
+            // set the parameter on the animator controller to trigger the appropriate animation
+            m_Animator.SetInteger("GearState", (int) m_State);
+        }
+    }
+}