Final commit

Assets/Standard Assets/Utility/DynamicShadowSettings.cs

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+using System;
+using UnityEngine;
+
+namespace UnityStandardAssets.Utility
+{
+    public class DynamicShadowSettings : MonoBehaviour
+    {
+        public Light sunLight;
+        public float minHeight = 10;
+        public float minShadowDistance = 80;
+        public float minShadowBias = 1;
+        public float maxHeight = 1000;
+        public float maxShadowDistance = 10000;
+        public float maxShadowBias = 0.1f;
+        public float adaptTime = 1;
+
+        private float m_SmoothHeight;
+        private float m_ChangeSpeed;
+        private float m_OriginalStrength = 1;
+
+
+        private void Start()
+        {
+            m_OriginalStrength = sunLight.shadowStrength;
+        }
+
+
+        // Update is called once per frame
+        private void Update()
+        {
+            Ray ray = new Ray(Camera.main.transform.position, -Vector3.up);
+            RaycastHit hit;
+            float height = transform.position.y;
+            if (Physics.Raycast(ray, out hit))
+            {
+                height = hit.distance;
+            }
+
+            if (Mathf.Abs(height - m_SmoothHeight) > 1)
+            {
+                m_SmoothHeight = Mathf.SmoothDamp(m_SmoothHeight, height, ref m_ChangeSpeed, adaptTime);
+            }
+
+            float i = Mathf.InverseLerp(minHeight, maxHeight, m_SmoothHeight);
+
+            QualitySettings.shadowDistance = Mathf.Lerp(minShadowDistance, maxShadowDistance, i);
+            sunLight.shadowBias = Mathf.Lerp(minShadowBias, maxShadowBias, 1 - ((1 - i)*(1 - i)));
+            sunLight.shadowStrength = Mathf.Lerp(m_OriginalStrength, 0, i);
+        }
+    }
+}