将Spline移出Plugin，以调整SplineRenderer的OnWillCameraRender

Assets/Dreamteck/Splines/Components/Sample Modifiers/MeshScaleModifier.cs

@@ -0,0 +1,78 @@
+namespace Dreamteck.Splines
+{
+    using System.Collections;
+    using System.Collections.Generic;
+    using UnityEngine;
+
+    [System.Serializable]
+    public class MeshScaleModifier : SplineSampleModifier
+    {
+        [System.Serializable]
+        public class ScaleKey : Key
+        {
+            public Vector3 scale = Vector3.one;
+
+            public ScaleKey(double f, double t) : base(f, t)
+            {
+            }
+        }
+
+        public override bool hasKeys => keys.Count > 0;
+        public List<ScaleKey> keys = new List<ScaleKey>();
+
+        public MeshScaleModifier()
+        {
+            keys = new List<ScaleKey>();
+        }
+
+        public override List<Key> GetKeys()
+        {
+            List<Key> output = new List<Key>();
+            for (int i = 0; i < keys.Count; i++)
+            {
+                output.Add(keys[i]);
+            }
+            return output;
+        }
+
+        public override void SetKeys(List<Key> input)
+        {
+            keys = new List<ScaleKey>();
+            for (int i = 0; i < input.Count; i++)
+            {
+                keys.Add((ScaleKey)input[i]);
+            }
+        }
+
+        public void AddKey(double f, double t)
+        {
+            keys.Add(new ScaleKey(f, t));
+        }
+
+        public override void Apply(ref SplineSample result)
+        {
+            if (keys.Count == 0)
+            {
+                return;
+            }
+            for (int i = 0; i < keys.Count; i++)
+            {
+                result.size += keys[i].Evaluate(result.percent) * keys[i].scale.magnitude * blend;
+            }
+        }
+
+        public Vector3 GetScale(SplineSample sample)
+        {
+            Vector3 scale = Vector3.one;
+            for (int i = 0; i < keys.Count; i++)
+            {
+                float lerp = keys[i].Evaluate(sample.percent);
+                Vector3 scaleMultiplier = Vector3.Lerp(Vector3.one, keys[i].scale, lerp);
+                scale.x *= scaleMultiplier.x;
+                scale.y *= scaleMultiplier.y;
+                scale.z *= scaleMultiplier.z;
+            }
+            return Vector3.Lerp(Vector3.one, scale, blend);
+        }
+    }
+}