From 21b3cd6caa35ec64042a8a6dce5055151f114852 Mon Sep 17 00:00:00 2001
From: ikpil <ikpil@naver.com>
Date: Fri, 27 Oct 2023 00:03:03 +0900
Subject: [PATCH] refactor: RcVec3f.Lerp

---
 src/DotRecast.Core/Numerics/RcVec3f.cs   | 13 ++++----
 test/DotRecast.Core.Test/Vector3Tests.cs | 38 +++++++++++-------------
 2 files changed, 25 insertions(+), 26 deletions(-)

diff --git a/src/DotRecast.Core/Numerics/RcVec3f.cs b/src/DotRecast.Core/Numerics/RcVec3f.cs
index 6b6cf1e..e449d5e 100644
--- a/src/DotRecast.Core/Numerics/RcVec3f.cs
+++ b/src/DotRecast.Core/Numerics/RcVec3f.cs
@@ -228,13 +228,14 @@ namespace DotRecast.Core.Numerics
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static RcVec3f Lerp(RcVec3f v1, RcVec3f v2, float t)
+        public static RcVec3f Lerp(RcVec3f value1, RcVec3f value2, float amount)
         {
-            return new RcVec3f(
-                v1.X + (v2.X - v1.X) * t,
-                v1.Y + (v2.Y - v1.Y) * t,
-                v1.Z + (v2.Z - v1.Z) * t
-            );
+            return (value1 * (1f - amount)) + (value2 * amount);
+            // return new RcVec3f(
+            //     value1.X + (value2.X - value1.X) * amount,
+            //     value1.Y + (value2.Y - value1.Y) * amount,
+            //     value1.Z + (value2.Z - value1.Z) * amount
+            // );
         }
 
         /// Returns the distance between two points.
diff --git a/test/DotRecast.Core.Test/Vector3Tests.cs b/test/DotRecast.Core.Test/Vector3Tests.cs
index 37d1798..975a733 100644
--- a/test/DotRecast.Core.Test/Vector3Tests.cs
+++ b/test/DotRecast.Core.Test/Vector3Tests.cs
@@ -99,13 +99,18 @@ public class Vector3Tests
     {
         var v1 = new Vector3(Random.Shared.NextSingle(), Random.Shared.NextSingle(), Random.Shared.NextSingle());
         var array1 = new float[3];
+        var array2 = new float[3];
         v1.CopyTo(array1);
+        v1.CopyTo(array2, 0);
 
         var v11 = new RcVec3f(v1.X, v1.Y, v1.Z);
         var array11 = new float[3];
+        var array22 = new float[3];
         v11.CopyTo(array11);
+        v11.CopyTo(array22, 0);
 
         Assert.That(array1, Is.EqualTo(array11));
+        Assert.That(array2, Is.EqualTo(array22));
     }
 
     [Test]
@@ -167,26 +172,19 @@ public class Vector3Tests
 
     [Test]
     [Repeat(100000)]
-    public void TestVectorIsFinite()
+    public void TestVectorLerp()
     {
-        // IsFinite
+        var amt = Random.Shared.NextSingle();
+        var v1 = new Vector3(Random.Shared.NextSingle(), Random.Shared.NextSingle(), Random.Shared.NextSingle());
+        var v2 = new Vector3(Random.Shared.NextSingle(), Random.Shared.NextSingle(), Random.Shared.NextSingle());
+        var v3 = Vector3.Lerp(v1, v2, amt);
+    
+        var v11 = new RcVec3f(v1.X, v1.Y, v1.Z);
+        var v22 = new RcVec3f(v2.X, v2.Y, v2.Z);
+        var v33 = RcVec3f.Lerp(v11, v22, amt);
+    
+        Assert.That(v3.X, Is.EqualTo(v33.X));
+        Assert.That(v3.Y, Is.EqualTo(v33.Y));
+        Assert.That(v3.Z, Is.EqualTo(v33.Z));
     }
-
-    // [Test]
-    // [Repeat(100000)]
-    // public void TestVectorLerp()
-    // {
-    //     var amt = Random.Shared.NextSingle();
-    //     var v1 = new Vector3(Random.Shared.NextSingle(), Random.Shared.NextSingle(), Random.Shared.NextSingle());
-    //     var v2 = new Vector3(Random.Shared.NextSingle(), Random.Shared.NextSingle(), Random.Shared.NextSingle());
-    //     var v3 = Vector3.Lerp(v1, v2, amt);
-    //
-    //     var v11 = new RcVec3f(v1.X, v1.Y, v1.Z);
-    //     var v22 = new RcVec3f(v2.X, v2.Y, v2.Z);
-    //     var v33 = RcVec3f.Lerp(v11, v22, amt);
-    //
-    //     Assert.That(v3.X, Is.EqualTo(v33.X));
-    //     Assert.That(v3.Y, Is.EqualTo(v33.Y));
-    //     Assert.That(v3.Z, Is.EqualTo(v33.Z));
-    // }
 }
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