reworked mesh decimation yes

LightlessSync/ThirdParty/Nanomesh/Base/Vector4FComparer.cs

@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+
+namespace Nanomesh
+{
+    public class Vector4FComparer : IEqualityComparer<Vector4F>
+    {
+        private static Vector4FComparer? _instance;
+        public static Vector4FComparer Default => _instance ??= new Vector4FComparer(0.0001f);
+
+        private readonly float _tolerance;
+
+        public Vector4FComparer(float tolerance)
+        {
+            _tolerance = tolerance;
+        }
+
+        public bool Equals(Vector4F x, Vector4F y)
+        {
+            return (int)(x.x / _tolerance) == (int)(y.x / _tolerance)
+                && (int)(x.y / _tolerance) == (int)(y.y / _tolerance)
+                && (int)(x.z / _tolerance) == (int)(y.z / _tolerance)
+                && (int)(x.w / _tolerance) == (int)(y.w / _tolerance);
+        }
+
+        public int GetHashCode(Vector4F obj)
+        {
+            return (int)(obj.x / _tolerance)
+                ^ ((int)(obj.y / _tolerance) << 2)
+                ^ ((int)(obj.z / _tolerance) >> 2)
+                ^ ((int)(obj.w / _tolerance) << 1);
+        }
+    }
+}