1 files changed, 85 insertions, 0 deletions
diff --git a/Assets/ThirdParty/VRM/MeshUtility/Runtime/MeshExtensions.cs b/Assets/ThirdParty/VRM/MeshUtility/Runtime/MeshExtensions.cs
new file mode 100644
index 00000000..aa458d52
--- /dev/null
+++ b/Assets/ThirdParty/VRM/MeshUtility/Runtime/MeshExtensions.cs
@@ -0,0 +1,85 @@
+using UnityEngine;
+using System.Linq;
+
+
+namespace MeshUtility
+{
+    public static class MeshExtensions
+    {
+        public static Mesh Copy(this Mesh src, bool copyBlendShape)
+        {
+            var dst = new Mesh();
+            dst.name = src.name + "(copy)";
+#if UNITY_2017_3_OR_NEWER
+            dst.indexFormat = src.indexFormat;
+#endif
+
+            dst.vertices = src.vertices;
+            dst.normals = src.normals;
+            dst.tangents = src.tangents;
+            dst.colors = src.colors;
+            dst.uv = src.uv;
+            dst.uv2 = src.uv2;
+            dst.uv3 = src.uv3;
+            dst.uv4 = src.uv4;
+            dst.boneWeights = src.boneWeights;
+            dst.bindposes = src.bindposes;
+
+            dst.subMeshCount = src.subMeshCount;
+            for (int i = 0; i < dst.subMeshCount; ++i)
+            {
+                dst.SetIndices(src.GetIndices(i), src.GetTopology(i), i);
+            }
+
+            dst.RecalculateBounds();
+
+            if (copyBlendShape)
+            {
+                var vertices = src.vertices;
+                var normals = src.normals;
+#if VRM_NORMALIZE_BLENDSHAPE_TANGENT
+                var tangents = src.tangents.Select(x => (Vector3)x).ToArray();
+#else
+                Vector3[] tangents = null;
+#endif
+
+                for (int i = 0; i < src.blendShapeCount; ++i)
+                {
+                    src.GetBlendShapeFrameVertices(i, 0, vertices, normals, tangents);
+                    dst.AddBlendShapeFrame(
+                        src.GetBlendShapeName(i),
+                        src.GetBlendShapeFrameWeight(i, 0),
+                        vertices,
+                        normals,
+                        tangents
+                        );
+                }
+            }
+
+            return dst;
+        }
+
+        public static void ApplyRotationAndScale(this Mesh src, Matrix4x4 m)
+        {
+            m.SetColumn(3, new Vector4(0, 0, 0, 1)); // remove translation
+            src.ApplyMatrix(m);
+        }
+
+        public static void ApplyMatrix(this Mesh src, Matrix4x4 m)
+        {
+            src.vertices = src.vertices.Select(x => m.MultiplyPoint(x)).ToArray();
+            if (src.normals != null && src.normals.Length > 0)
+            {
+                src.normals = src.normals.Select(x => m.MultiplyVector(x)).ToArray();
+            }
+            if (src.tangents != null && src.tangents.Length > 0)
+            {
+                src.tangents = src.tangents.Select(x =>
+                {
+                    var t = m.MultiplyVector((Vector3)x);
+                    return new Vector4(t.x, t.y, t.z, x.w);
+                }).ToArray();
+            }
+        }
+    }
+}