refactor(mesh): mesh simplifier uses the simplification options struct

Previously, MeshSimplifier had separate fields for options, but has now
consolidated all those fields by making use of SimplificationOptions.
Additionally, the SimplificationOptions can be set as a block.

Runtime/MeshSimplifier.cs

@@ -67,17 +67,9 @@ public sealed class MeshSimplifier
         #endregion
 
         #region Fields
-        private bool preserveBorderEdges = false;
-        private bool preserveUVSeamEdges = false;
-        private bool preserveUVFoldoverEdges = false;
-        private bool preserveSurfaceCurvature = false;
-        private bool enableSmartLink = true;
-        private int maxIterationCount = 100;
-        private double agressiveness = 7.0;
+        SimplificationOptions simplificationOptions = SimplificationOptions.Default;
         private bool verbose = false;
 
-        private double vertexLinkDistanceSqr = double.Epsilon;
-
         private int subMeshCount = 0;
         private int[] subMeshOffsets = null;
         private ResizableArray<Triangle> triangles = null;
@@ -103,6 +95,16 @@ public sealed class MeshSimplifier
         #endregion
 
         #region Properties
+        /// <summary>
+        /// Gets or sets all of the simplification options as a single block.
+        /// Default value: SimplificationOptions.Default
+        /// </summary>
+        public SimplificationOptions SimplificationOptions
+        {
+            get { return this.simplificationOptions; }
+            set { this.simplificationOptions = value; }
+        }
+
         /// <summary>
         /// Gets or sets if the border edges should be preserved.
         /// Default value: false
@@ -120,8 +122,8 @@ public bool PreserveBorders
         /// </summary>
         public bool PreserveBorderEdges
         {
-            get { return preserveBorderEdges; }
-            set { preserveBorderEdges = value; }
+            get { return simplificationOptions.PreserveBorderEdges; }
+            set { simplificationOptions.PreserveBorderEdges = value; }
         }
 
         /// <summary>
@@ -141,8 +143,8 @@ public bool PreserveSeams
         /// </summary>
         public bool PreserveUVSeamEdges
         {
-            get { return preserveUVSeamEdges; }
-            set { preserveUVSeamEdges = value; }
+            get { return simplificationOptions.PreserveUVSeamEdges; }
+            set { simplificationOptions.PreserveUVSeamEdges = value; }
         }
 
         /// <summary>
@@ -162,8 +164,8 @@ public bool PreserveFoldovers
         /// </summary>
         public bool PreserveUVFoldoverEdges
         {
-            get { return preserveUVFoldoverEdges; }
-            set { preserveUVFoldoverEdges = value; }
+            get { return simplificationOptions.PreserveUVFoldoverEdges; }
+            set { simplificationOptions.PreserveUVFoldoverEdges = value; }
         }
 
         /// <summary>
@@ -172,8 +174,8 @@ public bool PreserveUVFoldoverEdges
         /// </summary>
         public bool PreserveSurfaceCurvature
         {
-            get { return preserveSurfaceCurvature; }
-            set { preserveSurfaceCurvature = value; }
+            get { return simplificationOptions.PreserveSurfaceCurvature; }
+            set { simplificationOptions.PreserveSurfaceCurvature = value; }
         }
 
         /// <summary>
@@ -184,8 +186,8 @@ public bool PreserveSurfaceCurvature
         /// </summary>
         public bool EnableSmartLink
         {
-            get { return enableSmartLink; }
-            set { enableSmartLink = value; }
+            get { return simplificationOptions.EnableSmartLink; }
+            set { simplificationOptions.EnableSmartLink = value; }
         }
 
         /// <summary>
@@ -195,8 +197,8 @@ public bool EnableSmartLink
         /// </summary>
         public int MaxIterationCount
         {
-            get { return maxIterationCount; }
-            set { maxIterationCount = value; }
+            get { return simplificationOptions.MaxIterationCount; }
+            set { simplificationOptions.MaxIterationCount = value; }
         }
 
         /// <summary>
@@ -205,8 +207,8 @@ public int MaxIterationCount
         /// </summary>
         public double Agressiveness
         {
-            get { return agressiveness; }
-            set { agressiveness = value; }
+            get { return simplificationOptions.Agressiveness; }
+            set { simplificationOptions.Agressiveness = value; }
         }
 
         /// <summary>
@@ -225,8 +227,8 @@ public bool Verbose
         /// </summary>
         public double VertexLinkDistance
         {
-            get { return Math.Sqrt(vertexLinkDistanceSqr); }
-            set { vertexLinkDistanceSqr = (value > double.Epsilon ? value * value : double.Epsilon); }
+            get { return simplificationOptions.VertexLinkDistance; }
+            set { simplificationOptions.VertexLinkDistance = value > double.Epsilon ? value : double.Epsilon; }
         }
 
         /// <summary>
@@ -236,8 +238,8 @@ public double VertexLinkDistance
         /// </summary>
         public double VertexLinkDistanceSqr
         {
-            get { return vertexLinkDistanceSqr; }
-            set { vertexLinkDistanceSqr = value; }
+            get { return simplificationOptions.VertexLinkDistance * simplificationOptions.VertexLinkDistance; }
+            set { simplificationOptions.VertexLinkDistance = Math.Sqrt(value); }
         }
 
         /// <summary>
@@ -496,7 +498,7 @@ private double CurvatureError(ref Vertex vert0, ref Vertex vert1)
                 {
                     Vector3d normVecTriangleWithViAndVjBoth = triangleWithViAndVjBoth.n;
                     double dot = Vector3d.Dot(ref normVecTriangleWithViOrVjOrBoth, ref normVecTriangleWithViAndVjBoth);
-                    
+
                     if (dot > maxDotInner)
                         maxDotInner = dot;
                 }
@@ -524,7 +526,7 @@ private double CalculateError(ref Vertex vert0, ref Vertex vert1, out Vector3d r
                     -1.0 / det * q.Determinant4()); // vz = A43/det(q_delta)
 
                 double curvatureError = 0;
-                if (preserveSurfaceCurvature)
+                if (simplificationOptions.PreserveSurfaceCurvature)
                 {
                     curvatureError = CurvatureError(ref vert0, ref vert1);
                 }
@@ -796,6 +798,9 @@ private void RemoveVertexPass(int startTrisCount, int targetTrisCount, double th
 
             Vector3d p;
             Vector3 barycentricCoord;
+            var preserveBorderEdges = PreserveBorderEdges;
+            var preserveUVSeamEdges = PreserveUVSeamEdges;
+            var preserveUVFoldoverEdges = PreserveUVFoldoverEdges;
             for (int tid = 0; tid < triangleCount; tid++)
             {
                 if (triangles[tid].dirty || triangles[tid].deleted || triangles[tid].err3 > threshold)
@@ -947,6 +952,8 @@ private void UpdateMesh(int iteration)
                 int borderVertexCount = 0;
                 double borderMinX = double.MaxValue;
                 double borderMaxX = double.MinValue;
+                var enableSmartLink = EnableSmartLink;
+                var vertexLinkDistanceSqr = VertexLinkDistanceSqr;
                 for (int i = 0; i < vertexCount; i++)
                 {
                     int tstart = vertices[i].tstart;
@@ -2199,6 +2206,8 @@ public void SimplifyMesh(float quality)
             var vertices = this.vertices.Data;
             int targetTrisCount = Mathf.RoundToInt(triangleCount * quality);
 
+            var maxIterationCount = MaxIterationCount;
+            var agressiveness = Agressiveness;
             for (int iteration = 0; iteration < maxIterationCount; iteration++)
             {
                 if ((startTrisCount - deletedTris) <= targetTrisCount)