switch root namespace name to NITLOAD

2026-09-02 18:15:03 +08:00
parent 4218baad48
commit 7c7101ee48
502 changed files with 710 additions and 721 deletions
@@ -0,0 +1,120 @@
+// -----------------------------------------------------------------------------
+// file="TriangulatedSurface"
+// Project: StgSharp
+// Copyright (c) Nitload.
+// SPDX-License-Identifier: MIT
+// -----------------------------------------------------------------------------
+
+using Nitload.Mathematics;
+using Nitload.Mathematics;
+using Nitload.Mathematics.Numeric.Graphics;
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+using System.Text;
+
+namespace Nitload.Geometries
+{
+    public class TriangulatedSurface
+    {
+
+        private HashSet<(int begin,int end)> _sides;
+
+        private List<List<int>> _sideIndices;
+        private List<int> _triangleIndices;
+        private List<Vec3> _vertices;
+
+        public TriangulatedSurface()
+        {
+            _triangleIndices = new List<int>();
+            _vertices = new List<Vec3>();
+            _sides = new HashSet<(int,int)>();
+            _sideIndices = new List<List<int>>();
+        }
+
+        /**/
+        public IEnumerable<List<int>> SideIndicesEnumeratble => _sideIndices;
+
+        /*
+        public Triangle GetTriangle( int index )
+        {
+            Vec3HP v1,v2,v3;
+            int t = index * 3;
+            v1 = _vertices[ t + 0 ];
+            v2 = _vertices[ t + 1 ];
+            v3 = _vertices[ t + 2 ];
+            return new Triangle( v1, v2, v3 );
+        }
+        /**/
+
+        public Span<Vec3> VertexSpan => CollectionsMarshal.AsSpan(_vertices);
+
+        public Span<int> TriangleIndicesSpan => CollectionsMarshal.AsSpan(_triangleIndices);
+
+        /**/
+        public void AddIndicesByOrder(
+                    int v1,
+                    int v2,
+                    int v3
+        )
+        {
+            _triangleIndices.Add(v1);
+            _triangleIndices.Add(v2);
+            _triangleIndices.Add(v3);
+            if (!(_sides.Remove((v1,v2)) || _sides.Remove((v2, v1)))) {
+                _ = _sides.Add((v1, v2));
+            }
+            if (!(_sides.Remove((v2, v3)) || _sides.Remove((v3, v2)))) {
+                _ = _sides.Add((v2, v3));
+            }
+            if (!(_sides.Remove((v3, v1)) || _sides.Remove((v1, v3)))) {
+                _ = _sides.Add((v3, v1));
+            }
+        }
+
+        public void AddVertexByOrder(
+                    Vec3 vertex
+        )
+        {
+            _vertices.Add(vertex);
+        }
+
+        public int TriangleCount()
+        {
+            return _triangleIndices.Count / 3;
+        }
+
+        public void TrimExcess()
+        {
+            _triangleIndices.TrimExcess();
+            _vertices.TrimExcess();
+            Dictionary<int, int> side_dictionary = _sides.ToDictionary(x => x.begin, x => x.end);
+            int begin = side_dictionary.First().Key;
+            List<int> sideLoop = new(begin);
+            _sideIndices.Add(sideLoop);
+            while (side_dictionary.Count > 0)
+            {
+                if (side_dictionary.Remove(begin, out begin))
+                {
+                    sideLoop.Add(begin);
+                } else
+                {
+                    begin = side_dictionary.First().Key;
+                    sideLoop = new List<int>(begin);
+                    _sideIndices.Add(sideLoop);
+                }
+            }
+            _sideIndices.TrimExcess();
+        }
+
+        public int VertexCount()
+        {
+            return _vertices.Count;
+        }
+
+    }
+}