| | | 1 | | // <copyright file="ObjFile.cs" company="Jérémy Ansel"> |
| | | 2 | | // Copyright (c) 2017, 2019 Jérémy Ansel |
| | | 3 | | // </copyright> |
| | | 4 | | // <license> |
| | | 5 | | // Licensed under the MIT license. See LICENSE.txt |
| | | 6 | | // </license> |
| | | 7 | | |
| | | 8 | | using System.Numerics; |
| | | 9 | | using System.Text; |
| | | 10 | | |
| | | 11 | | namespace JeremyAnsel.Media.WavefrontObj; |
| | | 12 | | |
| | | 13 | | public class ObjFile |
| | | 14 | | { |
| | 4 | 15 | | public ObjFile() |
| | | 16 | | { |
| | 4 | 17 | | Vertices = new List<ObjVertex>(); |
| | 4 | 18 | | ParameterSpaceVertices = new List<ObjVector3>(); |
| | 4 | 19 | | VertexNormals = new List<ObjVector3>(); |
| | 4 | 20 | | TextureVertices = new List<ObjVector3>(); |
| | 4 | 21 | | Points = new List<ObjPoint>(); |
| | 4 | 22 | | Lines = new List<ObjLine>(); |
| | 4 | 23 | | Faces = new List<ObjFace>(); |
| | 4 | 24 | | Curves = new List<ObjCurve>(); |
| | 4 | 25 | | Curves2D = new List<ObjCurve2D>(); |
| | 4 | 26 | | Surfaces = new List<ObjSurface>(); |
| | 4 | 27 | | SurfaceConnections = new List<ObjSurfaceConnection>(); |
| | 4 | 28 | | DefaultGroup = new ObjGroup(); |
| | 4 | 29 | | Groups = new List<ObjGroup>(); |
| | 4 | 30 | | MergingGroupResolutions = new Dictionary<int, float>(); |
| | 4 | 31 | | MapLibraries = new List<string>(); |
| | 4 | 32 | | MaterialLibraries = new List<string>(); |
| | 4 | 33 | | } |
| | | 34 | | |
| | 4 | 35 | | public string? HeaderText { get; set; } |
| | | 36 | | |
| | 4 | 37 | | public List<ObjVertex> Vertices { get; private set; } |
| | | 38 | | |
| | 4 | 39 | | public List<ObjVector3> ParameterSpaceVertices { get; private set; } |
| | | 40 | | |
| | 4 | 41 | | public List<ObjVector3> VertexNormals { get; private set; } |
| | | 42 | | |
| | 4 | 43 | | public List<ObjVector3> TextureVertices { get; private set; } |
| | | 44 | | |
| | 4 | 45 | | public List<ObjPoint> Points { get; private set; } |
| | | 46 | | |
| | 4 | 47 | | public List<ObjLine> Lines { get; private set; } |
| | | 48 | | |
| | 4 | 49 | | public List<ObjFace> Faces { get; private set; } |
| | | 50 | | |
| | 4 | 51 | | public List<ObjCurve> Curves { get; private set; } |
| | | 52 | | |
| | 4 | 53 | | public List<ObjCurve2D> Curves2D { get; private set; } |
| | | 54 | | |
| | 4 | 55 | | public List<ObjSurface> Surfaces { get; private set; } |
| | | 56 | | |
| | 4 | 57 | | public List<ObjSurfaceConnection> SurfaceConnections { get; private set; } |
| | | 58 | | |
| | 4 | 59 | | public ObjGroup DefaultGroup { get; private set; } |
| | | 60 | | |
| | 4 | 61 | | public List<ObjGroup> Groups { get; private set; } |
| | | 62 | | |
| | 4 | 63 | | public Dictionary<int, float> MergingGroupResolutions { get; private set; } |
| | | 64 | | |
| | 4 | 65 | | public List<string> MapLibraries { get; private set; } |
| | | 66 | | |
| | 4 | 67 | | public List<string> MaterialLibraries { get; private set; } |
| | | 68 | | |
| | 4 | 69 | | public string? ShadowObjectFileName { get; set; } |
| | | 70 | | |
| | 4 | 71 | | public string? TraceObjectFileName { get; set; } |
| | | 72 | | |
| | | 73 | | public static ObjFile FromFile(string? path) |
| | | 74 | | { |
| | 4 | 75 | | return FromFile(path, ObjFileReaderSettings.Default); |
| | | 76 | | } |
| | | 77 | | |
| | | 78 | | public static ObjFile FromFile(string? path, ObjFileReaderSettings settings) |
| | | 79 | | { |
| | 4 | 80 | | if (path == null) |
| | | 81 | | { |
| | 4 | 82 | | throw new ArgumentNullException(nameof(path)); |
| | | 83 | | } |
| | | 84 | | |
| | 4 | 85 | | using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read)) |
| | | 86 | | { |
| | 4 | 87 | | return ObjFileReader.FromStream(stream, settings); |
| | | 88 | | } |
| | 4 | 89 | | } |
| | | 90 | | |
| | | 91 | | public static ObjFile FromStream(Stream? stream) |
| | | 92 | | { |
| | 4 | 93 | | return FromStream(stream, ObjFileReaderSettings.Default); |
| | | 94 | | } |
| | | 95 | | |
| | | 96 | | public static ObjFile FromStream(Stream? stream, ObjFileReaderSettings settings) |
| | | 97 | | { |
| | 4 | 98 | | return ObjFileReader.FromStream(stream, settings); |
| | | 99 | | } |
| | | 100 | | |
| | | 101 | | public void WriteTo(string? path) |
| | | 102 | | { |
| | 4 | 103 | | if (path == null) |
| | | 104 | | { |
| | 4 | 105 | | throw new ArgumentNullException(nameof(path)); |
| | | 106 | | } |
| | | 107 | | |
| | 4 | 108 | | using (var writer = new StreamWriter(path)) |
| | | 109 | | { |
| | 4 | 110 | | ObjFileWriter.Write(this, writer); |
| | 4 | 111 | | } |
| | 4 | 112 | | } |
| | | 113 | | |
| | | 114 | | public void WriteTo(Stream? stream) |
| | | 115 | | { |
| | 4 | 116 | | if (stream == null) |
| | | 117 | | { |
| | 4 | 118 | | throw new ArgumentNullException(nameof(stream)); |
| | | 119 | | } |
| | | 120 | | |
| | 4 | 121 | | using (var writer = new StreamWriter(stream, new UTF8Encoding(false, true), 1024, true)) |
| | | 122 | | { |
| | 4 | 123 | | ObjFileWriter.Write(this, writer); |
| | 4 | 124 | | } |
| | 4 | 125 | | } |
| | | 126 | | |
| | | 127 | | public void CalculateFaceNormals() |
| | | 128 | | { |
| | 4 | 129 | | var faceAreaDirections = new Vector3[Faces.Count]; |
| | 4 | 130 | | var adjacentFacesMap = Enumerable.Range(0, Vertices.Count).Select(item => new List<int>()).ToArray(); |
| | | 131 | | |
| | 4 | 132 | | for (int faceindex = 0; faceindex < Faces.Count; faceindex++) |
| | | 133 | | { |
| | 4 | 134 | | var face = Faces[faceindex]; |
| | | 135 | | |
| | 4 | 136 | | faceAreaDirections[faceindex] = CalculateFaceAreaDirection(face); |
| | | 137 | | |
| | 4 | 138 | | foreach (var triplet in face.Vertices) |
| | | 139 | | { |
| | 4 | 140 | | adjacentFacesMap[triplet.Vertex - 1].Add(faceindex); |
| | | 141 | | } |
| | | 142 | | } |
| | | 143 | | |
| | 4 | 144 | | var reuseNormals = new Dictionary<Vector3, int>(); |
| | | 145 | | |
| | 4 | 146 | | for (int normalIndex = 0; normalIndex < VertexNormals.Count; ++normalIndex) |
| | | 147 | | { |
| | 0 | 148 | | reuseNormals[VertexNormals[normalIndex].ToVector3()] = normalIndex + 1; |
| | | 149 | | } |
| | | 150 | | |
| | | 151 | | // 3dmax and other software interpret smooth groups as a bit mask. |
| | 0 | 152 | | Func<ObjPolygonalElement, ObjPolygonalElement, bool> smoothFunc = (l, r) => (l.SmoothingGroupNumber & r.Smoothin |
| | | 153 | | |
| | | 154 | | // this should be used if no actual smooth groups are defined, but right now it's not possible to tell. |
| | 4 | 155 | | if (Faces.All(f => f.SmoothingGroupNumber == 0)) smoothFunc = (l, r) => true; |
| | | 156 | | |
| | 4 | 157 | | for (int faceIndex = 0; faceIndex < Faces.Count; ++faceIndex) |
| | | 158 | | { |
| | 4 | 159 | | var face = Faces[faceIndex]; |
| | | 160 | | |
| | 4 | 161 | | for (int tripletIndex = 0; tripletIndex < face.Vertices.Count; ++tripletIndex) |
| | | 162 | | { |
| | 4 | 163 | | var v = face.Vertices[tripletIndex]; |
| | 4 | 164 | | if (v.Normal > 0) continue; |
| | | 165 | | |
| | 4 | 166 | | var adjacentFaces = adjacentFacesMap[v.Vertex - 1]; |
| | | 167 | | |
| | 4 | 168 | | Vector3 normal = faceAreaDirections[faceIndex]; |
| | | 169 | | |
| | 4 | 170 | | normal = adjacentFaces |
| | 4 | 171 | | .Where(idx => idx != faceIndex && smoothFunc(face, Faces[idx])) |
| | 4 | 172 | | .Aggregate(normal, (accum, fi) => accum + faceAreaDirections[fi]); |
| | | 173 | | |
| | 4 | 174 | | if (normal == Vector3.Zero) |
| | | 175 | | { |
| | 0 | 176 | | normal = Vertices[v.Vertex].Position.ToVector3(); |
| | | 177 | | } |
| | | 178 | | |
| | 4 | 179 | | normal = Vector3.Normalize(normal); |
| | | 180 | | |
| | 4 | 181 | | if (float.IsNaN(normal.X) || float.IsNaN(normal.Y) || float.IsNaN(normal.Z)) throw new InvalidOperationE |
| | | 182 | | |
| | 4 | 183 | | if (!reuseNormals.TryGetValue(normal, out var normalIdx)) |
| | | 184 | | { |
| | 4 | 185 | | VertexNormals.Add(normal); |
| | 4 | 186 | | normalIdx = VertexNormals.Count; |
| | 4 | 187 | | reuseNormals[normal] = normalIdx; |
| | | 188 | | } |
| | | 189 | | |
| | 4 | 190 | | v.Normal = normalIdx; |
| | | 191 | | |
| | 4 | 192 | | face.Vertices[tripletIndex] = v; |
| | | 193 | | } |
| | | 194 | | } |
| | 4 | 195 | | } |
| | | 196 | | |
| | | 197 | | private Vector3 CalculateFaceAreaDirection(ObjFace face) |
| | | 198 | | { |
| | 4 | 199 | | var v0 = Vertices[face.Vertices[0].Vertex - 1].Position.ToVector3(); |
| | | 200 | | |
| | 4 | 201 | | Vector3 n = Vector3.Zero; |
| | | 202 | | |
| | 4 | 203 | | for (int k = 2; k < face.Vertices.Count; k++) |
| | | 204 | | { |
| | 4 | 205 | | var v1 = Vertices[face.Vertices[k - 1].Vertex - 1].Position.ToVector3(); |
| | 4 | 206 | | var v2 = Vertices[face.Vertices[k].Vertex - 1].Position.ToVector3(); |
| | | 207 | | |
| | 4 | 208 | | n += Vector3.Cross(v1 - v0, v2 - v0) / 2; |
| | | 209 | | } |
| | | 210 | | |
| | 4 | 211 | | return n; // do NOT normalize, may be zero if triangle is degenerated. |
| | | 212 | | } |
| | | 213 | | } |