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/*
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recast4j Copyright (c) 2015-2019 Piotr Piastucki piotr@jtilia.org
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DotRecast Copyright (c) 2023 Choi Ikpil ikpil@naver.com
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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using System;
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using System.Globalization;
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using System.IO;
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namespace DotRecast.Core
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{
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public static class RcObjImporter
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{
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public static RcObjImporterContext LoadContext(byte[] chunk)
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{
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RcObjImporterContext context = new RcObjImporterContext();
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try
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{
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using StreamReader reader = new StreamReader(new MemoryStream(chunk));
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string line;
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while ((line = reader.ReadLine()) != null)
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{
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line = line.Trim();
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ReadLine(line, context);
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}
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}
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catch (Exception e)
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{
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throw new Exception(e.Message, e);
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}
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return context;
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}
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public static void ReadLine(string line, RcObjImporterContext context)
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{
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if (line.StartsWith("v"))
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{
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ReadVertex(line, context);
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}
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else if (line.StartsWith("f"))
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{
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ReadFace(line, context);
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}
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}
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private static void ReadVertex(string line, RcObjImporterContext context)
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{
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if (line.StartsWith("v "))
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{
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float[] vert = ReadVector3f(line);
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foreach (float vp in vert)
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{
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context.vertexPositions.Add(vp);
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}
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}
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}
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private static float[] ReadVector3f(string line)
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{
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string[] v = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (v.Length < 4)
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{
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throw new Exception("Invalid vector, expected 3 coordinates, found " + (v.Length - 1));
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}
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// fix - https://github.com/ikpil/DotRecast/issues/7
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return new float[]
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{
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float.Parse(v[1], CultureInfo.InvariantCulture),
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float.Parse(v[2], CultureInfo.InvariantCulture),
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float.Parse(v[3], CultureInfo.InvariantCulture)
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};
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}
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private static void ReadFace(string line, RcObjImporterContext context)
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{
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string[] v = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (v.Length < 4)
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{
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throw new Exception("Invalid number of face vertices: 3 coordinates expected, found " + v.Length);
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}
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for (int j = 0; j < v.Length - 3; j++)
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{
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context.meshFaces.Add(ReadFaceVertex(v[1], context));
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for (int i = 0; i < 2; i++)
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{
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context.meshFaces.Add(ReadFaceVertex(v[2 + j + i], context));
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}
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}
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}
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private static int ReadFaceVertex(string face, RcObjImporterContext context)
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{
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string[] v = face.Split("/");
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return GetIndex(int.Parse(v[0]), context.vertexPositions.Count);
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}
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private static int GetIndex(int posi, int size)
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{
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if (posi > 0)
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{
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posi--;
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}
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else if (posi < 0)
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{
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posi = size + posi;
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}
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else
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{
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throw new Exception("0 vertex index");
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}
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return posi;
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}
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}
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}
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