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/*******************************************************************************
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Copyright © 2015-2022 PICO Technology Co., Ltd.All rights reserved.
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NOTICE：All information contained herein is, and remains the property of
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PICO Technology Co., Ltd. The intellectual and technical concepts
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contained herein are proprietary to PICO Technology Co., Ltd. and may be
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covered by patents, patents in process, and are protected by trade secret or
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copyright law. Dissemination of this information or reproduction of this
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material is strictly forbidden unless prior written permission is obtained from
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PICO Technology Co., Ltd.
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*******************************************************************************/
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using UnityEngine;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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namespace Unity.XR.PXR
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{
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public class PXR_ObjImporter : MonoBehaviour
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{
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private static PXR_ObjImporter instance;
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public static PXR_ObjImporter Instance
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{
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get { return instance ?? (instance = new PXR_ObjImporter()); }
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}
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private List<int> triangles;
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private List<Vector3> vertices;
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private List<Vector2> uv;
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private List<Vector3> normals;
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private List<PxrVector3Int> faceData;
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private List<int> intArray;
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private const int MinPow10 = -16;
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private const int MaxPow10 = 16;
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private const int NumPows10 = MaxPow10 - MinPow10 + 1;
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private static readonly float[] pow10 = GenerateLookupTable();
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public Mesh ImportFile(string filePath)
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{
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triangles = new List<int>();
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vertices = new List<Vector3>();
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uv = new List<Vector2>();
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normals = new List<Vector3>();
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faceData = new List<PxrVector3Int>();
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intArray = new List<int>();
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LoadMeshData(filePath);
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Vector3[] newVerts = new Vector3[faceData.Count];
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Vector2[] newUVs = new Vector2[faceData.Count];
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Vector3[] newNormals = new Vector3[faceData.Count];
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for (int i = 0; i < faceData.Count; i++)
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{
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newVerts[i] = vertices[faceData[i].x - 1];
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if (faceData[i].y >= 1)
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newUVs[i] = uv[faceData[i].y - 1];
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if (faceData[i].z >= 1)
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newNormals[i] = normals[faceData[i].z - 1];
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}
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Mesh mesh = new Mesh();
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mesh.vertices = newVerts;
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mesh.uv = newUVs;
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mesh.normals = newNormals;
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mesh.triangles = triangles.ToArray();
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mesh.RecalculateBounds();
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return mesh;
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}
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private void LoadMeshData(string fileName)
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{
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StringBuilder sb = new StringBuilder();
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string text = File.ReadAllText(fileName);
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int start = 0;
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string objectName = null;
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int faceDataCount = 0;
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StringBuilder sbFloat = new StringBuilder();
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for (int i = 0; i < text.Length; i++)
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{
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if (text[i] == '\n')
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{
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sb.Remove(0, sb.Length);
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sb.Append(text, start + 1, i - start);
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start = i;
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if (sb[0] == 'o' && sb[1] == ' ')
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{
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sbFloat.Remove(0, sbFloat.Length);
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int j = 2;
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while (j < sb.Length)
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{
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objectName += sb[j];
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j++;
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}
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}
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else if (sb[0] == 'v' && sb[1] == ' ') // Vertices
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{
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int splitStart = 2;
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vertices.Add(new Vector3(GetFloat(sb, ref splitStart, ref sbFloat),
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GetFloat(sb, ref splitStart, ref sbFloat), GetFloat(sb, ref splitStart, ref sbFloat)));
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}
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else if (sb[0] == 'v' && sb[1] == 't' && sb[2] == ' ') // UV
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{
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int splitStart = 3;
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uv.Add(new Vector2(GetFloat(sb, ref splitStart, ref sbFloat),
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GetFloat(sb, ref splitStart, ref sbFloat)));
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}
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else if (sb[0] == 'v' && sb[1] == 'n' && sb[2] == ' ') // Normals
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{
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int splitStart = 3;
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normals.Add(new Vector3(GetFloat(sb, ref splitStart, ref sbFloat),
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GetFloat(sb, ref splitStart, ref sbFloat), GetFloat(sb, ref splitStart, ref sbFloat)));
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}
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else if (sb[0] == 'f' && sb[1] == ' ')
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{
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int splitStart = 2;
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int j = 1;
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intArray.Clear();
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int info = 0;
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while (splitStart < sb.Length && char.IsDigit(sb[splitStart]))
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{
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faceData.Add(new PxrVector3Int(GetInt(sb, ref splitStart, ref sbFloat),
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GetInt(sb, ref splitStart, ref sbFloat), GetInt(sb, ref splitStart, ref sbFloat)));
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j++;
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intArray.Add(faceDataCount);
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faceDataCount++;
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}
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info += j;
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j = 1;
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while (j + 2 < info)
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{
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triangles.Add(intArray[0]);
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triangles.Add(intArray[j]);
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triangles.Add(intArray[j + 1]);
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j++;
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}
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}
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}
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}
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}
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private float GetFloat(StringBuilder sb, ref int start, ref StringBuilder sbFloat)
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{
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sbFloat.Remove(0, sbFloat.Length);
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while (start < sb.Length &&
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(char.IsDigit(sb[start]) || sb[start] == '-' || sb[start] == '.'))
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{
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sbFloat.Append(sb[start]);
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start++;
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}
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start++;
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return ParseFloat(sbFloat);
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}
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private int GetInt(StringBuilder sb, ref int start, ref StringBuilder sbInt)
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{
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sbInt.Remove(0, sbInt.Length);
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while (start < sb.Length &&
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(char.IsDigit(sb[start])))
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{
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sbInt.Append(sb[start]);
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start++;
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}
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start++;
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return IntParseFast(sbInt);
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}
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private static float[] GenerateLookupTable()
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{
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var result = new float[(-MinPow10 + MaxPow10) * 10];
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for (int i = 0; i < result.Length; i++)
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result[i] = (float)((i / NumPows10) *
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Mathf.Pow(10, i % NumPows10 + MinPow10));
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return result;
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}
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private float ParseFloat(StringBuilder value)
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{
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float result = 0;
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bool negate = false;
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int len = value.Length;
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int decimalIndex = value.Length;
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for (int i = len - 1; i >= 0; i--)
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if (value[i] == '.')
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{ decimalIndex = i; break; }
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int offset = -MinPow10 + decimalIndex;
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for (int i = 0; i < decimalIndex; i++)
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if (i != decimalIndex && value[i] != '-')
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result += pow10[(value[i] - '0') * NumPows10 + offset - i - 1];
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else if (value[i] == '-')
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negate = true;
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for (int i = decimalIndex + 1; i < len; i++)
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if (i != decimalIndex)
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result += pow10[(value[i] - '0') * NumPows10 + offset - i];
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if (negate)
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result = -result;
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return result;
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}
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private int IntParseFast(StringBuilder value)
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{
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int result = 0;
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for (int i = 0; i < value.Length; i++)
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{
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result = 10 * result + (value[i] - 48);
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}
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return result;
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}
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}
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public sealed class PxrVector3Int
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{
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public int x { get; set; }
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public int y { get; set; }
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public int z { get; set; }
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public PxrVector3Int() { }
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public PxrVector3Int(int intX, int intY, int intZ)
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{
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x = intX;
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y = intY;
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z = intZ;
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}
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}
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}
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