244 lines
8.0 KiB
C#
244 lines
8.0 KiB
C#
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/// <summary>
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/// This is a simple utility class for importing obj files into a Unity mesh at runtime.
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/// This version of ObjImporter first reads through the entire file, getting a count of how large
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/// the final arrays will be, and then uses standard arrays for everything (as opposed to ArrayLists
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/// or any other fancy things).
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/// \author el anónimo at the UnifyCommunity wiki (at least he seems to have created the page)
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/// </summary>
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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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#if NETFX_CORE && !UNITY_EDITOR
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//using MarkerMetro.Unity.WinLegacy.IO;
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#endif
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namespace Pathfinding {
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public class ObjImporter {
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private struct meshStruct {
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public Vector3[] vertices;
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public Vector3[] normals;
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public Vector2[] uv;
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public int[] triangles;
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public Vector3[] faceData;
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public string fileName;
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}
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// Use this for initialization
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public static Mesh ImportFile (string filePath) {
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#if NETFX_CORE
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throw new System.NotSupportedException("Method not available on this platform");
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#else
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if (!File.Exists(filePath)) {
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Debug.LogError("No file was found at '"+filePath+"'");
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return null;
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}
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meshStruct newMesh = createMeshStruct(filePath);
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populateMeshStruct(ref newMesh);
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Vector3[] newVerts = new Vector3[newMesh.faceData.Length];
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Vector2[] newUVs = new Vector2[newMesh.faceData.Length];
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Vector3[] newNormals = new Vector3[newMesh.faceData.Length];
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int i = 0;
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/* The following foreach loops through the facedata and assigns the appropriate vertex, uv, or normal
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* for the appropriate Unity mesh array.
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*/
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foreach (Vector3 v in newMesh.faceData) {
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newVerts[i] = newMesh.vertices[(int)v.x - 1];
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if (v.y >= 1)
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newUVs[i] = newMesh.uv[(int)v.y - 1];
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if (v.z >= 1)
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newNormals[i] = newMesh.normals[(int)v.z - 1];
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i++;
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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 = newMesh.triangles;
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mesh.RecalculateBounds();
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//mesh.Optimize();
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return mesh;
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#endif
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}
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private static meshStruct createMeshStruct (string filename) {
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#if NETFX_CORE
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throw new System.NotSupportedException("Method not available on this platform");
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#else
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int triangles = 0;
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int vertices = 0;
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int vt = 0;
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int vn = 0;
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int face = 0;
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meshStruct mesh = new meshStruct();
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mesh.fileName = filename;
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StreamReader stream = File.OpenText(filename);
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string entireText = stream.ReadToEnd();
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stream.Dispose();
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using (StringReader reader = new StringReader(entireText))
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{
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string currentText = reader.ReadLine();
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char[] splitIdentifier = { ' ' };
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string[] brokenString;
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while (currentText != null) {
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if (!currentText.StartsWith("f ") && !currentText.StartsWith("v ") && !currentText.StartsWith("vt ")
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&& !currentText.StartsWith("vn ")) {
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currentText = reader.ReadLine();
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if (currentText != null) {
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currentText = currentText.Replace(" ", " ");
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}
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} else {
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currentText = currentText.Trim(); //Trim the current line
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brokenString = currentText.Split(splitIdentifier, 50); //Split the line into an array, separating the original line by blank spaces
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switch (brokenString[0]) {
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case "v":
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vertices++;
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break;
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case "vt":
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vt++;
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break;
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case "vn":
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vn++;
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break;
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case "f":
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face = face + brokenString.Length - 1;
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triangles = triangles + 3 * (brokenString.Length - 2); /*brokenString.Length is 3 or greater since a face must have at least
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* 3 vertices. For each additional vertice, there is an additional
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* triangle in the mesh (hence this formula).*/
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break;
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}
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currentText = reader.ReadLine();
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if (currentText != null) {
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currentText = currentText.Replace(" ", " ");
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}
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}
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}
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}
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mesh.triangles = new int[triangles];
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mesh.vertices = new Vector3[vertices];
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mesh.uv = new Vector2[vt];
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mesh.normals = new Vector3[vn];
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mesh.faceData = new Vector3[face];
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return mesh;
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#endif
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}
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private static void populateMeshStruct (ref meshStruct mesh) {
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#if NETFX_CORE
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throw new System.NotSupportedException("Method not available on this platform");
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#else
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StreamReader stream = File.OpenText(mesh.fileName);
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string entireText = stream.ReadToEnd();
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stream.Close();
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using (StringReader reader = new StringReader(entireText))
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{
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string currentText = reader.ReadLine();
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char[] splitIdentifier = { ' ' };
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char[] splitIdentifier2 = { '/' };
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string[] brokenString;
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string[] brokenBrokenString;
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int f = 0;
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int f2 = 0;
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int v = 0;
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int vn = 0;
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int vt = 0;
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int vt1 = 0;
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int vt2 = 0;
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while (currentText != null) {
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if (!currentText.StartsWith("f ") && !currentText.StartsWith("v ") && !currentText.StartsWith("vt ") &&
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!currentText.StartsWith("vn ") && !currentText.StartsWith("g ") && !currentText.StartsWith("usemtl ") &&
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!currentText.StartsWith("mtllib ") && !currentText.StartsWith("vt1 ") && !currentText.StartsWith("vt2 ") &&
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!currentText.StartsWith("vc ") && !currentText.StartsWith("usemap ")) {
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currentText = reader.ReadLine();
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if (currentText != null) {
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currentText = currentText.Replace(" ", " ");
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}
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} else {
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currentText = currentText.Trim();
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brokenString = currentText.Split(splitIdentifier, 50);
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switch (brokenString[0]) {
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case "g":
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break;
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case "usemtl":
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break;
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case "usemap":
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break;
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case "mtllib":
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break;
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case "v":
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mesh.vertices[v] = new Vector3(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]),
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System.Convert.ToSingle(brokenString[3]));
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v++;
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break;
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case "vt":
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mesh.uv[vt] = new Vector2(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]));
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vt++;
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break;
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case "vt1":
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mesh.uv[vt1] = new Vector2(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]));
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vt1++;
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break;
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case "vt2":
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mesh.uv[vt2] = new Vector2(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]));
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vt2++;
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break;
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case "vn":
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mesh.normals[vn] = new Vector3(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]),
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System.Convert.ToSingle(brokenString[3]));
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vn++;
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break;
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case "vc":
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break;
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case "f":
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int j = 1;
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List<int> intArray = new List<int>();
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while (j < brokenString.Length && ("" + brokenString[j]).Length > 0) {
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Vector3 temp = new Vector3();
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brokenBrokenString = brokenString[j].Split(splitIdentifier2, 3); //Separate the face into individual components (vert, uv, normal)
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temp.x = System.Convert.ToInt32(brokenBrokenString[0]);
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if (brokenBrokenString.Length > 1) { //Some .obj files skip UV and normal
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if (brokenBrokenString[1] != "") { //Some .obj files skip the uv and not the normal
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temp.y = System.Convert.ToInt32(brokenBrokenString[1]);
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}
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temp.z = System.Convert.ToInt32(brokenBrokenString[2]);
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}
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j++;
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mesh.faceData[f2] = temp;
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intArray.Add(f2);
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f2++;
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}
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j = 1;
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while (j + 2 < brokenString.Length) { //Create triangles out of the face data. There will generally be more than 1 triangle per face.
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mesh.triangles[f] = intArray[0];
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f++;
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mesh.triangles[f] = intArray[j];
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f++;
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mesh.triangles[f] = intArray[j+1];
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f++;
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j++;
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}
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break;
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}
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currentText = reader.ReadLine();
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if (currentText != null) {
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currentText = currentText.Replace(" ", " "); //Some .obj files insert double spaces, this removes them.
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}
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}
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}
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}
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#endif
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}
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}
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}
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