这是将objs导入我的团结的代码。
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
public class ObjImporter : MonoBehaviour {
public GameObject spawnPoint;
public GameObject emptyPrefabWithMeshRenderer;
public string meshPath;
public GameObject spawnedPrefab;
static float progressPercentageMin;
static float progressPercentageMax;
static float progressPercentage;
public Texture2D barBG;
public Texture2D barLoad;
int noOfLines;
void Start ()
{
progressPercentageMin = 0;
progressPercentageMax = 0;
progressPercentage = 0;
}
void Update ()
{
progressPercentage = Mathf.Lerp (progressPercentageMin, progressPercentageMax, Time.time * progressPercentageMax * 0.01f);
if(Input.GetKeyDown("space")){
Mesh importedMesh = GetComponent<ObjImporter>().ImportFile(meshPath);
noOfLines = TotalLines(meshPath);
spawnedPrefab=Instantiate(emptyPrefabWithMeshRenderer,spawnPoint.transform.position,spawnPoint.transform.rotation) as GameObject;
spawnedPrefab.GetComponent<MeshFilter>().mesh=importedMesh;
spawnedPrefab.GetComponent<Renderer>().material.color = new Color(Random.value, Random.value, Random.value, 1.0f);
}
}
public static void UpdateProgressBar()
{
progressPercentageMax += 10;
}
private struct meshStruct
{
public Vector3[] vertices;
public Vector3[] normals;
public Vector2[] uv;
public Vector2[] uv1;
public Vector2[] uv2;
public int[] triangles;
public int[] faceVerts;
public int[] faceUVs;
public Vector3[] faceData;
public string name;
public string fileName;
}
// Use this for initialization
public Mesh ImportFile (string filePath){
meshStruct newMesh = createMeshStruct(filePath);
populateMeshStruct(ref newMesh);
UpdateProgressBar();
Vector3[] newVerts = new Vector3[newMesh.faceData.Length];
Vector2[] newUVs = new Vector2[newMesh.faceData.Length];
Vector3[] newNormals = new Vector3[newMesh.faceData.Length];
int i = 0;
/* The following foreach loops through the facedata and assigns the appropriate vertex, uv, or normal
* for the appropriate Unity mesh array.
*/
UpdateProgressBar();
foreach (Vector3 v in newMesh.faceData)
{
newVerts[i] = newMesh.vertices[(int)v.x - 1];
if (v.y >= 1)
newUVs[i] = newMesh.uv[(int)v.y - 1];
if (v.z >= 1)
newNormals[i] = newMesh.normals[(int)v.z - 1];
i++;
}
Mesh mesh = new Mesh();
mesh.vertices = newVerts;
mesh.uv = newUVs;
mesh.normals = newNormals;
mesh.triangles = newMesh.triangles;
mesh.RecalculateBounds();
mesh.Optimize ();
UpdateProgressBar();
return mesh;
}
private int TotalLines(string filePath)
{
using (StreamReader r = new StreamReader(filePath))
{
int i = 0;
while (r.ReadLine() != null)
{
i++;
}
return i;
}
}
private static meshStruct createMeshStruct(string filename)
{
int triangles = 0;
int vertices = 0;
int vt = 0;
int vn = 0;
int face = 0;
meshStruct mesh = new meshStruct();
mesh.fileName = filename;
// Read and retrieve all the text in the file.
StreamReader stream = File.OpenText(filename);
string entireText = stream.ReadToEnd();
stream.Close(); // End of stream.
UpdateProgressBar();
// Going through the retrieved text.
using (StringReader reader = new StringReader(entireText))
{
string currentText = reader.ReadLine();
char[] splitIdentifier = { ' ' };
string[] brokenString;
UpdateProgressBar();
while (currentText != null)
{
if (!currentText.StartsWith("f ") && !currentText.StartsWith("v ") && !currentText.StartsWith("vt ")
&& !currentText.StartsWith("vn "))
{
currentText = reader.ReadLine();
if (currentText != null)
{
currentText = currentText.Replace(" ", " ");
}
}
else
{
currentText = currentText.Trim(); // Trim the current line
brokenString = currentText.Split(splitIdentifier, 50); // Split the line into an array, separating the original line by blank spaces
switch (brokenString[0])
{
case "v":
vertices++;
break;
case "vt":
vt++;
break;
case "vn":
vn++;
break;
case "f":
face = face + brokenString.Length - 1;
triangles = triangles + 3 * (brokenString.Length - 2); /*brokenString.Length is 3 or greater since a face must have at least
3 vertices. For each additional vertice, there is an additional
triangle in the mesh (hence this formula).*/
break;
}
currentText = reader.ReadLine();
if (currentText != null)
{
currentText = currentText.Replace(" ", " ");
}
}
}
UpdateProgressBar();
}
mesh.triangles = new int[triangles];
mesh.vertices = new Vector3[vertices];
mesh.uv = new Vector2[vt];
mesh.normals = new Vector3[vn];
mesh.faceData = new Vector3[face];
UpdateProgressBar();
return mesh;
}
private static void populateMeshStruct(ref meshStruct mesh)
{
StreamReader stream = File.OpenText(mesh.fileName);
string entireText = stream.ReadToEnd();
stream.Close();
UpdateProgressBar();
using (StringReader reader = new StringReader(entireText))
{
string currentText = reader.ReadLine();
char[] splitIdentifier = { ' ' };
char[] splitIdentifier2 = { '/' };
string[] brokenString;
string[] brokenBrokenString;
int f = 0;
int f2 = 0;
int v = 0;
int vn = 0;
int vt = 0;
int vt1 = 0;
int vt2 = 0;
UpdateProgressBar();
while (currentText != null)
{
if (!currentText.StartsWith("f ") && !currentText.StartsWith("v ") && !currentText.StartsWith("vt ") &&
!currentText.StartsWith("vn ") && !currentText.StartsWith("g ") && !currentText.StartsWith("usemtl ") &&
!currentText.StartsWith("mtllib ") && !currentText.StartsWith("vt1 ") && !currentText.StartsWith("vt2 ") &&
!currentText.StartsWith("vc ") && !currentText.StartsWith("usemap "))
{
currentText = reader.ReadLine();
if (currentText != null)
{
currentText = currentText.Replace(" ", " ");
}
}
else
{
currentText = currentText.Trim();
brokenString = currentText.Split(splitIdentifier, 50);
switch (brokenString[0])
{
case "g":
break;
case "usemtl":
break;
case "usemap":
break;
case "mtllib":
break;
//
case "v":
mesh.vertices[v] = new Vector3(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]),
System.Convert.ToSingle(brokenString[3]));
v++;
break;
case "vt":
mesh.uv[vt] = new Vector2(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]));
vt++;
break;
case "vt1":
mesh.uv[vt1] = new Vector2(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]));
vt1++;
break;
case "vt2":
mesh.uv[vt2] = new Vector2(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]));
vt2++;
break;
case "vn":
mesh.normals[vn] = new Vector3(System.Convert.ToSingle(brokenString[1]), System.Convert.ToSingle(brokenString[2]),
System.Convert.ToSingle(brokenString[3]));
vn++;
break;
case "vc":
break;
case "f":
int j = 1;
List<int> intArray = new List<int>();
while (j < brokenString.Length && ("" + brokenString[j]).Length > 0)
{
Vector3 temp = new Vector3();
brokenBrokenString = brokenString[j].Split(splitIdentifier2, 3); //Separate the face into individual components (vert, uv, normal)
temp.x = System.Convert.ToInt32(brokenBrokenString[0]);
if (brokenBrokenString.Length > 1) //Some .obj files skip UV and normal
{
if (brokenBrokenString[1] != "") //Some .obj files skip the uv and not the normal
{
temp.y = System.Convert.ToInt32(brokenBrokenString[1]);
}
temp.z = System.Convert.ToInt32(brokenBrokenString[2]);
}
j++;
mesh.faceData[f2] = temp;
intArray.Add(f2);
f2++;
}
j = 1;
while (j + 2 < brokenString.Length) //Create triangles out of the face data. There will generally be more than 1 triangle per face.
{
mesh.triangles[f] = intArray[0];
f++;
mesh.triangles[f] = intArray[j];
f++;
mesh.triangles[f] = intArray[j+1];
f++;
j++;
}
break;
}
currentText = reader.ReadLine();
if (currentText != null)
{
currentText = currentText.Replace(" ", " "); //Some .obj files insert double spaces, this removes them.
}
}
}
}
UpdateProgressBar();
}
void OnGUI()
{
//GUI.Label (new Rect (20, 20, 100, 100), progressPercentage.ToString());
GUI.DrawTexture(new Rect(100, 100, 100, 20), barBG);
GUI.DrawTexture(new Rect(100, 100, progressPercentage, 20), barLoad);
}
}
加载模型时，进度条应该可以顺利运行。 但是，Unity由于加载了模式而挂起，你实际上无法看到条形图的进度。 任何人都知道如何延迟绘制进度条以便看到它。
答案 0 :(得分：0)
Unity挂起的原因是Unity（大部分）在单个线程上运行，这意味着Update中的ImportFile函数将在下一行代码被调用之前完全完成，这将阻止OnGUI函数被调用直到整个更新功能已完成。
解决这个问题的唯一方法是使用MultiThreading，因为您无法访问主线程之外的任何Unity数据，因此在Unity中很难实现，因此您只能访问自己的数据在另一个线程中。
https://web.archive.org/web/20140702033426/http://unitygems.com/threads/
看起来原始网站已关闭，但这对我来说非常好地解释了Unity中的线程并附带了一些示例代码和用例