// Use this for initialization
public Mesh ImportFile(string filePath)
{
tempMesh newMesh = createTemp(filePath);
populateTempMesh(ref newMesh);
Vector3[] newVertices = 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.
*/
foreach (Vector3 v in newMesh.faceData)
{
newVertices[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 = newVertices;
mesh.uv = newUVs;
mesh.normals = newNormals;
mesh.triangles = newMesh.triangles;
mesh.RecalculateBounds();
;
return(mesh);
}
private static tempMesh createTemp(string filename)
{
int triangles = 0;
int vertices = 0;
int vt = 0;
int vn = 0;
int face = 0;
tempMesh mesh = new tempMesh();
mesh.fileName = filename;
StreamReader stream = File.OpenText(filename);
string entireText = stream.ReadToEnd();
stream.Close();
using (StringReader reader = new StringReader(entireText))
{
string currentText = reader.ReadLine();
char[] splitIdentifier = { ' ' };
string[] splitString;
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
splitString = currentText.Split(splitIdentifier, 50); //Split the line into an array
switch (splitString[0])
{
case "v":
vertices++;
break;
case "vt":
vt++;
break;
case "vn":
vn++;
break;
case "f":
face = face + splitString.Length - 1;
triangles = triangles + 3 * (splitString.Length - 2); /* Length is 3 or more, representing one triangle. each additional vertice, there is a new
* triangle*/
break;
}
currentText = reader.ReadLine();
if (currentText != null)
{
currentText = currentText.Replace(" ", " ");
}
}
}
}
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];
return(mesh);
}
private static void populateTempMesh(ref tempMesh mesh)
{
StreamReader stream = File.OpenText(mesh.fileName);
string entireText = stream.ReadToEnd();
stream.Close();
using (StringReader reader = new StringReader(entireText))
{
string currentText = reader.ReadLine();
char[] splitIdentifier = { ' ' };
char[] splitIdentifier2 = { '/' };
string[] splitString;
string[] twiceSplitString;
int f = 0;
int f2 = 0;
int v = 0;
int vn = 0;
int vt = 0;
int vt1 = 0;
int vt2 = 0;
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();
splitString = currentText.Split(splitIdentifier, 50);
switch (splitString[0])
{
case "g":
break;
case "usemtl":
break;
case "usemap":
break;
case "mtllib":
break;
case "v":
mesh.vertices[v] = new Vector3(System.Convert.ToSingle(splitString[1]), System.Convert.ToSingle(splitString[2]),
System.Convert.ToSingle(splitString[3]));
v++;
break;
case "vt":
mesh.uv[vt] = new Vector2(System.Convert.ToSingle(splitString[1]), System.Convert.ToSingle(splitString[2]));
vt++;
break;
case "vt1":
mesh.uv[vt1] = new Vector2(System.Convert.ToSingle(splitString[1]), System.Convert.ToSingle(splitString[2]));
vt1++;
break;
case "vt2":
mesh.uv[vt2] = new Vector2(System.Convert.ToSingle(splitString[1]), System.Convert.ToSingle(splitString[2]));
vt2++;
break;
case "vn":
mesh.normals[vn] = new Vector3(System.Convert.ToSingle(splitString[1]), System.Convert.ToSingle(splitString[2]),
System.Convert.ToSingle(splitString[3]));
vn++;
break;
case "vc":
break;
case "f":
int j = 1;
List <int> intArray = new List <int>();
while (j < splitString.Length && ("" + splitString[j]).Length > 0)
{
Vector3 temp = new Vector3();
twiceSplitString = splitString[j].Split(splitIdentifier2, 3); //Separate the face into parts
temp.x = System.Convert.ToInt32(twiceSplitString[0]);
if (twiceSplitString.Length > 1) //Some files skip UV and normal
{
if (twiceSplitString[1] != "") //Some files skip the uv but not the normal
{
temp.y = System.Convert.ToInt32(twiceSplitString[1]);
}
temp.z = System.Convert.ToInt32(twiceSplitString[2]);
}
j++;
mesh.faceData[f2] = temp;
intArray.Add(f2);
f2++;
}
j = 1;
while (j + 2 < splitString.Length) //Create triangles out of the face data
{
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
}
}
}
}
}
