public ObjModel(String filename)
{
String contents = File.ReadAllText(filename);
v = new List <Vector3>();
vn = new List <Vector3>();
vt = new List <Vector3>();
f = new List <Indexes>();
c = new List <VColor>();
List <VColor> colors = new List <VColor>();
buffer = new List <byte>();
contents = Regex.Replace(contents, @" +", " "); // replace multiple spaces with one
// PARSE
string[] lines = contents.Split('\n').ToList().Select(m => m.Trim()).ToArray();
VColor color = new VColor();
foreach (string line in lines)
{
if (String.IsNullOrEmpty(line))
{
continue;
}
if (line.StartsWith("#"))
{
continue;
}
if (line.StartsWith("usemtl"))
{
color = new VColor();
if (line == "usemtl default")
{
continue;
}
if (line.StartsWith("usemtl Color.") && line.Contains(","))
{
string[] colorParts = line.Split('.');
string[] colorFractions = colorParts[1].Split(',');
color.r = byte.Parse(colorFractions[0]);
color.g = byte.Parse(colorFractions[1]);
color.b = byte.Parse(colorFractions[2]);
color.a = byte.Parse(colorFractions[3]);
}
else
{
color = new VColor {
r = 0, g = 0, b = 0, a = 255
}
};
colors.Add(color);
continue;
}
string[] parts = line.Split(' ');
switch (parts[0])
{
case "v":
case "vn":
case "vt":
Vector3 aux = new Vector3()
{
x = float.Parse(parts[1]),
y = float.Parse(parts[2]),
z = parts.Length > 3 ? float.Parse(parts[3]) : 0
};
switch (parts[0])
{
case "v": v.Add(aux); break;
case "vn": vn.Add(aux); break;
case "vt":
vt.Add(aux);
break;
}
break;
case "f":
Indexes index = new Indexes();
for (int h = 1; h <= 3; h++)
{
string[] subparts = parts[h].Split('/').ToArray();
Vector3UShort auxf = new Vector3UShort()
{
x = ushort.Parse(subparts[0]),
y = subparts.Length < 2 || subparts[1].Length == 0 ? (ushort)0 : ushort.Parse(subparts[1]),
z = subparts.Length < 3 || subparts[2].Length == 0 ? (ushort)0 : ushort.Parse(subparts[2])
};
index.positions[h - 1] = auxf;
}
f.Add(index);
c.Add(color);
break;
}
}
// reorder
List <Vector3> vertices = new List <Vector3>();
List <Vector3> uvs = new List <Vector3>();
List <Vector3> normals = new List <Vector3>();
float texturePosModifier = (1.0f / colors.Count);
int materialIndex = 0;
int keyIndex = 0;
Vector3 vaux;
foreach (Indexes index in f)
{
foreach (Vector3UShort part in index.positions)
{
vertices.Add(v[part.x - 1]);
if (vt.Count > 0)
{
vaux = new Vector3()
{
x = vt[part.y - 1].x, y = 1 - vt[part.y - 1].y, z = vt[part.y - 1].z
};
if (colors.Count > 1)
{
materialIndex = colors.IndexOf(c[keyIndex]);
//vaux.x = vaux.x * texturePosModifier / 100.0f + materialIndex * texturePosModifier + (vaux.x == 1.0f ? 0.0f : .01f);
vaux.y = .5f;
vaux.z = 0;
vaux.x = texturePosModifier * materialIndex + texturePosModifier / 2;
}
uvs.Add(vaux);
}
if (vn.Count > 0)
{
normals.Add(vn[part.z - 1]);
}
}
keyIndex++;
}
// WRITE TO BUFFER
buffer.AddRange(BitConverter.GetBytes((ushort)vertices.Count));
foreach (Vector3 vector in vertices)
{
AddVector(vector);
}
if (vertices.Count > 0)
{
Vector3 min, max, size;
min = new Vector3()
{
x = vertices.Min(m => m.x),
y = vertices.Min(m => m.y),
z = vertices.Min(m => m.z)
};
max = new Vector3()
{
x = vertices.Max(m => m.x),
y = vertices.Max(m => m.y),
z = vertices.Max(m => m.z)
};
size = new Vector3()
{
x = Math.Abs(max.x - min.x),
y = Math.Abs(max.y - min.y),
z = Math.Abs(max.z - min.z)
};
AddVector(size);
}
buffer.AddRange(BitConverter.GetBytes((ushort)uvs.Count));
foreach (Vector3 vector in uvs)
{
AddVector(vector);
}
buffer.AddRange(BitConverter.GetBytes((ushort)normals.Count));
foreach (Vector3 vector in normals)
{
AddVector(vector);
}
buffer.AddRange(BitConverter.GetBytes((ushort)colors.Count));
foreach (VColor c in colors)
{
AddVector(c);
}
}