public Vertex(Float3 position)
{
this.position = position;
this.normal = Float3.zero;
this.color = Color.Black;
this.uv = new Float2(0, 0);
}
public IVertex(Vertex v)
{
this.position = (Int3)v.position;
this.normal = v.normal;
this.color = v.color;
this.uv = v.uv;
}
public static Float2 lerp(Float2 start, Float2 end, float delta)
{
return start + (end - start) * delta;
}
public static Mesh ReadMeshFromFile(string filePath)
{
Mesh result = new Mesh();
string[] lines = File.ReadAllLines(filePath);
List<Float3> normals = new List<Float3>();
List<Float3> vPositions = new List<Float3>();
List<Float2> uvs = new List<Float2>();
List<WObjTriangle> wTriangles = new List<WObjTriangle>();
for (int i = 0; i < lines.Length; i++)
{
if (lines[i].Length == 0)
continue;
string[] lineParts = ReplaceMultipleSpaces(lines[i]).Split(' ');
// vertex positions
if (lineParts[0] == "v")
{
Float3 position = new Float3(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture)
);
vPositions.Add(position);
}
// uv coordinates
if (lineParts[0] == "vt")
{
Float2 uv = new Float2(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture));
uvs.Add(uv);
}
// normals
if (lineParts[0] == "vn")
{
Float3 normal = new Float3(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture)
);
normals.Add(normal);
}
if (lineParts[0] == "f")
{
string[] f1 = lineParts[1].Split('/');
string[] f2 = lineParts[2].Split('/');
string[] f3 = lineParts[3].Split('/');
int v1 = int.Parse(f1[0]);
int v2 = int.Parse(f2[0]);
int v3 = int.Parse(f3[0]);
int t1 = -1;
int t2 = -1;
int t3 = -1;
// if texture coordinates specified
if (f1.Length > 1)
{
if (!string.IsNullOrEmpty(f1[1]))
t1 = int.Parse(f1[1]);
if (!string.IsNullOrEmpty(f2[1]))
t2 = int.Parse(f2[1]);
if (!string.IsNullOrEmpty(f3[1]))
t3 = int.Parse(f3[1]);
}
int n1 = 0, n2 = 0, n3 = 0;
// if normals specified
if (f1.Length > 2) {
n1 = int.Parse(f1[2]);
n2 = int.Parse(f2[2]);
n3 = int.Parse(f3[2]);
}
wTriangles.Add(new WObjTriangle(v1, v2, v3, n1, n2, n3, t1, t2, t3));
result.Triangles.Add(new Triangle(v1, v2, v3));
}
}
result.Vertices = new List<Vertex>();
for(int i = 0; i < vPositions.Count; i++)
{
result.Vertices.Add(new Vertex(vPositions[i]));
}
for(int i = 0; i < wTriangles.Count; i++)
{
WObjTriangle wTriangle = wTriangles[i];
Vertex v1 = result.Vertices[wTriangle.v1 - 1];
Vertex v2 = result.Vertices[wTriangle.v2 - 1];
Vertex v3 = result.Vertices[wTriangle.v3 - 1];
if(normals.Count > 0)
{
v1.normal = normals[wTriangle.n1 - 1];
v2.normal = normals[wTriangle.n2 - 1];
v3.normal = normals[wTriangle.n3 - 1];
}
if (uvs.Count > 0)
{
if (wTriangle.uv1 < 0 || wTriangle.uv2 < 0 || wTriangle.uv3 < 0)
continue;
v1.uv = uvs[wTriangle.uv1 - 1];
v2.uv = uvs[wTriangle.uv2 - 1];
v3.uv = uvs[wTriangle.uv3 - 1];
}
}
return result;
}