public static void ParseMesh(IEnumerable <string> lines, ref MeshWrapper meshWrapper)
{
foreach (var line in lines)
{
ParseLine(line, ref meshWrapper);
}
}
public static Mesh LoadMeshFromFile(string fileName)
{
var lines = File.ReadLines(fileName);
var meshWrapper = new MeshWrapper {
Name = Path.GetFileNameWithoutExtension(fileName)
};
ObjFormatParser.ParseMesh(lines, ref meshWrapper);
var mesh = CreateMesh(meshWrapper);
mesh.RecalculateBounds();
mesh.Optimize();
return(mesh);
}
private static Mesh CreateMesh(MeshWrapper meshWrapper)
{
var vertices = new Vector3[meshWrapper.Faces.Count];
var uvs = new Vector2[meshWrapper.Faces.Count];
var normals = new Vector3[meshWrapper.Faces.Count];
var triangles = meshWrapper.Triangles.ToArray();
var meshName = meshWrapper.Name;
//
for (var i = 0; i < meshWrapper.Faces.Count; i++)
{
if (meshWrapper.Faces[i].x >= 1)
{
vertices[i] = meshWrapper.Vertices[meshWrapper.Faces[i].x - 1];
}
if (meshWrapper.Faces[i].y >= 1)
{
uvs[i] = meshWrapper.UVs[meshWrapper.Faces[i].y - 1];
}
if (meshWrapper.Faces[i].z >= 1)
{
normals[i] = meshWrapper.Normals[meshWrapper.Faces[i].z - 1];
}
}
var mesh = new Mesh
{
name = meshName,
vertices = vertices,
uv = uvs,
normals = normals,
triangles = triangles
};
return(mesh);
}
private static void ParseLine(string line, ref MeshWrapper meshWrapper)
{
var args = line.Split(' ');
switch (args[0])
{
case "v": // vertex
meshWrapper.Vertices.Add(ParseVector3Args(args));
break;
case "vt": // uv
meshWrapper.UVs.Add(ParseVector3Args(args, true));
break;
case "vn": // normal
meshWrapper.Normals.Add(ParseVector3Args(args));
break;
case "f": // face
var faceBlocks = ParseFaceArgs(args);
// calculating triangles
meshWrapper.GlobalFaceBlockIndex += faceBlocks.Count;
for (var i = meshWrapper.GlobalFaceBlockIndex - faceBlocks.Count + 1;
i + 1 < meshWrapper.GlobalFaceBlockIndex;
i++)
{
meshWrapper.Triangles.Add(meshWrapper.GlobalFaceBlockIndex - faceBlocks.Count);
meshWrapper.Triangles.Add(i);
meshWrapper.Triangles.Add(i + 1);
}
meshWrapper.Faces.AddRange(faceBlocks);
break;
}
}
