public IList <Mesh> Parse()
{
var materials = ParseMaterials(_mtlFile);
var result = new List <Mesh>();
var objFileRows = Regex.Split(_objFile, "\r\n|\r|\n");
MeshBuilder meshBuilder = null;
foreach (var objFileRow in objFileRows)
{
var columns = objFileRow.Split(' ');
if (columns.Length == 0)
{
continue;
}
var firstColumn = columns.First();
if (firstColumn == "#")
{
continue;
}
if (firstColumn == "o")
{
if (meshBuilder != null)
{
result.Add(meshBuilder.Build());
}
meshBuilder = new MeshBuilder();
if (columns.Length >= 2)
{
meshBuilder.Name = columns[1];
}
//result.Add(currentSceneObject);
}
if (firstColumn == "v")
{
if (meshBuilder == null)
{
throw new Exception("'v' before 'o' error");
}
if (columns.Length != 4)
{
throw new Exception("Must be 4 columns for Vertex row");
}
var x = ParseHelper.ParseFloat(columns[1]);
var y = ParseHelper.ParseFloat(columns[2]);
var z = ParseHelper.ParseFloat(columns[3]);
meshBuilder.Vertices.Add(new Vector3(x, y, z));
}
if (firstColumn == "f")
{
if (meshBuilder == null)
{
throw new Exception("'f' before 'o' error");
}
if (columns.Length != 4)
{
throw new Exception("Must be 4 columns for Face row");
}
for (int iFace = 0; iFace < 3; iFace++)
{
var faceColumns = columns[iFace + 1].Split('/');
var i = uint.Parse(faceColumns[0]) - 1;
meshBuilder.Indices.Add(i);
}
}
if (firstColumn == "usemtl")
{
if (meshBuilder == null)
{
throw new Exception("'usemtl' before 'o' error");
}
if (columns.Length != 2)
{
throw new Exception("'usemtl' missing name");
}
meshBuilder.Material = materials.Single(x => x.Name == columns[1]);
}
}
if (meshBuilder != null)
{
result.Add(meshBuilder.Build());
}
return(result);
}
private static IList <Material> ParseMaterials(string mtlFile)
{
var mtlFileRows = Regex.Split(mtlFile, "\r\n|\r|\n");
var result = new List <Material>();
Material material = null;
foreach (var mtlFileRow in mtlFileRows)
{
var columns = mtlFileRow.Split(' ');
if (columns.Length == 0)
{
continue;
}
var firstColumn = columns.First();
if (firstColumn == "#")
{
continue;
}
if (firstColumn == "newmtl")
{
if (material != null)
{
result.Add(material);
}
if (columns.Length != 2)
{
throw new Exception("newmtl missing name");
}
material = new Material
{
Name = columns[1]
};
}
if (firstColumn == "Kd")
{
if (material == null)
{
throw new Exception("'Kd' before 'newmtl' error");
}
if (columns.Length != 4)
{
throw new Exception("'Kd' must have 3 floats");
}
var r = ParseHelper.ParseFloat(columns[1]);
var g = ParseHelper.ParseFloat(columns[2]);
var b = ParseHelper.ParseFloat(columns[3]);
material.Diffuse = new Vector3(r, g, b);
}
}
if (material != null)
{
result.Add(material);
}
return(result);
}
