/// <summary>
/// Save mesh in binary .STL file
/// </summary>
/// <param name="mesh">Calculated mesh object</param>
/// <param name="writer">Binary file writer</param>
/// <param name="flipYZ">Flag to determine whether the Y and Z values are flipped on save</param>
private static void SaveBinarySTLMesh( Mesh mesh, BinaryWriter writer, bool flipYZ = true )
{
var vertices = mesh.GetVertices();
var normals = mesh.GetNormals();
var indices = mesh.GetTriangleIndexes();
// Check mesh arguments
if ( 0 == vertices.Count || 0 != vertices.Count % 3 || vertices.Count != indices.Count ) {
throw new ArgumentException( "不正なメッシュです" );
}
char[] header = new char[80];
writer.Write( header );
// Write number of triangles
int triangles = vertices.Count / 3;
writer.Write( triangles );
// Sequentially write the normal, 3 vertices of the triangle and attribute, for each triangle
for ( int i = 0; i < triangles; i++ ) {
// Write normal
var normal = normals[i * 3];
writer.Write( normal.X );
writer.Write( flipYZ ? -normal.Y : normal.Y );
writer.Write( flipYZ ? -normal.Z : normal.Z );
// Write vertices
for ( int j = 0; j < 3; j++ ) {
var vertex = vertices[(i * 3) + j];
writer.Write( vertex.X );
writer.Write( flipYZ ? -vertex.Y : vertex.Y );
writer.Write( flipYZ ? -vertex.Z : vertex.Z );
}
ushort attribute = 0;
writer.Write( attribute );
}
}
/// <summary>
/// Save mesh in ASCII Wavefront .OBJ file
/// </summary>
/// <param name="mesh">Calculated mesh object</param>
/// <param name="writer">Stream writer</param>
/// <param name="flipYZ">Flag to determine whether the Y and Z values are flipped on save</param>
private static void SaveAsciiObjMesh( Mesh mesh, StreamWriter writer, bool flipYZ = true )
{
var vertices = mesh.GetVertices();
var normals = mesh.GetNormals();
var indices = mesh.GetTriangleIndexes();
// Check mesh arguments
if ( 0 == vertices.Count || 0 != vertices.Count % 3 || vertices.Count != indices.Count ) {
throw new ArgumentException( "不正なメッシュです" );
}
// Write the header lines
writer.WriteLine( "#" );
writer.WriteLine( "# OBJ file created by Microsoft Kinect Fusion" );
writer.WriteLine( "#" );
// Sequentially write the 3 vertices of the triangle, for each triangle
for ( int i = 0; i < vertices.Count; i++ ) {
var vertex = vertices[i];
string vertexString = "v " + vertex.X.ToString( CultureInfo.CurrentCulture ) + " ";
if ( flipYZ ) {
vertexString += (-vertex.Y).ToString( CultureInfo.CurrentCulture ) + " " + (-vertex.Z).ToString( CultureInfo.CurrentCulture );
}
else {
vertexString += vertex.Y.ToString( CultureInfo.CurrentCulture ) + " " + vertex.Z.ToString( CultureInfo.CurrentCulture );
}
writer.WriteLine( vertexString );
}
// Sequentially write the 3 normals of the triangle, for each triangle
for ( int i = 0; i < normals.Count; i++ ) {
var normal = normals[i];
string normalString = "vn " + normal.X.ToString( CultureInfo.CurrentCulture ) + " ";
if ( flipYZ ) {
normalString += (-normal.Y).ToString( CultureInfo.CurrentCulture ) + " " + (-normal.Z).ToString( CultureInfo.CurrentCulture );
}
else {
normalString += normal.Y.ToString( CultureInfo.CurrentCulture ) + " " + normal.Z.ToString( CultureInfo.CurrentCulture );
}
writer.WriteLine( normalString );
}
// Sequentially write the 3 vertex indices of the triangle face, for each triangle
// Note this is typically 1-indexed in an OBJ file when using absolute referencing!
for ( int i = 0; i < vertices.Count / 3; i++ ) {
string baseIndex0 = ((i * 3) + 1).ToString( CultureInfo.CurrentCulture );
string baseIndex1 = ((i * 3) + 2).ToString( CultureInfo.CurrentCulture );
string baseIndex2 = ((i * 3) + 3).ToString( CultureInfo.CurrentCulture );
string faceString = "f " + baseIndex0 + "//" + baseIndex0 + " " + baseIndex1 + "//" + baseIndex1 + " " + baseIndex2 + "//" + baseIndex2;
writer.WriteLine( faceString );
}
}
