public override byte[] Write(Shape shape)
{
var stlShape = StlHelper.ToStlShape(shape);
using var stream = new MemoryStream();
using var writer = new BinaryWriter(stream);
byte[] header = new byte[80];
uint triangleCount = (uint)stlShape.Triangles.Length;
writer.Write(header);
writer.Write(triangleCount);
foreach (var triangle in stlShape.Triangles)
{
writer.Write(triangle.Normal.X);
writer.Write(triangle.Normal.Y);
writer.Write(triangle.Normal.Z);
foreach (var position in triangle.Positions)
{
writer.Write(position.X);
writer.Write(position.Y);
writer.Write(position.Z);
}
writer.Write(triangle.Attribute);
}
return(stream.ToArray());
}
public override byte[] Write(Shape shape)
{
var stlShape = StlHelper.ToStlShape(shape);
var sb = new StringBuilder();
sb.AppendLine($"solid {stlShape.Name}");
foreach (var triangle in stlShape.Triangles)
{
sb.AppendLine("\tfacet normal " + Ascii_Vector3Format(triangle.Normal));
sb.AppendLine("\t\touter loop");
foreach (var position in triangle.Positions)
{
sb.AppendLine("\t\t\tvertex " + Ascii_Vector3Format(position));
}
sb.AppendLine("\t\tendloop");
sb.AppendLine("\tendfacet");
}
sb.AppendLine("endsolid");
return(Encoding.ASCII.GetBytes(sb.ToString()));
}
public override Shape Read(MemoryStream stream)
{
using var reader = new BinaryReader(stream);
byte[] header = reader.ReadBytes(80);
uint triangleCount = reader.ReadUInt32();
var triangles = new List <StlTriangle>();
for (int i = 0; i < triangleCount; i++)
{
var normalX = reader.ReadSingle();
var normalY = reader.ReadSingle();
var normalZ = reader.ReadSingle();
var v1X = reader.ReadSingle();
var v1Y = reader.ReadSingle();
var v1Z = reader.ReadSingle();
var v2X = reader.ReadSingle();
var v2Y = reader.ReadSingle();
var v2Z = reader.ReadSingle();
var v3X = reader.ReadSingle();
var v3Y = reader.ReadSingle();
var v3Z = reader.ReadSingle();
var attribute = reader.ReadUInt16();
triangles.Add(new StlTriangle(
new Vector3(normalX, normalY, normalZ),
new Vector3[]
{
new Vector3(v1X, v1Y, v1Z),
new Vector3(v2X, v2Y, v2Z),
new Vector3(v3X, v3Y, v3Z)
},
attribute
));
}
var stlShape = new StlShape(string.Empty, triangles.ToArray());
return(StlHelper.ToShape(stlShape));
}