public static Solid SolidFromMesh(Mesh model)
{
var solid = new Solid();
List <Vector3> vertices = new List <Vector3>();
List <int> indices = new List <int>();
int nextIndex = 0;
foreach (Face face in model.Faces)
{
List <IVertex> triangle = new List <IVertex>();
VectorMath.Vector3 first = VectorMath.Vector3.Zero;
VectorMath.Vector3 last = VectorMath.Vector3.Zero;
bool isFirst = true;
int count = 0;
foreach (FaceEdge faceEdge in face.FaceEdges())
{
VectorMath.Vector3 position = faceEdge.FirstVertex.Position;
if (isFirst)
{
first = position;
isFirst = false;
}
if (count < 3)
{
vertices.Add(new Vector3(position.X, position.Y, position.Z));
indices.Add(nextIndex++);
}
else // add an entire new polygon
{
vertices.Add(new Vector3(first.X, first.Y, first.Z));
indices.Add(nextIndex++);
vertices.Add(new Vector3(last.X, last.Y, last.Z));
indices.Add(nextIndex++);
vertices.Add(new Vector3(position.X, position.Y, position.Z));
indices.Add(nextIndex++);
}
count++;
last = position;
}
}
solid.setData(vertices.ToArray(), indices.ToArray());
return(solid);
}
private static bool loadModelSTL_binary(SimpleMeshCollection simpleModel, string filename, Matrix4X4 matrix)
{
var vol = new SimpleMesh();
using (FileStream stlStream = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
// load it as a binary stl
// skip the first 80 bytes
// read in the number of triangles
stlStream.Position = 0;
var br = new BinaryReader(stlStream);
byte[] fileContents = br.ReadBytes((int)stlStream.Length);
int currentPosition = 80;
if (fileContents.Length < currentPosition)
{
return(false);
}
uint numTriangles = BitConverter.ToUInt32(fileContents, currentPosition);
long bytesForNormals = numTriangles * 3 * 4;
long bytesForVertices = numTriangles * 3 * 4;
long bytesForAttributs = numTriangles * 2;
currentPosition += 4;
long numBytesRequiredForVertexData = currentPosition + bytesForNormals + bytesForVertices + bytesForAttributs;
if (fileContents.Length < numBytesRequiredForVertexData || numTriangles < 0)
{
stlStream.Close();
return(false);
}
var vector = new IntPoint[3];
for (int i = 0; i < numTriangles; i++)
{
// skip the normal
currentPosition += 3 * 4;
for (int j = 0; j < 3; j++)
{
var vertex = new VectorMath.Vector3(
BitConverter.ToSingle(fileContents, currentPosition + 0 * 4),
BitConverter.ToSingle(fileContents, currentPosition + 1 * 4),
BitConverter.ToSingle(fileContents, currentPosition + 2 * 4));
var new0 = Vector3Ex.Transform(vertex, matrix);
vector[j] = new IntPoint(new0.X * 1000, new0.Y * 1000, new0.Z * 1000);
currentPosition += 3 * 4;
}
currentPosition += 2; // skip the attribute
vol.AddFaceTriangle(vector[2], vector[1], vector[0]);
}
}
// Detect and skip non-visible mesh
var bounds = vol.MaxXYZ_um() - vol.MinXYZ_um();
if (vol.FaceTriangles.Count > 0)
{
if (bounds.X == 0)
{
vol.FaceTriangles = new List <SimpleMesh.SimpleFace>();
}
simpleModel.SimpleMeshes.Add(vol);
return(true);
}
return(false);
}