public static Mesh GetMesh()
{
if (sm_mesh != null)
{
return(new Mesh(sm_mesh));
}
Mesh m = new Mesh();
m.Indeces.Clear();
m.Verteces.Clear();
for (int i = 0; i < 6; i++)
{
var vert = new VertexPositionNormalTexture();
vert.Position = __vertexPositions[i * 4 + 0];
vert.Uv = new Vector2(1, 1);
m.Verteces.Add(vert);
vert.Position = __vertexPositions[i * 4 + 1];
vert.Uv = new Vector2(1, 0);
m.Verteces.Add(vert);
vert.Position = __vertexPositions[i * 4 + 2];
vert.Uv = new Vector2(0, 0);
m.Verteces.Add(vert);
vert.Position = __vertexPositions[i * 4 + 3];
vert.Uv = new Vector2(0, 1);
m.Verteces.Add(vert);
}
for (int i = 0; i < INDEXCOUNT; i++)
{
m.Indeces.Add(__vertexIndex[i]);
}
sm_mesh = m;
return(new Mesh(m));
}
public static Mesh GetMesh()
{
if (sm_mesh != null)
{
return(new Mesh(sm_mesh));
}
var m = new Mesh();
var tetrahedralAngle = Math.PI * 109.4712f / 180;
var segmentAngle = (float)(Math.PI * 2 / 3);
var currentAngle = 0f;
float radius = 1;
var v = new Vector3[4];
v[0] = new Vector3(0, radius, 0);
for (var i = 1; i <= 3; i++)
{
v[i] = new Vector3((float)(radius * Math.Sin(currentAngle) * Math.Sin(tetrahedralAngle)),
(float)(radius * Math.Cos(tetrahedralAngle)),
(float)(radius * Math.Cos(currentAngle) * Math.Sin(tetrahedralAngle)));
currentAngle = currentAngle + segmentAngle;
}
for (var i = 0; i <= 3; i++)
{
var t = new VertexPositionNormalTexture();
t.Position = v[i];
m.Verteces.Add(t);
}
m.Indeces.AddRange(new uint[] { 0, 1, 2, 1, 3, 2, 0, 2, 3, 0, 3, 1 });
sm_mesh = m;
return(new Mesh(m));
}
public void loadSTL(string path)
{
VertexPositionNormalTexture vertex1 = new VertexPositionNormalTexture();
VertexPositionNormalTexture vertex2 = new VertexPositionNormalTexture();
VertexPositionNormalTexture vertex3 = new VertexPositionNormalTexture();
int phase = -1; //0 normal, 1 nothing, 2 3 4 vertex, 5 6 nothing
int type = -1; //0 ascii, 1 binary
Verteces.Clear();
Indeces.Clear();
StreamReader file = File.OpenText(path);
string lh = file.ReadLine();
if (lh != null && lh.IndexOf("solid ", StringComparison.Ordinal) != -1)
{
type = 0;
}
else
{
type = 1;
}
file.Close();
if (type == 0)
{
file = File.OpenText(path);
while (true)
{
string lineHeader = file.ReadLine();
if (file.EndOfStream || lineHeader == null)
{
break;
}
if (lineHeader.IndexOf("facet normal ", StringComparison.Ordinal) != -1)
{
phase = 0;
}
switch (phase)
{
case 0:
var parts = lineHeader.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
vertex1.Normal = new Vector3(Convert.ToSingle(parts[2], ifp),
Convert.ToSingle(parts[3], ifp),
Convert.ToSingle(parts[4], ifp));
break;
case 2:
parts = lineHeader.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
vertex1.Position = new Vector3(Convert.ToSingle(parts[1], ifp),
Convert.ToSingle(parts[2], ifp),
Convert.ToSingle(parts[3], ifp));
break;
case 3:
parts = lineHeader.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
vertex2.Position = new Vector3(Convert.ToSingle(parts[1], ifp),
Convert.ToSingle(parts[2], ifp),
Convert.ToSingle(parts[3], ifp));
vertex2.Normal = vertex1.Normal;
break;
case 4:
parts = lineHeader.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
vertex3.Position = new Vector3(Convert.ToSingle(parts[1], ifp),
Convert.ToSingle(parts[2], ifp),
Convert.ToSingle(parts[3], ifp));
vertex3.Normal = vertex1.Normal;
Verteces.Add(vertex1);
Verteces.Add(vertex2);
Verteces.Add(vertex3);
break;
}
phase++;
}
file.Close();
}
else
{
var bfile = File.OpenRead(path);
bfile.Read(new byte[80], 0, 80); //80b header
var reader32 = new byte[4];
bfile.Read(reader32, 0, 4);
uint ntri = BitConverter.ToUInt32(reader32, 0);
for (int i = 0; i < ntri; i++)
{
bfile.Read(reader32, 0, 4);
vertex1.Normal.X = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex1.Normal.Y = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex1.Normal.Z = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex1.Position.X = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex1.Position.Y = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex1.Position.Z = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex2.Position.X = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex2.Position.Y = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex2.Position.Z = BitConverter.ToSingle(reader32, 0);
vertex2.Normal = vertex1.Normal;
bfile.Read(reader32, 0, 4);
vertex3.Position.X = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex3.Position.Y = BitConverter.ToSingle(reader32, 0);
bfile.Read(reader32, 0, 4);
vertex3.Position.Z = BitConverter.ToSingle(reader32, 0);
vertex3.Normal = vertex1.Normal;
Verteces.Add(vertex1);
Verteces.Add(vertex2);
Verteces.Add(vertex3);
bfile.Read(reader32, 0, 2);
}
bfile.Close();
}
for (int i = 0; i < Verteces.Count; i++)
{
Indeces.Add((uint)i);
}
}
bool FullIntersect(Ray r, VertexPositionNormalTexture Vertex1, VertexPositionNormalTexture Vertex2, VertexPositionNormalTexture Vertex3)
{
if (Vector3.Dot(r.direction, Vertex1.Normal) < 0)
{
return(false);
}
Vector3 a, b, v;
a = Vertex1.Position - r.position;
b = Vertex2.Position - r.position;
v = Vector3.Cross(a, b);
var ip1 = Vector3.Dot(r.direction, v);
a = Vertex2.Position - r.position;
b = Vertex3.Position - r.position;
v = Vector3.Cross(a, b);
var ip2 = Vector3.Dot(r.direction, v);
a = Vertex3.Position - r.position;
b = Vertex1.Position - r.position;
v = Vector3.Cross(a, b);
var ip3 = Vector3.Dot(r.direction, v);
//if (((ip1 < 0) && (ip2 < 0) && (ip3 < 0)) || ((ip1 > 0) && (ip2 > 0) && (ip3 > 0)))
//{
// var d = dot(Normal, r->direction);
// if (fabs(d) < epsilon) return false;
// ips.t[0] = (-dot(Normal, r->position) - distanse) / d;
// return ips.t[0] >= 0;
//}
return(false);
}
public static float TriangleSquare(VertexPositionNormalTexture v0, VertexPositionNormalTexture v1, VertexPositionNormalTexture v2)
{
var a = (v0.Position - v1.Position).Length;
var b = (v1.Position - v2.Position).Length;
var c = (v0.Position - v2.Position).Length;
var s = (a + b + c) / 2.0f;
var sq = (float)(Math.Sqrt(s * (s - a) * (s - b) * (s - c)) / Math.PI);
return(sq);
}
