private int CreateTetrahedron(SceneBrep scene, Matrix4 m, Vector3 center, float size)
{
int[] v = new int[4];
float z = (float)(size * Math.Sqrt(0.5));
Vector3 A = new Vector3(size, 0.0f, -z);
Vector3 B = new Vector3(-size, 0.0f, -z);
Vector3 C = new Vector3(0.0f, size, z);
Vector3 D = new Vector3(0.0f, -size, z);
// vertices:
v[0] = scene.AddVertex(Vector3.TransformPosition(A, m));
v[1] = scene.AddVertex(Vector3.TransformPosition(B, m));
v[2] = scene.AddVertex(Vector3.TransformPosition(C, m));
v[3] = scene.AddVertex(Vector3.TransformPosition(D, m));
// normal vectors:
scene.SetNormal(v[0], Vector3.TransformVector(A, m).Normalized());
scene.SetNormal(v[1], Vector3.TransformVector(B, m).Normalized());
scene.SetNormal(v[2], Vector3.TransformVector(C, m).Normalized());
scene.SetNormal(v[3], Vector3.TransformVector(D, m).Normalized());
// texture coordinates:
scene.SetTxtCoord(v[0], new Vector2(1.0f, 0.0f));
scene.SetTxtCoord(v[1], new Vector2(0.0f, 0.0f));
scene.SetTxtCoord(v[2], new Vector2(1.0f, 1.0f));
scene.SetTxtCoord(v[3], new Vector2(0.0f, 1.0f));
// colors:
long seed = (long)Math.Min(long.MaxValue, (m.Row3.LengthSquared * 10000.0f));
seed = RandomStatic.numericRecipes(seed);
float r = (seed & 255) / 255.0f;
seed = RandomStatic.numericRecipes(seed);
float g = (seed & 255) / 255.0f;
seed = RandomStatic.numericRecipes(seed);
float b = (seed & 255) / 255.0f;
scene.SetColor(v[0], new Vector3(r, g, b));
r = Math.Min(r + 0.2f, 1.0f);
scene.SetColor(v[1], new Vector3(r, g, b));
g = Math.Min(g + 0.2f, 1.0f);
scene.SetColor(v[2], new Vector3(r, g, b));
b = Math.Min(b + 0.2f, 1.0f);
scene.SetColor(v[3], new Vector3(r, g, b));
// triangle faces:
scene.AddTriangle(v[0], v[1], v[2]);
scene.AddTriangle(v[2], v[1], v[3]);
scene.AddTriangle(v[1], v[0], v[3]);
scene.AddTriangle(v[2], v[3], v[0]);
return(4);
}
private int drawRose(SceneBrep scene, Matrix4 m, string param)
{
int number_of_points = segments;
double period = Math.PI * d;
if ((n % 2 == 0) || (d % 2 == 0))
{
period *= 2;
}
double s = 0.0;
double ds = 1.0 / number_of_points;
double dtheta = period / number_of_points;
List <int> points = new List <int>();
double k = (double)n / d;
for (int i = 0; i < number_of_points; i++)
{
double theta = i * dtheta;
double r = scale * Math.Cos(k * theta);
float x = (float)(r * Math.Cos(theta * ratioX));
float y = (float)(r * Math.Sin(theta * ratioY));
float z = (float)(r * Math.Cos(theta * i * ratioZ));
if (noRatioZ)
{
z = (float)(r * Math.Cos(theta));
}
if (noRatioX)
{
x = (float)(r * Math.Cos(theta));
}
if (noRatioY)
{
y = (float)(r * Math.Sin(theta));
}
Vector3 A = new Vector3(x, y, z);
int v = scene.AddVertex(Vector3.TransformPosition(A, m));
points.Add(v);
scene.SetTxtCoord(v, new Vector2((float)s, (float)s));
System.Drawing.Color c = Raster.Draw.ColorRamp(0.5 * (s + 1.0));
scene.SetColor(v, new Vector3(c.R / 255.0f, c.G / 255.0f, c.B / 255.0f));
s += ds;
}
for (int i = 0; i < number_of_points - 1; i++)
{
scene.AddLine(points[i], points[i + 1]);
}
scene.AddLine(points[0], points[points.Count - 1]);
return(number_of_points);
}
/// <summary>
/// Construct a new Brep solid (preferebaly closed = regular one).
/// </summary>
/// <param name="scene">B-rep scene to be modified</param>
/// <param name="m">Transform matrix (object-space to world-space)</param>
/// <param name="param">Shape parameters if needed</param>
/// <returns>Number of generated faces (0 in case of failure)</returns>
public int AddMesh(SceneBrep scene, Matrix4 m, string param)
{
// {{ TODO: put your Mesh-construction code here
parseParams(param);
// If there will be large number of new vertices, reserve space for them to save time.
scene.Reserve(segments + 1);
double t = 0.0;
double dt = maxT / segments;
double s = 0.0; // for both texture coordinate & color ramp
double ds = 1.0 / segments;
int vPrev = 0;
Vector3 A;
for (int i = 0; i <= segments; i++)
{
// New vertex's coordinates.
A.X = (float)(radius * Math.Cos(kx * t + dx));
A.Y = (float)(radius * Math.Cos(ky * t + dy));
A.Z = (float)(radius * Math.Cos(kz * t + dz));
// New vertex.
int v = scene.AddVertex(Vector3.TransformPosition(A, m));
// Vertex attributes.
scene.SetTxtCoord(v, new Vector2((float)s, (float)s));
System.Drawing.Color c = Raster.Draw.ColorRamp(0.5 * (s + 1.0));
scene.SetColor(v, new Vector3(c.R / 255.0f, c.G / 255.0f, c.B / 255.0f));
// New line?
if (i > 0)
{
scene.AddLine(vPrev, v);
}
// Next vertex.
t += dt;
s += ds;
vPrev = v;
}
// Thick line (for rendering).
scene.LineWidth = 3.0f;
return(segments);
// }}
}
private int drawOctahedron(SceneBrep scene, Matrix4 m, string param, float sc, Vector3 color, double s, double theta)
{
int one, two, three, four, five, six;
float localScale = (float)sc;
Vector4 row1 = new Vector4((float)Math.Cos(theta), (float)-Math.Sin(theta), 0, 0);
Vector4 row2 = new Vector4((float)Math.Sin(theta), (float)Math.Cos(theta), 0, 0);
Vector4 row3 = new Vector4(0, 0, 1, 0);
Vector4 row4 = new Vector4(0, 0, 0, 1);
m = new Matrix4(row1, row2, row3, row4);
Vector3 A = new Vector3(localScale, 0, 0);
one = scene.AddVertex(Vector3.TransformPosition(A, m));
A = new Vector3(0, localScale, 0);
two = scene.AddVertex(Vector3.TransformPosition(A, m));
A = new Vector3(-localScale, 0, 0);
three = scene.AddVertex(Vector3.TransformPosition(A, m));
A = new Vector3(0, -localScale, 0);
four = scene.AddVertex(Vector3.TransformPosition(A, m));
A = new Vector3(0, 0, localScale);
five = scene.AddVertex(Vector3.TransformPosition(A, m));
A = new Vector3(0, 0, -localScale);
six = scene.AddVertex(Vector3.TransformPosition(A, m));
scene.SetTxtCoord(one, new Vector2((float)s, (float)s));
scene.SetTxtCoord(two, new Vector2((float)s, (float)s));
scene.SetTxtCoord(three, new Vector2((float)s, (float)s));
scene.SetTxtCoord(four, new Vector2((float)s, (float)s));
scene.SetTxtCoord(five, new Vector2((float)s, (float)s));
scene.SetTxtCoord(six, new Vector2((float)s, (float)s));
scene.SetColor(one, color);
scene.SetColor(two, color);
scene.SetColor(three, color);
scene.SetColor(four, color);
scene.SetColor(five, color);
scene.SetColor(six, color);
scene.AddLine(one, two);
scene.AddLine(two, three);
scene.AddLine(three, four);
scene.AddLine(four, one);
scene.AddLine(five, one);
scene.AddLine(five, two);
scene.AddLine(five, three);
scene.AddLine(five, four);
scene.AddLine(six, one);
scene.AddLine(six, two);
scene.AddLine(six, three);
scene.AddLine(six, four);
return(6);
}
private int drawSpiral(SceneBrep scene, Matrix4 m, string param)
{
int number_of_points = segments;
double period = Math.PI * scale;
double dtheta = period / number_of_points;
List <int> points = new List <int>();
double ds = 1.0 / (double)number_of_points;
double s = 0.0;
for (int i = 0; i < number_of_points; i++)
{
double theta = i * dtheta;
float x = (float)(s * s * Math.Cos(theta * ratioX));
float y = (float)(s * s * Math.Sin(theta * ratioY));
float z = (float)(s * s);
Vector3 A = new Vector3(x, y, z);
int v = scene.AddVertex(Vector3.TransformPosition(A, m));
scene.SetTxtCoord(v, new Vector2((float)s, (float)s));
System.Drawing.Color c = Raster.Draw.ColorRamp(0.5 * (s + 1.0));
scene.SetColor(v, new Vector3(c.R / 255.0f, c.G / 255.0f, c.B / 255.0f));
points.Add(v);
s += ds;
}
for (int i = 0; i < number_of_points - 1; i++)
{
scene.AddLine(points[i], points[i + 1]);
}
//scene.AddLine(points[0], points[points.Count - 1]);
return(number_of_points);
}
public int ReadBrep(string fileName, SceneBrep scene)
{
Debug.Assert(scene != null);
this.scene = scene;
scene.Reset();
if (fileName == null || fileName.Length == 0)
{
throw new IOException("Invalid file name");
}
if (fileName.EndsWith(".gz"))
{
headerReader = new StreamReader(new GZipStream(new FileStream(fileName, FileMode.Open), CompressionMode.Decompress));
}
else
{
var fs = new FileStream(fileName, FileMode.Open);
headerReader = new StreamReader(fs);
}
// prepare buffers for data filling
if (!ParseHeader())
{
return(-1);
}
// read vertices
var vertexReader = GetReader("vertex");
var element = vertexReader.ReadElement();
List <Vector2> txtCoords = new List <Vector2>(256);
int[] f = new int[3];
int v0 = scene.Vertices;
int lastVertex = v0 - 1;
while (element != null)
{
lastVertex = scene.AddVertex(Vector3.TransformPosition(element.GetVertex(), matrix));
if (DoNormals)
{
Vector3.TransformNormal(element.GetNormal(), matrix);
scene.SetNormal(lastVertex, element.GetNormal());
}
if (DoTxtCoords)
{
scene.SetTxtCoord(lastVertex, element.GetTextureCoordinate());
}
if (DoColors)
{
scene.SetColor(lastVertex, element.GetVertexColor());
}
element = vertexReader.ReadElement();
}
// read triangles
var faceReader = GetReader("face");
element = faceReader.ReadElement();
while (element != null)
{
int A, B, C;
element.GetTriangleVertices(out A, out B, out C);
scene.AddTriangle(A, B, C);
element = faceReader.ReadElement();
}
headerReader.Close();
vertexReader.Close();
faceReader.Close();
return(scene.Triangles);
}
/// <summary>
/// Reads one 3D scene from a given stream (containing text variant of Wavefront OBJ format).
/// </summary>
/// <param name="reader">Already open text reader</param>
/// <param name="scene">Scene to be modified</param>
/// <param name="scene">Matrix for instancing</param>
/// <returns>Number of faces read</returns>
public int ReadBrep(StreamReader reader, SceneBrep scene, Matrix4 m)
{
if (reader == null)
{
return(SceneBrep.NULL);
}
Debug.Assert(scene != null);
int v0 = scene.Vertices;
int lastVertex = v0 - 1;
int faces = 0;
List <Vector2> txtCoords = new List <Vector2>(256);
List <Vector3> normals = new List <Vector3>(256);
int lastTxtCoord = -1;
int lastNormal = -1;
int[] f = new int[3];
do
{
string line = reader.ReadLine();
if (line == null)
{
break;
}
int commentPos = line.IndexOf(COMMENT);
if (commentPos >= 0)
{
line = line.Substring(0, commentPos);
}
string[] tokens = line.Split(DELIMITERS, StringSplitOptions.RemoveEmptyEntries);
if (tokens.Length < 1)
{
continue;
}
switch (tokens[0])
{
case VERTEX:
if (tokens.Length < 4)
{
continue;
}
Vector3 coord;
if (!float.TryParse(tokens[1], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.X) ||
!float.TryParse(tokens[2], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Y) ||
!float.TryParse(tokens[3], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Z))
{
continue;
}
if (MirrorConversion)
{
coord.Z = -coord.Z;
}
lastVertex = scene.AddVertex(Vector3.TransformPosition(coord, m));
break;
case VERTEX_TEXTURE:
if (tokens.Length < 3)
{
continue;
}
Vector2 txtCoord;
if (!float.TryParse(tokens[1], NumberStyles.Float, CultureInfo.InvariantCulture, out txtCoord.X) ||
!float.TryParse(tokens[2], NumberStyles.Float, CultureInfo.InvariantCulture, out txtCoord.Y))
{
continue;
}
if (TextureUpsideDown)
{
txtCoord.Y = 1.0f - txtCoord.Y;
}
txtCoords.Add(txtCoord);
lastTxtCoord++;
break;
case VERTEX_NORMAL:
if (tokens.Length < 4)
{
continue;
}
Vector3 norm;
if (!float.TryParse(tokens[1], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.X) ||
!float.TryParse(tokens[2], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Y) ||
!float.TryParse(tokens[3], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Z))
{
continue;
}
if (MirrorConversion)
{
norm.Z = -norm.Z;
}
normals.Add(Vector3.TransformNormal(norm, m));
lastNormal++;
break;
case FACE:
if (tokens.Length < 4)
{
continue;
}
int N = tokens.Length - 1;
if (f.Length < N)
{
f = new int[N];
}
int i;
for (i = 0; i < N; i++) // read indices for one vertex
{
string[] vt = tokens[i + 1].Split('/');
int ti, ni;
ti = ni = 0; // 0 => value not present
// 0 .. vertex coord index
if (!int.TryParse(vt[0], out f[i]) ||
f[i] == 0)
{
break;
}
if (f[i] > 0)
{
f[i] = v0 + f[i] - 1;
}
else
{
f[i] = lastVertex + 1 - f[i];
}
if (vt.Length > 1)
{
// 1 .. texture coord index (not yet)
if (!int.TryParse(vt[1], out ti))
{
ti = 0;
}
if (vt.Length > 2)
{
// 2 .. normal vector index
if (!int.TryParse(vt[2], out ni))
{
ni = 0;
}
}
}
// there was a texture coord..
if (ti != 0)
{
if (ti > 0)
{
ti--;
}
else
{
ti = lastTxtCoord + 1 - ti;
}
if (ti >= 0 && ti < txtCoords.Count)
{
scene.SetTxtCoord(f[i], txtCoords[ti]);
}
}
// there was a normal..
if (ni != 0)
{
if (ni > 0)
{
ni--;
}
else
{
ni = lastNormal + 1 - ni;
}
if (ni >= 0 && ni < normals.Count)
{
scene.SetNormal(f[i], normals[ni]);
}
}
}
N = i;
for (i = 1; i < N - 1; i++)
{
scene.AddTriangle(f[0], f[i], f[i + 1]);
faces++;
}
break;
}
} while (!reader.EndOfStream);
return(faces);
}
