/// <summary>
/// Reads one 3D scene from a given file (containing text variant of Wavefront OBJ format).
/// Can read GZipped files.
/// </summary>
/// <param name="fileName">File-name (ending by .gz for gzipped file)</param>
/// <param name="scene">Scene to be modified</param>
/// <returns>Number of faces read</returns>
public int ReadBrep(string fileName, SceneBrep scene)
{
if (fileName == null ||
fileName.Length == 0)
{
return(SceneBrep.NULL);
}
StreamReader reader;
if (fileName.EndsWith(".gz"))
{
reader = new StreamReader(new GZipStream(new FileStream(fileName, FileMode.Open),
CompressionMode.Decompress));
}
else
{
reader = new StreamReader(new FileStream(fileName, FileMode.Open));
}
int faces = ReadBrep(reader, scene);
reader.Close();
return(faces);
}
void AddToScene(SceneBrep scene, List <Vector3> v, int total)
{
for (int i = total; i > total - v.Count + 1; i--)
{
scene.AddLine(i, i - 1);
}
}
private void firstCircle(Vector3 v1, Vector3 v2, SceneBrep scene, Matrix4 m)
{
Vector3 dif = (v2 - v1) * size;
Vector3 rdif = (v2 - v1) * (1 - size);
last_circle = createCircleAround(v1, v2);
float s = radius / curve.current_count;
last_circle = Transforms.scale(last_circle, s, s, s);
connect_indices = new int[cdetail];
Vector3 center = getCenter(last_circle);
for (int i = 0; i < cdetail; i++)
{
connect_indices[i] = scene.AddVertex(Vector3.TransformPosition(last_circle[i] + v1, m));
scene.SetNormal(connect_indices[i], Vector3.TransformVector(last_circle[i] - center, m).Normalized());
float r = (last_circle[i].X + v1.X + 1.1f) / 2.5f;
float g = (last_circle[i].Y + v1.Y + 1.1f) / 2.5f;
float b = (last_circle[i].Z + v1.Z + 1.1f) / 2.5f;
scene.SetColor(connect_indices[i], new Vector3(r, g, b));
}
for (int i = 0; i < cdetail; i++)
{
last_circle[i] += v1 + rdif;
}
}
/// <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)
{
parseParams(param);
scene.Reserve(10000000);
curve = Curve.createCurve(level);
firstCircle(curve.current_vertices[0], curve.current_vertices[1], scene, m);
int count = 0;
for (int i = 1; i < curve.current_vertices.Length - 1; i++)
{
if (isBent(curve.current_vertices[i - 1], curve.current_vertices[i], curve.current_vertices[i + 1]))
{
count += createBentPipe(scene, m, curve.current_vertices[i - 1], curve.current_vertices[i], curve.current_vertices[i + 1]);
}
else
{
Vector3 dif = curve.current_vertices[i] - curve.current_vertices[i - 1];
for (int j = 0; j < cdetail; j++)
{
last_circle[j] = last_circle[j] + dif;
}
}
}
int l = curve.current_vertices.Length;
count += lastCircle(curve.current_vertices[l - 2], curve.current_vertices[l - 1], scene, m);
return(count);
}
private int lastCircle(Vector3 v1, Vector3 v2, SceneBrep scene, Matrix4 m)
{
_ = createCircleAround(v1, v2);
Vector3 center = getCenter(last_circle);
Vector3 dif = (v2 - v1) * size;
_ = (v2 - v1) * (1 - size);
int[] v = new int[cdetail];
for (int i = 0; i < cdetail; i++)
{
v[i] = scene.AddVertex(Vector3.TransformPosition(last_circle[i] + dif, m));
scene.SetNormal(v[i], Vector3.TransformVector(last_circle[i] - center, m).Normalized());
float r = (last_circle[i].X + 1.1f) / 2.5f;
float g = (last_circle[i].Y + 1.1f) / 2.5f;
float b = (last_circle[i].Z + 1.1f) / 2.5f;
scene.SetColor(v[i], new Vector3(r, g, b));
}
for (int i = 0; i < cdetail - 1; i++)
{
scene.AddTriangle(connect_indices[i], v[i], connect_indices[i + 1]);
scene.AddTriangle(connect_indices[i + 1], v[i], v[i + 1]);
}
scene.AddTriangle(connect_indices[cdetail - 1], v[cdetail - 1], connect_indices[0]);
scene.AddTriangle(connect_indices[0], v[cdetail - 1], v[0]);
return(cdetail * 2);
}
private int drawKoch(SceneBrep scene, Matrix4 m, string param)
{
Vector3 A, B, C, D;
int one, two, three, four;
//float a = 1.0f;
A.X = 0;
A.Y = 0;
A.Z = 0;
one = scene.AddVertex(Vector3.TransformPosition(A, m));
B.X = 1.0f;
B.Y = 1.0f;
B.Z = 0;
two = scene.AddVertex(Vector3.TransformPosition(B, m));
C.X = 0;
C.Y = 1.0f;
C.Z = 1.0f;
three = scene.AddVertex(Vector3.TransformPosition(C, m));
D.X = 1.0f;
D.Y = 0;
D.Z = 1.0f;
four = scene.AddVertex(Vector3.TransformPosition(D, m));
scene.AddLine(one, two);
scene.AddLine(two, three);
scene.AddLine(three, one);
scene.AddLine(four, one);
scene.AddLine(four, two);
scene.AddLine(four, three);
drawKochRecursive(depthParam, scene, m, param, A, B, C, D);
return(segments + (int)Math.Pow(4, depthParam) + 1);
}
public SceneBrep Clone()
{
SceneBrep tmp = new SceneBrep();
tmp.geometry = new List <Vector3>(geometry);
if (normals != null)
{
tmp.normals = new List <Vector3>(normals);
}
if (colors != null)
{
tmp.colors = new List <Vector3>(colors);
}
if (txtCoords != null)
{
tmp.txtCoords = new List <Vector2>(txtCoords);
}
if (vertexPtr != null)
{
tmp.vertexPtr = new List <int>(vertexPtr);
}
if (oppositePtr != null)
{
tmp.oppositePtr = new List <int>(oppositePtr);
}
tmp.BuildCornerTable();
return(tmp);
}
/// <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 (bezier)
{
return(drawBezier(scene, m, param));
}
if (tetrahedron)
{
return(drawTetrahedron(scene, m, param));
}
else if (koch)
{
return(drawKoch(scene, m, param));
}
else if (rose)
{
return(drawRose(scene, m, param));
}
else if (octahedron)
{
int ret = 0;
double s = 0.0;
double ds = 1.0 / depthParam;
double period = paramAngle;
double dtheta = period / depthParam;
for (int i = 1; i <= depthParam; ++i)
{
double theta = i * dtheta;
System.Drawing.Color c = Raster.Draw.ColorRamp(0.5 * (s + 1.0));
ret += drawOctahedron(scene, m, param, i, new Vector3(c.R / 255.0f, c.G / 255.0f, c.B / 255.0f), s, theta);
s += ds;
}
return(ret);
}
else if (spiral)
{
return(drawSpiral(scene, m, param));
}
else if (dragon)
{
if (depthParam > 15)
{
depthParam = 15;
}
return(dragonCurve(scene, m, param));
}
else
{
return(drawDefault(scene, m, param));
}
// }}
}
/// <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
return(CreateTetrahedron(scene, m, Vector3.Zero, 1.0f));
// !!!}}
}
/// <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="variant">Shape variant if needed</param>
/// <returns>Number of generated faces (0 in case of failure)</returns>
public int AddMesh( SceneBrep scene, Matrix4 m, float variant )
{
// !!!{{ TODO: put your Mesh-construction code here
return 0;
// !!!}}
}
/// <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="variant">Shape variant if needed</param>
/// <returns>Number of generated faces (0 in case of failure)</returns>
public int AddMesh(SceneBrep scene, Matrix4 m, float variant)
{
// !!!{{ TODO: put your Mesh-construction code here
return(0);
// !!!}}
}
/// <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>
/// <returns>Number of faces read</returns>
public int ReadBrep( StreamReader reader, SceneBrep scene )
{
if ( reader == null ) return SceneBrep.NULL;
Debug.Assert( scene != null );
scene.Reset();
return ReadBrep( reader, scene, Matrix4.Identity );
}
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 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);
}
/// <summary>
/// Returns true if vertex lies on the edge of triangle mesh
/// </summary>
/// <param name="vertex"></param>
/// <returns></returns>
public static bool IsOnEdge(Vector3 vertex, SceneBrep scene)
{
bool onEdge = false;
var handle = scene.GetVertex(vertex);
List <int> trianglePtr = new List <int>();
// get triangles
for (int i = 0; i < scene.vertexPtr.Count; i++)
{
if (scene.vertexPtr[i] == handle)
{
if (i % 3 == 0)
{
trianglePtr.Add(i / 3);
}
else if (i % 3 == 1)
{
trianglePtr.Add((i - 1) / 3);
}
else if (i % 3 == 2)
{
trianglePtr.Add((i - 2) / 3);
}
}
}
// is triangle on edge?
foreach (var ptr in trianglePtr)
{
// get handle of corners of triangle
var c1 = Scene3D.SceneBrep.tCorner(ptr);
var c2 = c1 + 1;
var c3 = c1 + 2;
if (scene.cOpposite(c1) == -1)
{
onEdge = true;
}
else if (scene.cOpposite(c2) == -1)
{
onEdge = true;
}
else if (scene.cOpposite(c3) == -1)
{
onEdge = true;
}
}
return(onEdge);
}
/// <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
// if there will be large number of new vertices, reserve space for them to save time:
scene.Reserve(4);
return(CreateTetrahedron(scene, m, Vector3.Zero, 1.0f));
// !!!}}
}
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>
/// 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>
/// <returns>Number of faces read</returns>
public int ReadBrep(StreamReader reader, SceneBrep scene)
{
if (reader == null)
{
return(SceneBrep.NULL);
}
Debug.Assert(scene != null);
scene.Reset();
return(ReadBrep(reader, scene, Matrix4.Identity));
}
internal void RenderSceneJustCurve(SceneBrep scene)
{
for (int i = 0; i < Vertices.Count; i++)
{
scene.AddVertex(Vertices[i]);
if (i > 0)
{
scene.AddLine(i - 1, i);
}
}
scene.AddLine(0, Vertices.Count - 1);
}
/// <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)
{
parseParams(param);
scene.Reserve(10000000);
Curve c = new Curve(xFreq, yFreq, zFreq, thickness, vertexFreq, circEdgeSize);
c.GenerateThingsForScene(m);
c.RenderSceneSimpleTube(scene);
// c.RenderSceneJustCurve(scene);
return(c.GeneratedFaces);
}
/// <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);
// }}
}
/// <summary>
/// Reads one 3D scene from a given file (containing text variant of Wavefront OBJ format).
/// Can read GZipped files.
/// </summary>
/// <param name="fileName">File-name (ending by .gz for gzipped file)</param>
/// <param name="scene">Scene to be modified</param>
/// <returns>Number of faces read</returns>
public int ReadBrep( String fileName, SceneBrep scene )
{
if ( fileName == null ||
fileName.Length == 0 )
return SceneBrep.NULL;
StreamReader reader;
if ( fileName.EndsWith( ".gz" ) )
reader = new StreamReader( new GZipStream( new FileStream( fileName, FileMode.Open ), CompressionMode.Decompress ) );
else
reader = new StreamReader( new FileStream( fileName, FileMode.Open ) );
int faces = ReadBrep( reader, scene );
reader.Close();
return faces;
}
private void drawTetrahedronRecursive(int depth, SceneBrep scene, Matrix4 m, string param, Vector3 a, Vector3 b, Vector3 c, Vector3 d)
{
if (depth == 0)
{
return;
}
Vector3 stand;
stand.X = 0;
stand.Y = 0;
stand.Z = 0;
int ab, ac, ad, bc, bd, cd;
Vector3 AB = stand, AC = stand, AD = stand;
Vector3 BC = stand, BD = stand;
Vector3 CD = stand;
calculateMiddle(a, b, c, d, ref AB, ref AC, ref AD, ref BC, ref BD, ref CD);
ab = scene.AddVertex(Vector3.TransformPosition(AB, m));
ac = scene.AddVertex(Vector3.TransformPosition(AC, m));
ad = scene.AddVertex(Vector3.TransformPosition(AD, m));
bc = scene.AddVertex(Vector3.TransformPosition(BC, m));
bd = scene.AddVertex(Vector3.TransformPosition(BD, m));
cd = scene.AddVertex(Vector3.TransformPosition(CD, m));
scene.AddLine(ab, ac);
scene.AddLine(ac, bc);
scene.AddLine(bc, ab);
scene.AddLine(ab, bd);
scene.AddLine(bd, ad);
scene.AddLine(ad, ab);
scene.AddLine(ac, ad);
scene.AddLine(ad, cd);
scene.AddLine(cd, ac);
scene.AddLine(bc, cd);
scene.AddLine(cd, bd);
scene.AddLine(bd, bc);
drawTetrahedronRecursive(depth - 1, scene, m, param, AB, b, BC, BD);
drawTetrahedronRecursive(depth - 1, scene, m, param, a, AB, AC, AD);
drawTetrahedronRecursive(depth - 1, scene, m, param, AC, BC, c, CD);
drawTetrahedronRecursive(depth - 1, scene, m, param, AD, BD, CD, d);
}
/// <summary>
/// Writes the whole B-rep scene to a given text stream (uses text variant of Wavefront OBJ format).
/// </summary>
/// <param name="writer">Already open text writer</param>
/// <param name="scene">Scene to write</param>
public void WriteBrep(StreamWriter writer, SceneBrep scene)
{
if (scene == null || scene.Triangles < 1)
{
return;
}
int i;
for (i = 0; i < scene.Vertices; i++)
{
Vector3 v = scene.GetVertex(i);
writer.WriteLine(string.Format(CultureInfo.InvariantCulture, "{0} {1} {2} {3}",
new object[] { VERTEX, v.X, v.Y, v.Z }));
}
bool hasNormals = scene.Normals > 0;
if (hasNormals)
{
for (i = 0; i < scene.Vertices; i++)
{
Vector3 n = scene.GetNormal(i);
writer.WriteLine(string.Format(CultureInfo.InvariantCulture, "{0} {1} {2} {3}",
new object[] { VERTEX_NORMAL, n.X, n.Y, n.Z }));
}
}
for (i = 0; i < scene.Triangles; i++)
{
int A, B, C;
scene.GetTriangleVertices(i, out A, out B, out C);
A++;
B++;
C++;
if (hasNormals)
{
writer.WriteLine("{0} {1}//{1} {2}//{2} {3}//{3}", FACE, A, B, C);
}
else
{
writer.WriteLine("{0} {1} {2} {3}", FACE, A, B, C);
}
}
}
internal void RenderSceneSimpleTube(SceneBrep scene)
{
int total = -1;
for (int i = 0; i < MeshVertices.Count; i++)
{
for (int j = 0; j < MeshVertices[i].Count; j++)
{
scene.AddVertex(MeshVertices[i][j]);
total++;
}
//AddToScene(scene, MeshVertices[i], total);
if (i > 0)
{
ConnectTwoCircles(scene, MeshVertices, total, i);
}
}
ConnectTwoCircles(scene, MeshVertices, total, 0);
}
void ConnectTwoCircles(SceneBrep scene, List <List <Vector3> > MeshV, int total, int index)
{
List <int> firstCirc = new List <int>();
List <int> secCirc = new List <int>();
int count = MeshV[index].Count;
if (index != 0)
{
for (int i = total; i > total - count; i--)
{
firstCirc.Add(i);
secCirc.Add(i - count);
}
//for (int i = 0; i < firstCirc.Count; i++) {
// scene.AddLine(firstCirc[i], secCirc[i]);
// scene.AddLine(firstCirc[i], secCirc[(i + 1 == secCirc .Count ? 0 : i+1)]);
//}
}
else
{
for (int i = total; i > total - count; i--)
{
firstCirc.Add(i);
secCirc.Add(total - i + count);
}
//for (int i = 0; i < firstCirc.Count; i++) {
// scene.AddLine(firstCirc[i], secCirc[i]);
// scene.AddLine(firstCirc[i], secCirc[(i + 1 == secCirc.Count ? 0 : i+1)]);
//}
}
for (int i = 0; i < firstCirc.Count; i++)
{
scene.AddTriangle(firstCirc[i], secCirc[i], secCirc[(i + 1 == secCirc.Count ? 0 : i + 1)]);
this.GeneratedFaces++;
scene.AddTriangle(
firstCirc[(i + 1 == firstCirc.Count ? 0 : i + 1)],
firstCirc[i],
secCirc[(i + 1 == secCirc.Count ? 0 : i + 1)]);
this.GeneratedFaces++;
}
}
public EarClipping(List <int> pointers, Scene3D.SceneBrep scene)
{
// Polygon has at least 3 vertices
if (pointers.Count < 3)
{
return;
}
this.Scene = scene;
// Get coordinates from vertex pointers
PolygonVertices = new List <Vector3>();
pointers.ForEach(x => PolygonVertices.Add(Scene.GetVertex(x)));
PrepareNormal(PolygonVertices);
polygon = new Polygon();
copy = new Polygon();
CreatePolygon(polygon, PolygonVertices);
CreatePolygon(copy, PolygonVertices);
}
private int drawTetrahedron(SceneBrep scene, Matrix4 m, string param)
{
segments = 4;
scene.Reserve(segments + (int)Math.Pow(4, depthParam) + 1);
/*c.Line(0, 0, 0, c.Height);
* c.Line(0, c.Height, c.Width, c.Height / 2);
* c.Line(c.Width, c.Height / 2, 0, 0);
*/
Vector3 A, B, C, D;
int one, two, three, four;
//float a = 1.0f;
A.X = 0;
A.Y = 0;
A.Z = 0;
one = scene.AddVertex(Vector3.TransformPosition(A, m));
B.X = 1.0f;
B.Y = 1.0f;
B.Z = 0;
two = scene.AddVertex(Vector3.TransformPosition(B, m));
C.X = 0;
C.Y = 1.0f;
C.Z = 1.0f;
three = scene.AddVertex(Vector3.TransformPosition(C, m));
D.X = 1.0f;
D.Y = 0;
D.Z = 1.0f;
four = scene.AddVertex(Vector3.TransformPosition(D, m));
scene.AddLine(one, two);
scene.AddLine(two, three);
scene.AddLine(three, one);
scene.AddLine(four, one);
scene.AddLine(four, two);
scene.AddLine(four, three);
drawTetrahedronRecursive(depthParam, scene, m, param, A, B, C, D);
return(segments + (int)Math.Pow(4, depthParam) + 1);
}
private int drawLineBezier(SceneBrep scene, Matrix4 m, string param, Vector3 P0, Vector3 P1, Vector3 P2)
{
int segm = 200;
float hun = 100.0f;
List <int> pointsList = new List <int>();
addCube(scene, m, param);
//P0 -= delta; P1 -= delta;P2 -= delta;
for (int i = 0; i <= 100; i++)
{
float t = ((float)(i)) / hun;
Vector3 P = (1 - t) * ((1 - t) * P0 + t * P1) + t * ((1 - t) * P1 + t * P2);
//float x = (1-t)*(1-t)*x1 + 2*(1-t)*t*x2+t*t*x3;
//float y = (1-t)*(1-t)*y1 + 2*(1-t)*t*y2+t*t*y3;
pointsList.Add(scene.AddVertex(Vector3.TransformPosition(P, m)));
}
for (int i = 0; i < pointsList.Count - 1; i++)
{
scene.AddLine(pointsList[i], pointsList[i + 1]);
}
int p0, p1, p2;
p0 = scene.AddVertex(Vector3.TransformPosition(P0, m));
p1 = scene.AddVertex(Vector3.TransformPosition(P1, m));
p2 = scene.AddVertex(Vector3.TransformPosition(P2, m));
scene.AddLine(p0, p1);
scene.AddLine(p1, p2);
return(segm + 2);
}
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);
}
/// <summary>
/// Do Loop subdivision of the input control triangle mesh.
/// </summary>
/// <param name="scene">Input scene (must not be changed).</param>
/// <param name="epsilon">Reference error toleration (size of undivided triangle).</param>
/// <param name="normals">Generate normals? (optional)</param>
/// <param name="colors">Generate colors? (optional)</param>
/// <param name="txtcoord">Generate texture coordinates? (optional)</param>
/// <param name="time">Current time for animation (optional)</param>
/// <param name="param">Optional additional parameters.</param>
/// <returns>Number of generated points.</returns>
public int Subdivide(SceneBrep scene, float epsilon, bool normals, bool colors, bool txtcoord, float time, string param)
{
result = scene.Clone();
// !!!{{ TODO: put your Loop subdivision code here
// pilot: do one (trivial) division
int triangles = result.Triangles;
int tr;
for (tr = 0; tr < triangles; tr++)
{
int A, B, C;
result.GetTriangleVertices(tr, out A, out B, out C);
Vector3 vA = result.GetVertex(A);
Vector3 vB = result.GetVertex(B);
Vector3 vC = result.GetVertex(C);
Vector3 vA2 = (vB + vC) * 0.5f;
Vector3 vB2 = (vA + vC) * 0.5f;
Vector3 vC2 = (vA + vB) * 0.5f;
int A2 = result.AddVertex(vA2);
int B2 = result.AddVertex(vB2);
int C2 = result.AddVertex(vC2);
result.AddTriangle(B2, C2, A2);
result.AddTriangle(B2, A2, C);
result.AddTriangle(C2, B, A2);
result.SetTriangleVertices(tr, A, C2, B2);
}
//result.BuildCornerTable();
return(result.Vertices);
// !!!}}
}
/// <summary>
/// Construct a new control mesh for subdivision (formally the Brep solid..).
/// </summary>
/// <param name="scene">B-rep scene to be modified</param>
/// <param name="m">Transform matrix (object-space to world-space)</param>
/// <param name="time">Current time in seconds</param>
/// <param name="param">Shape parameters if needed</param>
public void ControlMesh(SceneBrep scene, Matrix4 m, float time, string param)
{
// !!!{{ TODO: put your Control-mesh-construction code here
List <int> upper = new List <int>();
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 1, 0), m)));
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 1, 0), m)));
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 1, 1), m)));
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 1, 1), m)));
List <int> lower = new List <int>();
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 0, 0), m)));
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 0, 0), m)));
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 0, 1), m)));
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 0, 1), m)));
// Lower face
scene.AddTriangle(lower[0], lower[1], lower[2]);
scene.AddTriangle(lower[2], lower[3], lower[0]);
// Upper face
scene.AddTriangle(upper[2], upper[1], upper[0]);
scene.AddTriangle(upper[0], upper[3], upper[2]);
// Side faces
for (int i = 0; i < upper.Count; i++)
{
int j = i < (upper.Count - 1) ? i + 1 : 0;
scene.AddTriangle(upper[i], upper[j], lower[i]);
scene.AddTriangle(lower[i], upper[j], lower[j]);
}
// !!!}}
}
/// <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 faces = 0;
List<Vector3> normals = new List<Vector3>( 256 );
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( ' ' );
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;
scene.AddVertex( Vector3.Transform( coord, m ) );
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 ) );
break;
case FACE:
if ( tokens.Length < 4 ) continue;
int i;
for ( i = 0; i < 3; i++ )
{
string[] vt = tokens[ i + 1 ].Split( '/' );
int ti, ni;
ti = ni = SceneBrep.NULL;
// 0 .. vertex coord index
if ( !int.TryParse( vt[ 0 ], out f[ i ] ) ) break;
f[ i ] = v0 + f[ i ] - 1;
if ( vt.Length >= 2 )
{
// 1 .. texture coord index (not yet)
int.TryParse( vt[ 1 ], out ti );
ti--;
if ( vt.Length >= 3 )
{
// 2 .. normal vector index
int.TryParse( vt[ 2 ], out ni );
ni--;
}
}
if ( ni >= 0 && ni < normals.Count )
scene.SetNormal( f[ i ], normals[ ni ] );
}
if ( i >= 3 )
{
scene.AddTriangle( f[ 0 ], f[ 1 ], f[ 2 ] );
faces++;
}
break;
}
}
while ( !reader.EndOfStream );
return faces;
}
/// <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<Vector3> normals = new List<Vector3>( 256 );
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.Transform( coord, m ) );
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 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;
}
/// <summary>
/// Writes the whole B-rep scene to a given text stream (uses text variant of Wavefront OBJ format).
/// </summary>
/// <param name="writer">Already open text writer</param>
/// <param name="scene">Scene to write</param>
public void WriteBrep( StreamWriter writer, SceneBrep scene )
{
if ( scene == null || scene.Triangles < 1 ) return;
int i;
for ( i = 0; i < scene.Vertices; i++ )
{
Vector3 v = scene.GetVertex( i );
writer.WriteLine( String.Format( CultureInfo.InvariantCulture, "{0} {1} {2} {3}", new object[] { VERTEX, v.X, v.Y, v.Z } ) );
}
bool hasNormals = scene.Normals > 0;
if ( hasNormals )
for ( i = 0; i < scene.Vertices; i++ )
{
Vector3 n = scene.GetNormal( i );
writer.WriteLine( String.Format( CultureInfo.InvariantCulture, "{0} {1} {2} {3}", new object[] { VERTEX_NORMAL, n.X, n.Y, n.Z } ) );
}
for ( i = 0; i < scene.Triangles; i++ )
{
int A, B, C;
scene.GetTriangleVertices( i, out A, out B, out C );
A++; B++; C++;
if ( hasNormals )
writer.WriteLine( "{0} {1}//{1} {2}//{2} {3}//{3}", FACE, A, B, C );
else
writer.WriteLine( "{0} {1} {2} {3}", FACE, A, B, C );
}
}
private void drawKochRecursive(int depth, SceneBrep scene, Matrix4 m, string param, Vector3 a, Vector3 b, Vector3 c, Vector3 d)
{
if (depth == 0)
{
return;
}
Vector3 stand;
stand.X = 0;
stand.Y = 0;
stand.Z = 0;
int ab, ac, ad, bc, bd, cd, headabc, headadb, headacd, headbdc;
Vector3 AB = stand, AC = stand, AD = stand;
Vector3 BC = stand, BD = stand;
Vector3 CD = stand;
calculateMiddle(a, b, c, d, ref AB, ref AC, ref AD, ref BC, ref BD, ref CD);
float lengthOfSide = (float)Math.Sqrt((AB.X - BC.X) * (AB.X - BC.X) + (AB.Y - BC.Y) * (AB.Y - BC.Y) + (AB.Z - BC.Z) * (AB.Z - BC.Z));
float height = lengthOfSide * (float)Math.Sqrt(6) / 3.0f;
Vector3 headABC = calculateHeightVertex(a, b, c, height);
Vector3 headADB = calculateHeightVertex(a, d, b, height);
Vector3 headACD = calculateHeightVertex(a, c, d, height);
Vector3 headBDC = calculateHeightVertex(b, d, c, height);
ab = scene.AddVertex(Vector3.TransformPosition(AB, m));
ac = scene.AddVertex(Vector3.TransformPosition(AC, m));
ad = scene.AddVertex(Vector3.TransformPosition(AD, m));
bc = scene.AddVertex(Vector3.TransformPosition(BC, m));
bd = scene.AddVertex(Vector3.TransformPosition(BD, m));
cd = scene.AddVertex(Vector3.TransformPosition(CD, m));
headabc = scene.AddVertex(Vector3.TransformPosition(headABC, m));
headadb = scene.AddVertex(Vector3.TransformPosition(headADB, m));
headacd = scene.AddVertex(Vector3.TransformPosition(headACD, m));
headbdc = scene.AddVertex(Vector3.TransformPosition(headBDC, m));
scene.AddLine(ab, ac);
scene.AddLine(ac, bc);
scene.AddLine(bc, ab);
scene.AddLine(ab, headabc);
scene.AddLine(ac, headabc);
scene.AddLine(bc, headabc);
scene.AddLine(ab, bd);
scene.AddLine(bd, ad);
scene.AddLine(ad, ab);
scene.AddLine(ab, headadb);
scene.AddLine(bd, headadb);
scene.AddLine(ad, headadb);
scene.AddLine(ac, ad);
scene.AddLine(ad, cd);
scene.AddLine(cd, ac);
scene.AddLine(ac, headacd);
scene.AddLine(ad, headacd);
scene.AddLine(cd, headacd);
scene.AddLine(bc, cd);
scene.AddLine(cd, bd);
scene.AddLine(bd, bc);
scene.AddLine(bc, headbdc);
scene.AddLine(bd, headbdc);
scene.AddLine(cd, headbdc);
drawKochRecursive(depth - 1, scene, m, param, AB, AC, BC, headABC);
drawKochRecursive(depth - 1, scene, m, param, AB, BD, AD, headADB);
drawKochRecursive(depth - 1, scene, m, param, AD, CD, AC, headACD);
drawKochRecursive(depth - 1, scene, m, param, BD, BC, CD, headBDC);
}
public SceneBrep Clone()
{
SceneBrep tmp = new SceneBrep();
tmp.geometry = new List<Vector3>( geometry );
if ( normals != null ) tmp.normals = new List<Vector3>( normals );
if ( colors != null ) tmp.colors = new List<Vector3>( colors );
if ( txtCoords != null ) tmp.txtCoords = new List<Vector2>( txtCoords );
if ( vertexPtr != null ) tmp.vertexPtr = new List<int>( vertexPtr );
if ( oppositePtr != null ) tmp.oppositePtr = new List<int>( oppositePtr );
tmp.BuildCornerTable();
return tmp;
}
public void Render( Bitmap output, SceneBrep scene )
{
if ( output == null ||
scene == null ) return;
// center of the object = point to look at:
double cx = 0.0;
double cy = 0.0;
double cz = 0.0;
float minx = float.MaxValue;
float miny = float.MaxValue;
float minz = float.MaxValue;
float maxx = float.MinValue;
float maxy = float.MinValue;
float maxz = float.MinValue;
int n = scene.Vertices;
int i;
for ( i = 0; i < n; i++ )
{
Vector3 vi = scene.GetVertex( i );
cx += vi.X;
cy += vi.Y;
cz += vi.Z;
if ( vi.X < minx ) minx = vi.X;
if ( vi.Y < miny ) miny = vi.Y;
if ( vi.Z < minz ) minz = vi.Z;
if ( vi.X > maxx ) maxx = vi.X;
if ( vi.Y > maxy ) maxy = vi.Y;
if ( vi.Z > maxz ) maxz = vi.Z;
}
Vector3 center = new Vector3( (float)(cx / n),
(float)(cy / n),
(float)(cz / n) );
float diameter = (float)Math.Sqrt( (maxx - minx) * (maxx - minx) +
(maxy - miny) * (maxy - miny) +
(maxz - minz) * (maxz - minz) );
if ( Distance < diameter ) Distance = diameter;
// and the rest of projection matrix goes here:
int width = output.Width;
int height = output.Height;
float aspect = width / (float)height;
double az = Azimuth / 180.0 * Math.PI;
double el = Elevation / 180.0 * Math.PI;
Vector3 eye = new Vector3( (float)(center.X + Distance * Math.Sin( az ) * Math.Cos( el )),
(float)(center.Y + Distance * Math.Sin( el )),
(float)(center.Z + Distance * Math.Cos( az ) * Math.Cos( el )) );
Matrix4 modelView = Matrix4.LookAt( eye, center, Vector3.UnitY );
Matrix4 proj;
if ( Perspective )
{
float vv = (float)(2.0 * Math.Atan2( diameter * 0.5, Distance ));
proj = Matrix4.CreatePerspectiveFieldOfView( vv, aspect, 1.0f, 50.0f );
}
else
{
float vHalf = diameter * 0.52f;
proj = Matrix4.CreateOrthographicOffCenter( -vHalf, vHalf,
-vHalf / aspect, vHalf / aspect,
1.0f, 50.0f );
}
Matrix4 compound = Matrix4.Mult( modelView, proj );
Matrix4 viewport = Geometry.SetViewport( 0, 0, width, height );
compound = Matrix4.Mult( compound, viewport );
// wireframe rendering:
Graphics gr = Graphics.FromImage( output );
Pen pen = new Pen( Color.FromArgb( 255, 255, 80 ), 1.0f );
n = scene.Triangles;
for ( i = 0; i < n; i++ )
{
Vector4 A, B, C;
scene.GetTriangleVertices( i, out A, out B, out C );
A = Vector4.Transform( A, compound );
B = Vector4.Transform( B, compound );
C = Vector4.Transform( C, compound );
Vector2 a = new Vector2( A.X / A.W, A.Y / A.W );
Vector2 b = new Vector2( B.X / B.W, B.Y / B.W );
Vector2 c = new Vector2( C.X / C.W, C.Y / C.W );
gr.DrawLine( pen, a.X, a.Y, b.X, b.Y );
gr.DrawLine( pen, b.X, b.Y, c.X, c.Y );
gr.DrawLine( pen, c.X, c.Y, a.X, a.Y );
}
if ( DrawNormals && scene.Normals > 0 )
{
pen = new Pen( Color.FromArgb( 255, 80, 80 ), 1.0f );
n = scene.Vertices;
for ( i = 0; i < n; i++ )
{
Vector4 V = new Vector4( scene.GetVertex( i ), 1.0f );
Vector3 N = scene.GetNormal( i );
N.Normalize();
N *= diameter * 0.03f;
Vector4 W = V + new Vector4( N );
V = Vector4.Transform( V, compound );
W = Vector4.Transform( W, compound );
Vector2 v = new Vector2( V.X / V.W, V.Y / V.W );
Vector2 w = new Vector2( W.X / W.W, W.Y / W.W );
gr.DrawLine( pen, v.X, v.Y, w.X, w.Y );
}
}
}
/// <summary>
/// Generic OBJ-loading scene definition routine.
/// </summary>
/// <param name="dir">Viewing direction of a camera.</param>
/// <param name="FoVy">Field of View in degrees.</param>
/// <param name="correction">Value less than 1.0 brings camera nearer.</param>
/// <param name="name">OBJ file-name.</param>
/// <param name="names">Substitute file-name[s].</param>
/// <returns>Number of triangles.</returns>
protected static long SceneObj( IRayScene sc, Vector3d dir, double FoVy, double correction, string name, string[] names, double[] surfaceColor )
{
Debug.Assert( sc != null );
Vector3 center = Vector3.Zero; // center of the mesh
dir.Normalize(); // normalized viewing vector of the camera
float diameter = 2.0f; // default scene diameter
int faces = 0;
// CSG scene:
CSGInnerNode root = new CSGInnerNode( SetOperation.Union );
// OBJ file to read:
if ( names.Length == 0 ||
names[ 0 ].Length == 0 )
names = new string[] { name };
string[] paths = Scenes.SmartFindFiles( names );
if ( paths[ 0 ] == null || paths[ 0 ].Length == 0 )
{
for ( int i = 0; i < names.Length; i++ )
if ( names[ i ].Length > 0 )
names[ i ] += ".gz";
paths = Scenes.SmartFindFiles( names );
}
if ( paths[ 0 ] == null || paths[ 0 ].Length == 0 )
root.InsertChild( new Sphere(), Matrix4d.Identity );
else
{
// B-rep scene construction:
WavefrontObj objReader = new WavefrontObj();
objReader.MirrorConversion = false;
SceneBrep brep = new SceneBrep();
faces = objReader.ReadBrep( paths[ 0 ], brep );
brep.BuildCornerTable();
diameter = brep.GetDiameter( out center );
TriangleMesh m = new TriangleMesh( brep );
root.InsertChild( m, Matrix4d.Identity );
}
root.SetAttribute( PropertyName.REFLECTANCE_MODEL, new PhongModel() );
root.SetAttribute( PropertyName.MATERIAL, new PhongMaterial( surfaceColor, 0.2, 0.5, 0.4, 32 ) );
root.SetAttribute( PropertyName.COLOR, surfaceColor );
sc.Intersectable = root;
// Background color:
sc.BackgroundColor = new double[] { 0.0, 0.05, 0.07 };
// Camera:
double dist = (0.5 * diameter * correction) / Math.Tan( MathHelper.DegreesToRadians( (float)(0.5 * FoVy) ) );
Vector3d cam = (Vector3d)center - dist * dir;
sc.Camera = new StaticCamera( cam, dir, FoVy );
// Light sources:
sc.Sources = new LinkedList<ILightSource>();
sc.Sources.Add( new AmbientLightSource( 0.8 ) );
Vector3d lightDir = Vector3d.TransformVector( dir, Matrix4d.CreateRotationY( -2.0 ) );
lightDir = Vector3d.TransformVector( lightDir, Matrix4d.CreateRotationZ( -0.8 ) );
sc.Sources.Add( new PointLightSource( (Vector3d)center + diameter * lightDir, 1.0 ) );
return faces;
}
