public Sphere ComputeBoundingSphereNaive()
{
var pointPositions = PointAttributes.FindOrCreate <Vector3>("point_locations");
// FIRST PASS: Find 6 minima/maxima points
BoundingBox box = new BoundingBox();
box.Clear();
foreach (Point point in Points)
{
box.ExtendBy(pointPositions[point]);
}
float maxRadiusSquare = 0.0f;
foreach (Point point in Points)
{
Vector3 p = pointPositions[point];
float radiusSquare = box.Center.DistanceSquared(pointPositions[point]);
if (radiusSquare > maxRadiusSquare)
{
maxRadiusSquare = radiusSquare;
}
}
return(new Sphere(box.Center, (float)System.Math.Sqrt(maxRadiusSquare)));
}
public void Noise(NoiseGenerator noise)
{
ComputePolygonNormals();
ComputePointNormals("point_normals_smooth");
var pointLocations = PointAttributes.FindOrNull <Vector3>("point_locations");
var pointNormals = PointAttributes.FindOrNull <Vector3>("point_normals_smooth");
foreach (Point point in Points)
{
if (
(pointLocations != null) &&
pointLocations.ContainsKey(point)
)
{
var pos = pointLocations[point];
var normal = Vector3.Normalize(pointLocations[point]);
pointLocations[point] = pos + noise.Generate(pos) * normal;
}
}
ComputePolygonCentroids();
ComputePolygonNormals();
SmoothNormalize("corner_normals", "polygon_normals", (2.0f * (float)System.Math.PI));
BuildEdges();
}
public Polygon MakePolygon(List <int> pointIndices)
{
Polygon polygon = MakePolygon();
/* Sanity check */
for (int i = 0; i < pointIndices.Count; ++i)
{
for (int j = 0; j < pointIndices.Count; ++j)
{
if (i == j)
{
continue;
}
if (pointIndices[i] == pointIndices[j])
{
throw new System.Exception("duplicate polygon corner point indices");
}
}
}
foreach (int pointIndex in pointIndices)
{
Point point = Points[pointIndex];
polygon.MakeCorner(point);
}
#if DEBUG_CHECK
var pointLocations = PointAttributes.Find <Vector3>("point_locations");
if (polygon.DebugCheck(pointLocations) == false)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
for (int i = pointIndices.Length - 1; i >= 0; --i)
{
sb.Append(pointIndices[i].ToString());
if (i > 0)
{
sb.Append(", ");
}
}
Logger.Log(sb.ToString() + ");");
}
else
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
for (int i = 0; i < pointIndices.Length; i++)
{
sb.Append(pointIndices[i].ToString());
if (i < pointIndices.Length - 1)
{
sb.Append(", ");
}
}
Logger.Log(sb.ToString() + ");");
}
#endif
return(polygon);
}
/// Compute polygon centroids based on point position attributes
/// Results are stored in internally stored attribute map named "polygon_centroids".
public void ComputePolygonCentroids()
{
var polygonCentroids = PolygonAttributes.FindOrCreate <Vector3>("polygon_centroids");
var pointLocations = PointAttributes.Find <Vector3>("point_locations");
polygonCentroids.Clear();
foreach (Polygon polygon in Polygons)
{
polygon.ComputeCentroid(polygonCentroids, pointLocations);
}
}
/// Compute polygon normals based on point position attributes.
/// Results are stored in internally stored attribute map named "polygon_normals".
public void ComputePolygonNormals()
{
var polygonNormals = PolygonAttributes.FindOrCreate <Vector3>("polygon_normals");
var pointLocations = PointAttributes.Find <Vector3>("point_locations");
polygonNormals.Clear();
foreach (Polygon polygon in Polygons)
{
polygon.ComputeNormal(polygonNormals, pointLocations);
}
}
public Point MakePoint(Vector3 p)
{
Point point = MakePoint();
var pointPositions = PointAttributes.FindOrCreate <Vector3>("point_locations");
#if ENABLE_CREATE_TRANSFORM
pointPositions[point] = MakePointTransform * new Vector3(p.x, p.y, p.z);
#else
pointPositions[point] = new Vector3(p.X, p.Y, p.Z);
#endif
return(point);
}
/// \brief Constructs a new Point and assosiates a position attribute for it.
public Point MakePoint(float x, float y, float z)
{
Point point = MakePoint();
var pointPositions = PointAttributes.FindOrCreate <Vector3>("point_locations");
#if ENABLE_CREATE_TRANSFORM
pointPositions[point] = MakePointTransform * new Vector3(x, y, z);
#else
pointPositions[point] = new Vector3(x, y, z);
#endif
return(point);
}
/// \brief Constructs a new Point and assosiates a position attribute for it.
public Point MakePoint(double x, double y, double z)
{
Point point = MakePoint();
var pointPositions = PointAttributes.FindOrCreate <Vector3>("point_locations");
#if ENABLE_CREATE_TRANSFORM
pointPositions[point] = MakePointTransform * Vector3((float)x, (float)y, (float)z);
#else
pointPositions[point] = new Vector3((float)x, (float)y, (float)z);
#endif
return(point);
}
/// \warning This is inefficient! Try not to use this
public void MergePoints()
{
Dictionary <Point, Point> removedPointToRemainingPoint = new Dictionary <Point, Point>();
var pointLocations = PointAttributes.FindOrNull <Vector3>("point_locations");
float pointEpsilon = 0.0000001f;
// Merge points
foreach (Point p1 in Points)
{
Vector3 pos1 = pointLocations[p1];
bool alreadyUsed = false;
foreach (Point p2 in Points)
{
if (p1 == p2)
{
continue;
}
if (removedPointToRemainingPoint.ContainsKey(p1))
{
continue;
}
Vector3 pos2 = pointLocations[p2];
float distanceSquared = pos1.DistanceSquared(pos2);
if (distanceSquared < pointEpsilon)
{
if (alreadyUsed)
{
System.Diagnostics.Debug.WriteLine("point already used");
}
removedPointToRemainingPoint[p2] = p1;
alreadyUsed = true;
}
}
}
// Merge polygons
foreach (var polygon in Polygons)
{
polygon.ReplacePoints(removedPointToRemainingPoint);
}
foreach (var point in removedPointToRemainingPoint.Keys)
{
Points.Remove(point);
}
}
public void ComputePointNormals(string mapName)
{
var pointNormals = PointAttributes.FindOrCreate <Vector3>(mapName);
var polygonNormals = PolygonAttributes.Find <Vector3>("polygon_normals");
pointNormals.Clear();
foreach (Point point in Points)
{
Vector3 normalSum = new Vector3(0.0f, 0.0f, 0.0f);
foreach (Corner corner in point.Corners)
{
normalSum += polygonNormals[corner.Polygon];
}
Vector3 averageNormal = normalSum / (float)point.Corners.Count;
pointNormals[point] = averageNormal;
}
}
public void Transform(Matrix4 transform)
{
Matrix4 inverseTransposeTransform = Matrix4.Transpose(Matrix4.Invert(transform));
// Check.. Did I forget something?
// \todo Mark each attributemap how they should be transformed
var polygonCentroids = PolygonAttributes.FindOrNull <Vector3>("polygon_centroids");
var polygonNormals = PolygonAttributes.FindOrNull <Vector3>("polygon_normals");
var pointLocations = PointAttributes.FindOrNull <Vector3>("point_locations");
var pointNormals = PointAttributes.FindOrNull <Vector3>("point_normals");
var cornerNormals = CornerAttributes.FindOrNull <Vector3>("corner_normals");
// Make copies of old points
foreach (Point point in Points)
{
if (pointLocations != null && pointLocations.ContainsKey(point))
{
pointLocations[point] = transform.TransformPoint(pointLocations[point]);
}
if (pointNormals != null && pointNormals.ContainsKey(point))
{
pointNormals[point] = inverseTransposeTransform.TransformDirection(pointNormals[point]);
}
}
foreach (Polygon polygon in Polygons)
{
if (polygonCentroids != null && polygonCentroids.ContainsKey(polygon))
{
polygonCentroids[polygon] = transform.TransformPoint(polygonCentroids[polygon]);
}
if (polygonNormals != null && polygonNormals.ContainsKey(polygon))
{
polygonNormals[polygon] = inverseTransposeTransform.TransformDirection(polygonNormals[polygon]);
}
if (cornerNormals != null)
{
foreach (Corner corner in polygon.Corners)
{
if (cornerNormals.ContainsKey(corner))
{
cornerNormals[corner] = inverseTransposeTransform.TransformDirection(cornerNormals[corner]);
}
}
}
}
}
public HeightField(float[,] heights, float scaleX, float scaleZ)
{
var pointLocations = PointAttributes.FindOrCreate <Vector3>("point_locations");
var pointTexcoords = PointAttributes.FindOrCreate <Vector2>("point_texcoords");
// Generate vertices
int xCount = heights.GetLength(0);
int zCount = heights.GetLength(1);
for (int x = 0; x < xCount; x++)
{
float s = (float)x / (float)xCount;
float xP = (float)x * scaleX;
for (int z = 0; z < zCount; z++)
{
float t = (float)z / (float)zCount;
float zP = (float)z * scaleZ;
float yP = heights[x, z];
var point = MakePoint();
pointLocations[point] = new Vector3(xP, yP, zP);
pointTexcoords[point] = new Vector2(s, t);
Points[x * zCount + z] = point;
}
}
// Generate quads
for (int x = 0; x < xCount - 1; x++)
{
for (int z = 0; z < zCount - 1; z++)
{
var pol = MakePolygon();
pol.MakeCorner(Points[(x + 1) * zCount + z]);
pol.MakeCorner(Points[(x + 1) * zCount + z + 1]);
pol.MakeCorner(Points[(x) * zCount + z + 1]);
pol.MakeCorner(Points[(x) * zCount + z]);
}
}
ComputePolygonCentroids();
ComputePolygonNormals();
SmoothNormalize("corner_normals", "polygon_normals", (2.0f * (float)System.Math.PI));
}
public Corner ClosestPolygonCorner(Polygon polygon, Vector3 position)
{
Corner closestCorner = null;
float closestDistanceSquared = float.MaxValue;
var pointLocations = PointAttributes.Find <Vector3>("point_locations");
foreach (Corner corner in polygon.Corners)
{
Vector3 cornerLocation = pointLocations[corner.Point];
float distanceSquared = cornerLocation.DistanceSquared(position);
if (distanceSquared < closestDistanceSquared)
{
closestDistanceSquared = distanceSquared;
closestCorner = corner;
}
}
return(closestCorner);
}
private bool AllInSphere(Vector3 center, ref float radius)
{
var pointPositions = PointAttributes.FindOrCreate <Vector3>("point_locations");
float r2 = radius * radius;
float maxDistanceSquared = 0.0f;
foreach (Point point in Points)
{
float distanceSquared = center.DistanceSquared(pointPositions[point]);
if (distanceSquared > r2)
{
return(false);
}
if (distanceSquared > maxDistanceSquared)
{
maxDistanceSquared = distanceSquared;
}
}
radius = (float)System.Math.Sqrt(maxDistanceSquared);
return(true);
}
/// \brief Construct a new Polygon from a given set of Point indices
/// \param pointIndices Indices to Points that are connected to the new Polygon</param>
/// \return Newly created Polygon
public Polygon MakePolygon(params int[] pointIndices)
{
Polygon polygon = MakePolygon();
foreach (int pointIndex in pointIndices)
{
Point point = Points[pointIndex];
polygon.MakeCorner(point);
}
#if DEBUG_CHECK
var pointLocations = PointAttributes.Find <Vector3>("point_locations");
if (polygon.DebugCheck(pointLocations) == false)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
for (int i = pointIndices.Length - 1; i >= 0; --i)
{
sb.Append(pointIndices[i].ToString());
if (i > 0)
{
sb.Append(", ");
}
}
Logger.Log(sb.ToString() + ");");
}
else
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
for (int i = 0; i < pointIndices.Length; i++)
{
sb.Append(pointIndices[i].ToString());
if (i < pointIndices.Length - 1)
{
sb.Append(", ");
}
}
Logger.Log(sb.ToString() + ");");
}
#endif
return(polygon);
}
public void SmoothAverage(
string cornerAttribute,
string pointNormalName
)
{
var cornerAttributes = CornerAttributes.FindOrCreate <Vector4>(cornerAttribute);
var cornerNormals = CornerAttributes.FindOrCreate <Vector3>("corner_normals");
var pointNormals = PointAttributes.Find <Vector3>(pointNormalName);
var newCornerAttributes = CornerAttributes.FindOrCreate <Vector4>("temp");
foreach (Polygon polygon in Polygons)
{
polygon.SmoothAverage(
newCornerAttributes,
cornerAttributes,
cornerNormals,
pointNormals
);
}
CornerAttributes.Replace(cornerAttribute, "temp");
}
public Cube(Vector3 size, IVector3 div, float p)
{
int x;
int y;
int z;
MakeInfo info = new MakeInfo(0.5f * size, div, p);
info.pointLocations = PointAttributes.FindOrCreate <Vector3>("point_locations");
info.pointNormals = PointAttributes.FindOrCreate <Vector3>("point_normals");
info.pointTexcoords = PointAttributes.FindOrCreate <Vector2>("point_texcoords");
info.cornerNormals = CornerAttributes.FindOrCreate <Vector3>("corner_normals");
info.cornerTexcoords = CornerAttributes.FindOrCreate <Vector2>("corner_texcoords");
info.polygonCentroids = PolygonAttributes.FindOrCreate <Vector3>("polygon_centroids");
info.polygonNormals = PolygonAttributes.FindOrCreate <Vector3>("polygon_normals");
// Generate vertices
// Top and bottom
for (x = -info.Div.X; x <= info.Div.X; x++)
{
float relX = 0.5f + (float)x / info.Size.X;
for (z = -info.Div.Z; z <= info.Div.Z; z++)
{
float relZ = 0.5f + (float)z / info.Size.Z;
MakePoint(info, x, info.Div.Y, z, Vector3.UnitY, relX, relZ);
MakePoint(info, x, -info.Div.Y, z, -Vector3.UnitY, relX, relZ);
}
for (y = -info.Div.Y; y <= info.Div.Y; y++)
{
float relY = 0.5f + (float)y / info.Size.Y;
MakePoint(info, x, y, info.Div.Z, Vector3.UnitZ, relX, relY);
MakePoint(info, x, y, -info.Div.Z, -Vector3.UnitZ, relX, relY);
}
}
// Left and right
for (z = -info.Div.Z; z <= info.Div.Z; z++)
{
float relZ = 0.5f + (float)z / info.Size.Z;
for (y = -info.Div.Y; y <= info.Div.Y; y++)
{
float relY = 0.5f + (float)y / info.Size.Y;
MakePoint(info, info.Div.X, y, z, Vector3.UnitX, relY, relZ);
MakePoint(info, -info.Div.X, y, z, -Vector3.UnitX, relY, relZ);
}
}
// Generate quads
// Top and bottom
for (x = -info.Div.X; x < info.Div.X; x++)
{
float relX1 = 0.5f + (float)x / info.Size.X;
float relX2 = 0.5f + (float)(x + 1) / info.Size.X;
for (z = -info.Div.Z; z < info.Div.Z; z++)
{
float relZ1 = 0.5f + (float)z / info.Size.Z;
float relZ2 = 0.5f + (float)(z + 1) / info.Size.Z;
var top = MakePolygon();
MakeCorner(info, top, x + 1, info.Div.Y, z, Vector3.UnitY, relX2, relZ1);
MakeCorner(info, top, x + 1, info.Div.Y, z + 1, Vector3.UnitY, relX2, relZ2);
MakeCorner(info, top, x, info.Div.Y, z + 1, Vector3.UnitY, relX1, relZ2);
MakeCorner(info, top, x, info.Div.Y, z, Vector3.UnitY, relX1, relZ1);
var bottom = MakePolygon();
MakeCorner(info, bottom, x, -info.Div.Y, z, -Vector3.UnitY, relX1, relZ1);
MakeCorner(info, bottom, x, -info.Div.Y, z + 1, -Vector3.UnitY, relX1, relZ2);
MakeCorner(info, bottom, x + 1, -info.Div.Y, z + 1, -Vector3.UnitY, relX2, relZ2);
MakeCorner(info, bottom, x + 1, -info.Div.Y, z, -Vector3.UnitY, relX2, relZ1);
info.polygonNormals[top] = Vector3.UnitY;
info.polygonNormals[bottom] = -Vector3.UnitY;
}
for (y = -info.Div.Y; y < info.Div.Y; y++)
{
float relY1 = 0.5f + (float)y / info.Size.Y;
float relY2 = 0.5f + (float)(y + 1) / info.Size.Y;
var back = MakePolygon();
MakeCorner(info, back, x, y, info.Div.Z, Vector3.UnitZ, relX1, relY1);
MakeCorner(info, back, x, y + 1, info.Div.Z, Vector3.UnitZ, relX1, relY2);
MakeCorner(info, back, x + 1, y + 1, info.Div.Z, Vector3.UnitZ, relX2, relY2);
MakeCorner(info, back, x + 1, y, info.Div.Z, Vector3.UnitZ, relX2, relY1);
var front = MakePolygon();
MakeCorner(info, front, x + 1, y, -info.Div.Z, -Vector3.UnitZ, relX2, relY1);
MakeCorner(info, front, x + 1, y + 1, -info.Div.Z, -Vector3.UnitZ, relX2, relY2);
MakeCorner(info, front, x, y + 1, -info.Div.Z, -Vector3.UnitZ, relX1, relY2);
MakeCorner(info, front, x, y, -info.Div.Z, -Vector3.UnitZ, relX1, relY1);
info.polygonNormals[back] = Vector3.UnitZ;
info.polygonNormals[front] = -Vector3.UnitZ;
}
}
// Left and right
for (z = -info.Div.Z; z < info.Div.Z; z++)
{
float relZ1 = 0.5f + (float)z / info.Size.Z;
float relZ2 = 0.5f + (float)(z + 1) / info.Size.Z;
for (y = -info.Div.Y; y < info.Div.Y; y++)
{
float relY1 = 0.5f + (float)y / info.Size.Y;
float relY2 = 0.5f + (float)(y + 1) / info.Size.Y;
var right = MakePolygon();
MakeCorner(info, right, info.Div.X, y, z, Vector3.UnitX, relY1, relZ1);
MakeCorner(info, right, info.Div.X, y, z + 1, Vector3.UnitX, relY1, relZ2);
MakeCorner(info, right, info.Div.X, y + 1, z + 1, Vector3.UnitX, relY2, relZ2);
MakeCorner(info, right, info.Div.X, y + 1, z, Vector3.UnitX, relY2, relZ1);
var left = MakePolygon();
MakeCorner(info, left, -info.Div.X, y + 1, z, -Vector3.UnitX, relY2, relZ1);
MakeCorner(info, left, -info.Div.X, y + 1, z + 1, -Vector3.UnitX, relY2, relZ2);
MakeCorner(info, left, -info.Div.X, y, z + 1, -Vector3.UnitX, relY1, relZ2);
MakeCorner(info, left, -info.Div.X, y, z, -Vector3.UnitX, relY1, relZ1);
info.polygonNormals[right] = Vector3.UnitX;
info.polygonNormals[left] = -Vector3.UnitX;
}
}
ComputePolygonCentroids();
}
public SuperEllipsoid(Vector3 radius, double n1, double n2, int sliceCount, int stackDivision)
{
MakeInfo info = new MakeInfo(radius, n1, n2, sliceCount, stackDivision);
info.pointLocations = PointAttributes.FindOrCreate <Vector3>("point_locations");
info.pointNormals = PointAttributes.FindOrCreate <Vector3>("point_normals");
info.pointTexcoords = PointAttributes.FindOrCreate <Vector2>("point_texcoords");
info.polygonCentroids = PolygonAttributes.FindOrCreate <Vector3>("polygon_centroids");
info.polygonNormals = PolygonAttributes.FindOrCreate <Vector3>("polygon_normals");
info.cornerTexcoords = CornerAttributes.FindOrCreate <Vector2>("corner_texcoords");
int slice;
int stack;
for (slice = 0; slice < sliceCount; ++slice)
{
double relSlice = (double)(slice) / (double)(sliceCount);
for (stack = -stackDivision; stack <= stackDivision; ++stack)
{
double relStack = (double)(stack) / (double)(stackDivision + 1);
Point point = MakePoint(info, relSlice, relStack);
info.points.Add(point);
}
}
info.bottom = MakePoint(info, 0.5f, -1.0f);
info.top = MakePoint(info, 0.5f, 1.0f);
#region bottom fan
{
for (slice = 0; slice < sliceCount; ++slice)
{
int nextSlice = (slice + 1);
int stackBase0 = 0;
double relSlice = ((double)(slice) + 0.5) / (double)(sliceCount);
double relStack = -1.0 + (0.5 / (double)(stackDivision + 1));
Point centroid = MakePoint(info, relSlice, relStack);
var polygon = MakePolygon();
#if CCW
MakeCorner(info, polygon, slice, stackBase0);
MakeCorner(info, polygon, slice, info.stackBase0Bottom);
MakeCorner(info, polygon, nextSlice, stackBase0);
#else
MakeCorner(info, polygon, nextSlice, stackBase0);
MakeCorner(info, polygon, slice, info.stackBase0Bottom);
MakeCorner(info, polygon, slice, stackBase0);
#endif
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = info.pointNormals [centroid];
}
}
#endregion
#region middle quads, bottom up
for (
stack = -stackDivision;
stack < stackDivision;
++stack
)
{
int stackBase0 = stack + stackDivision;
int nextStackBase0 = stackBase0 + 1;
double relStack = ((double)(stack) + 0.5) / (double)(stackDivision + 1);
for (slice = 0; slice < sliceCount; ++slice)
{
int nextSlice = (slice + 1);
double relSlice = ((double)(slice) + 0.5) / (double)(sliceCount);
Point centroid = MakePoint(info, relSlice, relStack);
var polygon = MakePolygon();
#if CCW
MakeCorner(info, polygon, nextSlice, nextStackBase0);
MakeCorner(info, polygon, slice, nextStackBase0);
MakeCorner(info, polygon, slice, stackBase0);
MakeCorner(info, polygon, nextSlice, stackBase0);
#else
MakeCorner(info, polygon, nextSlice, stackBase0);
MakeCorner(info, polygon, slice, stackBase0);
MakeCorner(info, polygon, slice, nextStackBase0);
MakeCorner(info, polygon, nextSlice, nextStackBase0);
#endif
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = info.pointNormals [centroid];
}
}
#endregion
#region top fan
for (slice = 0; slice < sliceCount; ++slice)
{
int nextSlice = (slice + 1);
int stackBase0 = stackDivision + stackDivision;
double relSlice = ((double)(slice) + 0.5) / (double)(sliceCount);
double relStack = 1.0 - (0.5 / (double)(stackDivision + 1));
Point centroid = MakePoint(info, relSlice, relStack);
var polygon = MakePolygon();
#if CCW
MakeCorner(info, polygon, slice, info.stackBase0Top);
MakeCorner(info, polygon, slice, stackBase0);
MakeCorner(info, polygon, nextSlice, stackBase0);
#else
MakeCorner(info, polygon, nextSlice, stackBase0);
MakeCorner(info, polygon, slice, stackBase0);
MakeCorner(info, polygon, slice, info.stackBase0Top);
#endif
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = info.pointNormals [centroid];
}
#endregion
}
public Disc(
double outerRadius,
double innerRadius,
int sliceCount,
int stackCount
)
{
MakeInfo info = new MakeInfo(outerRadius, innerRadius, sliceCount, stackCount);
info.pointLocations = PointAttributes.FindOrCreate <Vector3>("point_locations");
info.pointNormals = PointAttributes.FindOrCreate <Vector3>("point_normals");
info.pointTexcoords = PointAttributes.FindOrCreate <Vector2>("point_texcoords");
info.polygonCentroids = PolygonAttributes.FindOrCreate <Vector3>("polygon_centroids");
info.polygonNormals = PolygonAttributes.FindOrCreate <Vector3>("polygon_normals");
info.cornerNormals = CornerAttributes.FindOrCreate <Vector3>("corner_normals");
info.cornerTexcoords = CornerAttributes.FindOrCreate <Vector2>("corner_texcoords");
/* Make points */
for (int stack = 0; stack < stackCount; ++stack)
{
double relStack = (stackCount == 1) ? 1.0 : (double)stack / (double)(stackCount - 1);
for (int slice = 0; slice <= sliceCount; ++slice)
{
double relSlice = (double)slice / (double)sliceCount;
info.points[new KeyValuePair <int, int>(slice, stack)] = MakePoint(info, relSlice, relStack);
}
}
/* Special case without center point */
if (stackCount == 1)
{
Polygon polygon = MakePolygon();
info.polygonCentroids[polygon] = Vector3.Zero;
info.polygonNormals [polygon] = Vector3.UnitZ;
for (int slice = sliceCount - 1; slice >= 0; --slice)
{
MakeCorner(info, polygon, slice, 0);
}
return;
}
/* Make center point if needed */
if (innerRadius == 0.0f)
{
info.center = MakePoint(0.0, 0.0, 0.0);
}
/* Quads/triangles */
for (int stack = 0; stack < stackCount - 1; ++stack)
{
double relStackCentroid = (stackCount == 1) ? 0.5 : (double)stack / (double)(stackCount - 1);
for (int slice = 0; slice < sliceCount; ++slice)
{
double relSliceCentroid = ((double)(slice) + 0.5) / (double)(sliceCount);
Point centroid = MakePoint(info, relSliceCentroid, relStackCentroid);
Polygon polygon = MakePolygon();
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = Vector3.UnitZ;
if ((stack == 0) && (innerRadius == 0.0))
{
Corner tip = MakeCorner(info, polygon, slice, stack);
MakeCorner(info, polygon, slice + 1, stack + 1);
MakeCorner(info, polygon, slice, stack + 1);
Vector2 t1 = info.pointTexcoords[GetPoint(info, slice, stack)];
Vector2 t2 = info.pointTexcoords[GetPoint(info, slice + 1, stack)];
Vector2 averageTexcoord = (t1 + t2) / 2.0f;
info.cornerTexcoords[tip] = averageTexcoord;
}
else
{
MakeCorner(info, polygon, slice + 1, stack + 1);
MakeCorner(info, polygon, slice, stack + 1);
MakeCorner(info, polygon, slice, stack);
MakeCorner(info, polygon, slice + 1, stack);
}
}
}
BuildEdges();
}
public Tube(
IParametricCurve curve,
float radius,
int sliceCount,
int stackCount
)
{
float tStep = 1.0f / 512.0f;
// Compute initial N
Vector3 pos = curve.PositionAt(0.0f);
Vector3 posNext = curve.PositionAt(0.0f + tStep);
Vector3 posNext2 = curve.PositionAt(0.0f + tStep + tStep);
Vector3 d1 = posNext - pos;
Vector3 d2 = (posNext2 - posNext) - d1;
Vector3 T = Vector3.Normalize(d1);
Vector3 N = Vector3.Normalize(d2);
Vector3 B = Vector3.Normalize(Vector3.Cross(T, N));
N = Vector3.Normalize(Vector3.Cross(B, T));
var pointLocations = PointAttributes.FindOrCreate <Vector3>("point_locations");
var pointNormals = PointAttributes.FindOrCreate <Vector3>("point_normals");
var pointTexCoords = PointAttributes.FindOrCreate <Vector2>("point_texcoords");
var cornerNormals = CornerAttributes.FindOrCreate <Vector3>("corner_normals");
//var cornerTexCoords = CornerAttributes.FindOrCreate<Vector2>("corner_texcoords");
/* Other vertices */
List <Point> points = new List <Point>();
for (int stack = 0; stack <= stackCount; ++stack)
{
float t = (float)stack / (float)stackCount;
pos = curve.PositionAt(t);
posNext = curve.PositionAt(t + tStep);
d1 = posNext - pos;
T = Vector3.Normalize(d1);
B = Vector3.Normalize(Vector3.Cross(T, N));
N = Vector3.Normalize(Vector3.Cross(B, T));
for (int slice = 0; slice < sliceCount; ++slice)
{
float relPhi = (float)slice / (float)sliceCount;
float phi = (float)System.Math.PI * 2.0f * relPhi;
float sinPhi = (float)System.Math.Sin(phi);
float cosPhi = (float)System.Math.Cos(phi);
Vector3 v = pos;
v += N * sinPhi * radius;
v += B * cosPhi * radius;
Point point = MakePoint();
pointLocations[point] = v;
pointNormals [point] = N * sinPhi + B * cosPhi;
pointTexCoords[point] = new Vector2(relPhi, t);
points.Add(point);
}
}
/* Bottom parts */
{
Vector3 bottomPosition = curve.PositionAt(0.0f);
Vector3 bottomPositionNext = curve.PositionAt(tStep);
Vector3 bottomTangent = Vector3.Normalize(bottomPosition - bottomPositionNext);
Polygon polygon = MakePolygon();
for (int slice = 0; slice < sliceCount; ++slice)
{
int stack = 0;
int reverseSlice = sliceCount - 1 - slice;
Corner corner = polygon.MakeCorner(
points[(stack * (sliceCount)) + reverseSlice]
);
cornerNormals[corner] = bottomTangent;
}
}
/* Middle quads, t = 0 ... t = 1 */
for (int stack = 0; stack < stackCount; ++stack)
{
int nextStack = stack + 1;
for (int slice = 0; slice < sliceCount; ++slice)
{
int nextSlice = (slice + 1) % sliceCount;
MakePolygon(
points[(nextStack * (sliceCount)) + nextSlice],
points[(nextStack * (sliceCount)) + slice],
points[(stack * (sliceCount)) + slice],
points[(stack * (sliceCount)) + nextSlice]
);
}
}
/* Top parts */
{
Vector3 topPosition = curve.PositionAt(1.0f);
Vector3 topPositionPrev = curve.PositionAt(1.0f - tStep);
Vector3 topTangent = Vector3.Normalize(topPosition - topPositionPrev);
Polygon polygon = MakePolygon();
for (int slice = 0; slice < sliceCount; ++slice)
{
int stack = stackCount;
Corner corner = polygon.MakeCorner(
points[(stack * (sliceCount)) + slice]
);
cornerNormals[corner] = topTangent;
}
}
}
/// \todo Accelerate by sorting along major axis
public void Merge(Geometry other)
{
Dictionary <Point, Point> otherPointsToNewPoints = new Dictionary <Point, Point>();
var pointLocationsSelf = PointAttributes.FindOrNull <Vector3>("point_locations");
var pointLocationsOther = other.PointAttributes.FindOrNull <Vector3>("point_locations");
float pointEpsilon = 0.0001f;
// Merge points
foreach (Point otherPoint in other.Points)
{
Vector3 otherPosition = pointLocationsOther[otherPoint];
bool existingPointCloseEnough = false;
foreach (Point existingPoint in Points)
{
Vector3 existingPosition = pointLocationsSelf[existingPoint];
float distanceSquared = existingPosition.DistanceSquared(otherPosition);
if (distanceSquared < pointEpsilon)
{
existingPointCloseEnough = true;
otherPointsToNewPoints[otherPoint] = existingPoint;
break;
}
}
if (existingPointCloseEnough == false)
{
otherPointsToNewPoints[otherPoint] = MakePoint(otherPosition);
}
}
// Merge polygons
foreach (Polygon otherPolygon in other.Polygons)
{
// Test if we can find at least single matching polygon
Polygon matchingPolygon = null;
foreach (Polygon existingPolygon in Polygons)
{
// Test that all other corners can be found
bool missingCorners = false;
foreach (Corner otherCorner in otherPolygon.Corners)
{
Point newPoint = otherPointsToNewPoints[otherCorner.Point];
bool cornerFound = false;
// Find matching corner
foreach (Corner existingCorner in existingPolygon.Corners)
{
if (newPoint == existingCorner.Point)
{
cornerFound = true;
break;
}
}
// No matching corner found, continue
if (cornerFound == false)
{
missingCorners = true;
break;
}
}
if (missingCorners == true)
{
continue;
}
// No missing corners - polygons match
matchingPolygon = existingPolygon;
break;
}
if (matchingPolygon != null)
{
// There was a matching polygon, delete it and do not create new from other
RemovePolygon(matchingPolygon);
//Polygons.Remove(matchingPolygon);
}
else
{
// There was no match, add new from other
Polygon newPolygon = MakePolygon();
foreach (Corner otherCorner in otherPolygon.Corners)
{
Point otherPoint = otherCorner.Point;
Point newPoint = otherPointsToNewPoints[otherPoint];
newPolygon.MakeCorner(newPoint);
}
}
}
// Finally, remove unused points
HashSet <Point> usedPoints = new HashSet <Point>();
foreach (Polygon polygon in Polygons)
{
foreach (Corner corner in polygon.Corners)
{
usedPoints.Add(corner.Point);
}
}
List <Point> pointsToRemove = new List <Point>();
foreach (Point point in Points)
{
if (usedPoints.Contains(point) == false)
{
pointsToRemove.Add(point);
}
}
foreach (Point pointToRemove in pointsToRemove)
{
Points.Remove(pointToRemove);
}
}
public void MergeFast(Geometry other, Polygon thisPolygon, Polygon otherPolygon)
{
Dictionary <Point, Point> otherPointsToNewPoints = new Dictionary <Point, Point>();
var pointLocationsSelf = PointAttributes.FindOrNull <Vector3>("point_locations");
var pointLocationsOther = other.PointAttributes.FindOrNull <Vector3>("point_locations");
float pointEpsilon = 0.0001f;
// Merge points
foreach (Point otherPoint in other.Points)
{
Vector3 otherPosition = pointLocationsOther[otherPoint];
bool existingPointCloseEnough = false;
foreach (Corner existingCorner in thisPolygon.Corners)
{
Point existingPoint = existingCorner.Point;
Vector3 existingPosition = pointLocationsSelf[existingPoint];
float distanceSquared = existingPosition.DistanceSquared(otherPosition);
if (distanceSquared < pointEpsilon)
{
existingPointCloseEnough = true;
otherPointsToNewPoints[otherPoint] = existingPoint;
break;
}
}
if (existingPointCloseEnough == false)
{
otherPointsToNewPoints[otherPoint] = MakePoint(otherPosition);
}
}
RemovePolygon(thisPolygon);
// Merge polygons
foreach (Polygon otherPolygon2 in other.Polygons)
{
if (otherPolygon != otherPolygon2)
{
Polygon newPolygon = MakePolygon();
foreach (Corner otherCorner in otherPolygon.Corners)
{
Point otherPoint = otherCorner.Point;
Point newPoint = otherPointsToNewPoints[otherPoint];
newPolygon.MakeCorner(newPoint);
}
}
}
// Finally, remove unused points
HashSet <Point> usedPoints = new HashSet <Point>();
foreach (Polygon polygon in Polygons)
{
foreach (Corner corner in polygon.Corners)
{
usedPoints.Add(corner.Point);
}
}
List <Point> pointsToRemove = new List <Point>();
foreach (Point point in Points)
{
if (usedPoints.Contains(point) == false)
{
pointsToRemove.Add(point);
}
}
foreach (Point pointToRemove in pointsToRemove)
{
Points.Remove(pointToRemove);
}
}
public void Geodesate(float radius)
{
float rInv = 1.0f / radius;
var polygonCentroids = PolygonAttributes.FindOrNull <Vector3>("polygon_centroids");
var polygonNormals = PolygonAttributes.FindOrNull <Vector3>("polygon_normals");
var pointLocations = PointAttributes.FindOrNull <Vector3>("point_locations");
var pointNormals = PointAttributes.FindOrNull <Vector3>("point_normals");
var cornerNormals = CornerAttributes.FindOrNull <Vector3>("corner_normals");
// Make copies of old points
foreach (Point point in Points)
{
if (
(pointLocations != null) &&
pointLocations.ContainsKey(point)
)
{
Vector3 newNormal = Vector3.Normalize(pointLocations[point]);
pointLocations[point] = radius * newNormal;
if (
(pointNormals != null) &&
pointNormals.ContainsKey(point)
)
{
pointNormals[point] = newNormal;
}
}
}
foreach (Polygon polygon in Polygons)
{
if (
(polygonCentroids != null) &&
polygonCentroids.ContainsKey(polygon)
)
{
Vector3 newNormalizedCentroid = Vector3.Normalize(polygonCentroids[polygon]);
polygonCentroids[polygon] = radius * newNormalizedCentroid;
if (
(polygonNormals != null) &&
polygonNormals.ContainsKey(polygon)
)
{
polygonNormals[polygon] = newNormalizedCentroid;
}
}
if (cornerNormals != null)
{
foreach (Corner corner in polygon.Corners)
{
if (
cornerNormals.ContainsKey(corner)
)
{
if (pointNormals.ContainsKey(corner.Point))
{
cornerNormals[corner] = pointNormals[corner.Point];
}
else if (pointLocations.ContainsKey(corner.Point))
{
cornerNormals[corner] = pointLocations[corner.Point] * rInv;
}
}
}
}
}
}
public Sphere ComputeBoundingSphereRitter()
{
// An Efficient Bounding Sphere
// by Jack Ritter
// from "Graphics Gems", Academic Press, 1990
// Routine to calculate near-optimal bounding
// sphere over a set of points in 3D
// Code written by Jack Ritter and Lyle Rains.
var pointPositions = PointAttributes.FindOrCreate <Vector3>("point_locations");
// FIRST PASS: Find 6 minima/maxima points
Vector3 xmin, xmax, ymin, ymax, zmin, zmax;
xmin = ymin = zmin = Vector3.MaxValue;
xmax = ymax = zmax = Vector3.MinValue;
foreach (Point point in Points)
{
Vector3 p = pointPositions[point];
if (p.X < xmin.X)
{
xmin = p;
}
if (p.X > xmax.X)
{
xmax = p;
}
if (p.Y < ymin.Y)
{
ymin = p;
}
if (p.Y > ymax.Y)
{
ymax = p;
}
if (p.Z < zmin.Z)
{
zmin = p;
}
if (p.Z > zmax.Z)
{
zmax = p;
}
}
// Set span.X = distance between the 2 points xmin & xmax (squared)
Vector3 span;
Vector3 d;
d.X = xmax.X - xmin.X;
d.Y = xmax.Y - xmin.Y;
d.Z = xmax.Z - xmin.Z;
span.X = d.LengthSquared;
// Same for Y & Z spans
d.X = ymax.X - ymin.X;
d.Y = ymax.Y - ymin.Y;
d.Z = ymax.Z - ymin.Z;
span.Y = d.LengthSquared;
d.X = zmax.X - zmin.X;
d.Y = zmax.Y - zmin.Y;
d.Z = zmax.Z - zmin.Z;
span.Z = d.LengthSquared;
// Set points dia1 & dia2 to the maximally separated pair
Vector3 dia1 = xmin;
Vector3 dia2 = xmax; // Assume xspan biggest
float maxspan = span.X;
if (span.Y > maxspan)
{
maxspan = span.Y;
dia1 = ymin;
dia2 = ymax;
}
if (span.Z > maxspan)
{
dia1 = zmin;
dia2 = zmax;
}
// dia1, dia2 is a diameter of initial sphere
// Calculate initial center
Vector3 cen = (dia1 + dia2) / 2.0f;
// Calculate initial radius^2 and radius
d = dia2 - cen; // Radius vector
float rad_sq = d.LengthSquared;;
float rad = d.LengthSquared;
// SECOND PASS: Increment current sphere
foreach (Point point in Points)
{
Vector3 p = pointPositions[point];
d = p - cen;
float old_to_p_sq = d.LengthSquared;
// Do r^2 test first
if (old_to_p_sq > rad_sq)
{
// This point is outside of current sphere
float old_to_p = (float)System.Math.Sqrt(old_to_p_sq);
// Calc radius of new sphere
rad = (rad + old_to_p) / 2.0f;
// For next r^2 compare
rad_sq = rad * rad;
float old_to_new = old_to_p - rad;
// Calculate center of new sphere
cen = (rad * cen + old_to_new * p) / old_to_p;
// Suppress if desired
#if false
System.Diagnostics.Debug.WriteLine(
" New sphere: cen,rad = "
+ cen.ToString() + " " + rad
);
#endif
}
}
// THIRD PASS: Adjust the sphere along major axis for potential improvements
Sphere s = new Sphere(cen, rad);
AdjustBoundingSphere(ref s, -Vector3.UnitX);
AdjustBoundingSphere(ref s, Vector3.UnitX);
AdjustBoundingSphere(ref s, -Vector3.UnitY);
AdjustBoundingSphere(ref s, Vector3.UnitY);
AdjustBoundingSphere(ref s, -Vector3.UnitZ);
AdjustBoundingSphere(ref s, Vector3.UnitZ);
return(s);
}
public Cone(
double minX,
double maxX,
double bottomRadius,
double topRadius,
bool useBottom,
bool useTop,
int sliceCount,
int stackDivision
)
{
MakeInfo info = new MakeInfo(minX, maxX, bottomRadius, topRadius, useBottom, useTop, sliceCount, stackDivision);
info.pointLocations = PointAttributes.FindOrCreate <Vector3>("point_locations");
info.pointNormals = PointAttributes.FindOrCreate <Vector3>("point_normals");
info.pointTexcoords = PointAttributes.FindOrCreate <Vector2>("point_texcoords");
info.polygonCentroids = PolygonAttributes.FindOrCreate <Vector3>("polygon_centroids");
info.polygonNormals = PolygonAttributes.FindOrCreate <Vector3>("polygon_normals");
info.cornerNormals = CornerAttributes.FindOrCreate <Vector3>("corner_normals");
info.cornerTexcoords = CornerAttributes.FindOrCreate <Vector2>("corner_texcoords");
/* Other vertices */
for (int slice = 0; slice <= sliceCount; ++slice)
{
double relSlice = (double)slice / (double)sliceCount;
for (int stack = -stackDivision - info.bottomNotSingular; stack <= stackDivision + info.topNotSingular; ++stack)
{
double relStack = (double)stack / (double)(stackDivision + 1);
info.points[new KeyValuePair <int, int>(slice, stack)] = ConePoint(info, relSlice, relStack);
}
}
/* Bottom parts */
if (bottomRadius == 0.0)
{
info.bottom = MakePoint(minX, 0.0, 0.0); /* apex */
for (int slice = 0; slice < sliceCount; ++slice)
{
int stack = -stackDivision; // second last stack, bottom is -stackDivision - 1
double relSliceCentroid = ((double)slice + 0.5) / (double)sliceCount;
double relStackCentroid = -1.0 + (0.5 / (double)(stackDivision + 1));
Point centroid = ConePoint(info, relSliceCentroid, relStackCentroid);
Polygon polygon = MakePolygon();
MakeCorner(info, polygon, slice + 1, stack);
MakeCorner(info, polygon, slice, stack);
Corner tip = MakeCorner(info, polygon, slice, -stackDivision - 1);
Vector3 n1 = info.pointNormals[GetPoint(info, slice, stack)];
Vector3 n2 = info.pointNormals[GetPoint(info, slice + 1, stack)];
Vector3 averageNormal = Vector3.Normalize(n1 + n2);
info.cornerNormals[tip] = averageNormal;
Vector2 t1 = info.pointTexcoords[GetPoint(info, slice, stack)];
Vector2 t2 = info.pointTexcoords[GetPoint(info, slice + 1, stack)];
Vector2 averageTexCoord = (t1 + t2) / 2.0f;
info.cornerTexcoords[tip] = averageTexCoord;
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = info.pointNormals [centroid];
}
}
else
{
if (useBottom == true)
{
Polygon polygon = MakePolygon();
info.polygonCentroids[polygon] = new Vector3((float)minX, 0.0f, 0.0f);
info.polygonNormals [polygon] = new Vector3(-1.0f, 0.0f, 0.0f);
for (int slice = 0; slice < sliceCount; ++slice)
{
int reverseSlice = sliceCount - 1 - slice;
MakeCorner(info, polygon, reverseSlice, -stackDivision - 1, true);
}
}
}
/* Middle quads, bottom up */
for (
int stack = -stackDivision - info.bottomNotSingular;
stack < stackDivision + info.topNotSingular;
++stack
)
{
double relStackCentroid = ((double)stack + 0.5) / (double)(stackDivision + 1);
for (int slice = 0; slice < sliceCount; ++slice)
{
double relSliceCentroid = ((double)(slice) + 0.5) / (double)(sliceCount);
Point centroid = ConePoint(info, relSliceCentroid, relStackCentroid);
Polygon polygon = MakePolygon();
MakeCorner(info, polygon, slice + 1, stack + 1);
MakeCorner(info, polygon, slice, stack + 1);
MakeCorner(info, polygon, slice, stack);
MakeCorner(info, polygon, slice + 1, stack);
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = info.pointNormals [centroid];
}
}
/* Top parts */
if (topRadius == 0.0)
{
info.top = MakePoint(maxX, 0.0, 0.0); /* apex */
for (int slice = 0; slice < sliceCount; ++slice)
{
int stack = stackDivision;
double relSliceCentroid = ((double)(slice) + 0.5) / (double)(sliceCount);
double relStackCentroid = 1.0 - (0.5 / (double)(stackDivision + 1));
Point centroid = ConePoint(info, relSliceCentroid, relStackCentroid);
Polygon polygon = MakePolygon();
Corner tip = MakeCorner(info, polygon, slice, stackDivision + 1);
MakeCorner(info, polygon, slice, stack);
MakeCorner(info, polygon, slice + 1, stack);
Vector3 n1 = info.pointNormals[GetPoint(info, slice, stack)];
Vector3 n2 = info.pointNormals[GetPoint(info, slice + 1, stack)];
Vector3 averageNormal = Vector3.Normalize(n1 + n2);
info.cornerNormals[tip] = averageNormal;
Vector2 t1 = info.pointTexcoords[GetPoint(info, slice, stack)];
Vector2 t2 = info.pointTexcoords[GetPoint(info, slice + 1, stack)];
Vector2 averageTexcoord = (t1 + t2) / 2.0f;
info.cornerTexcoords[tip] = averageTexcoord;
info.polygonCentroids[polygon] = info.pointLocations[centroid];
info.polygonNormals [polygon] = info.pointNormals [centroid];
}
}
else
{
if (useTop == true)
{
Polygon polygon = MakePolygon();
info.polygonCentroids[polygon] = new Vector3((float)maxX, 0.0f, 0.0f);
info.polygonNormals [polygon] = new Vector3(1.0f, 0.0f, 0.0f);
for (int slice = 0; slice < sliceCount; ++slice)
{
MakeCorner(info, polygon, slice, stackDivision + 1, true);
}
}
}
//MergePoints();
}
