/// <summary>
/// Creates a new rotation transformation that aligns <paramref name="a"/> with <paramref name="b"/>.
/// </summary>
/// <param name="a">The vector that should be aligned with <paramref name="b"/>.</param>
/// <param name="b">The reference vector.</param>
/// <returns>A <see cref="Transform3D"/> such that applying this transform to <paramref name="a"/> returns <paramref name="b"/> and the determinant of the transformation is 1.</returns>
public static Transform3D RotationToAlignAWithB(NormalizedVector3D a, NormalizedVector3D b)
{
double[,] matrix3x3 = Matrix3D.RotationToAlignAWithB(a, b);
return(new Transform3D(new double[, ] {
{ matrix3x3[0, 0], matrix3x3[0, 1], matrix3x3[0, 2], 0 }, { matrix3x3[1, 0], matrix3x3[1, 1], matrix3x3[1, 2], 0 }, { matrix3x3[2, 0], matrix3x3[2, 1], matrix3x3[2, 2], 0 }, { 0, 0, 0, 1 }
}));
}
/// <inheritdoc/>
public Camera[] GetCameras()
{
if (this.LensWidth == 0 || this.SamplingPoints == 1)
{
return(new Camera[] { this });
}
else
{
NormalizedVector3D xAxis = (this.Direction ^ this.RotationReference).Normalize();
Camera[] tbr = new Camera[this.SamplingPoints];
for (int i = 0; i < this.SamplingPoints; i++)
{
double r = ((double)i / (this.SamplingPoints - 1)) * this.LensWidth;
double theta = (double)i / (this.SamplingPoints - 1) * 2 * Math.PI * (this.SamplingPoints / 3.7);
double x = r * Math.Cos(theta);
double y = r * Math.Sin(theta);
Point3D pt = this.Position + x * xAxis + y * this.RotationReference;
tbr[i] = new PerspectiveCamera(pt, this.Direction, this.Distance, this.Size, this.ScaleFactor, this.RotationReference, this.Origin);
}
return(tbr);
}
}
/// <summary>
/// Creates a new <see cref="MaskedLightSource"/> using the specified <paramref name="triangulatedMask"/>.
/// </summary>
/// <param name="intensity">The base intensity of the light.</param>
/// <param name="position">The position of the light source.</param>
/// <param name="direction">The direction of the light.</param>
/// <param name="distance">The distance between the light source and the mask plane.</param>
/// <param name="triangulatedMask">A collection of <see cref="GraphicsPath"/>s representing the transparent part of the mask. Each <see cref="GraphicsPath"/> should represent a single triangle.</param>
/// <param name="maskOrientation">An angle in radians determining the orientation of the 2D mask in the mask plane.</param>
public MaskedLightSource(double intensity, Point3D position, NormalizedVector3D direction, double distance, IEnumerable <GraphicsPath> triangulatedMask, double maskOrientation)
{
this.Intensity = intensity;
this.Position = position;
this.Direction = direction;
this.Distance = distance;
this.Origin = this.Position + distance * this.Direction;
double[,] rotation = Matrix3D.RotationToAlignWithZ(direction).Inverse();
double[,] rotation2 = Matrix3D.RotationAroundAxis(direction, maskOrientation);
List <Point3D[]> maskList = new List <Point3D[]>();
foreach (GraphicsPath trianglePath in triangulatedMask)
{
Point3D[] triangle = new Point3D[3];
List <Point> points = trianglePath.GetPoints().First();
for (int i = 0; i < 3; i++)
{
triangle[i] = (Point3D)((Vector3D)(rotation2 * (rotation * new Point3D(points[i].X, points[i].Y, 0))) + Origin);
}
maskList.Add(triangle);
}
this.TriangulatedMask = maskList;
}
/// <summary>
/// Creates a new <see cref="OrthographicCamera"/> instance.
/// </summary>
/// <param name="position">The position of the centre of the camera plane.</param>
/// <param name="direction">The direction towards which the camera is pointing.</param>
/// <param name="viewSize">The size of the image produced by the camera.</param>
/// <param name="scaleFactor">The scale factor used to convert camera plane units into 2D units.</param>
public OrthographicCamera(Point3D position, NormalizedVector3D direction, Size viewSize, double scaleFactor)
{
this.Position = position;
this.Direction = direction;
this.RotationMatrix = Matrix3D.RotationToAlignWithZ(direction);
this.ScaleFactor = scaleFactor;
this.TopLeft = new Point(-viewSize.Width * 0.5 * ScaleFactor, -viewSize.Height * 0.5 * ScaleFactor);
this.Size = new Size(viewSize.Width * ScaleFactor, viewSize.Height * ScaleFactor);
this.OrbitOrigin = position + direction * ((Vector3D)position).Modulus;
if (new Vector3D(0, 1, 0) * this.Direction < 1)
{
this.RotationReference = (new Vector3D(0, 1, 0) - (new Vector3D(0, 1, 0) * this.Direction) * this.Direction).Normalize();
}
else
{
this.RotationReference = (new Vector3D(0, 0, 1) - (new Vector3D(0, 0, 1) * this.Direction) * this.Direction).Normalize();
}
Point3D rotatedY = this.RotationMatrix * (Point3D)(Vector3D)this.RotationReference;
double rotationAngle = Math.PI / 2 - Math.Atan2(rotatedY.Y, rotatedY.X);
this.CameraRotationMatrix = Matrix3D.RotationAroundAxis(new NormalizedVector3D(0, 0, 1), rotationAngle);
}
private static (byte R, byte G, byte B, byte A) GetPixelColor(Triangle3DElement triangle, Point3D correspPoint, Camera camera, List <ILightSource> lights, List <double> obstructions)
{
NormalizedVector3D normal = triangle.GetNormalAt(correspPoint);
byte R = 0;
byte G = 0;
byte B = 0;
byte A = 0;
for (int i = 0; i < triangle.Fill.Count; i++)
{
Colour col = triangle.Fill[i].GetColour(correspPoint, normal, camera, lights, obstructions);
if (col.A == 1)
{
R = (byte)(col.R * 255);
G = (byte)(col.G * 255);
B = (byte)(col.B * 255);
A = (byte)(col.A * 255);
}
else
{
BlendFront(ref R, ref G, ref B, ref A, (byte)(col.R * 255), (byte)(col.G * 255), (byte)(col.B * 255), (byte)(col.A * 255));
}
}
return(R, G, B, A);
}
/// <inheritdoc/>
public override void Orbit(double theta, double phi)
{
Vector3D vect = this.Position - this.OrbitOrigin;
NormalizedVector3D yAxis = new NormalizedVector3D(0, 1, 0);
NormalizedVector3D xAxis = (this.Direction ^ (Vector3D)yAxis).Normalize();
phi *= Math.Sign(Math.Atan2(xAxis.Z, xAxis.X));
theta *= Math.Sign(yAxis * this.RotationReference);
double[,] thetaRotation = Matrix3D.RotationAroundAxis(yAxis, theta);
double[,] phiRotation = Matrix3D.RotationAroundAxis(xAxis, phi);
Vector3D rotatedVect = (Vector3D)(phiRotation * (thetaRotation * (Point3D)vect));
this.Position = this.OrbitOrigin + rotatedVect;
this.Direction = (this.OrbitOrigin - this.Position).Normalize();
this.RotationReference = ((Vector3D)(phiRotation * (thetaRotation * (Point3D)(Vector3D)this.RotationReference))).Normalize();
this.RotationMatrix = Matrix3D.RotationToAlignWithZ(this.Direction);
Point3D rotatedY = this.RotationMatrix * (Point3D)(Vector3D)this.RotationReference;
double rotationAngle = Math.PI / 2 - Math.Atan2(rotatedY.Y, rotatedY.X);
this.CameraRotationMatrix = Matrix3D.RotationAroundAxis(new NormalizedVector3D(0, 0, 1), rotationAngle);
}
/// <inheritdoc/>
public override Point3D Deproject(Point point, Line3DElement line)
{
Point3D rotatedPoint = new Point3D(point.X / ScaleFactor, point.Y / ScaleFactor, 0);
Point3D projectedPoint = RotationMatrix.Inverse() * (CameraRotationMatrix.Inverse() * rotatedPoint);
Point3D cameraPlanePoint = projectedPoint + (Vector3D)this.Position;
NormalizedVector3D v = this.Direction;
NormalizedVector3D l = (line[1] - line[0]).Normalize();
double t;
if (v.X * l.Y - v.Y * l.X != 0)
{
t = (l.X * (cameraPlanePoint.Y - line[0].Y) - l.Y * (cameraPlanePoint.X - line[0].X)) / (v.X * l.Y - v.Y * l.X);
}
else if (v.Z * l.Y - v.Y * l.Z != 0)
{
t = (l.Z * (cameraPlanePoint.Y - line[0].Y) - l.Y * (cameraPlanePoint.Z - line[0].Z)) / (v.Z * l.Y - v.Y * l.Z);
}
else if (v.Z * l.X - v.X * l.Z != 0)
{
t = (l.Z * (cameraPlanePoint.X - line[0].X) - l.X * (cameraPlanePoint.Z - line[0].Z)) / (v.Z * l.X - v.X * l.Z);
}
else
{
throw new Exception("The lines do not intersect!");
}
Point3D pt = cameraPlanePoint + v * t;
return(pt);
}
public static double[,] RotationToAlignAWithB(NormalizedVector3D a, NormalizedVector3D b)
{
double c = a * b;
if (c != -1)
{
Vector3D v = a ^ b;
c = 1 / (1 + c);
return(new double[3, 3]
{
{ 1 - (v.Y * v.Y - v.Z * v.Z) * c, (v.X * v.Y) * c - v.Z, (v.X * v.Z) * c + v.Y },
{ (v.X * v.Y) * c + v.Z, 1 + (-v.X * v.X - v.Z * v.Z) * c, (v.Y * v.Z) * c - v.X },
{ (v.X * v.Z) * c - v.Y, (v.Y * v.Z) * c + v.X, 1 + (-v.X * v.X - v.Y * v.Y) * c }
});
}
else
{
if (a.X != 0 || a.Z != 0)
{
NormalizedVector3D p = new NormalizedVector3D(-a.Z, 0, a.X);
return(RotationAroundAxis(p, Math.PI));
}
else //a.Y != 0
{
NormalizedVector3D p = new NormalizedVector3D(0, a.Z, -a.Y);
return(RotationAroundAxis(p, Math.PI));
}
}
}
/// <summary>
/// Creates a new transformation corresponding to a rotation around a specified axis.
/// </summary>
/// <param name="axis">The axis around which to rotate.</param>
/// <param name="theta">The rotation angle in radians.</param>
/// <returns>A <see cref="Transform3D"/> corresponding to the specified rotation.</returns>
public static Transform3D RotationAlongAxis(NormalizedVector3D axis, double theta)
{
double[,] matrix3x3 = Matrix3D.RotationAroundAxis(axis, theta);
return(new Transform3D(new double[, ] {
{ matrix3x3[0, 0], matrix3x3[0, 1], matrix3x3[0, 2], 0 }, { matrix3x3[1, 0], matrix3x3[1, 1], matrix3x3[1, 2], 0 }, { matrix3x3[2, 0], matrix3x3[2, 1], matrix3x3[2, 2], 0 }, { 0, 0, 0, 1 }
}));
}
/// <summary>
/// Creates a new <see cref="SpotlightLightSource"/> instance.
/// </summary>
/// <param name="intensity">The intensity of the light.</param>
/// <param name="position">The position of the light source.</param>
/// <param name="direction">The direction of the cone's axis.</param>
/// <param name="beamWidthAngle">The angular size of the light cone, in radians.</param>
/// <param name="cutoffAngle">The angular size of the cutoff cone, in radians.</param>
public SpotlightLightSource(double intensity, Point3D position, NormalizedVector3D direction, double beamWidthAngle, double cutoffAngle)
{
this.Position = position;
this.Direction = direction;
this.Intensity = intensity;
this.BeamWidthAngle = beamWidthAngle;
this.CutoffAngle = cutoffAngle;
}
public static double[,] RotationAroundAxis(NormalizedVector3D axis, double theta)
{
double cos = Math.Cos(theta);
double sin = Math.Sin(theta);
return(new double[3, 3]
{
{ cos + axis.X * axis.X * (1 - cos), axis.X *axis.Y *(1 - cos) - axis.Z * sin, axis.X *axis.Z *(1 - cos) + axis.Y * sin },
{ axis.Y *axis.X *(1 - cos) + axis.Z * sin, cos + axis.Y * axis.Y * (1 - cos), axis.Y *axis.Z *(1 - cos) - axis.X * sin },
{ axis.Z *axis.X *(1 - cos) - axis.Y * sin, axis.Z *axis.Y *(1 - cos) + axis.X * sin, cos + axis.Z * axis.Z * (1 - cos) }
});
}
/// <summary>
/// Creates a new <see cref="AreaLightSource"/> instance.
/// </summary>
/// <param name="intensity">The base intensity of the light.</param>
/// <param name="center">The centre of the light-emitting area.</param>
/// <param name="radius">The radius of the light-emitting area.</param>
/// <param name="penumbraRadius">The radius of the penumbra area.</param>
/// <param name="direction">The direction of the light.</param>
/// <param name="sourceDistance">The distance between the focal point of the light and the light's center.</param>
/// <param name="shadowSamplingPointCount">The number of points to use when determining the amount of light that is obstructed at a certain point.</param>
public AreaLightSource(double intensity, Point3D center, double radius, double penumbraRadius, NormalizedVector3D direction, double sourceDistance, int shadowSamplingPointCount)
{
if (shadowSamplingPointCount < 1)
{
throw new ArgumentOutOfRangeException(nameof(shadowSamplingPointCount), shadowSamplingPointCount, "The number of shadow sampling points must be greater than or equal to 1!");
}
this.Center = center;
this.Direction = direction;
this.Intensity = intensity;
this.Radius = radius;
this.PenumbraRadius = penumbraRadius;
this.SourceDistance = sourceDistance;
this.VirtualSource = this.Center - this.Direction * this.SourceDistance;
this.ShadowSamplingPointCount = shadowSamplingPointCount;
NormalizedVector3D yAxis;
if (Math.Abs(new Vector3D(0, 1, 0) * this.Direction) < 1)
{
yAxis = (new Vector3D(0, 1, 0) - (new Vector3D(0, 1, 0) * this.Direction) * this.Direction).Normalize();
}
else
{
yAxis = (new Vector3D(0, 0, 1) - (new Vector3D(0, 0, 1) * this.Direction) * this.Direction).Normalize();
}
NormalizedVector3D xAxis = (this.Direction ^ yAxis).Normalize();
this.ShadowSamplingPoints = new Point3D[shadowSamplingPointCount - 1];
for (int i = 0; i < shadowSamplingPointCount - 1; i++)
{
double r = ((double)i / (shadowSamplingPointCount - 2)) * this.Radius;
double theta = (double)i / (shadowSamplingPointCount - 2) * 2 * Math.PI * ((shadowSamplingPointCount - 1) / 3.7);
double x = r * Math.Cos(theta);
double y = r * Math.Sin(theta);
Point3D pt = this.Center + x * xAxis + y * yAxis;
this.ShadowSamplingPoints[i] = pt;
}
}
/// <inheritdoc/>
public double GetObstruction(Point3D point, IEnumerable <Triangle3DElement> shadowingTriangles)
{
Vector3D reverseDir = this.Position - point;
double maxD = reverseDir.Modulus;
NormalizedVector3D reverseDirNorm = new NormalizedVector3D(reverseDir.X / maxD, reverseDir.Y / maxD, reverseDir.Z / maxD, false);
foreach (Triangle3DElement triangle in shadowingTriangles)
{
Point3D?projected = triangle.ProjectOnThisPlane(point, reverseDirNorm, true, maxD);
if (projected != null && Intersections3D.PointInTriangle(projected.Value, triangle.Point1, triangle.Point2, triangle.Point3))
{
return(1);
}
}
return(0);
}
private static (byte R, byte G, byte B, byte A) GetPixelColorWithShadow(Triangle3DElement triangle, List <ILightSource> lights, IEnumerable <Triangle3DElement> shadowers, Point3D correspPoint, Camera camera)
{
List <double> pixelObstructions = new List <double>(lights.Count);
for (int i = 0; i < lights.Count; i++)
{
if (!lights[i].CastsShadow)
{
pixelObstructions.Add(0);
}
else
{
pixelObstructions.Add(lights[i].GetObstruction(correspPoint, from el in shadowers where el != triangle select el));
}
}
byte R = 0;
byte G = 0;
byte B = 0;
byte A = 0;
NormalizedVector3D normal = triangle.GetNormalAt(correspPoint);
for (int i = 0; i < triangle.Fill.Count; i++)
{
Colour col = triangle.Fill[i].GetColour(correspPoint, normal, camera, lights, pixelObstructions);
if (col.A == 1)
{
R = (byte)(col.R * 255);
G = (byte)(col.G * 255);
B = (byte)(col.B * 255);
A = (byte)(col.A * 255);
}
else
{
BlendFront(ref R, ref G, ref B, ref A, (byte)(col.R * 255), (byte)(col.G * 255), (byte)(col.B * 255), (byte)(col.A * 255));
}
}
return(R, G, B, A);
}
/// <summary>
/// Applies the transformation to a <see cref="Triangle3DElement"/>.
/// </summary>
/// <param name="triangle">The <see cref="Triangle3DElement"/> to which the transformation should be applied.</param>
/// <returns>A <see cref="Triangle3DElement"/> corresponding to a triangle in which the transformation has been applied to the points from <paramref name="triangle" />. Properties are preserved between the two elements.</returns>
public Triangle3DElement Apply(Triangle3DElement triangle)
{
Point3D p1 = this.Apply(triangle.Point1);
Point3D p2 = this.Apply(triangle.Point2);
Point3D p3 = this.Apply(triangle.Point3);
if (!triangle.IsFlat)
{
Point3D p1Ref = triangle.Point1 + (Vector3D)triangle.Point1Normal;
Point3D p2Ref = triangle.Point2 + (Vector3D)triangle.Point2Normal;
Point3D p3Ref = triangle.Point3 + (Vector3D)triangle.Point3Normal;
p1Ref = this.Apply(p1Ref);
p2Ref = this.Apply(p2Ref);
p3Ref = this.Apply(p3Ref);
NormalizedVector3D n1 = (p1Ref - p1).Normalize();
NormalizedVector3D n2 = (p2Ref - p2).Normalize();
NormalizedVector3D n3 = (p3Ref - p3).Normalize();
Triangle3DElement tbr = new Triangle3DElement(p1, p2, p3, n1, n2, n3)
{
CastsShadow = triangle.CastsShadow, ReceivesShadow = triangle.ReceivesShadow, Tag = triangle.Tag, ZIndex = triangle.ZIndex
};
tbr.Fill.AddRange(triangle.Fill);
return(tbr);
}
else
{
Triangle3DElement tbr = new Triangle3DElement(p1, p2, p3)
{
CastsShadow = triangle.CastsShadow, ReceivesShadow = triangle.ReceivesShadow, Tag = triangle.Tag, ZIndex = triangle.ZIndex
};
tbr.Fill.AddRange(triangle.Fill);
return(tbr);
}
}
public static double[,] RotationToAlignWithZ(NormalizedVector3D vector, bool preferY = true)
{
if (vector.Z != -1)
{
Vector3D v = new Vector3D(vector.Y, -vector.X, 0);
double c = 1 / (1 + vector.Z);
return(new double[3, 3]
{
{ 1 - v.Y * v.Y * c, v.X *v.Y *c, v.Y },
{ v.X *v.Y *c, 1 - v.X *v.X *c, -v.X },
{ -v.Y, v.X, 1 - v.X * v.X * c - v.Y * v.Y * c }
});
}
else
{
if (!preferY)
{
return(new double[3, 3]
{
{ 1, 0, 0 },
{ 0, -1, 0 },
{ 0, 0, -1 }
});
}
else
{
return(new double[3, 3]
{
{ -1, 0, 0 },
{ 0, 1, 0 },
{ 0, 0, -1 }
});
}
}
}
private PerspectiveCamera(Point3D position, NormalizedVector3D direction, double distance, Size viewSize, double scaleFactor, NormalizedVector3D rotationReference, Point3D origin2DReference)
{
this.Position = position;
this.Direction = direction;
this.Distance = distance;
this.Origin2DReference = origin2DReference;
this.Origin = position + direction * distance;
this.RotationMatrix = Matrix3D.RotationToAlignWithZ(direction);
this.ScaleFactor = scaleFactor;
this.TopLeft = new Point(-viewSize.Width * 0.5 * ScaleFactor, -viewSize.Height * 0.5 * ScaleFactor);
this.Size = new Size(viewSize.Width * ScaleFactor, viewSize.Height * ScaleFactor);
this.OrbitOrigin = position + direction * ((Vector3D)position).Modulus;
this.RotationReference = rotationReference;
Point3D rotatedY = this.RotationMatrix * (Point3D)(Vector3D)this.RotationReference;
double rotationAngle = Math.PI / 2 - Math.Atan2(rotatedY.Y, rotatedY.X);
this.CameraRotationMatrix = Matrix3D.RotationAroundAxis(new NormalizedVector3D(0, 0, 1), rotationAngle);
}
private IEnumerable <Element3D> Resample(Camera camera, Element3D element, double maxSize)
{
if (element is Point3DElement)
{
yield return(element);
}
else if (element is Line3DElement line)
{
if (this.ResampleLines)
{
Point p1 = camera.Project(line.Point1);
Point p2 = camera.Project(line.Point2);
if ((p1.X - p2.X) * (p1.X - p2.X) + (p1.Y - p2.Y) * (p1.Y - p2.Y) > maxSize)
{
Point3D half = (Point3D)(((Vector3D)line.Point1 + (Vector3D)line.Point2) * 0.5);
Line3DElement line1 = new Line3DElement(line.Point1, half)
{
Colour = line.Colour, LineCap = line.LineCap, LineDash = line.LineDash, Tag = line.Tag, Thickness = line.Thickness, ZIndex = line.ZIndex
};
Line3DElement line2 = new Line3DElement(half, line.Point2)
{
Colour = line.Colour, LineCap = line.LineCap, LineDash = line.LineDash, Tag = line.Tag, Thickness = line.Thickness, ZIndex = line.ZIndex
};
foreach (Element3D el in Resample(camera, line1, maxSize))
{
yield return(el);
}
foreach (Element3D el in Resample(camera, line2, maxSize))
{
yield return(el);
}
}
else
{
yield return(element);
}
}
else
{
yield return(element);
}
}
else if (element is Triangle3DElement triangle && element is IVectorRendererTriangle3DElement vectorRendererTriangle)
{
Point p1 = camera.Project(triangle.Point1);
Point p2 = camera.Project(triangle.Point2);
Point p3 = camera.Project(triangle.Point3);
double area = 0.5 * Math.Abs((p2.X - p1.X) * (p3.Y - p1.Y) - (p2.Y - p1.Y) * (p3.X - p1.X));
if (area > maxSize)
{
Point3D proj12 = (Point3D)((triangle.Point2 - triangle.Point1) * 0.5 + triangle.Point1);
Point3D proj23 = (Point3D)((triangle.Point3 - triangle.Point2) * 0.5 + triangle.Point2);
Point3D proj31 = (Point3D)((triangle.Point1 - triangle.Point3) * 0.5 + triangle.Point3);
NormalizedVector3D proj12Normal = (triangle.Point1Normal * 0.5 + triangle.Point2Normal * 0.5).Normalize();
NormalizedVector3D proj23Normal = (triangle.Point2Normal * 0.5 + triangle.Point3Normal * 0.5).Normalize();
NormalizedVector3D proj31Normal = (triangle.Point3Normal * 0.5 + triangle.Point1Normal * 0.5).Normalize();
VectorRendererTriangle3DElement t1 = new VectorRendererTriangle3DElement(triangle.Point1, proj12, proj31, triangle.Point1Normal, proj12Normal, proj31Normal)
{
Tag = triangle.Tag, ZIndex = triangle.ZIndex, OverFill = vectorRendererTriangle.OverFill, CastsShadow = triangle.CastsShadow, ReceivesShadow = triangle.ReceivesShadow
};
t1.Fill.AddRange(triangle.Fill);
t1.Parent = vectorRendererTriangle.Parent ?? triangle;
VectorRendererTriangle3DElement t2 = new VectorRendererTriangle3DElement(triangle.Point2, proj23, proj12, triangle.Point2Normal, proj23Normal, proj12Normal)
{
Tag = triangle.Tag, ZIndex = triangle.ZIndex, OverFill = vectorRendererTriangle.OverFill, CastsShadow = triangle.CastsShadow, ReceivesShadow = triangle.ReceivesShadow
};
t2.Fill.AddRange(triangle.Fill);
t2.Parent = vectorRendererTriangle.Parent ?? triangle;
VectorRendererTriangle3DElement t3 = new VectorRendererTriangle3DElement(triangle.Point3, proj31, proj23, triangle.Point3Normal, proj31Normal, proj23Normal)
{
Tag = triangle.Tag, ZIndex = triangle.ZIndex, OverFill = vectorRendererTriangle.OverFill, CastsShadow = triangle.CastsShadow, ReceivesShadow = triangle.ReceivesShadow
};
t3.Fill.AddRange(triangle.Fill);
t3.Parent = vectorRendererTriangle.Parent ?? triangle;
VectorRendererTriangle3DElement t4 = new VectorRendererTriangle3DElement(proj12, proj23, proj31, proj12Normal, proj23Normal, proj31Normal)
{
Tag = triangle.Tag, ZIndex = triangle.ZIndex, OverFill = vectorRendererTriangle.OverFill, CastsShadow = triangle.CastsShadow, ReceivesShadow = triangle.ReceivesShadow
};
t4.Fill.AddRange(triangle.Fill);
t4.Parent = vectorRendererTriangle.Parent ?? triangle;
foreach (Element3D el in Resample(camera, t1, maxSize))
{
yield return(el);
}
foreach (Element3D el in Resample(camera, t2, maxSize))
{
yield return(el);
}
foreach (Element3D el in Resample(camera, t3, maxSize))
{
yield return(el);
}
foreach (Element3D el in Resample(camera, t4, maxSize))
{
yield return(el);
}
}
else
{
yield return(element);
}
}
}
/// <inheritdoc/>
public double GetObstruction(Point3D point, IEnumerable <Triangle3DElement> shadowingTriangles)
{
double totalObstruction = 0;
int sampleCount = 0;
{
Vector3D reverseDir = this.VirtualSource - point;
double denom = (reverseDir * this.Direction);
if (denom == 0)
{
//totalObstruction += 0;
sampleCount++;
}
else
{
double d = this.SourceDistance / denom;
Point3D pt = this.VirtualSource + d * reverseDir;
double maxD = (point - pt).Modulus;
NormalizedVector3D reverseDirNorm = new NormalizedVector3D(reverseDir.X / maxD, reverseDir.Y / maxD, reverseDir.Z / maxD, false);
bool found = false;
foreach (Triangle3DElement triangle in shadowingTriangles)
{
Point3D?projected = triangle.ProjectOnThisPlane(point, reverseDirNorm, true, maxD);
if (projected != null && Intersections3D.PointInTriangle(projected.Value, triangle.Point1, triangle.Point2, triangle.Point3))
{
totalObstruction += 1;
sampleCount++;
found = true;
break;
}
}
if (!found)
{
//totalObstruction += 0;
sampleCount++;
}
}
}
for (int i = 0; i < ShadowSamplingPoints.Length; i++)
{
Vector3D reverseDir = ShadowSamplingPoints[i] - point;
double maxD = reverseDir.Modulus;
NormalizedVector3D reverseDirNorm = new NormalizedVector3D(reverseDir.X / maxD, reverseDir.Y / maxD, reverseDir.Z / maxD, false);
bool found = false;
foreach (Triangle3DElement triangle in shadowingTriangles)
{
Point3D?projected = triangle.ProjectOnThisPlane(point, reverseDirNorm, true, maxD);
if (projected != null && Intersections3D.PointInTriangle(projected.Value, triangle.Point1, triangle.Point2, triangle.Point3))
{
totalObstruction += 1;
sampleCount++;
found = true;
break;
}
}
if (!found)
{
//totalObstruction += 0;
sampleCount++;
}
}
return(totalObstruction / sampleCount);
}
/// <summary>
/// Creates a quadrilater, specifying the vertex normals at the four vertices. All the vertices need not be coplanar.
/// </summary>
/// <param name="point1">The first vertex of the quadrilater.</param>
/// <param name="point2">The second vertex of the quadrilater.</param>
/// <param name="point3">The third vertex of the quadrilater.</param>
/// <param name="point4">The fourth vertex of the quadrilater.</param>
/// <param name="point1Normal">The vertex normal at the first vertex of the quadrilater.</param>
/// <param name="point2Normal">The vertex normal at the second vertex of the quadrilater.</param>
/// <param name="point3Normal">The vertex normal at the third vertex of the quadrilater.</param>
/// <param name="point4Normal">The vertex normal at the fourth vertex of the quadrilater.</param>
/// <param name="fill">A collection of materials that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <param name="tag">A tag that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <param name="zIndex">A z-index that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <returns>A list containing two <see cref="Triangle3DElement"/>s representing the quadrilater.</returns>
public static List <Element3D> CreateRectangle(Point3D point1, Point3D point2, Point3D point3, Point3D point4, NormalizedVector3D point1Normal, NormalizedVector3D point2Normal, NormalizedVector3D point3Normal, NormalizedVector3D point4Normal, IEnumerable <IMaterial> fill, string tag = null, int zIndex = 0)
{
Triangle3DElement triangle1 = new Triangle3DElement(point1, point2, point3, point1Normal, point2Normal, point3Normal);
triangle1.Fill.AddRange(fill);
triangle1.Tag = tag;
triangle1.ZIndex = zIndex;
Triangle3DElement triangle2 = new Triangle3DElement(point1, point3, point4, point1Normal, point3Normal, point4Normal);
triangle2.Fill.AddRange(fill);
triangle2.Tag = tag;
triangle2.ZIndex = zIndex;
return(new List <Element3D> {
triangle1, triangle2
});
}
/// <inheritdoc/>
public VectorRendererTriangle3DElement(Point3D point1, Point3D point2, Point3D point3, NormalizedVector3D point1Normal, NormalizedVector3D point2Normal, NormalizedVector3D point3Normal) : base(point1, point2, point3, point1Normal, point2Normal, point3Normal)
{
}
/// <summary>
/// Deconstructs the struct.
/// </summary>
/// <param name="intensity">This parameter will hold the <see cref="Intensity"/> of the light.</param>
/// <param name="direction">This parameter will hold the <see cref="Direction"/> of the light.</param>
public void Deconstruct(out double intensity, out NormalizedVector3D direction)
{
intensity = this.Intensity;
direction = this.Direction;
}
/// <summary>
/// Creates a new <see cref="MaskedLightSource"/> by triangulating the specified <see cref="GraphicsPath"/>.
/// </summary>
/// <param name="intensity">The base intensity of the light.</param>
/// <param name="position">The position of the light source.</param>
/// <param name="direction">The direction of the light.</param>
/// <param name="distance">The distance between the light source and the mask plane.</param>
/// <param name="mask">A <see cref="GraphicsPath"/> representing the transparent part of the mask.</param>
/// <param name="maskOrientation">An angle in radians determining the orientation of the 2D mask in the mask plane.</param>
/// <param name="triangulationResolution">The resolution to use to triangulate the <paramref name="mask"/>.</param>
public MaskedLightSource(double intensity, Point3D position, NormalizedVector3D direction, double distance, GraphicsPath mask, double maskOrientation, double triangulationResolution) : this(intensity, position, direction, distance, mask.Triangulate(triangulationResolution, true), maskOrientation)
{
}
/// <summary>
/// Creates a flat polygon.
/// </summary>
/// <param name="polygon2D">A 2D <see cref="GraphicsPath"/> representing the polygon.</param>
/// <param name="triangulationResolution">The resolution that will be used to linearise curve segments in the <see cref="GraphicsPath"/>.</param>
/// <param name="origin">A <see cref="Point3D"/> that will correspond to the origin of the 2D reference system.</param>
/// <param name="xAxis">A <see cref="NormalizedVector3D"/> that will correspond to the x axis of the 2D reference system. This will be orthonormalised to the <paramref name="yAxis"/>.</param>
/// <param name="yAxis">A <see cref="NormalizedVector3D"/> that will correspond to the y axis of the 2D reference system.</param>
/// <param name="reverseTriangles">Indicates whether the order of the points (and thus the normals) of all the triangles returned by this method should be reversed.</param>
/// <param name="fill">A collection of materials that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <param name="tag">A tag that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <param name="zIndex">A z-index that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <returns>A list of <see cref="Triangle3DElement"/>s that constitute the polygon.</returns>
public static List <Element3D> CreatePolygon(GraphicsPath polygon2D, double triangulationResolution, Point3D origin, NormalizedVector3D xAxis, NormalizedVector3D yAxis, bool reverseTriangles, IEnumerable <IMaterial> fill, string tag = null, int zIndex = 0)
{
xAxis = (xAxis - yAxis * (xAxis * yAxis)).Normalize();
List <GraphicsPath> triangles = polygon2D.Triangulate(triangulationResolution, true).ToList();
List <Element3D> tbr = new List <Element3D>(triangles.Count);
for (int i = 0; i < triangles.Count; i++)
{
Point p1 = triangles[i].Segments[0].Point;
Point p2 = triangles[i].Segments[1].Point;
Point p3 = triangles[i].Segments[2].Point;
Point3D p13D = origin + xAxis * p1.X + yAxis * p1.Y;
Point3D p23D = origin + xAxis * p2.X + yAxis * p2.Y;
Point3D p33D = origin + xAxis * p3.X + yAxis * p3.Y;
Triangle3DElement t = !reverseTriangles ? new Triangle3DElement(p13D, p23D, p33D) : new Triangle3DElement(p13D, p33D, p23D);
t.Fill.AddRange(fill);
t.Tag = tag;
t.ZIndex = zIndex;
tbr.Add(t);
}
return(tbr);
}
/// <summary>
/// Creates a new <see cref="LightIntensity"/>.
/// </summary>
/// <param name="intensity">The intensity of the light.</param>
/// <param name="direction">The direction from which the light comes.</param>
public LightIntensity(double intensity, NormalizedVector3D direction)
{
this.Intensity = intensity;
this.Direction = direction;
}
/// <summary>
/// Creates a new <see cref="ParallelLightSource"/> instance.
/// </summary>
/// <param name="intensity">The intensity of the light.</param>
/// <param name="direction">The direction along which the light travels.</param>
public ParallelLightSource(double intensity, NormalizedVector3D direction)
{
this.Intensity = intensity;
this.Direction = direction;
this.ReverseDirection = direction.Reverse();
}
/// <inheritdoc/>
public Colour GetColour(Point3D point, NormalizedVector3D surfaceNormal, Camera camera, IList <ILightSource> lights, IList <double> obstructions)
{
return(Colour);
}
/// <summary>
/// Creates a prism with the specified base.
/// </summary>
/// <param name="polygonBase2D">A 2D <see cref="GraphicsPath"/> representing the base of the prism.</param>
/// <param name="triangulationResolution">The resolution that will be used to linearise curve segments in the <see cref="GraphicsPath"/>.</param>
/// <param name="bottomOrigin">A <see cref="Point3D"/> that will correspond to the origin of the 2D reference system of the bottom base.</param>
/// <param name="topOrigin">A <see cref="Point3D"/> that will correspond to the origin of the 2D reference system of the top base.</param>
/// <param name="baseXAxis">A <see cref="NormalizedVector3D"/> that will correspond to the x axis of the 2D reference system of the bases. This will be orthonormalised to the <paramref name="baseYAxis"/>.</param>
/// <param name="baseYAxis">A <see cref="NormalizedVector3D"/> that will correspond to the y axis of the 2D reference system of the bases.</param>
/// <param name="fill">A collection of materials that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <param name="tag">A tag that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <param name="zIndex">A z-index that will be applied to the <see cref="Triangle3DElement"/>s returned by this method.</param>
/// <returns>A list of <see cref="Triangle3DElement"/>s that constitute the prism.</returns>
public static List <Element3D> CreatePrism(GraphicsPath polygonBase2D, double triangulationResolution, Point3D bottomOrigin, Point3D topOrigin, NormalizedVector3D baseXAxis, NormalizedVector3D baseYAxis, IEnumerable <IMaterial> fill, string tag = null, int zIndex = 0)
{
baseXAxis = (baseXAxis - baseYAxis * (baseXAxis * baseYAxis)).Normalize();
List <Element3D> tbr = new List <Element3D>();
bool orientation = (baseXAxis ^ baseYAxis) * (bottomOrigin - topOrigin) > 0;
double[,] matrix1 = Matrix3D.RotationToAlignAWithB(new NormalizedVector3D(0, 1, 0), baseYAxis);
double[,] matrix2 = Matrix3D.RotationToAlignAWithB(((Vector3D)(matrix1 * new Point3D(1, 0, 0))).Normalize(), baseXAxis);
List <List <NormalizedVector3D> > normals = (from el2 in polygonBase2D.GetLinearisationPointsNormals(triangulationResolution) select(from el in el2 select(el.X * baseXAxis + el.Y * baseYAxis).Normalize()).ToList()).ToList();
polygonBase2D = polygonBase2D.Linearise(triangulationResolution);
tbr.AddRange(CreatePolygon(polygonBase2D, triangulationResolution, bottomOrigin, baseXAxis, baseYAxis, orientation, fill, tag, zIndex));
tbr.AddRange(CreatePolygon(polygonBase2D, triangulationResolution, topOrigin, baseXAxis, baseYAxis, !orientation, fill, tag, zIndex));
List <List <Point3D> > bottomPoints = (from el2 in polygonBase2D.GetPoints() select(from el in el2 select(Point3D)(el.X * baseXAxis + el.Y * baseYAxis + (Vector3D)bottomOrigin)).ToList()).ToList();
List <List <Point3D> > topPoints = (from el2 in polygonBase2D.GetPoints() select(from el in el2 select(Point3D)(el.X * baseXAxis + el.Y * baseYAxis + (Vector3D)topOrigin)).ToList()).ToList();
if (orientation)
{
for (int i = 0; i < bottomPoints.Count; i++)
{
for (int j = 0; j < bottomPoints[i].Count - 1; j++)
{
tbr.AddRange(CreateRectangle(bottomPoints[i][j], bottomPoints[i][j + 1], topPoints[i][j + 1], topPoints[i][j], normals[i][j], normals[i][j + 1], normals[i][j + 1], normals[i][j], fill, tag, zIndex));
}
}
}
else
{
for (int i = 0; i < bottomPoints.Count; i++)
{
for (int j = 0; j < bottomPoints[i].Count - 1; j++)
{
tbr.AddRange(CreateRectangle(bottomPoints[i][j], topPoints[i][j], topPoints[i][j + 1], bottomPoints[i][j + 1], normals[i][j], normals[i][j], normals[i][j + 1], normals[i][j + 1], fill, tag, zIndex));
}
}
}
return(tbr);
}
