public void TransformToPlane(Plane newPlane)
{
double eps = 1e-7;
if (!PipeDataUtil.Equals(Vec.Dot(newPlane.Z, Plane.Z), 1, eps))
{
throw new InvalidOperationException("Cannot transform arc to a new plane");
}
if (Vec.Difference(newPlane.Origin, Plane.Origin).Length > eps)
{
throw new InvalidOperationException("The origins of the planes do not match");
}
double angle = Vec.AngleBetween(Plane.X, newPlane.X);
if (angle < eps)
{
return;
}
if (Vec.Dot(Vec.Cross(Plane.X, newPlane.X), Plane.Z) < 0)
{
angle *= -1;
}
Plane = new Plane(Plane.Origin, Plane.X.RotateAbout(Plane.Z, angle),
Plane.Y.RotateAbout(Plane.Z, angle));
StartAngle -= angle;
EndAngle -= angle;
}
public static Vec[] RenderEntry()
{
int w = 256;
int h = 256;
int samps = 25; // # samples
var tmp1 = new Vec(50, 52, 295.6);
var tmp2 = new Vec(0, -0.042612, -1).Norm();
Ray cam = new Ray(ref tmp1, ref tmp2); // cam pos, dir
Vec cx = new Vec(w * .5135 / h, 0, 0);
Vec cy = (cx.Cross(ref cam.d)).Norm().Mul(.5135);
Vec[] c = new Vec[w * h];
//#pragma omp parallel for schedule(dynamic, 1) // OpenMP
// Loop over image rows
for (int y = 0; y < h; y++)
{
//fprintf(stderr,"\rRendering (%d spp) %5.2f%%",samps*4,100.*y/(h-1));
RandomLCG rand = new RandomLCG((uint)y);
// Loop cols
for (ushort x = 0; x < w; x++)
{
// 2x2 subpixel rows
for (int sy = 0; sy < 2; sy++)
{
int i = (h - y - 1) * w + x;
// 2x2 subpixel cols
for (int sx = 0; sx < 2; sx++)
{
Vec r = Vec_Zero;
for (int s = 0; s < samps; s++)
{
double r1 = 2 * rand.NextNumber();
double r2 = 2 * rand.NextNumber();
double dx = r1 < 1 ? MathSqrt(r1) - 1 : 1 - MathSqrt(2 - r1);
double dy = r2 < 1 ? MathSqrt(r2) - 1 : 1 - MathSqrt(2 - r2);
var tmp3 = cy.Mul(((sy + .5 + dy) / 2 + y) / h - .5);
Vec d = cx.Mul(((sx + .5 + dx) / 2 + x) / w - .5).Add(
ref tmp3).Add(ref cam.d);
var tmp4 = d.Mul(140);
var tmp5 = cam.o.Add(ref tmp4);
var tmp6 = d.Norm();
var tmp7 = new Ray(ref tmp5, ref tmp6);
var tmp8 = radiance(ref tmp7, 0, ref rand).Mul(1.0 / samps);
r = r.Add(ref tmp8);
}
var tmp9 = new Vec(clamp(r.x), clamp(r.y), clamp(r.z)).Mul(.25);
c[i] = c[i].Add(ref tmp9);
}
}
}
}
return(c);
}
public static double ComputeUnscaledFormFactor(
this Polygon3d polygon,
V3d p, V3d n,
double eps = 1e-6)
{
var vc = polygon.PointCount;
V3d[] cpa = new V3d[vc + 1];
var cc = 0;
var pb = polygon[0] - p;
var hb = Vec.Dot(pb, n); bool hbp = hb > eps, hbn = hb < -eps;
if (hb >= -eps)
{
cpa[cc++] = pb;
}
var p0 = pb; var h0 = hb; var h0p = hbp; var h0n = hbn;
for (int vi = 1; vi < vc; vi++)
{
var p1 = polygon[vi] - p; var h1 = Vec.Dot(p1, n);
bool h1p = h1 > eps, h1n = h1 < -eps;
if (h0p && h1n || h0n && h1p)
{
cpa[cc++] = p0 + (p1 - p0) * (h0 / (h0 - h1));
}
if (h1 >= -eps)
{
cpa[cc++] = p1;
}
p0 = p1; h0 = h1; h0p = h1p; h0n = h1n;
}
if (h0p && hbn || h0n && hbp)
{
cpa[cc++] = p0 + (pb - p0) * (h0 / (h0 - hb));
}
var cpr = cpa.Map(cc, v => v.Length);
var cv = Vec.Cross(cpa[0], cpa[cc - 1]);
double ff = Vec.Dot(n, cv)
* Fun.AcosClamped(Vec.Dot(cpa[0], cpa[cc - 1])
/ (cpr[0] * cpr[cc - 1]))
/ cv.Length;
for (int ci = 0; ci < cc - 1; ci++)
{
cv = Vec.Cross(cpa[ci + 1], cpa[ci]);
ff += Vec.Dot(n, cv)
* Fun.AcosClamped(Vec.Dot(cpa[ci + 1], cpa[ci])
/ (cpr[ci + 1] * cpr[ci]))
/ cv.Length;
}
return(ff);
}
/// <summary>
/// Computes from a <see cref="V3f"/> point (origin) and
/// a <see cref="V3f"/> normal the transformation matrix
/// and its inverse.
/// </summary>
/// <param name="origin">The point which will become the new origin.</param>
/// <param name="normal">The normal vector of the new ground plane.</param>
/// <param name="local2global">A <see cref="M44f"/>The trafo from local to global system.</param>
/// <param name="global2local">A <see cref="M44f"/>The trafofrom global to local system.</param>
public static void NormalFrame(V3f origin, V3f normal,
out M44f local2global, out M44f global2local
)
{
V3f min;
float x = Fun.Abs(normal.X);
float y = Fun.Abs(normal.Y);
float z = Fun.Abs(normal.Z);
if (x < y)
{
if (x < z)
{
min = V3f.XAxis;
}
else
{
min = V3f.ZAxis;
}
}
else
{
if (y < z)
{
min = V3f.YAxis;
}
else
{
min = V3f.ZAxis;
}
}
V3f xVec = Vec.Cross(normal, min);
xVec.Normalize(); // this is now guaranteed to be normal to the input normal
V3f yVec = Vec.Cross(normal, xVec);
yVec.Normalize();
V3f zVec = normal;
zVec.Normalize();
local2global = new M44f(xVec.X, yVec.X, zVec.X, origin.X,
xVec.Y, yVec.Y, zVec.Y, origin.Y,
xVec.Z, yVec.Z, zVec.Z, origin.Z,
0, 0, 0, 1);
M44f mat = new M44f(xVec.X, xVec.Y, xVec.Z, 0,
yVec.X, yVec.Y, yVec.Z, 0,
zVec.X, zVec.Y, zVec.Z, 0,
0, 0, 0, 1);
var shift = M44f.Translation(-origin);
global2local = mat * shift;
}
/// <summary>
/// Computes from a <see cref="V3d"/> point (origin) and
/// a <see cref="V3d"/> normal the transformation matrix
/// and its inverse.
/// </summary>
/// <param name="origin">The point which will become the new origin.</param>
/// <param name="normal">The normal vector of the new ground plane.</param>
/// <param name="local2global">A <see cref="M44d"/>The trafo from local to global system.</param>
/// <param name="global2local">A <see cref="M44d"/>The trafofrom global to local system.</param>
public static void NormalFrame(V3d origin, V3d normal,
out M44d local2global, out M44d global2local
)
{
V3d min;
double x = Fun.Abs(normal.X);
double y = Fun.Abs(normal.Y);
double z = Fun.Abs(normal.Z);
if (x < y)
{
if (x < z)
{
min = V3d.XAxis;
}
else
{
min = V3d.ZAxis;
}
}
else
{
if (y < z)
{
min = V3d.YAxis;
}
else
{
min = V3d.ZAxis;
}
}
V3d xVec = Vec.Cross(normal, min);
xVec.Normalize(); // this is now guaranteed to be normal to the input normal
V3d yVec = Vec.Cross(normal, xVec);
yVec.Normalize();
V3d zVec = normal;
zVec.Normalize();
local2global = new M44d(xVec.X, yVec.X, zVec.X, origin.X,
xVec.Y, yVec.Y, zVec.Y, origin.Y,
xVec.Z, yVec.Z, zVec.Z, origin.Z,
0, 0, 0, 1);
M44d mat = new M44d(xVec.X, xVec.Y, xVec.Z, 0,
yVec.X, yVec.Y, yVec.Z, 0,
zVec.X, zVec.Y, zVec.Z, 0,
0, 0, 0, 1);
var shift = M44d.Translation(-origin);
global2local = mat * shift;
}
/// <summary>
/// Computes from a <see cref="V__x3t__"/> point (origin) and
/// a <see cref="V__x3t__"/> normal the transformation matrix
/// and its inverse.
/// </summary>
/// <param name="origin">The point which will become the new origin.</param>
/// <param name="normal">The normal vector of the new ground plane.</param>
/// <param name="local2global">A <see cref="M4__x4t__"/>The trafo from local to global system.</param>
/// <param name="global2local">A <see cref="M4__x4t__"/>The trafofrom global to local system.</param>
public static void NormalFrame(V__x3t__ origin, V__x3t__ normal,
out M4__x4t__ local2global, out M4__x4t__ global2local
)
{
V__x3t__ min;
__ft__ x = Fun.Abs(normal.X);
__ft__ y = Fun.Abs(normal.Y);
__ft__ z = Fun.Abs(normal.Z);
if (x < y)
{
if (x < z)
{
min = V__x3t__.XAxis;
}
else
{
min = V__x3t__.ZAxis;
}
}
else
{
if (y < z)
{
min = V__x3t__.YAxis;
}
else
{
min = V__x3t__.ZAxis;
}
}
V__x3t__ xVec = Vec.Cross(normal, min);
xVec.Normalize(); // this is now guaranteed to be normal to the input normal
V__x3t__ yVec = Vec.Cross(normal, xVec);
yVec.Normalize();
V__x3t__ zVec = normal;
zVec.Normalize();
local2global = new M4__x4t__(xVec.X, yVec.X, zVec.X, origin.X,
xVec.Y, yVec.Y, zVec.Y, origin.Y,
xVec.Z, yVec.Z, zVec.Z, origin.Z,
0, 0, 0, 1);
M4__x4t__ mat = new M4__x4t__(xVec.X, xVec.Y, xVec.Z, 0,
yVec.X, yVec.Y, yVec.Z, 0,
zVec.X, zVec.Y, zVec.Z, 0,
0, 0, 0, 1);
var shift = M4__x4t__.Translation(-origin);
global2local = mat * shift;
}
public void Cross()
{
var p1 = new Vec(1, 2, 3);
Assert.AreEqual(Math.Sqrt(96), p1.CrossMagnitude(new Vec(3, 2, 1)));
Assert.AreEqual(96, p1.CrossSquareMagnitude(new Vec(3, 2, 1)));
Assert.AreEqual(new Vec(-4, 8, -4), p1.Crossed(new Vec(3, 2, 1)));
p1.Cross(new Vec(3, 2, 1));
Assert.AreEqual(new Vec(-4, 8, -4), p1);
}
// https://stackoverflow.com/questions/1171849/finding-quaternion-representing-the-rotation-from-one-vector-to-another
public static Rot3f HalfWayVec(V3f from, V3f into)
{
if (from.Dot(into).ApproximateEquals(-1))
{
return(new Rot3f(0, from.AxisAlignedNormal()));
}
else
{
V3f half = Vec.Normalized(from + into);
QuaternionF q = new QuaternionF(Vec.Dot(from, half), Vec.Cross(from, half));
return(new Rot3f(q.Normalized));
}
}
// https://stackoverflow.com/questions/1171849/finding-quaternion-representing-the-rotation-from-one-vector-to-another
public static __rot3t__ HalfWayVec(__v3t__ from, __v3t__ into)
{
if (from.Dot(into).ApproximateEquals(-1))
{
return(new __rot3t__(0, from.AxisAlignedNormal()));
}
else
{
__v3t__ half = Vec.Normalized(from + into);
__quatt__ q = new __quatt__(Vec.Dot(from, half), Vec.Cross(from, half));
return(new __rot3t__(q.Normalized));
}
}
public static __rot3t__ HalfWayQuat(__v3t__ from, __v3t__ into)
{
var d = Vec.Dot(from, into);
if (d.ApproximateEquals(-1))
{
return(new __rot3t__(0, from.AxisAlignedNormal()));
}
else
{
__quatt__ q = new __quatt__(d + 1, Vec.Cross(from, into));
return(new __rot3t__(q.Normalized));
}
}
public static Rot3f HalfWayQuat(V3f from, V3f into)
{
var d = Vec.Dot(from, into);
if (d.ApproximateEquals(-1))
{
return(new Rot3f(0, from.AxisAlignedNormal()));
}
else
{
QuaternionF q = new QuaternionF(d + 1, Vec.Cross(from, into));
return(new Rot3f(q.Normalized));
}
}
public static Rot3f Original(V3f from, V3f into)
{
var angle = from.AngleBetween(into);
if (angle < 1e-6f)
{
return(Rot3f.Identity);
}
else if (Constant.PiF - angle < 1e-6f)
{
return(new Rot3f(0, from.AxisAlignedNormal()));
}
else
{
V3f axis = Vec.Cross(from, into).Normalized;
return(Rot3f.Rotation(axis, angle));
}
}
/// <summary>
/// Computes from a <see cref="V__x3t__"/> normal the transformation matrix
/// from the local coordinate system where the normal is the z-axis to
/// the global coordinate system.
/// </summary>
/// <param name="normal">The normal vector of the new ground plane.</param>
public static M3__x3t__ NormalFrameLocal2Global(V__x3t__ normal)
{
V__x3t__ min;
double x = Fun.Abs(normal.X);
double y = Fun.Abs(normal.Y);
double z = Fun.Abs(normal.Z);
if (x < y)
{
if (x < z)
{
min = V__x3t__.XAxis;
}
else
{
min = V__x3t__.ZAxis;
}
}
else
{
if (y < z)
{
min = V__x3t__.YAxis;
}
else
{
min = V__x3t__.ZAxis;
}
}
var xVec = Vec.Cross(normal, min);
xVec.Normalize(); // this is now guaranteed to be normal to the input normal
var yVec = Vec.Cross(normal, xVec);
yVec.Normalize();
var zVec = normal;
zVec.Normalize();
return(new M3__x3t__(xVec.X, yVec.X, zVec.X,
xVec.Y, yVec.Y, zVec.Y,
xVec.Z, yVec.Z, zVec.Z));
}
public static __rot3t__ Original(__v3t__ from, __v3t__ into)
{
var angle = from.AngleBetween(into);
//# var rotIntoEps = isDouble ? "1e-15" : "1e-6f";
if (angle < __rotIntoEps__)
{
return(__rot3t__.Identity);
}
else if (__pi__ - angle < __rotIntoEps__)
{
return(new __rot3t__(0, from.AxisAlignedNormal()));
}
else
{
__v3t__ axis = Vec.Cross(from, into).Normalized;
return(__rot3t__.Rotation(axis, angle));
}
}
public Arc(Vec startPt, Vec endPt, Vec ptOnArc)
{
Vec midPt1 = Vec.Multiply(Vec.Sum(endPt, ptOnArc), 0.5);
Vec midPt2 = Vec.Multiply(Vec.Sum(startPt, ptOnArc), 0.5);
Vec seg1 = Vec.Difference(ptOnArc, startPt);
Vec seg2 = Vec.Difference(endPt, ptOnArc);
Vec planeZ = Vec.Cross(seg1, seg2);
Vec rad1 = Vec.Cross(planeZ, seg1);
Vec rad2 = Vec.Cross(planeZ, seg2);
Vec center = Vec.IntersectLines(midPt1, rad1, midPt2, rad2);
Vec planeX = Vec.Difference(startPt, center);
Vec planeY = Vec.Cross(planeZ, planeX);
_plane = new Plane(center, planeX, planeY, planeZ);
_radius = Vec.Difference(center, startPt).Length;
_startAngle = 0;
_endAngle = 2 * Vec.AngleBetween(rad1, rad2);
}
public void ValueType_Vec()
{
var p1 = new Vec(1, 0, 0);
var p2 = new Vec(0, 1, 0);
Assert.IsFalse(p1.IsEqual(p2, 0.99, 0.1));
Assert.IsTrue(p1.IsEqual(p2, 1.01, 0.1));
Assert.IsTrue(p1.IsEqual(p2, 0.99, Math.PI / 2));
Assert.IsTrue(p1.IsNormal(p2, 0.1));
Assert.IsFalse(p1.IsOpposite(p2, 0.1));
Assert.IsTrue(p1.IsOpposite(p2, Math.PI / 2));
Assert.IsFalse(p1.IsParallel(p2, 0.1));
Assert.IsTrue(p1.IsParallel(p2, Math.PI / 2));
p1 = new Vec(1, 2, 3);
p2 = new Vec(4, 5, 6);
Assert.AreEqual(14, p1.SquareMagnitude());
Assert.AreEqual(Math.Sqrt(14), p1.Magnitude());
p2 = p1;
p2.Add(new Vec(1, 2, 3));
Assert.AreEqual(new Vec(2, 4, 6), p2);
Assert.AreEqual(new Vec(2, 4, 6), p1.Added(new Vec(1, 2, 3)));
p2 = new Vec(1, 2, 3);
p2.Subtract(new Vec(3, 2, 1));
Assert.AreEqual(new Vec(-2, 0, 2), p2);
Assert.AreEqual(new Vec(-2, 0, 2), p1.Subtracted(new Vec(3, 2, 1)));
p2 = new Vec(1, 2, 3);
p2.Cross(new Vec(3, 2, 1));
Assert.AreEqual(new Vec(-4, 8, -4), p2);
Assert.AreEqual(new Vec(-4, 8, -4), p1.Crossed(new Vec(3, 2, 1)));
Assert.AreEqual(Math.Sqrt(96), p1.CrossMagnitude(new Vec(3, 2, 1)));
Assert.AreEqual(96, p1.CrossSquareMagnitude(new Vec(3, 2, 1)));
p2 = new Vec(1, 2, 3);
p2.CrossCross(new Vec(1, 2, 3), new Vec(4, 5, 6));
Assert.AreEqual(new Vec(-24, -6, 12), p2);
Assert.AreEqual(new Vec(-24, -6, 12), p1.CrossCrossed(new Vec(1, 2, 3), new Vec(4, 5, 6)));
p2 = new Vec(1, 2, 3);
p2.Divide(2);
Assert.AreEqual(new Vec(0.5, 1, 1.5), p2);
Assert.AreEqual(new Vec(0.5, 1, 1.5), p1.Divided(2));
Assert.AreEqual(14, p1.Dot(new Vec(1, 2, 3)));
Assert.AreEqual(0, p1.DotCross(new Vec(4, 5, 6), new Vec(4, 5, 6)));
p2 = new Vec(1, 2, 3);
p2.Multiply(2);
Assert.AreEqual(new Vec(2, 4, 6), p2);
Assert.AreEqual(new Vec(2, 4, 6), p1.Multiplied(2));
p2 = new Vec(1, 2, 3);
p2.Scale(2);
Assert.AreEqual(new Vec(2, 4, 6), p2);
Assert.AreEqual(new Vec(2, 4, 6), p1.Scaled(2));
p2 = new Vec(1, 2, 3);
p2.Normalize();
Assert.IsTrue(p2.IsEqual(new Vec(0.26726, 0.53452, 0.80178), 0.00001, 0.00001));
Assert.IsTrue(p1.Normalized().IsEqual(new Vec(0.26726, 0.53452, 0.80178), 0.00001, 0.00001));
p2 = new Vec(1, 2, 3);
p2.Reverse();
Assert.AreEqual(new Vec(-1, -2, -3), p2);
Assert.AreEqual(new Vec(-1, -2, -3), p1.Reversed());
p2.SetLinearForm(new Vec(1, 2, 3), new Vec(4, 5, 6));
Assert.AreEqual(new Vec(5, 7, 9), p2);
p2.SetLinearForm(2, new Vec(1, 2, 3), new Vec(4, 5, 6));
Assert.AreEqual(new Vec(6, 9, 12), p2);
p2.SetLinearForm(2, new Vec(1, 2, 3), 3, new Vec(4, 5, 6));
Assert.AreEqual(new Vec(14, 19, 24), p2);
p2.SetLinearForm(2, new Vec(1, 2, 3), 3, new Vec(4, 5, 6), new Vec(7, 8, 9));
Assert.AreEqual(new Vec(21, 27, 33), p2);
p2.SetLinearForm(2, new Vec(1, 2, 3), 3, new Vec(4, 5, 6), 4, new Vec(7, 8, 9));
Assert.AreEqual(new Vec(42, 51, 60), p2);
p2.SetLinearForm(2, new Vec(1, 2, 3), 3, new Vec(4, 5, 6), 4, new Vec(7, 8, 9), new Vec(10, 11, 12));
Assert.AreEqual(new Vec(52, 62, 72), p2);
p2 = new Vec(2, 0, 0);
p2.Mirror(new Vec(0, 1, 0));
Assert.AreEqual(new Vec(-2, 0, 0), p2);
Assert.AreEqual(new Vec(2, 0, 0), p2.Mirrored(new Vec(0, 1, 0)));
var m2 = new Ax1(new Pnt(-1, 2, -3), new Dir(-1, 0, 0));
p2 = new Vec(2, 1, 3);
Assert.AreEqual(new Vec(2, -1, -3), p2.Mirrored(m2));
p2.Mirror(m2);
Assert.AreEqual(new Vec(2, -1, -3), p2);
var a2 = new Ax2(new Pnt(-1, 2, -3), new Dir(-1, 0, 0));
p2 = new Vec(2, 1, 3);
Assert.AreEqual("-2,1,3", p2.Mirrored(a2).ToString());
p2.Mirror(a2);
Assert.AreEqual("-2,1,3", p2.ToString());
p2 = new Vec(2, 1, 3);
Assert.IsTrue(new Vec(2, 3, -1).IsEqual(p2.Rotated(m2, Math.PI / 2), 0.0001, 0.0001));
p2.Rotate(m2, Math.PI / 2);
Assert.IsTrue(new Vec(2, 3, -1).IsEqual(p2, 0.0001, 0.0001));
//TestContext.WriteLine(string.Format(CultureInfo.InvariantCulture, "{0},{1},{2}", gp2.x, gp2.y, gp2.z));
Trsf t1 = new Trsf();
t1.SetRotation(Ax1.OZ, Math.PI / 2);
p2 = new Vec(4, 5, 6);
Assert.AreEqual("-5,4,6", p2.Transformed(t1).ToString());
p2.Transform(t1);
Assert.AreEqual("-5,4,6", p2.ToString());
}
/// <summary>
/// Creates a plane from 3 independent points.
/// A normalized normal vector is computed and stored.
/// </summary>
public Plane3d(V3d p0, V3d p1, V3d p2)
{
Normal = Vec.Cross(p1 - p0, p2 - p0).Normalized;
Distance = Vec.Dot(Normal, p0);
}
public static unsafe Vec radiance(ref Ray r, int depth, ref RandomLCG rand)
{
double t; // distance to intersection
Sphere *obj = intersect(ref r, out t);
if (obj == null)
{
return(Vec_Zero); // if miss, return black
}
else
{
int newDepth = depth + 1;
bool isMaxDepth = newDepth > 100;
// Russian roulette for path termination
bool isUseRR = newDepth > 5;
bool isRR = isUseRR && rand.NextNumber() < obj->maxC;
if (isMaxDepth || (isUseRR && !isRR))
{
return(obj->e);
}
else
{
Vec f = (isUseRR && isRR) ? obj->cc : obj->c;
var tmp1 = r.d.Mul(t);
Vec x = r.o.Add(ref tmp1);
Vec n = (x.Sub(ref obj->p)).Norm();
Vec nl = n.Dot(ref r.d) < 0 ? n : n.Mul(-1);
if (obj->refl == MatType.DIFF)
{ // Ideal DIFFUSE reflection
double r1 = 2 * M_PI * rand.NextNumber();
double r2 = rand.NextNumber();
double r2s = MathSqrt(r2);
Vec w = nl;
Vec wo = w.x <-0.1 || w.x> 0.1 ? Vec_YAxis : Vec_XAxis;
Vec u = (wo.Cross(ref w)).Norm();
Vec v = w.Cross(ref u);
var tmp2 = v.Mul(MathSin(r1)).Mul(r2s);
var tmp3 = w.Mul(MathSqrt(1 - r2));
Vec d = (u.Mul(MathCos(r1)).Mul(r2s).Add(ref tmp2).Add(ref tmp3)).Norm();
var tmp4 = new Ray(ref x, ref d);
var tmp5 = radiance(ref tmp4, newDepth, ref rand);
var tmp6 = f.Mul(ref tmp5);
return(obj->e.Add(ref tmp6));
}
else if (obj->refl == MatType.SPEC) // Ideal SPECULAR reflection
{
var tmp8 = n.Mul(2 * (n.Dot(ref r.d)));
var tmp9 = r.d.Sub(ref tmp8);
var tmp7 = new Ray(ref x, ref tmp9);
var tmp10 = radiance(ref tmp7, newDepth, ref rand);
var tmp11 = f.Mul(ref tmp10);
return(obj->e.Add(ref tmp11));
}
else
{ // Ideal dielectric REFRACTION
var tmp100 = n.Mul(2 * (n.Dot(ref r.d)));
var tmp101 = r.d.Sub(ref tmp100);
Ray reflRay = new Ray(ref x, ref tmp101);
bool into = n.Dot(ref nl) > 0; // Ray from outside going in?
double nc = 1;
double nt = 1.5;
double nnt = into ? nc / nt : nt / nc;
double ddn = r.d.Dot(ref nl);
double cos2t = 1 - nnt * nnt * (1 - ddn * ddn);
if (cos2t < 0) // Total internal reflection
{
var tmp12 = radiance(ref reflRay, newDepth, ref rand);
var tmp13 = f.Mul(ref tmp12);
return(obj->e.Add(ref tmp13));
}
else
{
var tmp14 = n.Mul((into ? 1 : -1) * (ddn * nnt + MathSqrt(cos2t)));
Vec tdir = (r.d.Mul(nnt).Sub(ref tmp14)).Norm();
double a = nt - nc;
double b = nt + nc;
double R0 = (a * a) / (b * b);
double c = 1 - (into ? -ddn : tdir.Dot(ref n));
double Re = R0 + (1 - R0) * c * c * c * c * c;
double Tr = 1 - Re;
double P = .25 + .5 * Re;
double RP = Re / P;
double TP = Tr / (1 - P);
Vec result;
if (newDepth > 2)
{
// Russian roulette and splitting for selecting reflection and/or refraction
if (rand.NextNumber() < P)
{
result = radiance(ref reflRay, newDepth, ref rand).Mul(RP);
}
else
{
var tmp15 = new Ray(ref x, ref tdir);
result = radiance(ref tmp15, newDepth, ref rand).Mul(TP);
}
}
else
{
var tmp16 = new Ray(ref x, ref tdir);
var tmp17 = radiance(ref tmp16, newDepth, ref rand).Mul(Tr);
result = radiance(ref reflRay, newDepth, ref rand).Mul(Re).Add(ref tmp17);
}
var tmp18 = f.Mul(ref result);
return(obj->e.Add(ref tmp18));
}
}
}
}
}
