public override bool IntersectP(Ray r)
{
float phi;
Point phit = new Point();
Ray ray = (WorldToObject)[r];
float A = ray.Direction.X * ray.Direction.X + ray.Direction.Y * ray.Direction.Y;
float B = 2 * (ray.Direction.X * ray.Origin.X + ray.Direction.Y * ray.Origin.Y);
float C = ray.Origin.X * ray.Origin.X + ray.Origin.Y * ray.Origin.Y - Radius * Radius;
float t0 = 0, t1 = 0;
if (!MathHelper.Quadratic(A, B, C, ref t0, ref t1))
return false;
if (t0 > ray.MaxT || t1 < ray.MinT)
return false;
float thit = t0;
if (t0 < ray.MinT)
{
thit = t1;
if (thit > ray.MaxT) return false;
}
phit = ray[thit];
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0) phi += 2.0f * MathHelper.PI;
if (phit.Z < ZMin || phit.Z > ZMax || phi > PhiMax)
{
if (thit == t1) return false;
thit = t1;
if (t1 > ray.MaxT) return false;
phit = ray[thit];
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0) phi += 2.0f * MathHelper.PI;
if (phit.Z < ZMin || phit.Z > ZMax || phi > PhiMax)
return false;
}
return true;
}
public override bool Intersect(Ray r, Pointer<float> tHit, Pointer<float> rayEpsilon, Pointer<DifferentialGeometry> dg)
{
Ray ray = (WorldToObject)[r];
if (MathHelper.Abs(ray.Direction.Z) < 1e-7) return false;
float thit = (Height - ray.Origin.Z) / ray.Direction.Z;
if (thit < ray.MinT || thit > ray.MaxT)
return false;
Point phit = ray[thit];
float dist2 = phit.X * phit.X + phit.Y * phit.Y;
if (dist2 > Radius * Radius || dist2 < InnerRadius * InnerRadius)
return false;
float phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0) phi += 2.0f * MathHelper.PI;
if (phi > PhiMax)
return false;
float u = phi / PhiMax;
float oneMinusV = ((MathHelper.Sqrt(dist2) - InnerRadius) /
(Radius - InnerRadius));
float invOneMinusV = (oneMinusV > 0.0f) ? (1.0f / oneMinusV) : 0.0f;
float v = 1.0f - oneMinusV;
Vector dpdu = new Vector(-PhiMax * phit.Y, PhiMax * phit.X, 0);
Vector dpdv = new Vector(-phit.X * invOneMinusV, -phit.Y * invOneMinusV, 0);
dpdu *= PhiMax * MathHelper.InvTwoPI;
dpdv *= (Radius - InnerRadius) / Radius;
Normal dndu = new Normal(0, 0, 0), dndv = new Normal(0, 0, 0);
Transform o2w = ObjectToWorld;
dg[0] = new DifferentialGeometry(o2w[phit], o2w[dpdu], o2w[dpdv],
o2w[dndu], o2w[dndv], u, v, this);
tHit[0] = thit;
rayEpsilon[0] = 5e-4f * ~tHit;
return true;
}
public Ray(Point orig, Vector dir, Ray parent, float start, float end = float.MaxValue)
{
Origin = orig;
Direction = dir;
MinT = start;
MaxT = end;
Time = parent.Time;
Depth = parent.Depth + 1;
}
public Ray(Ray ray)
{
Origin = ray.Origin;
Direction = ray.Direction;
MaxT = ray.MaxT;
MinT = ray.MinT;
Time = ray.Time;
Depth = ray.Depth;
}
public override bool Intersect(Ray r, Pointer<float> tHit, Pointer<float> rayEpsilon, Pointer<DifferentialGeometry> dg)
{
float phi;
Point phit;
Ray ray = (WorldToObject)[r];
float A = ray.Direction.X * ray.Direction.X + ray.Direction.Y * ray.Direction.Y;
float B = 2 * (ray.Direction.X * ray.Origin.X + ray.Direction.Y * ray.Origin.Y);
float C = ray.Origin.X * ray.Origin.X + ray.Origin.Y * ray.Origin.Y - Radius * Radius;
float t0 = 0, t1 = 0;
if (!MathHelper.Quadratic(A, B, C, ref t0, ref t1))
return false;
if (t0 > ray.MaxT || t1 < ray.MinT)
return false;
float thit = t0;
if (t0 < ray.MinT)
{
thit = t1;
if (thit > ray.MaxT) return false;
}
phit = ray[thit];
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0) phi += 2.0f * MathHelper.PI;
if (phit.Z < ZMin || phit.Z > ZMax || phi > PhiMax)
{
if (thit == t1) return false;
thit = t1;
if (t1 > ray.MaxT) return false;
phit = ray[thit];
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0) phi += 2.0f * MathHelper.PI;
if (phit.Z < ZMin || phit.Z > ZMax || phi > PhiMax)
return false;
}
float u = phi / PhiMax;
float v = (phit.Z - ZMin) / (ZMax - ZMin);
Vector dpdu = new Vector(-PhiMax * phit.Y, PhiMax * phit.X, 0);
Vector dpdv = new Vector(0, 0, ZMax - ZMin);
Vector d2Pduu = -PhiMax * PhiMax * new Vector(phit.X, phit.Y, 0);
Vector d2Pduv = new Vector(0, 0, 0), d2Pdvv = new Vector(0, 0, 0);
float E = Vector.Dot(dpdu, dpdu);
float F = Vector.Dot(dpdu, dpdv);
float G = Vector.Dot(dpdv, dpdv);
Vector N = Vector.Normalize(Vector.Cross(dpdu, dpdv));
float e = Vector.Dot(N, d2Pduu);
float f = Vector.Dot(N, d2Pduv);
float g = Vector.Dot(N, d2Pdvv);
float invEGF2 = 1.0f / (E * G - F * F);
Normal dndu = new Normal((f * F - e * G) * invEGF2 * dpdu + (e * F - f * E) * invEGF2 * dpdv);
Normal dndv = new Normal((g * F - f * G) * invEGF2 * dpdu + (f * F - g * E) * invEGF2 * dpdv);
Transform o2w = ObjectToWorld;
dg[0] = new DifferentialGeometry(o2w[phit], o2w[dpdu], o2w[dpdv],
o2w[dndu], o2w[dndv], u, v, this);
tHit[0] = thit;
rayEpsilon[0] = 5e-4f * ~tHit;
return true;
}
public virtual float Pdf(Point p, Vector wi)
{
Pointer<DifferentialGeometry> dgLight = new Pointer<DifferentialGeometry>(new DifferentialGeometry());
Ray ray = new Ray(p, wi, 1e-3f);
ray.Depth = -1;
Pointer<float> thit = (Pointer<float>)0, rayEpsilon = (Pointer<float>)0;
if (!Intersect(ray, thit, rayEpsilon, dgLight)) return 0.0f;
float pdf = (Point.DistanceSquared(p, ray[thit])) / (Vector.AbsDot((Vector)(~dgLight).nn, -1.0f * wi) * Area);
if (float.IsInfinity(pdf)) pdf = 0.0f;
return pdf;
}
public override bool IntersectP(Ray r)
{
Ray ray = (WorldToObject)[r];
if (MathHelper.Abs(ray.Direction.Z) < 1e-7) return false;
float thit = (Height - ray.Origin.Z) / ray.Direction.Z;
if (thit < ray.MinT || thit > ray.MaxT)
return false;
Point phit = ray[thit];
float dist2 = phit.X * phit.X + phit.Y * phit.Y;
if (dist2 > Radius * Radius || dist2 < InnerRadius * InnerRadius)
return false;
float phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0) phi += 2.0f * MathHelper.PI;
if (phi > PhiMax)
return false;
return true;
}
public override Point Sample(Point p, float u1, float u2, Pointer<Normal> ns)
{
Point Pcenter = (ObjectToWorld)[(new Point(0, 0, 0))];
Vector wc = Vector.Normalize(Pcenter - p);
Vector wcX, wcY;
Extensions.CoordinateSystem(wc, out wcX, out wcY);
if (Point.DistanceSquared(p, Pcenter) - Radius * Radius < 1e-4f)
return Sample(u1, u2, ns);
float sinThetaMax2 = Radius * Radius / Point.DistanceSquared(p, Pcenter);
float cosThetaMax = MathHelper.Sqrt(MathHelper.Max(0.0f, 1.0f - sinThetaMax2));
Pointer<DifferentialGeometry> dgSphere = new Pointer<DifferentialGeometry>(new DifferentialGeometry());
Pointer<float> thit = (Pointer<float>)0, rayEpsilon = (Pointer<float>)0;
Point ps;
Ray r = new Ray(p, Extensions.UniformSampleCone(u1, u2, cosThetaMax, wcX, wcY, wc), 1e-3f);
if (!Intersect(r, thit, rayEpsilon, dgSphere))
thit[0] = Vector.Dot(Pcenter - p, Vector.Normalize(r.Direction));
ps = r[thit];
ns[0] = new Normal(Vector.Normalize(ps - Pcenter));
if (ReverseOrientation) ns[0] *= -1.0f;
return ps;
}
public Ray this[Ray ray]
{
get
{
Ray r = new Ray();
r.Origin = this[ray.Origin];
r.Direction = this[ray.Direction];
return r;
}
}
public override bool IntersectP(Ray r)
{
float phi, v;
Point phit;
Ray ray = (WorldToObject)[r];
float A = a * ray.Direction.X * ray.Direction.X +
a * ray.Direction.Y * ray.Direction.Y -
c * ray.Direction.Z * ray.Direction.Z;
float B = 2.0f * (a * ray.Direction.X * ray.Origin.X +
a * ray.Direction.Y * ray.Origin.Y -
c * ray.Direction.Z * ray.Origin.Z);
float C = a * ray.Origin.X * ray.Origin.X +
a * ray.Origin.Y * ray.Origin.Y -
c * ray.Origin.Z * ray.Origin.Z - 1;
float t0 = 0, t1 = 0;
if (!MathHelper.Quadratic(A, B, C, ref t0, ref t1))
return false;
if (t0 > ray.MaxT || t1 < ray.MinT)
return false;
float thit = t0;
if (t0 < ray.MinT)
{
thit = t1;
if (thit > ray.MaxT) return false;
}
phit = ray[thit];
v = (phit.Z - p1.Z) / (p2.Z - p1.Z);
Point pr = (1.0f - v) * p1 + v * p2;
phi = MathHelper.Atan2(pr.X * phit.Y - phit.X * pr.Y,
phit.X * pr.X + phit.Y * pr.Y);
if (phi < 0)
phi += 2 * MathHelper.PI;
if (phit.Z < zmin || phit.Z > zmax || phi > phiMax)
{
if (thit == t1) return false;
thit = t1;
if (t1 > ray.MaxT) return false;
phit = ray[thit];
v = (phit.Z - p1.Z) / (p2.Z - p1.Z);
Point pr2 = (1.0f - v) * p1 + v * p2;
phi = MathHelper.Atan2(pr2.X * phit.Y - phit.X * pr2.Y,
phit.X * pr2.X + phit.Y * pr2.Y);
if (phi < 0)
phi += 2 * MathHelper.PI;
if (phit.Z < zmin || phit.Z > zmax || phi > phiMax)
return false;
}
return true;
}
public override bool Intersect(Ray r, Pointer<float> tHit, Pointer<float> rayEpsilon, Pointer<DifferentialGeometry> dg)
{
float phi, v;
Point phit;
Ray ray = (WorldToObject)[r];
float A = a * ray.Direction.X * ray.Direction.X +
a * ray.Direction.Y * ray.Direction.Y -
c * ray.Direction.Z * ray.Direction.Z;
float B = 2.0f * (a * ray.Direction.X * ray.Origin.X +
a * ray.Direction.Y * ray.Origin.Y -
c * ray.Direction.Z * ray.Origin.Z);
float C = a * ray.Origin.X * ray.Origin.X +
a * ray.Origin.Y * ray.Origin.Y -
c * ray.Origin.Z * ray.Origin.Z - 1;
float t0 = 0, t1 = 0;
if (!MathHelper.Quadratic(A, B, C, ref t0, ref t1))
return false;
if (t0 > ray.MaxT || t1 < ray.MinT)
return false;
float thit = t0;
if (t0 < ray.MinT)
{
thit = t1;
if (thit > ray.MaxT) return false;
}
phit = ray[thit];
v = (phit.Z - p1.Z) / (p2.Z - p1.Z);
Point pr = (1.0f - v) * p1 + v * p2;
phi = MathHelper.Atan2(pr.X * phit.Y - phit.X * pr.Y,
phit.X * pr.X + phit.Y * pr.Y);
if (phi < 0)
phi += 2 * MathHelper.PI;
if (phit.Z < zmin || phit.Z > zmax || phi > phiMax)
{
if (thit == t1) return false;
thit = t1;
if (t1 > ray.MaxT) return false;
phit = ray[thit];
v = (phit.Z - p1.Z) / (p2.Z - p1.Z);
Point pr2 = (1.0f - v) * p1 + v * p2;
phi = MathHelper.Atan2(pr2.X * phit.Y - phit.X * pr2.Y,
phit.X * pr2.X + phit.Y * pr2.Y);
if (phi < 0)
phi += 2 * MathHelper.PI;
if (phit.Z < zmin || phit.Z > zmax || phi > phiMax)
return false;
}
float u = phi / phiMax;
float cosphi = MathHelper.Cos(phi), sinphi = MathHelper.Sin(phi);
Vector dpdu = new Vector(-phiMax * phit.Y, phiMax * phit.X, 0);
Vector dpdv = new Vector((p2.X - p1.X) * cosphi - (p2.Y - p1.Y) * sinphi,
(p2.X - p1.X) * sinphi + (p2.Y - p1.Y) * cosphi,
p2.Z - p1.Z);
Vector d2Pduu = -phiMax * phiMax *
new Vector(phit.X, phit.Y, 0);
Vector d2Pduv = phiMax *
new Vector(-dpdv.Y, dpdv.X, 0);
Vector d2Pdvv = new Vector(0, 0, 0);
float E = Vector.Dot(dpdu, dpdu);
float F = Vector.Dot(dpdu, dpdv);
float G = Vector.Dot(dpdv, dpdv);
Vector N = Vector.Normalize(Vector.Cross(dpdu, dpdv));
float e = Vector.Dot(N, d2Pduu);
float f = Vector.Dot(N, d2Pduv);
float g = Vector.Dot(N, d2Pdvv);
float invEGF2 = 1.0f / (E * G - F * F);
Normal dndu = new Normal((f * F - e * G) * invEGF2 * dpdu +
(e * F - f * E) * invEGF2 * dpdv);
Normal dndv = new Normal((g * F - f * G) * invEGF2 * dpdu +
(f * F - g * E) * invEGF2 * dpdv);
Transform o2w = ObjectToWorld;
dg[0] = new DifferentialGeometry(o2w[phit], o2w[dpdu], o2w[dpdv],
o2w[dndu], o2w[dndv], u, v, this);
tHit[0] = thit;
rayEpsilon[0] = 5e-4f * tHit;
return true;
}
public override bool IntersectP(Ray r)
{
float phi;
Point phit = new Point();
Ray ray = WorldToObject[r];
float A = ray.Direction.X * ray.Direction.X + ray.Direction.Y * ray.Direction.Y + ray.Direction.Z * ray.Direction.Z;
float B = 2 * (ray.Direction.X * ray.Origin.X + ray.Direction.Y * ray.Origin.Y + ray.Direction.Z * ray.Origin.Z);
float C = ray.Origin.X * ray.Origin.X + ray.Origin.Y * ray.Origin.Y +
ray.Origin.Z * ray.Origin.Z - Radius * Radius;
float t0 = 0, t1 = 0;
if (!MathHelper.Quadratic(A, B, C, ref t0, ref t1))
return false;
if (t0 > ray.MaxT || t1 < ray.MinT)
return false;
float thit = t0;
if (t0 < ray.MinT)
{
thit = t1;
if (thit > ray.MaxT) return false;
}
phit = ray[thit];
if (phit.X == 0.0f && phit.Y == 0.0f) phit.X = 1e-5f * Radius;
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0.0f) phi += 2.0f * MathHelper.PI;
if ((zmin > -Radius && phit.Z < zmin) ||
(zmax < Radius && phit.Z > zmax) || phi > phiMax)
{
if (thit == t1) return false;
if (t1 > ray.MaxT) return false;
thit = t1;
phit = ray[thit];
if (phit.X == 0.0f && phit.Y == 0.0f) phit.X = 1e-5f * Radius;
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0.0f) phi += 2.0f * MathHelper.PI;
if ((zmin > -Radius && phit.Z < zmin) ||
(zmax < Radius && phit.Z > zmax) || phi > phiMax)
return false;
}
return true;
}
public override bool Intersect(Ray r, Pointer<float> tHit, Pointer<float> rayEpsilon, Pointer<DifferentialGeometry> dg)
{
float phi;
Point phit = new Point();
Ray ray = (WorldToObject)[r];
float A = ray.Direction.X * ray.Direction.X + ray.Direction.Y * ray.Direction.Y + ray.Direction.Z * ray.Direction.Z;
float B = 2 * (ray.Direction.X * ray.Origin.X + ray.Direction.Y * ray.Origin.Y + ray.Direction.Z * ray.Origin.Z);
float C = ray.Origin.X * ray.Origin.X + ray.Origin.Y * ray.Origin.Y +
ray.Origin.Z * ray.Origin.Z - Radius * Radius;
float t0 = 0, t1 = 0;
if (!MathHelper.Quadratic(A, B, C, ref t0, ref t1))
return false;
if (t0 > ray.MaxT || t1 < ray.MinT)
return false;
float thit = t0;
if (t0 < ray.MinT)
{
thit = t1;
if (thit > ray.MaxT) return false;
}
phit = ray[thit];
if (phit.X == 0.0f && phit.Y == 0.0f) phit.X = 1e-5f * Radius;
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0.0f) phi += 2.0f * MathHelper.PI;
if ((zmin > -Radius && phit.Z < zmin) ||
(zmax < Radius && phit.Z > zmax) || phi > phiMax)
{
if (thit == t1) return false;
if (t1 > ray.MaxT) return false;
thit = t1;
phit = ray[thit];
if (phit.X == 0.0f && phit.Y == 0.0f) phit.X = 1e-5f * Radius;
phi = MathHelper.Atan2(phit.Y, phit.X);
if (phi < 0.0f) phi += 2.0f * MathHelper.PI;
if ((zmin > -Radius && phit.Z < zmin) ||
(zmax < Radius && phit.Z > zmax) || phi > phiMax)
return false;
}
float u = phi / phiMax;
float theta = MathHelper.Acos(MathHelper.Clamp(phit.Z / Radius, -1.0f, 1.0f));
float v = (theta - thetaMin) / (thetaMax - thetaMin);
float zradius = MathHelper.Sqrt(phit.X * phit.X + phit.Y * phit.Y);
float invzradius = 1.0f / zradius;
float cosphi = phit.X * invzradius;
float sinphi = phit.Y * invzradius;
Vector dpdu = new Vector(-phiMax * phit.Y, phiMax * phit.X, 0);
Vector dpdv = (thetaMax - thetaMin) *
new Vector(phit.Z * cosphi, phit.Z * sinphi,
-Radius * MathHelper.Sin(theta));
Vector d2Pduu = -phiMax * phiMax * new Vector(phit.X, phit.Y, 0);
Vector d2Pduv = (thetaMax - thetaMin) * phit.Z * phiMax *
new Vector(-sinphi, cosphi, 0.0f);
Vector d2Pdvv = -(thetaMax - thetaMin) * (thetaMax - thetaMin) *
new Vector(phit.X, phit.Y, phit.Z);
float E = Vector.Dot(dpdu, dpdu);
float F = Vector.Dot(dpdu, dpdv);
float G = Vector.Dot(dpdv, dpdv);
Vector N = Vector.Normalize(Vector.Cross(dpdu, dpdv));
float e = Vector.Dot(N, d2Pduu);
float f = Vector.Dot(N, d2Pduv);
float g = Vector.Dot(N, d2Pdvv);
float invEGF2 = 1.0f / (E * G - F * F);
Normal dndu = new Normal((f * F - e * G) * invEGF2 * dpdu + (e * F - f * E) * invEGF2 * dpdv);
Normal dndv = new Normal((g * F - f * G) * invEGF2 * dpdu + (f * F - g * E) * invEGF2 * dpdv);
Transform o2w = ObjectToWorld;
dg[0] = new DifferentialGeometry(o2w[phit], o2w[dpdu], o2w[dpdv], o2w[dndu], o2w[dndv], u, v, this);
tHit[0] = thit;
rayEpsilon[0] = 5e-4f * ~tHit;
return true;
}
public RayDifferential(Point orig, Vector dir, Ray parent, float start, float end = float.MaxValue)
: base(orig, dir, start, end, parent.Time, parent.Depth + 1)
{
HasDifferentials = false;
}
public RayDifferential(Ray ray)
: base(ray)
{
HasDifferentials = false;
}
public Ray this[Ray r]
{
get
{
Ray tr = new Ray();
if (!actuallyAnimated || r.Time <= startTime)
tr = (startTransform)[r];
else if (r.Time >= endTime)
tr = (endTransform)[r];
else
{
Transform t = new Transform();
Interpolate(r.Time, t);
tr = t[r];
}
tr.Time = r.Time;
return tr;
}
}
public override bool IntersectP(Ray ray)
{
Point p1 = mesh.p[v[0]];
Point p2 = mesh.p[v[1]];
Point p3 = mesh.p[v[2]];
Vector e1 = p2 - p1;
Vector e2 = p3 - p1;
Vector s1 = Vector.Cross(ray.Direction, e2);
float divisor = Vector.Dot(s1, e1);
if (divisor == 0.0f)
return false;
float invDivisor = 1.0f / divisor;
Vector d = ray.Origin - p1;
float b1 = Vector.Dot(d, s1) * invDivisor;
if (b1 < 0 || b1 > 1)
return false;
Vector s2 = Vector.Cross(d, e1);
float b2 = Vector.Dot(ray.Direction, s2) * invDivisor;
if (b2 < 0 || b1 + b2 > 1)
return false;
float t = Vector.Dot(e2, s2) * invDivisor;
if (t < ray.MinT || t > ray.MaxT)
return false;
if (ray.Depth != -1 && mesh.alphaTexture != null)
{
Vector dpdu, dpdv;
float[][] uvs = new float[3][];
uvs[0] = new float[2];
uvs[1] = new float[2];
uvs[2] = new float[2];
GetUVs(uvs);
float du1 = uvs[0][0] - uvs[2][0];
float du2 = uvs[1][0] - uvs[2][0];
float dv1 = uvs[0][1] - uvs[2][1];
float dv2 = uvs[1][1] - uvs[2][1];
Vector dp1 = p1 - p3, dp2 = p2 - p3;
float determinant = du1 * dv2 - dv1 * du2;
if (determinant == 0.0f)
{
Extensions.CoordinateSystem(Vector.Normalize(Vector.Cross(e2, e1)), out dpdu, out dpdv);
}
else
{
float invdet = 1.0f / determinant;
dpdu = (dv2 * dp1 - dv1 * dp2) * invdet;
dpdv = (-du2 * dp1 + du1 * dp2) * invdet;
}
float b0 = 1 - b1 - b2;
float tu = b0 * uvs[0][0] + b1 * uvs[1][0] + b2 * uvs[2][0];
float tv = b0 * uvs[0][1] + b1 * uvs[1][1] + b2 * uvs[2][1];
DifferentialGeometry dgLocal = new DifferentialGeometry(ray[t], dpdu, dpdv, new Normal(0,0,0), new Normal(0,0,0), tu, tv, this);
if (mesh.alphaTexture.Evaluate(dgLocal) == 0.0f)
return false;
}
return true;
}
public bool IntersectRay(Ray ray, ref float hitt0, ref float hitt1)
{
float t0 = ray.MinT, t1 = ray.MaxT;
for (int i = 0; i < 3; ++i)
{
float invRayDir = 1.0f / ray.Direction[i];
float tNear = (Min[i] - ray.Origin[i]) * invRayDir;
float tFar = (Max[i] - ray.Origin[i]) * invRayDir;
if (tNear > tFar) MathHelper.Swap<float>(ref tNear,ref tFar);
t0 = tNear > t0 ? tNear : t0;
t1 = tFar < t1 ? tFar : t1;
if (t0 > t1) return false;
}
hitt0 = t0;
hitt1 = t1;
return true;
}
public virtual bool Intersect(Ray r, Pointer<float> tHit, Pointer<float> rayEpsilon, Pointer<DifferentialGeometry> dg)
{
return false;
}
public virtual bool IntersectP(Ray r)
{
return false;
}