Spectrum GonioPhotometricLight::Sample_L(const Scene *scene, const LightSample &ls,
float u1, float u2, float time, Ray *ray, Normal *Ns, float *pdf) const {
*ray = Ray(lightPos, UniformSampleSphere(ls.uPos[0], ls.uPos[1]), 0.f, INFINITY, time);
*Ns = (Normal)ray->d;
*pdf = UniformSpherePdf();
return Intensity * Scale(ray->d);
}
// sample ray from light
Spectrum PointLight::sample_l( const Intersection& intersect , const LightSample* ls , Vector& dirToLight , float* distance , float* pdfw , float* emissionPdf , float* cosAtLight , Visibility& visibility ) const
{
// Get light position
const Vector _dirToLight = light_pos - intersect.intersect;
// Normalize vec
const float sqrLen = _dirToLight.SquaredLength();
const float len = sqrt(sqrLen);
dirToLight = _dirToLight / len;
// setup visibility ray
const float delta = 0.01f;
visibility.ray = Ray( light_pos , -dirToLight , 0 , 0.0f , len - delta );
// direction pdf from 'intersect' to light source w.r.t solid angle
if( pdfw )
*pdfw = sqrLen;
if( cosAtLight )
*cosAtLight = 1.0f;
if( distance )
*distance = len;
// product of pdf of sampling a point w.r.t surface area and a direction w.r.t direction
if( emissionPdf )
*emissionPdf = UniformSpherePdf();
return intensity;
}
Spectrum GonioPhotometricLight::Sample_L(const Scene *scene, float u1, float u2,
float u3, float u4, Ray *ray, float *pdf) const {
ray->o = lightPos;
ray->d = UniformSampleSphere(u1, u2);
*pdf = UniformSpherePdf();
return Intensity * Scale(ray->d);
}
Spectrum GonioPhotometricLight::Sample_L(const Scene *scene, const LightSample &ls,
float u1, float u2, Ray *ray, Normal *Ns, float *pdf) const {
ray->o = lightPos;
ray->d = UniformSampleSphere(ls.uPos[0], ls.uPos[1]);
*Ns = (Normal)ray->d;
*pdf = UniformSpherePdf();
return Intensity * Scale(ray->d);
}
Spectrum GonioPhotometricLight::Sample_L(const Point2f &sample1,
const Point2f &sample2, Float time,
Ray *ray, Normal3f *Ns, Float *pdfPos,
Float *pdfDir) const {
*ray = Ray(pLight, UniformSampleSphere(sample1), Infinity, time, 0, medium);
*Ns = (Normal3f)ray->d;
*pdfPos = 1.f;
*pdfDir = UniformSpherePdf();
return intensity * Scale(ray->d);
}
Spectrum PointLight::Sample_Le(const Point2f &u1, const Point2f &u2, Float time,
Ray *ray, Normal3f *nLight, Float *pdfPos,
Float *pdfDir) const {
*ray = Ray(pLight, UniformSampleSphere(u1), Infinity, time,
mediumInterface.inside);
*nLight = (Normal3f)ray->d;
*pdfPos = 1;
*pdfDir = UniformSpherePdf();
return I;
}
Spectrum GonioPhotometricLight::Sample_Le(const Point2f &u1, const Point2f &u2,
Float time, Ray *ray,
Normal3f *nLight, Float *pdfPos,
Float *pdfDir) const {
*ray = Ray(pLight, UniformSampleSphere(u1), Infinity, time, 0,
mediumInterface.inside);
*nLight = (Normal3f)ray->d;
*pdfPos = 1.f;
*pdfDir = UniformSpherePdf();
return intensity * Scale(ray->d);
}
// sample a ray from light
Spectrum PointLight::sample_l( const LightSample& ls , Ray& r , float* pdfW , float* pdfA , float* cosAtLight ) const
{
// sample a new ray
r.m_fMin = 0.0f;
r.m_fMax = FLT_MAX;
r.m_Ori = light_pos;
r.m_Dir = UniformSampleSphere( ls.u , ls.v );
// product of pdf of sampling a point w.r.t surface area and a direction w.r.t direction
if( pdfW )
*pdfW = UniformSpherePdf();
// pdf w.r.t surface area
if( pdfA )
*pdfA = 1.0f;
if( cosAtLight )
*cosAtLight = 1.0f;
return intensity;
}
void GonioPhotometricLight::Pdf(const Ray &, const Normal3f &, Float *pdfPos,
Float *pdfDir) const {
*pdfPos = 0.f;
*pdfDir = UniformSpherePdf();
}
void PointLight::Pdf_Le(const Ray &, const Normal3f &, Float *pdfPos,
Float *pdfDir) const {
*pdfPos = 0;
*pdfDir = UniformSpherePdf();
}
void GonioPhotometricLight::Pdf_Le(const Ray &, const Normal3f &, Float *pdfPos,
Float *pdfDir) const {
ProfilePhase _(Prof::LightPdf);
*pdfPos = 0.f;
*pdfDir = UniformSpherePdf();
}
void PointLight::Pdf_Le(const Ray &, const Normal3f &, Float *pdfPos,
Float *pdfDir) const {
ProfilePhase _(Prof::LightPdf);
*pdfPos = 0;
*pdfDir = UniformSpherePdf();
}