Spectrum CreateRadianceProbes::Li(const Scene *scene, const RayDifferential &ray,
const Sample *sample, RNG &rng, MemoryArena &arena, Intersection *isect,
Spectrum *T) const {
Assert(ray.time == sample->time);
Spectrum localT;
if (!T) T = &localT;
Intersection localIsect;
if (!isect) isect = &localIsect;
Assert(!ray.HasNaNs());
Spectrum Lo = 0.f;
if (scene->Intersect(ray, isect))
Lo = surfaceIntegrator->Li(scene, this, ray, *isect, sample, rng, arena);
else {
for (uint32_t i = 0; i < scene->lights.size(); ++i)
Lo += scene->lights[i]->Le(ray);
}
Spectrum Lv = volumeIntegrator->Li(scene, this, ray, sample, rng, T, arena);
return *T * Lo + Lv;
}
Spectrum SamplerRenderer::Li(const Scene *scene,
const RayDifferential &ray, const Sample *sample, RNG &rng,
MemoryArena &arena, Intersection *isect, Spectrum *T) const {
Assert(ray.time == sample->time);
Assert(!ray.HasNaNs());
// Allocate local variables for _isect_ and _T_ if needed
Spectrum localT;
if (!T) T = &localT;
Intersection localIsect;
if (!isect) isect = &localIsect;
Spectrum Lo = 0.f;
if (scene->Intersect(ray, isect))
Lo = surfaceIntegrator->Li(scene, this, ray, *isect, sample,
rng, arena);
else {
// Handle ray that doesn't intersect any geometry
for (uint32_t i = 0; i < scene->lights.size(); ++i)
Lo += scene->lights[i]->Le(ray);
}
Spectrum Lv = volumeIntegrator->Li(scene, this, ray, sample, rng,
T, arena);
return *T * Lo + Lv;
}