void LightSampler::sample(
const Vector3d& s,
LightSample& sample) const
{
assert(m_emitter_cdf.valid());
const EmitterCDF::ItemWeightPair result = m_emitter_cdf.sample(s[0]);
const size_t emitter_index = result.first;
const double emitter_prob = result.second;
if (emitter_index < m_light_count)
{
sample.m_triangle = 0;
sample_light(
Vector2d(s[1], s[2]),
emitter_index,
emitter_prob,
sample);
}
else
{
sample.m_light = 0;
sample_emitting_triangle(
Vector2d(s[1], s[2]),
emitter_index - m_light_count,
emitter_prob,
sample);
}
assert(sample.m_triangle || sample.m_light);
assert(sample.m_triangle == 0 || sample.m_triangle->m_edf);
assert(sample.m_probability > 0.0);
}
void LightSampler::sample_emitting_triangles(
const ShadingRay::Time& time,
const Vector3d& s,
LightSample& light_sample) const
{
assert(m_emitting_triangles_cdf.valid());
const EmitterCDF::ItemWeightPair result = m_emitting_triangles_cdf.sample(s[0]);
const size_t emitter_index = result.first;
const double emitter_prob = result.second;
light_sample.m_light = 0;
sample_emitting_triangle(
time,
Vector2d(s[1], s[2]),
emitter_index,
emitter_prob,
light_sample);
assert(light_sample.m_triangle);
assert(light_sample.m_probability > 0.0);
}