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_single_light(
const size_t light_index,
const Vector2d& s,
LightSample& sample) const
{
sample.m_triangle = 0;
sample_light(s, light_index, 1.0, sample);
assert(sample.m_light);
assert(sample.m_probability == 1.0);
}
void main1(void *arg)
{
color Kd = color(diffuse(), diffuse(), diffuse());
normal Nf = faceforward(normalize(N()), I());
vector V = -normalize(I());
while (illuminance(P(), Nf, PI / 2.0f))
{
color C = 0.0f;
color last = 0.0f;
int num_samples = 0;
while (sample_light())
{
C += Cl() * (
color_() * Kd * (normalize(L()) % Nf)
+ cosinePower() * specularColor() * specularbrdf(normalize(L()), Nf, V, 0.1f/*roughness()*/)
);
++ num_samples;
if ((num_samples % 4) == 0)
{
color current = C * (1.0f / (scalar)num_samples);
if (converged(current, last)){
break;
}
last = current;
}
}
C *= (1.0f / (scalar)num_samples);
Ci() += C;
}
if ( ! less_than( &transparency(), LIQ_SCALAR_ALMOST_ZERO ) )
{//transparent
Ci() = Ci() * ( 1.0f - transparency() ) + trace_transparent() * transparency();
}//else{ opacity }
setOutputForMaya();
}
