LightSampler::LightSampler(const Scene& scene)
: m_total_emissive_area(0.0)
{
RENDERER_LOG_INFO("collecting light emitters...");
// Collect all lights and light-emitting triangles.
collect_lights(scene);
collect_emitting_triangles(scene);
// Precompute some values.
m_light_count = m_lights.size();
m_rcp_total_emissive_area = 1.0 / m_total_emissive_area;
// Prepare the CDFs for sampling.
if (m_emitter_cdf.valid())
m_emitter_cdf.prepare();
if (m_emitting_triangle_cdf.valid())
m_emitting_triangle_cdf.prepare();
RENDERER_LOG_INFO(
"found %s %s, %s emitting %s.",
pretty_int(m_light_count).c_str(),
plural(m_light_count, "light").c_str(),
pretty_int(m_emitting_triangles.size()).c_str(),
plural(m_emitting_triangles.size(), "triangle").c_str());
}
LightSampler::LightSampler(const Scene& scene)
: m_total_emissive_area(0.0)
{
RENDERER_LOG_INFO("collecting light emitters...");
// Collect all lights and light-emitting triangles.
for (const_each<AssemblyInstanceContainer> i = scene.assembly_instances(); i; ++i)
{
const AssemblyInstance& assembly_instance = *i;
const Assembly& assembly = assembly_instance.get_assembly();
collect_lights(assembly, assembly_instance);
if (has_emitting_materials(assembly))
collect_emitting_triangles(assembly, assembly_instance);
}
// Precompute some values.
m_light_count = m_lights.size();
m_rcp_total_emissive_area = 1.0 / m_total_emissive_area;
// Prepare the CDFs for sampling.
if (m_emitter_cdf.valid())
m_emitter_cdf.prepare();
if (m_emitting_triangle_cdf.valid())
m_emitting_triangle_cdf.prepare();
RENDERER_LOG_INFO(
"found %s %s, %s emitting %s.",
pretty_int(m_light_count).c_str(),
plural(m_light_count, "light").c_str(),
pretty_int(m_emitting_triangles.size()).c_str(),
plural(m_emitting_triangles.size(), "triangle").c_str());
}
void LightSampler::collect_lights(const Scene& scene)
{
for (const_each<AssemblyInstanceContainer> i = scene.assembly_instances(); i; ++i)
collect_lights(*i);
}
