void LightSampler::collect_emitting_triangles(
const AssemblyInstanceContainer& assembly_instances,
const TransformSequence& parent_transform_seq)
{
for (const_each<AssemblyInstanceContainer> i = assembly_instances; i; ++i)
{
// Retrieve the assembly instance.
const AssemblyInstance& assembly_instance = *i;
// Retrieve the assembly.
const Assembly& assembly = assembly_instance.get_assembly();
// Compute the cumulated transform sequence of this assembly instance.
TransformSequence cumulated_transform_seq =
assembly_instance.transform_sequence() * parent_transform_seq;
cumulated_transform_seq.prepare();
// Recurse into child assembly instances.
collect_emitting_triangles(
assembly.assembly_instances(),
cumulated_transform_seq);
// Collect emitting triangles from this assembly instance.
collect_emitting_triangles(
assembly,
assembly_instance,
cumulated_transform_seq);
}
}
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());
}
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());
}
void LightSampler::collect_emitting_triangles(const Scene& scene)
{
for (const_each<AssemblyInstanceContainer> i = scene.assembly_instances(); i; ++i)
{
const AssemblyInstance& assembly_instance = *i;
if (has_emitting_materials(assembly_instance.get_assembly()))
collect_emitting_triangles(scene, assembly_instance);
}
}
LightSampler::LightSampler(const Scene& scene, const ParamArray& params)
: m_params(params)
, m_emitting_triangle_hash_table(m_triangle_key_hasher)
{
RENDERER_LOG_INFO("collecting light emitters...");
// Collect all non-physical lights.
collect_non_physical_lights(scene.assembly_instances(), TransformSequence());
m_non_physical_light_count = m_non_physical_lights.size();
// Collect all light-emitting triangles.
collect_emitting_triangles(
scene.assembly_instances(),
TransformSequence());
// Build the hash table of emitting triangles.
build_emitting_triangle_hash_table();
// Prepare the CDFs for sampling.
if (m_non_physical_lights_cdf.valid())
m_non_physical_lights_cdf.prepare();
if (m_emitting_triangles_cdf.valid())
m_emitting_triangles_cdf.prepare();
// Store the triangle probability densities into the emitting triangles.
const size_t emitting_triangle_count = m_emitting_triangles.size();
for (size_t i = 0; i < emitting_triangle_count; ++i)
m_emitting_triangles[i].m_triangle_prob = m_emitting_triangles_cdf[i].second;
RENDERER_LOG_INFO(
"found %s %s, %s emitting %s.",
pretty_int(m_non_physical_light_count).c_str(),
plural(m_non_physical_light_count, "non-physical light").c_str(),
pretty_int(m_emitting_triangles.size()).c_str(),
plural(m_emitting_triangles.size(), "triangle").c_str());
}
