Page MenuHome
Differential D16695 Diff 58314 intern/cycles/scene/light.cpp

Changeset View

Standalone View

View Options

intern/cycles/scene/light.cpp

Show First 20 Lines • Show All 1,032 Lines • ▼ Show 20 Lines else if (light->light_type == LIGHT_AREA) {
float3 axis_v = normalize_len(extentv, &len_v); float3 axis_v = normalize_len(extentv, &len_v);
float area = len_u * len_v; float area = len_u * len_v;
if (light->round) { if (light->round) {
area *= -M_PI_4_F; area *= -M_PI_4_F;
} }
float invarea = (area != 0.0f) ? 1.0f / area : 1.0f; float invarea = (area != 0.0f) ? 1.0f / area : 1.0f;
float3 dir = light->dir; float3 dir = light->dir;
/* Convert from spread angle 0..180 to 90..0, clamping to a minimum /* Clamping to a minimum angle to avoid excessive noise. */
* angle to avoid excessive noise. */ const float min_spread = 1.0f * M_PI_F / 180.0f;
const float min_spread_angle = 1.0f * M_PI_F / 180.0f; const float half_spread = 0.5f * max(light->spread, min_spread);
const float spread_angle = 0.5f * (M_PI_F - max(light->spread, min_spread_angle)); /* cot_half_spread is h in D10594#269626 */
const float cot_half_spread = tanf(M_PI_2_F - half_spread);
/* Normalization computed using: /* Normalization computed using:
* integrate cos(x) * (1 - tan(x) * tan(a)) * sin(x) from x = 0 to pi/2 - a. */ * integrate cos(x) * (1 - tan(x) / tan(a)) * sin(x) from x = 0 to a, a being half_spread */
const float tan_spread = tanf(spread_angle); const float normalize_spread = 1.0f / (1.0f - half_spread * cot_half_spread);
const float normalize_spread = 2.0f / (2.0f + (2.0f * spread_angle - M_PI_F) * tan_spread);
dir = safe_normalize(dir); dir = safe_normalize(dir);
if (light->use_mis && area != 0.0f) if (light->use_mis && area != 0.0f)
shader_id |= SHADER_USE_MIS; shader_id |= SHADER_USE_MIS;
klights[light_index].co = co; klights[light_index].co = co;
klights[light_index].area.axis_u = axis_u; klights[light_index].area.axis_u = axis_u;
klights[light_index].area.len_u = len_u; klights[light_index].area.len_u = len_u;
klights[light_index].area.axis_v = axis_v; klights[light_index].area.axis_v = axis_v;
klights[light_index].area.len_v = len_v; klights[light_index].area.len_v = len_v;
klights[light_index].area.invarea = invarea; klights[light_index].area.invarea = invarea;
klights[light_index].area.dir = dir; klights[light_index].area.dir = dir;
klights[light_index].area.tan_spread = tan_spread; klights[light_index].area.cot_half_spread = cot_half_spread;
klights[light_index].area.normalize_spread = normalize_spread; klights[light_index].area.normalize_spread = normalize_spread;
} }
else if (light->light_type == LIGHT_SPOT) { else if (light->light_type == LIGHT_SPOT) {
shader_id &= ~SHADER_AREA_LIGHT; shader_id &= ~SHADER_AREA_LIGHT;
float radius = light->size; float radius = light->size;
float invarea = (radius > 0.0f) ? 1.0f / (M_PI_F * radius * radius) : 1.0f; float invarea = (radius > 0.0f) ? 1.0f / (M_PI_F * radius * radius) : 1.0f;
float cos_half_spot_angle = cosf(light->spot_angle * 0.5f); float cos_half_spot_angle = cosf(light->spot_angle * 0.5f);
▲ Show 20 Lines • Show All 236 Lines • Show Last 20 Lines