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path: root/intern/cycles/kernel/light/area.h
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-rw-r--r--intern/cycles/kernel/light/area.h81
1 files changed, 44 insertions, 37 deletions
diff --git a/intern/cycles/kernel/light/area.h b/intern/cycles/kernel/light/area.h
index 2e863cf81c2..7d6f2a5bef9 100644
--- a/intern/cycles/kernel/light/area.h
+++ b/intern/cycles/kernel/light/area.h
@@ -15,18 +15,18 @@ CCL_NAMESPACE_BEGIN
* NOTE: light_p is modified when sample_coord is true. */
ccl_device_inline float area_light_rect_sample(float3 P,
ccl_private float3 *light_p,
- float3 axisu,
- float3 axisv,
+ float3 extentu,
+ float3 extentv,
float randu,
float randv,
bool sample_coord)
{
/* In our name system we're using P for the center, which is o in the paper. */
- float3 corner = *light_p - axisu * 0.5f - axisv * 0.5f;
- float axisu_len, axisv_len;
+ float3 corner = *light_p - extentu * 0.5f - extentv * 0.5f;
+ float extentu_len, extentv_len;
/* Compute local reference system R. */
- float3 x = normalize_len(axisu, &axisu_len);
- float3 y = normalize_len(axisv, &axisv_len);
+ float3 x = normalize_len(extentu, &extentu_len);
+ float3 y = normalize_len(extentv, &extentv_len);
float3 z = cross(x, y);
/* Compute rectangle coords in local reference system. */
float3 dir = corner - P;
@@ -38,8 +38,8 @@ ccl_device_inline float area_light_rect_sample(float3 P,
}
float x0 = dot(dir, x);
float y0 = dot(dir, y);
- float x1 = x0 + axisu_len;
- float y1 = y0 + axisv_len;
+ float x1 = x0 + extentu_len;
+ float y1 = y0 + extentv_len;
/* Compute internal angles (gamma_i). */
float4 diff = make_float4(x0, y1, x1, y0) - make_float4(x1, y0, x0, y1);
float4 nz = make_float4(y0, x1, y1, x0) * diff;
@@ -106,8 +106,8 @@ ccl_device float area_light_spread_attenuation(const float3 D,
ccl_device bool area_light_spread_clamp_area_light(const float3 P,
const float3 lightNg,
ccl_private float3 *lightP,
- ccl_private float3 *axisu,
- ccl_private float3 *axisv,
+ ccl_private float3 *extentu,
+ ccl_private float3 *extentv,
const float tan_spread)
{
/* Closest point in area light plane and distance to that plane. */
@@ -120,8 +120,8 @@ ccl_device bool area_light_spread_clamp_area_light(const float3 P,
/* TODO: would be faster to store as normalized vector + length, also in area_light_rect_sample.
*/
float len_u, len_v;
- const float3 u = normalize_len(*axisu, &len_u);
- const float3 v = normalize_len(*axisv, &len_v);
+ const float3 u = normalize_len(*extentu, &len_u);
+ const float3 v = normalize_len(*extentv, &len_v);
/* Local uv coordinates of closest point. */
const float closest_u = dot(u, closest_P - *lightP);
@@ -147,8 +147,8 @@ ccl_device bool area_light_spread_clamp_area_light(const float3 P,
const float new_len_v = max_v - min_v;
*lightP = *lightP + new_center_u * u + new_center_v * v;
- *axisu = u * new_len_u;
- *axisv = v * new_len_v;
+ *extentu = u * new_len_u;
+ *extentv = v * new_len_v;
return true;
}
@@ -164,8 +164,10 @@ ccl_device_inline bool area_light_sample(const ccl_global KernelLight *klight,
{
ls->P = make_float3(klight->co[0], klight->co[1], klight->co[2]);
- float3 axisu = make_float3(klight->area.axisu[0], klight->area.axisu[1], klight->area.axisu[2]);
- float3 axisv = make_float3(klight->area.axisv[0], klight->area.axisv[1], klight->area.axisv[2]);
+ float3 extentu = make_float3(
+ klight->area.extentu[0], klight->area.extentu[1], klight->area.extentu[2]);
+ float3 extentv = make_float3(
+ klight->area.extentv[0], klight->area.extentv[1], klight->area.extentv[2]);
float3 Ng = make_float3(klight->area.dir[0], klight->area.dir[1], klight->area.dir[2]);
float invarea = fabsf(klight->area.invarea);
bool is_round = (klight->area.invarea < 0.0f);
@@ -179,29 +181,30 @@ ccl_device_inline bool area_light_sample(const ccl_global KernelLight *klight,
float3 inplane;
if (is_round || in_volume_segment) {
- inplane = ellipse_sample(axisu * 0.5f, axisv * 0.5f, randu, randv);
+ inplane = ellipse_sample(extentu * 0.5f, extentv * 0.5f, randu, randv);
ls->P += inplane;
ls->pdf = invarea;
}
else {
inplane = ls->P;
- float3 sample_axisu = axisu;
- float3 sample_axisv = axisv;
+ float3 sample_extentu = extentu;
+ float3 sample_extentv = extentv;
if (!in_volume_segment && klight->area.tan_spread > 0.0f) {
if (!area_light_spread_clamp_area_light(
- P, Ng, &ls->P, &sample_axisu, &sample_axisv, klight->area.tan_spread)) {
+ P, Ng, &ls->P, &sample_extentu, &sample_extentv, klight->area.tan_spread)) {
return false;
}
}
- ls->pdf = area_light_rect_sample(P, &ls->P, sample_axisu, sample_axisv, randu, randv, true);
+ ls->pdf = area_light_rect_sample(
+ P, &ls->P, sample_extentu, sample_extentv, randu, randv, true);
inplane = ls->P - inplane;
}
- const float light_u = dot(inplane, axisu) * (1.0f / dot(axisu, axisu));
- const float light_v = dot(inplane, axisv) * (1.0f / dot(axisv, axisv));
+ const float light_u = dot(inplane, extentu) * (1.0f / dot(extentu, extentu));
+ const float light_v = dot(inplane, extentv) * (1.0f / dot(extentv, extentv));
/* NOTE: Return barycentric coordinates in the same notation as Embree and OptiX. */
ls->u = light_v + 0.5f;
@@ -253,10 +256,10 @@ ccl_device_inline bool area_light_intersect(const ccl_global KernelLight *klight
return false;
}
- const float3 axisu = make_float3(
- klight->area.axisu[0], klight->area.axisu[1], klight->area.axisu[2]);
- const float3 axisv = make_float3(
- klight->area.axisv[0], klight->area.axisv[1], klight->area.axisv[2]);
+ const float3 extentu = make_float3(
+ klight->area.extentu[0], klight->area.extentu[1], klight->area.extentu[2]);
+ const float3 extentv = make_float3(
+ klight->area.extentv[0], klight->area.extentv[1], klight->area.extentv[2]);
const float3 Ng = make_float3(klight->area.dir[0], klight->area.dir[1], klight->area.dir[2]);
/* One sided. */
@@ -268,7 +271,7 @@ ccl_device_inline bool area_light_intersect(const ccl_global KernelLight *klight
float3 P;
return ray_quad_intersect(
- ray->P, ray->D, ray->tmin, ray->tmax, light_P, axisu, axisv, Ng, &P, t, u, v, is_round);
+ ray->P, ray->D, ray->tmin, ray->tmax, light_P, extentu, extentv, Ng, &P, t, u, v, is_round);
}
ccl_device_inline bool area_light_sample_from_intersection(
@@ -282,8 +285,10 @@ ccl_device_inline bool area_light_sample_from_intersection(
/* area light */
float invarea = fabsf(klight->area.invarea);
- float3 axisu = make_float3(klight->area.axisu[0], klight->area.axisu[1], klight->area.axisu[2]);
- float3 axisv = make_float3(klight->area.axisv[0], klight->area.axisv[1], klight->area.axisv[2]);
+ float3 extentu = make_float3(
+ klight->area.extentu[0], klight->area.extentu[1], klight->area.extentu[2]);
+ float3 extentv = make_float3(
+ klight->area.extentv[0], klight->area.extentv[1], klight->area.extentv[2]);
float3 Ng = make_float3(klight->area.dir[0], klight->area.dir[1], klight->area.dir[2]);
float3 light_P = make_float3(klight->co[0], klight->co[1], klight->co[2]);
@@ -297,17 +302,17 @@ ccl_device_inline bool area_light_sample_from_intersection(
ls->pdf = invarea * lamp_light_pdf(Ng, -ray_D, ls->t);
}
else {
- float3 sample_axisu = axisu;
- float3 sample_axisv = axisv;
+ float3 sample_extentu = extentu;
+ float3 sample_extentv = extentv;
if (klight->area.tan_spread > 0.0f) {
if (!area_light_spread_clamp_area_light(
- ray_P, Ng, &light_P, &sample_axisu, &sample_axisv, klight->area.tan_spread)) {
+ ray_P, Ng, &light_P, &sample_extentu, &sample_extentv, klight->area.tan_spread)) {
return false;
}
}
- ls->pdf = area_light_rect_sample(ray_P, &light_P, sample_axisu, sample_axisv, 0, 0, false);
+ ls->pdf = area_light_rect_sample(ray_P, &light_P, sample_extentu, sample_extentv, 0, 0, false);
}
ls->eval_fac = 0.25f * invarea;
@@ -329,8 +334,10 @@ ccl_device_inline float area_light_tree_weight(const ccl_global KernelLight *kli
{
float3 light_P = make_float3(klight->co[0], klight->co[1], klight->co[2]);
- float3 axisu = make_float3(klight->area.axisu[0], klight->area.axisu[1], klight->area.axisu[2]);
- float3 axisv = make_float3(klight->area.axisv[0], klight->area.axisv[1], klight->area.axisv[2]);
+ float3 extentu = make_float3(
+ klight->area.extentu[0], klight->area.extentu[1], klight->area.extentu[2]);
+ float3 extentv = make_float3(
+ klight->area.extentv[0], klight->area.extentv[1], klight->area.extentv[2]);
float3 Ng = make_float3(klight->area.dir[0], klight->area.dir[1], klight->area.dir[2]);
bool is_round = (klight->area.invarea < 0.0f);
@@ -341,7 +348,7 @@ ccl_device_inline float area_light_tree_weight(const ccl_global KernelLight *kli
if (!is_round) {
if (klight->area.tan_spread > 0.0f) {
if (!area_light_spread_clamp_area_light(
- P, Ng, &light_P, &axisu, &axisv, klight->area.tan_spread)) {
+ P, Ng, &light_P, &extentu, &extentv, klight->area.tan_spread)) {
return 0.0f;
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-17 11:15:06 +0300