Commit: 36cfc9e9fdc12beeec3545854bb2ccbb23ef17c6
Author: Erik Englesson
Date: Tue Jul 3 10:36:58 2018 +0200
Branches: gsoc-2018-many-light-sampling
https://developer.blender.org/rB36cfc9e9fdc12beeec3545854bb2ccbb23ef17c6
Cycles: First iteration on split traversal
This makes it possible to sample and evaluate several
lights in a single tree traversal. Should sample highly
specular lights better too. Can only be used in branched
path tracing.
This commit contains the following:
* GUI for setting the splitting threshold
* Recursive split traversal
- Split method based on solid angle and BSDF peak
- At leafs the path radiance is accumulated to L
- Have created a simplified GGX eval that is not
currently being used.
* Refactor of common code
This is in development.
===================================================================
M intern/cycles/blender/addon/presets.py
M intern/cycles/blender/addon/properties.py
M intern/cycles/blender/addon/ui.py
M intern/cycles/blender/blender_sync.cpp
M intern/cycles/kernel/closure/bsdf_microfacet.h
M intern/cycles/kernel/kernel_light.h
M intern/cycles/kernel/kernel_path_surface.h
M intern/cycles/kernel/kernel_types.h
M intern/cycles/render/integrator.h
M intern/cycles/render/light.cpp
===================================================================
diff --git a/intern/cycles/blender/addon/presets.py
b/intern/cycles/blender/addon/presets.py
index ca9edd0c600..85e075a5167 100644
--- a/intern/cycles/blender/addon/presets.py
+++ b/intern/cycles/blender/addon/presets.py
@@ -69,6 +69,7 @@ class AddPresetSampling(AddPresetBase, Operator):
"cycles.volume_samples",
"cycles.use_square_samples",
"cycles.use_light_bvh",
+ "cycles.splitting_threshold",
"cycles.progressive",
"cycles.seed",
"cycles.sample_clamp_direct",
diff --git a/intern/cycles/blender/addon/properties.py
b/intern/cycles/blender/addon/properties.py
index dac9844a11c..b2df2c927e9 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -195,6 +195,13 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
default=False,
)
+ cls.splitting_threshold = FloatProperty(
+ name="Splitting",
+ description="Threshold for splitting. 0.0=one light, 1.0=all
lights",
+ min=0.0, max=1.0,
+ default=0.0,
+ )
+
cls.samples = IntProperty(
name="Samples",
description="Number of samples to render for each pixel",
diff --git a/intern/cycles/blender/addon/ui.py
b/intern/cycles/blender/addon/ui.py
index bb1b7bee1f4..f7ceddba4a5 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -214,6 +214,10 @@ class CYCLES_RENDER_PT_sampling(CyclesButtonsPanel, Panel):
row = layout.row(align=True)
row.label(text="Experimental:")
row.prop(cscene, "use_light_bvh", text="Light BVH")
+ if cscene.use_light_bvh and use_branched_path(context):
+ row = layout.row(align=True)
+ row.label(text="") # create empty column
+ row.prop(cscene, "splitting_threshold", text="Splitting")
draw_samples_info(layout, context)
diff --git a/intern/cycles/blender/blender_sync.cpp
b/intern/cycles/blender/blender_sync.cpp
index 49acba9304d..74169a30f53 100644
--- a/intern/cycles/blender/blender_sync.cpp
+++ b/intern/cycles/blender/blender_sync.cpp
@@ -282,6 +282,7 @@ void BlenderSync::sync_integrator()
Integrator::PATH);
integrator->use_light_bvh = get_boolean(cscene, "use_light_bvh");
+ integrator->splitting_threshold = get_float(cscene,
"splitting_threshold");
integrator->sample_all_lights_direct = get_boolean(cscene,
"sample_all_lights_direct");
integrator->sample_all_lights_indirect = get_boolean(cscene,
"sample_all_lights_indirect");
integrator->light_sampling_threshold = get_float(cscene,
"light_sampling_threshold");
diff --git a/intern/cycles/kernel/closure/bsdf_microfacet.h
b/intern/cycles/kernel/closure/bsdf_microfacet.h
index 2dd59354058..369beee1d2c 100644
--- a/intern/cycles/kernel/closure/bsdf_microfacet.h
+++ b/intern/cycles/kernel/closure/bsdf_microfacet.h
@@ -391,6 +391,81 @@ ccl_device void bsdf_microfacet_ggx_blur(ShaderClosure
*sc, float roughness)
bsdf->alpha_y = fmaxf(roughness, bsdf->alpha_y);
}
+/* TODO: Use this in the tree traversal splitting */
+ccl_device float3 bsdf_microfacet_ggx_eval_reflect_simple(const ShaderClosure
*sc, const float3 I, const float3 omega_in)
+{
+ const MicrofacetBsdf *bsdf = (const MicrofacetBsdf*)sc;
+ float alpha_x = bsdf->alpha_x;
+ float alpha_y = bsdf->alpha_y;
+ bool m_refractive = bsdf->type ==
CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID;
+ float3 N = bsdf->N;
+
+ if(m_refractive || alpha_x*alpha_y <= 1e-7f)
+ return make_float3(0.0f, 0.0f, 0.0f);
+
+ float cosNO = dot(N, I);
+ float cosNI = dot(N, omega_in); // pass in our conservative cosine
instead of this one?
+ // fresnel calcs some kind of cosine
with I too.
+
+ if(cosNI > 0 && cosNO > 0) {
+ /* get half vector */
+ float3 m = normalize(omega_in + I);
+ float alpha2 = alpha_x * alpha_y;
+ float D, G1o, G1i;
+
+ /* assume isotropic */
+
+ /* isotropic
+ * eq. 20: (F*G*D)/(4*in*on)
+ * eq. 33: first we calculate D(m) */
+ float cosThetaM = dot(N, m);
+ float cosThetaM2 = cosThetaM * cosThetaM;
+ float cosThetaM4 = cosThetaM2 * cosThetaM2;
+ float tanThetaM2 = (1 - cosThetaM2) / cosThetaM2;
+
+ /* use GTR2 */
+ D = alpha2 / (M_PI_F * cosThetaM4 * (alpha2 + tanThetaM2) *
(alpha2 + tanThetaM2));
+
+ /* eq. 34: now calculate G1(i,m) and G1(o,m) */
+ //G1o = 2 / (1 + safe_sqrtf(1 + alpha2 * (1 - cosNO * cosNO) /
(cosNO * cosNO)));
+ //G1i = 2 / (1 + safe_sqrtf(1 + alpha2 * (1 - cosNI * cosNI) /
(cosNI * cosNI)));
+
+ /* Let a2=alpha2 and cos=cosNO/cosNI then the above is
equivalent to:
+ * 2 / ( 1 + sqrt( 1 + a2 * (1 - cos^2) / cos^2 )
) = /common denom/ =
+ * 2 / ( 1 + sqrt( (cos^2 + a2 * (1 - cos^2)) / cos^2 )
) = /factor out 1/cos^2/ =
+ * 2 / ( 1 + sqrt( cos^2 + a2 * (1 - cos^2) ) /
cos ) = /common denom/ =
+ * 2 / ( (cos + sqrt( cos^2 + a2 * (1 - cos^2) )
) / cos = /move cos to num/ =
+ * 2cos / ( cos + sqrt( cos^2 + a2 * (1 - cos^2) )
) = /rewrite sqrt/ =
+ * 2cos / ( cos + sqrt( cos^2 * (1 - a2) + a2 )
)
+ * => removes one of the divisions
+ *
+ * - Glo should contain a cosNO in its numerator but this
cancels with
+ * cosNO in the denomenator in eq. 20.(removes another
division)
+ * - There should be a cosNI in the denomenator of eq. 20 but
I think
+ * this has been canceled out already since there is no
cosNI in
+ * path_radiance_bsdf_bounce() ?
+ * - Both Glo and Gli should contain a 2.0 in their numerators
but they
+ * cancel with 1/4 in eq. 20.
+ *
+ * => This code does three less divisions in total
+ * This could potentially be used in the real GGX evaluation
too.
+ */
+ G1o = 1.0f / (cosNO + safe_sqrtf(cosNO * cosNO * (1.0f -
alpha2) + alpha2));
+ G1i = cosNI / (cosNI + safe_sqrtf(cosNI * cosNI * (1.0f -
alpha2) + alpha2));
+
+ float G = G1o * G1i;
+
+ /* eq. 20 */
+ float3 F = reflection_color(bsdf, omega_in, m);
+
+ float3 out = F * G * D;
+
+ return out;
+ }
+
+ return make_float3(0.0f, 0.0f, 0.0f);
+}
+
ccl_device float3 bsdf_microfacet_ggx_eval_reflect(const ShaderClosure *sc,
const float3 I, const float3 omega_in, float *pdf)
{
const MicrofacetBsdf *bsdf = (const MicrofacetBsdf*)sc;
diff --git a/intern/cycles/kernel/kernel_light.h
b/intern/cycles/kernel/kernel_light.h
index 22804c58aa8..39d575adefa 100644
--- a/intern/cycles/kernel/kernel_light.h
+++ b/intern/cycles/kernel/kernel_light.h
@@ -1122,6 +1122,7 @@ ccl_device float calc_node_importance(KernelGlobals *kg,
float3 P, int node_offs
float theta_u = 0; // TODO: Figure out how to calculate this one
float d2 = len_squared(centroidToP);
+ // todo: fix clamp here so it is 0 outside theta_e + theta_o ?
return energy * cosf(clamp(theta - theta_o - theta_u, 0.0, theta_e))/d2;
}
@@ -1378,22 +1379,18 @@ ccl_device void light_distribution_sample(KernelGlobals
*kg, float3 P,
}
}
-/* picks a point on a light and computes the probability of picking this
point*/
-ccl_device_noinline bool light_sample(KernelGlobals *kg,
- float randu,
- float randv,
- float time,
- float3 P,
- int bounce,
- LightSample *ls)
+/* picks a point on a given light and computes the probability of picking this
point*/
+ccl_device void light_point_sample(KernelGlobals *kg,
+ float randu,
+ float randv,
+ float time,
+ float3 P,
+ int bounce,
+ int distribution_id,
+ LightSample *ls)
{
- /* sample index and compute light picking pdf */
- float pdf_factor = 0.0f;
- int index = -1;
- light_distribution_sample(kg, P, &randu, &index, &pdf_factor);
-
/* fetch light data and compute rest of light pdf */
- const ccl_global KernelLightDistribution *kdistribution =
&kernel_tex_fetch(__light_distribution, index);
+ const ccl_global KernelLightDistribution *kdistribution =
&kernel_tex_fetch(__light_distribution, distribution_id);
int prim = kdistribution->prim;
if(prim >= 0) {
@@ -1407,13 +1404,31 @@ ccl_device_noinline bool light_sample(KernelGlobals *kg,
int lamp = -prim-1;
if(UNLIKELY(light_select_reached_max_bounces(kg, lamp,
bounce))) {
- return false;
+ ls->pdf = 0.0f;
+ return;
}
if (!lamp_light_sample(kg, lamp, randu, randv, P, ls)){
- return false;
+ ls->pdf = 0.0f;
+ return;
}
}
+}
+
+/* picks a point on a light and computes the probability of picking this
point*/
+ccl_device_noinline bool light_sample(KernelGlobals *kg,
+ float randu,
+ float randv,
+ float time,
+ float3 P,
+ int bounce,
+ LightSample *ls)
+{
+ /* sample index and compute light picking pdf */
+ float pdf_factor = 0.0f;
+ int index = -1;
+ light_distribution_sample(kg, P, &randu, &index, &pdf_factor);
+ light_point_sample(kg, randu, randv, time, P, bounce, index, ls);
/* combine pdfs */
ls->pdf *= pdf_factor;
diff --git a/intern/cycles/kernel/kernel_path_surface.h
b/intern/cycles/kernel/kernel_path_surface.h
index f69fadb6669..54062a1c2b7 100644
--- a/intern/cycles/kernel/kernel_path_surface.h
+++ b/intern/cycles/kernel/kernel_path_surface.h
@@ -14,8 +14,238 @@
* limitations under the License.
*/
+#include "util/util_logging.h"
+
CCL_NAMESPACE_BEGIN
+ccl_device void accum_light_contribution(KernelGlobals *kg,
+ ShaderData *sd,
+ ShaderData* emission_sd,
+ LightSamp
@@ Diff output truncated at 10240 characters. @@
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