43b374e8c5
This commit contains the first part of the new Cycles denoising option, which filters the resulting image using information gathered during rendering to get rid of noise while preserving visual features as well as possible. To use the option, enable it in the render layer options. The default settings fit a wide range of scenes, but the user can tweak individual settings to control the tradeoff between a noise-free image, image details, and calculation time. Note that the denoiser may still change in the future and that some features are not implemented yet. The most important missing feature is animation denoising, which uses information from multiple frames at once to produce a flicker-free and smoother result. These features will be added in the future. Finally, thanks to all the people who supported this project: - Google (through the GSoC) and Theory Studios for sponsoring the development - The authors of the papers I used for implementing the denoiser (more details on them will be included in the technical docs) - The other Cycles devs for feedback on the code, especially Sergey for mentoring the GSoC project and Brecht for the code review! - And of course the users who helped with testing, reported bugs and things that could and/or should work better!
287 lines
8.9 KiB
C
287 lines
8.9 KiB
C
/*
|
|
* Copyright 2011-2013 Blender Foundation
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
#ifdef __VOLUME_SCATTER__
|
|
|
|
ccl_device_inline void kernel_path_volume_connect_light(
|
|
KernelGlobals *kg,
|
|
RNG *rng,
|
|
ShaderData *sd,
|
|
ShaderData *emission_sd,
|
|
float3 throughput,
|
|
ccl_addr_space PathState *state,
|
|
PathRadiance *L)
|
|
{
|
|
#ifdef __EMISSION__
|
|
if(!kernel_data.integrator.use_direct_light)
|
|
return;
|
|
|
|
/* sample illumination from lights to find path contribution */
|
|
float light_t = path_state_rng_1D(kg, rng, state, PRNG_LIGHT);
|
|
float light_u, light_v;
|
|
path_state_rng_2D(kg, rng, state, PRNG_LIGHT_U, &light_u, &light_v);
|
|
|
|
Ray light_ray;
|
|
BsdfEval L_light;
|
|
LightSample ls;
|
|
bool is_lamp;
|
|
|
|
/* connect to light from given point where shader has been evaluated */
|
|
# ifdef __OBJECT_MOTION__
|
|
light_ray.time = sd->time;
|
|
# endif
|
|
|
|
if(light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls))
|
|
{
|
|
float terminate = path_state_rng_light_termination(kg, rng, state);
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, state, throughput, &L_light, shadow, 1.0f, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
#endif /* __EMISSION__ */
|
|
}
|
|
|
|
#ifdef __KERNEL_GPU__
|
|
ccl_device_noinline
|
|
#else
|
|
ccl_device
|
|
#endif
|
|
bool kernel_path_volume_bounce(
|
|
KernelGlobals *kg,
|
|
RNG *rng,
|
|
ShaderData *sd,
|
|
ccl_addr_space float3 *throughput,
|
|
ccl_addr_space PathState *state,
|
|
PathRadiance *L,
|
|
ccl_addr_space Ray *ray)
|
|
{
|
|
/* sample phase function */
|
|
float phase_pdf;
|
|
BsdfEval phase_eval;
|
|
float3 phase_omega_in;
|
|
differential3 phase_domega_in;
|
|
float phase_u, phase_v;
|
|
path_state_rng_2D(kg, rng, state, PRNG_PHASE_U, &phase_u, &phase_v);
|
|
int label;
|
|
|
|
label = shader_volume_phase_sample(kg, sd, phase_u, phase_v, &phase_eval,
|
|
&phase_omega_in, &phase_domega_in, &phase_pdf);
|
|
|
|
if(phase_pdf == 0.0f || bsdf_eval_is_zero(&phase_eval))
|
|
return false;
|
|
|
|
/* modify throughput */
|
|
path_radiance_bsdf_bounce(L, throughput, &phase_eval, phase_pdf, state->bounce, label);
|
|
|
|
/* set labels */
|
|
state->ray_pdf = phase_pdf;
|
|
#ifdef __LAMP_MIS__
|
|
state->ray_t = 0.0f;
|
|
#endif
|
|
state->min_ray_pdf = fminf(phase_pdf, state->min_ray_pdf);
|
|
|
|
/* update path state */
|
|
path_state_next(kg, state, label);
|
|
|
|
/* setup ray */
|
|
ray->P = sd->P;
|
|
ray->D = phase_omega_in;
|
|
ray->t = FLT_MAX;
|
|
|
|
#ifdef __RAY_DIFFERENTIALS__
|
|
ray->dP = sd->dP;
|
|
ray->dD = phase_domega_in;
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
#ifndef __SPLIT_KERNEL__
|
|
ccl_device void kernel_branched_path_volume_connect_light(
|
|
KernelGlobals *kg,
|
|
RNG *rng,
|
|
ShaderData *sd,
|
|
ShaderData *emission_sd,
|
|
float3 throughput,
|
|
ccl_addr_space PathState *state,
|
|
PathRadiance *L,
|
|
bool sample_all_lights,
|
|
Ray *ray,
|
|
const VolumeSegment *segment)
|
|
{
|
|
#ifdef __EMISSION__
|
|
if(!kernel_data.integrator.use_direct_light)
|
|
return;
|
|
|
|
Ray light_ray;
|
|
BsdfEval L_light;
|
|
bool is_lamp;
|
|
|
|
# ifdef __OBJECT_MOTION__
|
|
light_ray.time = sd->time;
|
|
# endif
|
|
|
|
if(sample_all_lights) {
|
|
/* lamp sampling */
|
|
for(int i = 0; i < kernel_data.integrator.num_all_lights; i++) {
|
|
if(UNLIKELY(light_select_reached_max_bounces(kg, i, state->bounce)))
|
|
continue;
|
|
|
|
int num_samples = light_select_num_samples(kg, i);
|
|
float num_samples_inv = 1.0f/(num_samples*kernel_data.integrator.num_all_lights);
|
|
RNG lamp_rng = cmj_hash(*rng, i);
|
|
|
|
for(int j = 0; j < num_samples; j++) {
|
|
/* sample random position on given light */
|
|
float light_u, light_v;
|
|
path_branched_rng_2D(kg, &lamp_rng, state, j, num_samples, PRNG_LIGHT_U, &light_u, &light_v);
|
|
|
|
LightSample ls;
|
|
lamp_light_sample(kg, i, light_u, light_v, ray->P, &ls);
|
|
|
|
float3 tp = throughput;
|
|
|
|
/* sample position on volume segment */
|
|
float rphase = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_PHASE);
|
|
float rscatter = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_SCATTER_DISTANCE);
|
|
|
|
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
|
|
state, ray, sd, &tp, rphase, rscatter, segment, (ls.t != FLT_MAX)? &ls.P: NULL, false);
|
|
|
|
(void)result;
|
|
kernel_assert(result == VOLUME_PATH_SCATTERED);
|
|
|
|
/* todo: split up light_sample so we don't have to call it again with new position */
|
|
if(lamp_light_sample(kg, i, light_u, light_v, sd->P, &ls)) {
|
|
if(kernel_data.integrator.pdf_triangles != 0.0f)
|
|
ls.pdf *= 2.0f;
|
|
|
|
float terminate = path_branched_rng_light_termination(kg, rng, state, j, num_samples);
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, state, tp*num_samples_inv, &L_light, shadow, num_samples_inv, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* mesh light sampling */
|
|
if(kernel_data.integrator.pdf_triangles != 0.0f) {
|
|
int num_samples = kernel_data.integrator.mesh_light_samples;
|
|
float num_samples_inv = 1.0f/num_samples;
|
|
|
|
for(int j = 0; j < num_samples; j++) {
|
|
/* sample random position on random triangle */
|
|
float light_t = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_LIGHT);
|
|
float light_u, light_v;
|
|
path_branched_rng_2D(kg, rng, state, j, num_samples, PRNG_LIGHT_U, &light_u, &light_v);
|
|
|
|
/* only sample triangle lights */
|
|
if(kernel_data.integrator.num_all_lights)
|
|
light_t = 0.5f*light_t;
|
|
|
|
LightSample ls;
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, ray->P, state->bounce, &ls);
|
|
|
|
float3 tp = throughput;
|
|
|
|
/* sample position on volume segment */
|
|
float rphase = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_PHASE);
|
|
float rscatter = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_SCATTER_DISTANCE);
|
|
|
|
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
|
|
state, ray, sd, &tp, rphase, rscatter, segment, (ls.t != FLT_MAX)? &ls.P: NULL, false);
|
|
|
|
(void)result;
|
|
kernel_assert(result == VOLUME_PATH_SCATTERED);
|
|
|
|
/* todo: split up light_sample so we don't have to call it again with new position */
|
|
if(light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls)) {
|
|
if(kernel_data.integrator.num_all_lights)
|
|
ls.pdf *= 2.0f;
|
|
|
|
float terminate = path_branched_rng_light_termination(kg, rng, state, j, num_samples);
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, state, tp*num_samples_inv, &L_light, shadow, num_samples_inv, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* sample random position on random light */
|
|
float light_t = path_state_rng_1D(kg, rng, state, PRNG_LIGHT);
|
|
float light_u, light_v;
|
|
path_state_rng_2D(kg, rng, state, PRNG_LIGHT_U, &light_u, &light_v);
|
|
|
|
LightSample ls;
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, ray->P, state->bounce, &ls);
|
|
|
|
float3 tp = throughput;
|
|
|
|
/* sample position on volume segment */
|
|
float rphase = path_state_rng_1D_for_decision(kg, rng, state, PRNG_PHASE);
|
|
float rscatter = path_state_rng_1D_for_decision(kg, rng, state, PRNG_SCATTER_DISTANCE);
|
|
|
|
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
|
|
state, ray, sd, &tp, rphase, rscatter, segment, (ls.t != FLT_MAX)? &ls.P: NULL, false);
|
|
|
|
(void)result;
|
|
kernel_assert(result == VOLUME_PATH_SCATTERED);
|
|
|
|
/* todo: split up light_sample so we don't have to call it again with new position */
|
|
if(light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls)) {
|
|
/* sample random light */
|
|
float terminate = path_state_rng_light_termination(kg, rng, state);
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, state, tp, &L_light, shadow, 1.0f, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif /* __EMISSION__ */
|
|
}
|
|
#endif /* __SPLIT_KERNEL__ */
|
|
|
|
#endif /* __VOLUME_SCATTER__ */
|
|
|
|
CCL_NAMESPACE_END
|
|
|