forked from bartvdbraak/blender
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!
368 lines
12 KiB
C
368 lines
12 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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#if defined(__BRANCHED_PATH__) || defined(__SUBSURFACE__) || defined(__SHADOW_TRICKS__)
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/* branched path tracing: connect path directly to position on one or more lights and add it to L */
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ccl_device_noinline void kernel_branched_path_surface_connect_light(
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KernelGlobals *kg,
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RNG *rng,
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ShaderData *sd,
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ShaderData *emission_sd,
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ccl_addr_space PathState *state,
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float3 throughput,
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float num_samples_adjust,
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PathRadiance *L,
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int sample_all_lights)
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{
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#ifdef __EMISSION__
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/* sample illumination from lights to find path contribution */
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if(!(sd->flag & SD_BSDF_HAS_EVAL))
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return;
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Ray light_ray;
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BsdfEval L_light;
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bool is_lamp;
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# ifdef __OBJECT_MOTION__
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light_ray.time = sd->time;
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# endif
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if(sample_all_lights) {
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/* lamp sampling */
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for(int i = 0; i < kernel_data.integrator.num_all_lights; i++) {
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if(UNLIKELY(light_select_reached_max_bounces(kg, i, state->bounce)))
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continue;
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int num_samples = ceil_to_int(num_samples_adjust*light_select_num_samples(kg, i));
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float num_samples_inv = num_samples_adjust/(num_samples*kernel_data.integrator.num_all_lights);
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RNG lamp_rng = cmj_hash(*rng, i);
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for(int j = 0; j < num_samples; j++) {
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float light_u, light_v;
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path_branched_rng_2D(kg, &lamp_rng, state, j, num_samples, PRNG_LIGHT_U, &light_u, &light_v);
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float terminate = path_branched_rng_light_termination(kg, &lamp_rng, state, j, num_samples);
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LightSample ls;
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if(lamp_light_sample(kg, i, light_u, light_v, sd->P, &ls)) {
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/* The sampling probability returned by lamp_light_sample assumes that all lights were sampled.
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* However, this code only samples lamps, so if the scene also had mesh lights, the real probability is twice as high. */
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if(kernel_data.integrator.pdf_triangles != 0.0f)
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ls.pdf *= 2.0f;
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if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
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/* trace shadow ray */
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float3 shadow;
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if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
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/* accumulate */
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path_radiance_accum_light(L, state, throughput*num_samples_inv, &L_light, shadow, num_samples_inv, is_lamp);
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}
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else {
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path_radiance_accum_total_light(L, state, throughput*num_samples_inv, &L_light);
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}
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}
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}
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}
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}
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/* mesh light sampling */
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if(kernel_data.integrator.pdf_triangles != 0.0f) {
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int num_samples = ceil_to_int(num_samples_adjust*kernel_data.integrator.mesh_light_samples);
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float num_samples_inv = num_samples_adjust/num_samples;
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for(int j = 0; j < num_samples; j++) {
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float light_t = path_branched_rng_1D(kg, rng, state, j, num_samples, PRNG_LIGHT);
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float light_u, light_v;
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path_branched_rng_2D(kg, rng, state, j, num_samples, PRNG_LIGHT_U, &light_u, &light_v);
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float terminate = path_branched_rng_light_termination(kg, rng, state, j, num_samples);
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/* only sample triangle lights */
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if(kernel_data.integrator.num_all_lights)
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light_t = 0.5f*light_t;
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LightSample ls;
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if(light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls)) {
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/* Same as above, probability needs to be corrected since the sampling was forced to select a mesh light. */
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if(kernel_data.integrator.num_all_lights)
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ls.pdf *= 2.0f;
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if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
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/* trace shadow ray */
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float3 shadow;
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if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
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/* accumulate */
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path_radiance_accum_light(L, state, throughput*num_samples_inv, &L_light, shadow, num_samples_inv, is_lamp);
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}
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else {
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path_radiance_accum_total_light(L, state, throughput*num_samples_inv, &L_light);
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}
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}
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}
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}
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}
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}
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else {
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/* sample one light at random */
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float light_t = path_state_rng_1D(kg, rng, state, PRNG_LIGHT);
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float light_u, light_v;
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path_state_rng_2D(kg, rng, state, PRNG_LIGHT_U, &light_u, &light_v);
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float terminate = path_state_rng_light_termination(kg, rng, state);
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LightSample ls;
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if(light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls)) {
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/* sample random light */
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if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
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/* trace shadow ray */
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float3 shadow;
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if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
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/* accumulate */
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path_radiance_accum_light(L, state, throughput*num_samples_adjust, &L_light, shadow, num_samples_adjust, is_lamp);
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}
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else {
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path_radiance_accum_total_light(L, state, throughput*num_samples_adjust, &L_light);
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}
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}
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}
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}
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#endif
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}
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/* branched path tracing: bounce off or through surface to with new direction stored in ray */
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ccl_device bool kernel_branched_path_surface_bounce(
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KernelGlobals *kg,
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RNG *rng,
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ShaderData *sd,
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const ShaderClosure *sc,
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int sample,
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int num_samples,
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ccl_addr_space float3 *throughput,
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ccl_addr_space PathState *state,
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PathRadiance *L,
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ccl_addr_space Ray *ray,
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float sum_sample_weight)
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{
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/* sample BSDF */
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float bsdf_pdf;
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BsdfEval bsdf_eval;
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float3 bsdf_omega_in;
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differential3 bsdf_domega_in;
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float bsdf_u, bsdf_v;
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path_branched_rng_2D(kg, rng, state, sample, num_samples, PRNG_BSDF_U, &bsdf_u, &bsdf_v);
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int label;
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label = shader_bsdf_sample_closure(kg, sd, sc, bsdf_u, bsdf_v, &bsdf_eval,
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&bsdf_omega_in, &bsdf_domega_in, &bsdf_pdf);
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if(bsdf_pdf == 0.0f || bsdf_eval_is_zero(&bsdf_eval))
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return false;
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/* modify throughput */
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path_radiance_bsdf_bounce(L, throughput, &bsdf_eval, bsdf_pdf, state->bounce, label);
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#ifdef __DENOISING_FEATURES__
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state->denoising_feature_weight *= sc->sample_weight / (sum_sample_weight * num_samples);
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#endif
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/* modify path state */
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path_state_next(kg, state, label);
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/* setup ray */
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ray->P = ray_offset(sd->P, (label & LABEL_TRANSMIT)? -sd->Ng: sd->Ng);
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ray->D = normalize(bsdf_omega_in);
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ray->t = FLT_MAX;
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#ifdef __RAY_DIFFERENTIALS__
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ray->dP = sd->dP;
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ray->dD = bsdf_domega_in;
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#endif
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#ifdef __OBJECT_MOTION__
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ray->time = sd->time;
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#endif
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#ifdef __VOLUME__
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/* enter/exit volume */
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if(label & LABEL_TRANSMIT)
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kernel_volume_stack_enter_exit(kg, sd, state->volume_stack);
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#endif
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/* branch RNG state */
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path_state_branch(state, sample, num_samples);
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/* set MIS state */
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state->min_ray_pdf = fminf(bsdf_pdf, FLT_MAX);
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state->ray_pdf = bsdf_pdf;
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#ifdef __LAMP_MIS__
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state->ray_t = 0.0f;
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#endif
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return true;
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}
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#endif
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/* path tracing: connect path directly to position on a light and add it to L */
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ccl_device_inline void kernel_path_surface_connect_light(KernelGlobals *kg, RNG *rng,
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ShaderData *sd, ShaderData *emission_sd, float3 throughput, ccl_addr_space PathState *state,
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PathRadiance *L)
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{
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#ifdef __EMISSION__
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if(!(kernel_data.integrator.use_direct_light && (sd->flag & SD_BSDF_HAS_EVAL)))
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return;
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#ifdef __SHADOW_TRICKS__
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if(state->flag & PATH_RAY_SHADOW_CATCHER) {
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kernel_branched_path_surface_connect_light(kg,
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rng,
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sd,
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emission_sd,
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state,
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throughput,
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1.0f,
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L,
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1);
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return;
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}
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#endif
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/* sample illumination from lights to find path contribution */
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float light_t = path_state_rng_1D(kg, rng, state, PRNG_LIGHT);
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float light_u, light_v;
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path_state_rng_2D(kg, rng, state, PRNG_LIGHT_U, &light_u, &light_v);
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Ray light_ray;
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BsdfEval L_light;
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bool is_lamp;
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#ifdef __OBJECT_MOTION__
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light_ray.time = sd->time;
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#endif
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LightSample ls;
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if(light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls)) {
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float terminate = path_state_rng_light_termination(kg, rng, state);
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if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp, terminate)) {
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/* trace shadow ray */
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float3 shadow;
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if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
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/* accumulate */
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path_radiance_accum_light(L, state, throughput, &L_light, shadow, 1.0f, is_lamp);
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}
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else {
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path_radiance_accum_total_light(L, state, throughput, &L_light);
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}
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}
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}
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#endif
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}
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/* path tracing: bounce off or through surface to with new direction stored in ray */
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ccl_device bool kernel_path_surface_bounce(KernelGlobals *kg,
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RNG *rng,
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ShaderData *sd,
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ccl_addr_space float3 *throughput,
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ccl_addr_space PathState *state,
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PathRadiance *L,
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ccl_addr_space Ray *ray)
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{
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/* no BSDF? we can stop here */
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if(sd->flag & SD_BSDF) {
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/* sample BSDF */
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float bsdf_pdf;
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BsdfEval bsdf_eval;
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float3 bsdf_omega_in;
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differential3 bsdf_domega_in;
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float bsdf_u, bsdf_v;
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path_state_rng_2D(kg, rng, state, PRNG_BSDF_U, &bsdf_u, &bsdf_v);
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int label;
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label = shader_bsdf_sample(kg, sd, bsdf_u, bsdf_v, &bsdf_eval,
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&bsdf_omega_in, &bsdf_domega_in, &bsdf_pdf);
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if(bsdf_pdf == 0.0f || bsdf_eval_is_zero(&bsdf_eval))
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return false;
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/* modify throughput */
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path_radiance_bsdf_bounce(L, throughput, &bsdf_eval, bsdf_pdf, state->bounce, label);
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/* set labels */
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if(!(label & LABEL_TRANSPARENT)) {
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state->ray_pdf = bsdf_pdf;
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#ifdef __LAMP_MIS__
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state->ray_t = 0.0f;
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#endif
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state->min_ray_pdf = fminf(bsdf_pdf, state->min_ray_pdf);
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}
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/* update path state */
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path_state_next(kg, state, label);
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/* setup ray */
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ray->P = ray_offset(sd->P, (label & LABEL_TRANSMIT)? -sd->Ng: sd->Ng);
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ray->D = normalize(bsdf_omega_in);
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if(state->bounce == 0)
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ray->t -= sd->ray_length; /* clipping works through transparent */
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else
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ray->t = FLT_MAX;
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#ifdef __RAY_DIFFERENTIALS__
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ray->dP = sd->dP;
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ray->dD = bsdf_domega_in;
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#endif
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#ifdef __VOLUME__
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/* enter/exit volume */
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if(label & LABEL_TRANSMIT)
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kernel_volume_stack_enter_exit(kg, sd, state->volume_stack);
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#endif
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return true;
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}
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#ifdef __VOLUME__
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else if(sd->flag & SD_HAS_ONLY_VOLUME) {
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/* no surface shader but have a volume shader? act transparent */
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/* update path state, count as transparent */
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path_state_next(kg, state, LABEL_TRANSPARENT);
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if(state->bounce == 0)
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ray->t -= sd->ray_length; /* clipping works through transparent */
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else
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ray->t = FLT_MAX;
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/* setup ray position, direction stays unchanged */
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ray->P = ray_offset(sd->P, -sd->Ng);
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#ifdef __RAY_DIFFERENTIALS__
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ray->dP = sd->dP;
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#endif
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/* enter/exit volume */
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kernel_volume_stack_enter_exit(kg, sd, state->volume_stack);
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return true;
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}
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#endif
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else {
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/* no bsdf or volume? */
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return false;
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}
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}
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CCL_NAMESPACE_END
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