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Cycles: include more transparency and emission in fast GI approximation 

For indirect light rays, don't assume any hit is opaque, rather if it has
transparency or emission do the shading but don't do any further bounces.

Naturally this is slower when there are transparent surfaces, however
without this cutout opacity doesn't give sensible results.

Differential Revision: https://developer.blender.org/D10985
This commit is contained in:
Brecht Van Lommel 2021-04-15 16:21:37 +02:00
parent b42454be8b
commit d1fbf1599f
3 changed files with 18 additions and 3 deletions
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17
intern/cycles/kernel/kernel_path.h
View File

@ -65,7 +65,6 @@ ccl_device_forceinline bool kernel_path_scene_intersect(KernelGlobals *kg,
uint visibility = path_state_ray_visibility(kg, state);
if (path_state_ao_bounce(kg, state)) {
visibility = PATH_RAY_SHADOW;
ray->t = kernel_data.background.ao_distance;
}
@ -416,7 +415,13 @@ ccl_device void kernel_path_indirect(KernelGlobals *kg,
break;
}
else if (path_state_ao_bounce(kg, state)) {
break;
if (intersection_get_shader_flags(kg, &isect) &
(SD_HAS_TRANSPARENT_SHADOW | SD_HAS_EMISSION)) {
state->flag |= PATH_RAY_TERMINATE_AFTER_TRANSPARENT;
}
else {
break;
}
}
/* Setup shader data. */
@ -554,7 +559,13 @@ ccl_device_forceinline void kernel_path_integrate(KernelGlobals *kg,
break;
}
else if (path_state_ao_bounce(kg, state)) {
break;
if (intersection_get_shader_flags(kg, &isect) &
(SD_HAS_TRANSPARENT_SHADOW | SD_HAS_EMISSION)) {
state->flag |= PATH_RAY_TERMINATE_AFTER_TRANSPARENT;
}
else {
break;
}
}
/* Setup shader data. */

2
intern/cycles/kernel/kernel_types.h
View File

@ -895,6 +895,8 @@ enum ShaderDataFlag {
SD_HAS_CONSTANT_EMISSION = (1 << 27),
/* Needs to access attributes for volume rendering */
SD_NEED_VOLUME_ATTRIBUTES = (1 << 28),
/* Shader has emission */
SD_HAS_EMISSION = (1 << 29),
SD_SHADER_FLAGS = (SD_USE_MIS | SD_HAS_TRANSPARENT_SHADOW | SD_HAS_VOLUME | SD_HAS_ONLY_VOLUME |
SD_HETEROGENEOUS_VOLUME | SD_HAS_BSSRDF_BUMP | SD_VOLUME_EQUIANGULAR |

2
intern/cycles/render/shader.cpp
View File

@ -528,6 +528,8 @@ void ShaderManager::device_update_common(Device *device,
if (shader->get_use_mis())
flag |= SD_USE_MIS;
if (shader->has_surface_emission)
flag |= SD_HAS_EMISSION;
if (shader->has_surface_transparent && shader->get_use_transparent_shadow())
flag |= SD_HAS_TRANSPARENT_SHADOW;
if (shader->has_volume) {