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23c276832b
blender/intern/cycles/kernel/shaders
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Lukas Stockner 23c276832b Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs 
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".

Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.

In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.

The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.

Reviewers: dingto, #cycles, brecht

Reviewed By: dingto, #cycles, brecht

Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel

Differential Revision: https://developer.blender.org/D2002
2016-06-23 22:57:26 +02:00
..
CMakeLists.txt CMake: Make OSL's .oso shaders building also dependent on OSL compiler! 2016-01-08 19:41:04 +01:00
node_absorption_volume.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_add_closure.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_ambient_occlusion.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_anisotropic_bsdf.osl Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs 2016-06-23 22:57:26 +02:00
node_attribute.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_background.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_blackbody.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_brick_texture.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_brightness.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_bump.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_camera.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_checker_texture.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_color.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_combine_hsv.osl Revert "Fix T42888: Separate and Combine HSV distorts the hue value" 2014-12-29 18:14:08 +05:00
node_combine_rgb.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_combine_xyz.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_convert_from_color.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_convert_from_float.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_convert_from_int.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_convert_from_normal.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_convert_from_point.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_convert_from_string.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_convert_from_vector.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_diffuse_bsdf.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_emission.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_environment_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_fresnel.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_fresnel.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_gamma.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_geometry.osl Fix T43651: New pointiness attribute doesn't work with displacement 2015-02-20 17:20:24 +05:00
node_glass_bsdf.osl Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs 2016-06-23 22:57:26 +02:00
node_glossy_bsdf.osl Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs 2016-06-23 22:57:26 +02:00
node_gradient_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_hair_bsdf.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_hair_info.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_holdout.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_hsv.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_image_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_invert.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_layer_weight.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_light_falloff.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_light_path.osl Cycles: Refactor how we pass bounce info to light path node. 2016-01-06 23:43:29 +01:00
node_magic_texture.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_mapping.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_math.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_mix_closure.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_mix.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_musgrave_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_noise_texture.osl Cleanup: Remove unused Noise Basis texture code. 2015-05-28 01:07:37 +02:00
node_normal_map.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_normal.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_object_info.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_output_displacement.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_output_surface.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_output_volume.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_particle_info.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_refraction_bsdf.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_rgb_curves.osl Code refactor: use dynamic shader node array lengths now that OSL supports them. 2016-05-17 21:39:16 +02:00
node_rgb_ramp.osl Code refactor: add separate RGB to BW node and rename some sockets. 2016-05-29 20:30:16 +02:00
node_scatter_volume.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_separate_hsv.osl Revert "Fix T42888: Separate and Combine HSV distorts the hue value" 2014-12-29 18:14:08 +05:00
node_separate_rgb.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_separate_xyz.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_set_normal.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_sky_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_subsurface_scattering.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_tangent.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_texture_coordinate.osl Cycles: Support texture coordinate from another object 2015-01-27 13:36:30 +05:00
node_texture.h Cleanup: Remove unused Noise Basis texture code. 2015-05-28 01:07:37 +02:00
node_toon_bsdf.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_translucent_bsdf.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_transparent_bsdf.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_uv_map.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_value.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_vector_curves.osl Code refactor: use dynamic shader node array lengths now that OSL supports them. 2016-05-17 21:39:16 +02:00
node_vector_math.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_vector_transform.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_velvet_bsdf.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_voronoi_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_voxel_texture.osl Cleanup: OSL style 2016-02-17 21:39:23 +11:00
node_wave_texture.osl Cycles: make shader node enums consistently lower case, update OSL shaders accordingly. 2016-06-11 23:50:11 +02:00
node_wavelength.osl Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
node_wireframe.osl Cycles: Add note about autodiff in OSL wireframe shader 2015-02-21 17:31:41 +05:00
oslutil.h Code refactor: use dynamic shader node array lengths now that OSL supports them. 2016-05-17 21:39:16 +02:00
stdosl.h Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs 2016-06-23 22:57:26 +02:00