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23c276832b
blender/intern/cycles/util
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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 Cycles: Add support of processor groups 2016-06-06 09:14:37 +02:00
util_algorithm.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_aligned_malloc.cpp Cycles: Some cleanup, should be no functional changes 2016-02-16 15:33:00 +01:00
util_aligned_malloc.h Cycles: Use size_t for aligned allocator 2015-02-19 22:19:29 +05:00
util_args.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_atomic.h Cycles: Code cleanup, spaces around keyword and brace 2015-06-01 19:49:52 +05:00
util_boundbox.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_color.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_debug.cpp Cycles: Make CUDA adaptive feature compile a Debug flag. 2016-05-06 23:13:33 +02:00
util_debug.h Cycles: Use explicit qualifier for single-argument constructors 2016-05-11 16:51:14 +02:00
util_foreach.h Optionally use c++11 stuff instead of boost in cycles where possible. We do and continue to depend on boost though 2015-03-29 22:12:40 +02:00
util_function.h Cycles: Correction to previous commit: non-msvc compilers also should use nullptr 2015-03-30 15:17:09 +05:00
util_guarded_allocator.cpp Cycles: Implement guarded allocator for STL classes 2015-02-15 02:01:48 +05:00
util_guarded_allocator.h Cycles: Stop rendering when bad_alloc happens 2016-04-20 16:19:49 +02:00
util_half.h Cycles: Support half and half4 textures. 2016-06-19 17:31:16 +02:00
util_hash.h Cycles: Code cleanup, spaces around keywords 2015-03-28 00:15:15 +05:00
util_image.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_list.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_logging.cpp Cycles: Be ready for gflags namespace auto-detect 2015-01-01 01:31:08 +05:00
util_logging.h Cycles: Log whch optimizations are used for CPU kernels 2016-01-06 20:25:19 +05:00
util_map.h Optionally use c++11 stuff instead of boost in cycles where possible. We do and continue to depend on boost though 2015-03-29 22:12:40 +02:00
util_math_cdf.cpp Cycles: Support user-defined shutter curve 2015-10-28 02:43:06 +05:00
util_math_cdf.h Cycles: Fix compilation error with MSVC 2015-10-28 17:33:31 +05:00
util_math_fast.h Code cleanup: resolve minor Cycles todo's. 2016-02-06 11:56:37 +01:00
util_math.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
util_md5.cpp Cycles: Cleanup, indentation and braces 2016-02-03 15:00:55 +01:00
util_md5.h Cycles: add utility function to calculate MD5 hash of a given string 2015-11-21 22:07:59 +05:00
util_opengl.h Cycles: Post-reintegration tweaks to ensure things do compile 2015-01-01 01:31:08 +05:00
util_optimization.h Cycles: Minor cleanup, whitespace around keyword and preprocessor indent 2016-04-13 08:58:52 +02:00
util_param.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_path.cpp Cycles: Use explicit qualifier for single-argument constructors 2016-05-11 16:51:14 +02:00
util_path.h Cycles: Re-implement some utilities to avoid use of boost 2016-02-06 19:19:20 +01:00
util_progress.h Fix Cycles compile errors with GCC due to double promotion as errors. 2016-05-22 19:17:22 +02:00
util_queue.h Cycles: Avoid recursion when doing constant fold 2015-12-02 16:19:39 +05:00
util_set.h Cycles: Re-implement some utilities to avoid use of boost 2016-02-06 19:19:20 +01:00
util_simd.cpp Cycles: Add an option to build single kernel only which fits current CPU 2016-03-25 16:09:05 +01:00
util_simd.h Cycles: Move non-vectorized bitscan() to util 2016-03-31 10:06:21 +02:00
util_sky_model_data.h Cleanup: Move Cycles sky model data to util. 2016-02-13 13:41:40 +01:00
util_sky_model.cpp Fix Cycles compile errors with GCC due to double promotion as errors. 2016-05-22 19:17:22 +02:00
util_sky_model.h Cleanup: Move Cycles sky model data to util. 2016-02-13 13:41:40 +01:00
util_sseb.h Cycles: add better specializations for SSE shuffle function and few more wrappers. 2015-03-07 17:25:21 +00:00
util_ssef.h Cycles: Cleanup, indentation and braces 2016-02-03 15:00:55 +01:00
util_ssei.h Cycles: add better specializations for SSE shuffle function and few more wrappers. 2015-03-07 17:25:21 +00:00
util_stack_allocator.h Cycles: Fix issues with stack allocator in MSVC 2016-04-25 13:50:27 +02:00
util_stats.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_string.cpp Cycles: Add human readable sizes to debug output 2016-05-31 06:13:54 -04:00
util_string.h Cycles: Add human readable sizes to debug output 2016-05-31 06:13:54 -04:00
util_system.cpp Cycles: Fix compilation error on OSX 2016-06-06 13:52:57 +02:00
util_system.h Cycles: Add support of processor groups 2016-06-06 09:14:37 +02:00
util_task.cpp Cycles: Add support of processor groups 2016-06-06 09:14:37 +02:00
util_task.h Cycles: Use explicit qualifier for single-argument constructors 2016-05-11 16:51:14 +02:00
util_texture.h Cycles: Support half and half4 textures. 2016-06-19 17:31:16 +02:00
util_thread.cpp Cycles: Add support of processor groups 2016-06-06 09:14:37 +02:00
util_thread.h Cycles: Add support of processor groups 2016-06-06 09:14:37 +02:00
util_time.cpp Cycles: Re-implement some utilities to avoid use of boost 2016-02-06 19:19:20 +01:00
util_time.h Cycles: Use explicit qualifier for single-argument constructors 2016-05-11 16:51:14 +02:00
util_transform.cpp Fix Cycles compile errors with GCC due to double promotion as errors. 2016-05-22 19:17:22 +02:00
util_transform.h Cycles: Fix compilation error of CUDA kernel after recent decomposition changes 2015-10-09 17:53:29 +05:00
util_types.h Cycles: Make Blender importer more forward compatible 2016-02-12 15:27:33 +01:00
util_vector.h Code refactor: add generic Cycles node infrastructure. 2016-05-22 17:29:24 +02:00
util_version.h Cleanup string includes after versioning commits 2016-04-13 09:45:32 +02:00
util_view.cpp Fix Cycles compile errors with GCC due to double promotion as errors. 2016-05-22 19:17:22 +02:00
util_view.h Cleanup: Fix Cycles Apache header. 2014-12-25 02:50:24 +01:00
util_windows.cpp Fix compilation error on 32 bit Windows 2016-06-06 14:01:49 +02:00
util_windows.h Cycles: Add support of processor groups 2016-06-06 09:14:37 +02:00
util_xml.h Cycles: Fix compilation error when OIIO is compiled with external PugiXML parser 2015-01-01 01:31:07 +05:00