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This never really worked as it was supposed to. The main goal of this is to turn noise from sampling tiny hairs into multiple layers of transparency that do not need to be sampled stochastically. However the implementation of this worked by randomly discarding hair intersections in BVH traversal, which defeats the purpose. If it ever comes back, it's best implemented outside the kernel as a preprocess that changes hair radius before BVH building. This would also make it work with Embree, where it's not supported now. But it's not so clear anymore that with many AA samples and GPU rendering this feature is as helpful as it once was for CPU raytracers with few AA samples. The benefit of removing this feature is improved hair ray tracing performance, tested on NVIDIA Titan Xp: bmw27: +0.37% classroom: +0.26% fishy_cat: -7.36% koro: -12.98% pabellon: -0.12% Differential Revision: https://developer.blender.org/D4532
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.