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Age	Commit message (Collapse)	Author
2018-02-09	Cycles: random walk subsurface scattering.	Brecht Van Lommel
	It is basically brute force volume scattering within the mesh, but part of the SSS code for faster performance. The main difference with actual volume scattering is that we assume the boundaries are diffuse and that all lighting is coming through this boundary from outside the volume. This gives much more accurate results for thin features and low density. Some challenges remain however: * Significantly more noisy than BSSRDF. Adding Dwivedi sampling may help here, but it's unclear still how much it helps in real world cases. * Due to this being a volumetric method, geometry like eyes or mouth can darken the skin on the outside. We may be able to reduce this effect, or users can compensate for it by reducing the scattering radius in such areas. * Sharp corners are quite bright. This matches actual volume rendering and results in some other renderers, but maybe not so much real world objects. Differential Revision: https://developer.blender.org/D3054
2018-02-08	Code refactor: tweaks in SSS code to prepare for coming changes.	Brecht Van Lommel
	This also fixes a subtle bug in the split kernel branched path SSS, the volume stack update can't be shared between multiple hit points.
2017-11-08	Code refactor: rename subsurface to local traversal, for reuse.	Brecht Van Lommel

2017-09-28	Cycles: reduce subsurface stack memory usage.	Brecht Van Lommel
	This is done by storing only a subset of PathRadiance, and by storing direct light immediately in the main PathRadiance. Saves about 10% of CUDA stack memory, and simplifies subsurface indirect ray code.
2017-09-20	Cycles: slightly improve BSDF sample stratification for path tracing.	Brecht Van Lommel
	Similar to what we did for area lights previously, this should help preserve stratification when using multiple BSDFs in theory. Improvements are not easily noticeable in practice though, because the number of BSDFs is usually low. Still nice to eliminate one sampling dimension.
2017-09-20	Code cleanup: refactor BSSRDF closure sampling, for next commit.	Brecht Van Lommel

2017-09-13	Code cleanup: abstract shadow catcher logic more into accumulation code.	Brecht Van Lommel

2017-08-21	Fix T52470: cycles OpenCL hair rendering not working after recent changes.	Brecht Van Lommel

2017-08-19	Code cleanup: move rng into path state.	Brecht Van Lommel
	Also pass by value and don't write back now that it is just a hash for seeding and no longer an LCG state. Together this makes CUDA a tiny bit faster in my tests, but mainly simplifies code.
2017-03-27	Cycles: Remove ccl_addr_space from RNG passed to functions	Hristo Gueorguiev
	Simplifies code quite a bit, making it shorter and easier to extend. Currently no functional changes for users, but is required for the upcoming work of shadow catcher support with OpenCL.
2017-03-09	Cycles: SSS and Volume rendering in split kernel	Hristo Gueorguiev
	Decoupled ray marching is not supported yet. Transparent shadows are always enabled for volume rendering. Changes in kernel/bvh and kernel/geom are from Sergey. This simiplifies code significantly, and prepares it for record-all transparent shadow function in split kernel.