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Age	Commit message (Collapse)	Author
2020-06-22	Cycles: internal refactoring to make thick/ribbon curve separate primitives	Brecht Van Lommel
	Also removing the curve system manager which only stored a few curve intersection settings. These are all changes towards making shape and subdivision settings per-object instead of per-scene, but there is more work to do here. Ref T73778 Depends on D8013 Maniphest Tasks: T73778 Differential Revision: https://developer.blender.org/D8014
2020-06-22	Cycles: port curve-ray intersection from Embree for use in Cycles GPU	Brecht Van Lommel
	This keeps render results compatible for combined CPU + GPU rendering. Peformance and quality primitives is quite different than before. There are now two options: * Rounded Ribbon: render hair as flat ribbon with (fake) rounded normals, for fast rendering. Hair curves are subdivided with a fixed number of user specified subdivisions. This gives relatively good results, especially when used with the Principled Hair BSDF and hair viewed from a typical distance. There are artifacts when viewed closed up, though this was also the case with all previous primitives (but different ones). * 3D Curve: render hair as 3D curve, for accurate results when viewing hair close up. This automatically subdivides the curve until it is smooth. This gives higher quality than any of the previous primitives, but does come at a performance cost and is somewhat slower than our previous Thick curves. The main problem here is performance. For CPU and OpenCL rendering performance seems usually quite close or better for similar quality results. However for CUDA and Optix, performance of 3D curve intersection is problematic, with e.g. 1.45x longer render time in Koro (though there is no equivalent quality and rounded ribbons seem fine for that scene). Any help or ideas to optimize this are welcome. Ref T73778 Depends on D8012 Maniphest Tasks: T73778 Differential Revision: https://developer.blender.org/D8013
2020-06-22	Cycles: always perform backface culling for curve, remove option	Brecht Van Lommel
	The hair BSDFs are already designed to assume this, and disabling backface culling would break them in some cases. Ref T73778 Depends on D8009 Maniphest Tasks: T73778 Differential Revision: https://developer.blender.org/D8010
2020-06-22	Cycles: remove support for rendering hair as triangle and lines	Brecht Van Lommel
	Triangles were very memory intensive. The only reason they were not removed yet is that they gave more accurate results, but there will be an accurate 3D curve primitive added for this. Line rendering was always poor quality since the ends do not match up. To keep CPU and GPU compatibility we just remove them entirely. They could be brought back if an Embree compatible implementation is added, but it's not clear to me that there is a use case for these that we'd consider important. Ref T73778 Reviewers: #cycles Subscribers:
2020-03-19	Cleanup: `make format` after SortedIncludes change	Dalai Felinto

2019-04-24	Cycles: remove hair minimum width support.	Brecht Van Lommel
	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
2019-04-17	ClangFormat: apply to source, most of intern	Campbell Barton
	Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2018-07-06	Cleanup: strip trailing space for cycles	Campbell Barton

2017-03-29	Cycles: Make all #include statements relative to cycles source directory	Sergey Sharybin
	The idea is to make include statements more explicit and obvious where the file is coming from, additionally reducing chance of wrong header being picked up. For example, it was not obvious whether bvh.h was refferring to builder or traversal, whenter node.h is a generic graph node or a shader node and cases like that. Surely this might look obvious for the active developers, but after some time of not touching the code it becomes less obvious where file is coming from. This was briefly mentioned in T50824 and seems @brecht is fine with such explicitness, but need to agree with all active developers before committing this. Please note that this patch is lacking changes related on GPU/OpenCL support. This will be solved if/when we all agree this is a good idea to move forward. Reviewers: brecht, lukasstockner97, maiself, nirved, dingto, juicyfruit, swerner Reviewed By: lukasstockner97, maiself, nirved, dingto Subscribers: brecht Differential Revision: https://developer.blender.org/D2586
2015-03-27	Cycles: Code cleanup, prepare for strict C++ flags	Sergey Sharybin

2014-12-25	Cleanup: Fix Cycles Apache header.	Thomas Dinges
	This was already mixed a bit, but the dot belongs there.
2014-06-13	Cycles Refactor: Add SSE Utility code from Embree for cleaner SSE code.	Thomas Dinges
	This makes the code a bit easier to understand, and might come in handy if we want to reuse more Embree code. Differential Revision: https://developer.blender.org/D482 Code by Brecht, with fixes by Lockal, Sergey and myself.
2014-05-04	Style cleanup: indentation, braces	Campbell Barton

2014-02-02	Code cleanup / Cycles: Remove encasing_ratio variable, it was already hard ↵	Thomas Dinges
	coded, so define it in the kernel only.
2013-12-26	Cycles / Hair: Further cleanup of UI and internals.	Thomas Dinges
	* UI: Remove deprecated condition (CURVE_RIBBONS) and hide backface property, when it's hardcoded in C (Curve/Line segments && Ribbons). * Remove "use_tangent_normal" and "CURVE_KN_TANGENTGNORMAL" as its unused (follow up for last commit).
2013-12-14	Code cleanup / Cycles: Remove some unused hair code.	Thomas Dinges

2013-08-23	Code cleanup / Cycles:	Thomas Dinges
	* Some style tweaks for hair code.
2013-08-18	Cycles: relicense GNU GPL source code to Apache version 2.0.	Brecht Van Lommel
	More information in this post: http://code.blender.org/ Thanks to all contributes for giving their permission!
2013-08-18	Updates for the Cycle Hair UI. With the following changes	Stuart Broadfoot
	- Removed the cycles subdivision and interpolation of hairkeys. - Removed the parent settings. - Removed all of the advanced settings and presets. - This simplifies the UI to a few settings for the primitive type and a shape mode.
2013-08-11	Code cleanup / Cycles:	Thomas Dinges
	* Rename "curve_kernel_data" to just "curve", to avoid redundant naming.
2013-04-16	Cycles Hair: Strand Minimum Pixel Size	Stuart Broadfoot
	Code is added to restrict the pixel size of strands in cycles. It works best with ribbon primitives and a preset for these is included. It uses distance dependent expansion of the strands and then stochastic strand removal to give a fading. To prevent a slowdown for triangle mesh objects in the BVH an extra visibility flag has been added. It is also only applied for camera rays. The strand width settings are also changed, so that the particle size is not included in the width calculation. Instead there is a separate particle system parameter for width scaling.
2013-01-23	Cycles Hair: Multiple vertex colours and UV coordinates	Stuart Broadfoot
	Added export of multiple UV coordinates and vertex colour attributes. A debugging option to export the strands without using the cache has also been removed.
2013-01-15	Cycles Hair: Introduction of Cardinal Spline Curve Segments and minor fixes.	Stuart Broadfoot
	The curve segment primitive has been added. This includes an intersection function and changes to the BVH. A few small errors in the line segment intersection routine are also fixed.
2012-12-28	New feature	Stuart Broadfoot
	Patch [#33445] - Experimental Cycles Hair Rendering (CPU only) This patch allows hair data to be exported to cycles and introduces a new line segment primitive to render with. The UI appears under the particle tab and there is a new hair info node available. It is only available under the experimental feature set and for cpu rendering.