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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: remove SIMD BVH optimizations, to be replaced by Embree	Brecht Van Lommel
	Ref T73778 Depends on D8011 Maniphest Tasks: T73778 Differential Revision: https://developer.blender.org/D8012
2020-06-22	Cycles: remove __UV__ and __INSTANCING__ as kernel options	Brecht Van Lommel
	The kernel did not work correctly when these were disabled anyway. The optimized BVH traversal for the no instances case was also only used on the CPU, so no longer makes sense to keep. Ref T73778 Depends on D8010 Maniphest Tasks: T73778 Differential Revision: https://developer.blender.org/D8011
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:
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
2019-02-01	Cleanup: remove redundant, invalid info from headers	Campbell Barton
	BF-admins agree to remove header information that isn't useful, to reduce noise. - BEGIN/END license blocks Developers should add non license comments as separate comment blocks. No need for separator text. - Contributors This is often invalid, outdated or misleading especially when splitting files. It's more useful to git-blame to find out who has developed the code. See P901 for script to perform these edits.
2018-11-09	Cycles: Cleanup, spacing after preprocessor	Sergey Sharybin
	It is supposed to be two spaces before comment stating which if else/endif statements corresponds to. Was mainly violated in the header guards.
2018-08-29	Cycles: Add BVH8 and packeted triangle intersection	Sergey Sharybin
	This is an initial implementation of BVH8 optimization structure and packated triangle intersection. The aim is to get faster ray to scene intersection checks. Scene BVH4 BVH8 barbershop_interior 10:24.94 10:10.74 bmw27 02:41.25 02:38.83 classroom 08:16.49 07:56.15 fishy_cat 04:24.56 04:17.29 koro 06:03.06 06:01.45 pavillon_barcelona 09:21.26 09:02.98 victor 23:39.65 22:53.71 As memory goes, peak usage raises by about 4.7% in a complex scenes. Note that BVH8 is disabled when using OSL, this is because OSL kernel does not get per-microarchitecture optimizations and hence always considers BVH3 is used. Original BVH8 patch from Anton Gavrikov. Batched triangles intersection from Victoria Zhislina. Extra work and tests and fixes from Maxym Dmytrychenko.
2018-01-22	Cycles: Replace use_qbvh boolean flag with an enum-based property	Sergey Sharybin
	This was we can introduce other types of BVH, for example, wider ones, without causing too much mess around boolean flags. Thoughs: - Ideally device info should probably return bitflag of what BVH types it supports. It is possible to implement based on simple logic in device/ and mesh.cpp, rest of the changes will stay the same. - Not happy with workarounds in util_debug and duplicated enum in kernel. Maybe enbum should be stores in kernel, but then it's kind of weird to include kernel types from utils. Soudns some cyclkic dependency. Reviewers: brecht, maxim_d33 Reviewed By: brecht Differential Revision: https://developer.blender.org/D3011
2017-08-24	Fix Cycles CUDA transparent shadow error after recent fix in c22b52c.	Brecht Van Lommel
	Fishy cat benchmark was rendering with wrong shadows. Cause is unclear, adding printf or rearranging code seems to avoid this issue, possibly a compiler bug. This reverts the fix and solves the OSL bug elsewhere.
2017-08-19	Fix T52452: OSL trace broken after shadow catcher recent changes.	Brecht Van Lommel
	We should only early out with any hit in BVH traversal if the only visibility bits used are opaque shadow. Not when opaque shadow is one of multiple bits.
2017-08-07	Cycles: Cleanup, remove bvh prefix from curve functions	Sergey Sharybin
	Those are nothing to do with BVH, and can be used separately.
2017-08-07	Fix Cycles shadow catcher objects influencing each other.	Brecht Van Lommel
	Since all the shadow catchers are already assumed to be in the footage, the shadows they cast on each other are already in the footage too. So don't just let shadow catchers skip self, but all shadow catchers. Another justification is that it should not matter if the shadow catcher is modeled as one object or multiple separate objects, the resulting render should be the same. Differential Revision: https://developer.blender.org/D2763
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
2017-03-28	Cycles: Switch to reformulated Pluecker ray/triangle intersection	Sergey Sharybin
	The intention of this commit it to address issues mentioned in the reports T43865,T50164 and T50452. The code is based on Embree code with some extra vectorization to speed up single ray to single triangle intersection. Unfortunately, such a fix is not coming for free. There is some slowdown for AVX2 processors, mainly due to different vectorization code, which caused different number of instructions to be executed and different instructions-per-cycle counters. But on another hand this commit makes pre-AVX2 platforms such as AVX and SSE4.1 a bit faster. The prerformance goes as following: 2.78c AVX2 2.78c AVX Patch AVX2 Patch AVX BMW 05:21.09 06:05.34 05:32.97 (+3.5%) 05:34.97 (-8.5%) Classroom 16:55.36 18:24.51 17:10.41 (+1.4%) 17:15.87 (-6.3%) Fishy Cat 08:08.49 08:36.26 08:09.19 (+0.2%) 08:12.25 (-4.7% Koro 11:22.54 11:45.24 11:13.25 (-1.5%) 11:43.81 (-0.3%) Barcelone 14:18.32 16:09.46 14:15.20 (-0.4%) 14:25.15 (-10.8%) On GPU the performance is about 1.5-2% slower in my tests on GTX1080 but afraid we can't do much as a part of this chaneg here and consider it a price to pay for more proper intersection check. Made in collaboration with Maxym Dmytrychenko, big thanks to him! Reviewers: brecht, juicyfruit, lukasstockner97, dingto Differential Revision: https://developer.blender.org/D1574
2017-03-23	Cycles: Use SSE-optimized version of triangle intersection for motion triangles	Sergey Sharybin
	The title says it all actually. Gives up to 10% speedup on test scenes here on i7-6800K. Render times on GPU are unreliable here, but there might be some slowdown caused by watertight nature of intersections.
2017-03-23	Cycles: Move triangle intersection precalc to an util file	Sergey Sharybin
	This is a preparation work for the followup commit which wil l move remaining parts of Woop intersection logic to an utility file. Doing it as a separate commit to keep changes more atomic and easier to bisect when/if needed.
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.
2017-01-12	Cycles: Prepare BVH traversal code to work with multiple curve primitives ↵	Sergey Sharybin
	per node
2017-01-12	Cycles: Correct assert() for cases when there are multiple curves per BVH node	Sergey Sharybin

2017-01-12	Cycles: Use dedicated debug passes for traversed nodes and intersection tests	Sergey Sharybin
	This way it's more clear whether some issue is caused by lots of geometry in the node or by lots of "transparent" BVH nodes.
2016-10-03	Fix Cycles CUDA performance on CUDA 8.0.	Brecht Van Lommel
	Mostly this is making inlining match CUDA 7.5 in a few performance critical places. The end result is that performance is now better than before, possibly due to less register spilling or other CUDA 8.0 compiler improvements. On benchmarks scenes, there are 3% to 35% render time reductions. Stack memory usage is reduced a little too. Reviewed By: sergey Differential Revision: https://developer.blender.org/D2269
2016-08-01	Cycles: Tweaks to support CUDA 8 toolkit	Sergey Sharybin
	All the changes are mainly giving explicit tips on inlining functions, so they match how inlining worked with previous toolkit. This make kernel compiled by CUDA 8 render in average with same speed as previous kernels. Some scenes are somewhat faster, some of them are somewhat slower. But slowdown is within 1% so far. On a positive side it allows us to enable newer generation cards on buildbots (so GTX 10x0 will be officially supported soon).
2016-07-11	Cycles: Cleanup, variables name	Sergey Sharybin
	Using camel case for variables is something what didn't came from our original code, but rather from third party libraries. Let's avoid those as much as possible.
2016-07-11	Cycles: Move BVK kernel files to own directory	Sergey Sharybin
	BVH traversal is not really that much a geometry and we've got quite some traversals now. Makes sense to keep them separate in the name of source structure clarity.