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Age	Commit message (Collapse)	Author
2022-09-27	Cycles: add Path Guiding on CPU through Intel OpenPGL	Sebastian Herhoz
	This adds path guiding features into Cycles by integrating Intel's Open Path Guiding Library. It can be enabled in the Sampling > Path Guiding panel in the render properties. This feature helps reduce noise in scenes where finding a path to light is difficult for regular path tracing. The current implementation supports guiding directional sampling decisions on surfaces, when the material contains a least one diffuse component, and in volumes with isotropic and anisotropic Henyey-Greenstein phase functions. On surfaces, the guided sampling decision is proportional to the product of the incident radiance and the normal-oriented cosine lobe and in volumes it is proportional to the product of the incident radiance and the phase function. The incident radiance field of a scene is learned and updated during rendering after each per-frame rendering iteration/progression. At the moment, path guiding is only supported by the CPU backend. Support for GPU backends will be added in future versions of OpenPGL. Ref T92571 Differential Revision: https://developer.blender.org/D15286
2022-09-02	Cleanup: split surface/displacement/volume shader eval into separate files	Brecht Van Lommel

2022-09-02	Cleanup: refactoring of kernel film function names and organization	Brecht Van Lommel

2022-08-09	Cycles: add new Spectrum and PackedSpectrum types	Andrii Symkin
	These replace float3 and packed_float3 in various places in the kernel where a spectral color representation will be used in the future. That representation will require more than 3 channels and conversion to from/RGB. The kernel code was refactored to remove the assumption that Spectrum and RGB colors are the same thing. There are no functional changes, Spectrum is still a float3 and the conversion functions are no-ops. Differential Revision: https://developer.blender.org/D15535
2022-07-15	Cycles: refactor rays to have start and end distance, fix precision issues	Brecht Van Lommel
	For transparency, volume and light intersection rays, adjust these distances rather than the ray start position. This way we increment the start distance by the smallest possible float increment to avoid self intersections, and be sure it works as the distance compared to be will be exactly the same as before, due to the ray start position and direction remaining the same. Fix T98764, T96537, hair ray tracing precision issues. Differential Revision: https://developer.blender.org/D15455
2022-07-15	Cleanup: make format	Brecht Van Lommel

2022-07-14	Cleanup: replace state flow macros in the kernel with functions	Brecht Van Lommel

2022-02-11	Cycles: use SPDX license headers	Brecht Van Lommel
	* Replace license text in headers with SPDX identifiers. * Remove specific license info from outdated readme.txt, instead leave details to the source files. * Add list of SPDX license identifiers used, and corresponding license texts. * Update copyright dates while we're at it. Ref D14069, T95597
2022-01-26	Cycles: remove ray offsetting	William Leeson
	Remove small ray offsets that were used to avoid self intersection, and leave that to the newly added primitive object/prim comparison. These changes together significantly reduce artifacts on small, large or far away objects. The balance here is that overlapping primitives are not handled well and should be avoided (though this was already an issue). The upside is that this is something a user has control over, whereas the other artifacts had no good manual solution in many cases. There is a known issue where the Blender particle system generates overlapping objects and in turn leads to render differences between CPU and GPU. This will be addressed separately. Differential Revision: https://developer.blender.org/D12954
2022-01-26	Cycles: explicitly skip self-intersection	William Leeson
	Remember the last intersected primitive and skip any intersections with the same primitive. Ref D12954
2021-11-16	Cycles: Adapt volumetric lambda functions to work on MSL	Michael Jones
	This patch adapts the existing volumetric read/write lambda functions for Metal. Lambda expressions are not supported on MSL, so two new macros `VOLUME_READ_LAMBDA` and `VOLUME_WRITE_LAMBDA` have been defined with a default implementation which, on Metal, is overridden to use inline function objects. This patch also removes the last remaining mention of the now-unused `ccl_addr_space`. Ref T92212 Reviewed By: leesonw Maniphest Tasks: T92212 Differential Revision: https://developer.blender.org/D13234
2021-10-26	Cycles: remove prefix from source code file names	Brecht Van Lommel
	Remove prefix of filenames that is the same as the folder name. This used to help when #includes were using individual files, but now they are always relative to the cycles root directory and so the prefixes are redundant. For patches and branches, git merge and rebase should be able to detect the renames and move over code to the right file.