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author | Sebastian Herhoz <sebastian.herholz@intel.com> | 2022-09-21 18:58:34 +0300 |
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committer | Brecht Van Lommel <brecht@blender.org> | 2022-09-27 16:56:32 +0300 |
commit | 75a6d3abf75f3082adf5240ae34973844c0d9a09 (patch) | |
tree | 6967aea2480187db007cdc003bad14fbb372570d /intern/cycles/scene/osl.cpp | |
parent | 6d19da0b2d468f099e0c1f56392ab8a1750d114f (diff) |
Cycles: add Path Guiding on CPU through Intel OpenPGL
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
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