Light linking: Initial support of shadow linking #106501

Merged
Sergey Sharybin merged 2 commits from Sergey/blender:cycles-light-linking-shadow into cycles-light-linking 2023-04-04 10:18:52 +02:00

The shadow linking is based on the Shadow State settings in the
light linking collection:

  • None: the object is not shadow linked to the emitter

  • Include: the object casts the shadow when lit by the emitter
    (and the emitter does not cast shadows from objects which are
    not linked to it).

  • Exclude: the object does not cast shadow when is lit by the
    emitter (but the emitter casts shadows from other objects).

Linking shadows to the emitter implicitly disables MIS for lamps.
This is because getting MIS+shadow linking to work needs more
time (and it's not that trivial). The MIS for mesh emitters is
not disabled automatically, as it is a bit tricky: the MIS is a
shader setting, not an object setting.

The MIS support will be worked on later.

Another limitation is the Metal RT support which does not support
shadow linking yet, Need to get a development environment where
compilation takes less than 10min per kernel.

Ref #104972

The shadow linking is based on the Shadow State settings in the light linking collection: - None: the object is not shadow linked to the emitter - Include: the object casts the shadow when lit by the emitter (and the emitter does not cast shadows from objects which are not linked to it). - Exclude: the object does not cast shadow when is lit by the emitter (but the emitter casts shadows from other objects). Linking shadows to the emitter implicitly disables MIS for lamps. This is because getting MIS+shadow linking to work needs more time (and it's not that trivial). The MIS for mesh emitters is not disabled automatically, as it is a bit tricky: the MIS is a shader setting, not an object setting. The MIS support will be worked on later. Another limitation is the Metal RT support which does not support shadow linking yet, Need to get a development environment where compilation takes less than 10min per kernel. Ref #104972
Sergey Sharybin added the
Module
Render & Cycles
label 2023-04-03 16:42:57 +02:00
Sergey Sharybin requested review from Brecht Van Lommel 2023-04-03 16:43:10 +02:00
Sergey Sharybin requested review from Weizhen Huang 2023-04-03 16:43:26 +02:00
Sergey Sharybin added this to the Render & Cycles project 2023-04-03 16:43:31 +02:00
Sergey Sharybin force-pushed cycles-light-linking-shadow from 4dcd1b15dd to 7724c87167 2023-04-03 16:55:01 +02:00 Compare
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Package build started. Download here when ready.

Package build started. [Download here](https://builder.blender.org/download/patch/PR106501) when ready.
Brecht Van Lommel approved these changes 2023-04-03 17:52:00 +02:00
Sergey Sharybin merged commit 7724c87167 into cycles-light-linking 2023-04-04 10:18:52 +02:00
Sergey Sharybin deleted branch cycles-light-linking-shadow 2023-04-04 10:18:53 +02:00
Brecht Van Lommel removed this from the Render & Cycles project 2023-05-24 19:05:21 +02:00
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