Fix #108250: Cycles: Light Linking disabled after modifying object #108261
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Reference: blender/blender#108261
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Delete Branch "Sergey/blender:fix_108250"
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The runtime backup/restore logic was slightly wrong: it is possible that
an object requires light linking runtime but does not need light linking
itself. This is typical configuration for the receivers/blockers.
Modified the logic so that the evaluated object light linking is allocated
if there was a runtime field needed.
This required to make it so light linking evaluation takes care of feeing
the light_linking if it is empty. The downside of this approach is a
redundant allocation from the object backup when removing light linking
collection from emitter. But this is not a typical evaluation flow, and
the more typical flows are cheap with this approach.
@ -489,0 +490,4 @@
if (!need_runtime) {
/* Note that this will only remove lazily allocated light_linking on the evaluated object,
* as an empty light_linking is not allowed on the original object. */
BKE_light_linking_free_if_empty(&object_eval);
In this case it should still set the runtime when light linking was not freed? Otherwise it could have an outdated value.
That is a great point!