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Won't Fix

Votes

0

Found in

2020.3.40f1

2021.3.11f1

2022.1.19f1

2022.2.0b10

2023.1.0a13

Issue ID

UUM-16532

Regression

No

Various light-related events incur a CPU cost in scenes with baked lights

-

Steps to reproduce

  1. Download the attached project (BakedLightsCPUSpike-URP.zip)
  2. Open the EmptyScene
  3. Open the Profiler window, and in the search box, type in "light"
  4. Enter Play mode
  5. Press T on the keyboard to load a scene additively
  6. Scrub through the graph until you find the the events matching the "light" search query

Expected behavior

  • Light-related events should not incur a CPU cost when there are no realtime lights in the scene

Actual behavior

  • Various events incur multiple milliseconds worth of CPU time even when there are no realtime lights present (check the attached screenshot)

Notes

  • Reproduces in: 2020.3.40f1, 2021.3.11f1, 2022.1.13f1, 2022.2.0b8, 2023.1.0a11
  • Tested on macOS
  • Only reproduces upon the loading the scene initially; does not reproduce upon loading and unloading that same scene after it had been initialized

  1. Resolution Note:

    We are working on Forward+ and RenderGraph that is rewriting parts of these functions. The current runtime cost of these functions is in the order of 0.0x ms which is not enough user pain to justify we improve the old code path.

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