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EEVEE Transparent mask + baked lighting optimisation issue
Closed, ResolvedPublicBUG

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89

Blender Version
Broken: version: 2.93.0, branch: master, commit date: 2021-02-13 14:43, hash: rB7f7e6830991bf66e285fb54cdbae6c6618ed7afa
Worked: Previous commit

Short description of error
I have a house with some trees around it that use a masked transparancy for the leaves.
When i bake the lighting for eevee (irradiance probes + several reflection cubes) the impact of these trees is massive. in 2.92 i had about 60fps, and in 2.93 its down to 10fps (when hiding the vegetation collection, it basicly runs like the 2.92 version with vegetation)
When i have a sunlight shining trough these masked leaves, it runs fine. but when the scene has baked eevee lighting, the performance goes down alot.

Exact steps for others to reproduce the error
Opening my attached scene 2.92, bake the indirect lighting as it is set up, and view the rendered viewport. Now repeat these steps in 2.93 (everything in this file is deleted exept the relevant items for this bug)

Event Timeline

Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.Thu, Apr 29, 4:49 AM
Germano Cavalcante (mano-wii) triaged this task as High priority.
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".

I can't see any visual differences.
But I notice a decrease in performance and a consistent crash.
I will do the bisect to find which commit introduced this.


Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce MX250/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 466.11
Blender Version: 3.0.0 Alpha, branch: master, commit date: 2021-04-28 22:27, hash: rB14f59a03498b

i can cofnirm the problem on my rx 6800, fps is very low with baked trees!