Odd Eevee performance issue #71325
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Reference: blender/blender#71325
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System Information
Operating system: OSX 10.15.1
Graphics card: D 700
Blender Version
Broken: v2.80, v2.81 beta (
07968604ab
)Short description of error
Eevee performance drops drastically depending on order of materials on an object.
Exact steps for others to reproduce the error
rep1.blend
The geometry doesn't seem to matter. No errors in the terminal either. If I can help test in any other way, please let me know.
Added subscriber: @DineshKumar
I have tested the same scene on my MBP mid 2015, same OS.
With Intel Iris Pro forced - no issue
With Radeon R9 M370X forced - same issue happens
Added subscriber: @filibis
I can't reproduce this on Windows, everything runs smoothly.
System Information
Windows-10 64 Bits
GeForce GTX 1070 NVIDIA 431.70
Blender Version
2.81 (sub 15), branch: master, commit date: 2019-10-21 18:07, hash:
388c954cb5
Added subscriber: @D7470
Cannot reproduce.
Windows 10, GTX 1080, Nvidia 441.12 drivers
Blender 2.8 (
f6cb5f5449
) and Blender 2.81 (8ab6ef30ab
)Added subscriber: @mano-wii
I also can't reproduce the problem on Windows. Must be MacOS related.
Added subscriber: @JohnTheThird
As I noted here https://developer.blender.org/T72051 if you set the metallic prop of the BSDF shader for Material.006 to .99 or less the viewport does NOT lag. Only if metallic is 1 does it lag.
MacBook Pro/AMD Radeon Pro 5500M 8 GB/Catalina 10.15.2
Lag happens in Blender 2.80.75 and 2.81.16 and 2.82.6
After some late night spelunking, I narrowed the problem down to
node_shader_bsdf_principled.c
where an optimized version of the principled shader is used if the node settings are exactly 1 (or not 1) for some settings. If I patch that on Apple so that the default shader is always used, the lag is gone on therep1.blend
andpinata_bug.blend
files attached to these tickets. However, thearchviz.blend
file (a much bigger scene with lots more materials) from one of the other EEVEE lag tickets did not improve and still lagged, with the same continual calls toSCCompileShader
in AMDRadeonX6000GLDriver. So the actual problem is probably in the GLSL shaders somewhere? If anyone else is interested in the patch it is here on github:8416412d8b
Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'
Closed as duplicate of #66231