Array Modifier Performance Issues between 2.79 & 2.8x #71259
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Reference: blender/blender#71259
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System Information
Operating system: WINDOWS 10
Graphics card: 2x RTX2080ti
CPU: Intel i7-6900k
Blender Version
Broken: 2.80, 2.81, 2.82
Worked: 2.79
Short description of error
Huge performance degradation animating an object with an array modifier(s)
Exact steps for others to reproduce the error
Delete default cube (of course)
Add Monkey
Array Modify Monkey count 40 / X direction only
Array Modify Monkey count 40 / Y direction only
Insert translation keyframe
Move timeline forward
Move array of monkeys
Insert translation keyframe
Play animation
2.79 - 24fps (Up that array count!)
2.80 - 3 fps (Oof!)
2.81 - 4 fps
2.82 - 5 fps
The work around for us was to use vertex instances of our geometry, however we have a lot of models in our library that use arrays so lots of scenes we load into 2.8 slow down immensely.
Added subscriber: @WilsonP
Added subscriber: @mano-wii
Could you provide a simple blend file demonstrating the problem?
Sure.
arraymodifyperformance.blend
Added subscriber: @Sergey
I can confirm.
In blender 2.79 the attached file could easily reach 60fps.
Apparently, starting from blender 2.80 the modifier is updated every frame.
@Sergey, is this a known limitation?
This issue was referenced by
a1747b058dChanged status from 'Open' to: 'Resolved'
Wonderful! Thanks Sergey.