Curves + Array Modifier with Object Offset transform incorrect in Cycles when using Collections #61389
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Reference: blender/blender#61389
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System Information
Operating system: Windows 10 x64
Graphics card: nVidia GTX 1080 (latest 418.81 2019-02-04 GeForce Experience driver)
Blender Version
Broken: 2019-02-10 blender-2.80-0b6dbbc306b0-win64 (and previous daily builds)
Worked: 2.79b
Short description of error
Using the Array Modifier with Object Offset produces incorrect transform when using Collections
Exact steps for others to reproduce the error
Load Factory Settings, go into Preferences and enable CUDA for GPU+CPU in System tab
In 3D View, Add a Curve (Shift-A > Curve > Path)
Go into Edit mode, grab and move the curve path away from the origin/center, maybe modify it a bit so it's not straight, exit Edit mode
In the Curve settings tab add some Bevel Depth to the curve, so it's solid (Geometry > Bevel > Depth)
Add an Empty (Shift-A > Empty > Plain Axis)
Select the Curve, go to Modifiers tab and add an Array
Disable Relative Offset, enable Object Offset, select the Empty as the source, increase the Count a few times
Select the Empty, rotate it on the Z axis to make the arrayed/duped curves spin around the Empty
Switch Shading to Rendered (currently EEVEE), everything looks correct, as it did in the Solid Shading mode
Change rendering to Cycles, GPU Compute, everything looks correct
Switch back to Solid Shading
Create a new Collection in the top level of the Scene Collection in the Outliner, name it 'Curves'
Move the Curve and the Empty to the newly created Collection
Switch Shading to Rendered again, everything still looks correct, switch back to Solid
Select the default Collection in the Outliner, and in the 3D View, add a Collection Instance (Shift-A > Collection Instance > Curves)
Grab the Instance Empty and move it away from the origin so it's not overlapping the original
The same issue occurs if linking a Collection from an external .blend file too.
curves_array_object-offset_collection_bug_repro-001.blend
Added subscriber: @browneggz
#63379 was marked as duplicate of this issue
Added subscribers: @brecht, @JacquesLucke
I get an assert when I switch between rendered and lookdev mode in this file.
Seems to be some synching issue between Blender and Cycles.
(not sure if this is directly related to the original bug report, but could be...)
Added subscriber: @Acrivec
It seems to be connected to #63379.
Added subscriber: @ZedDB
Late reply, but this appears to be fixed in the 2.80 release. I Followed all the steps in the original repro again and everything looks good. 😄
Changed status from 'Open' to: 'Resolved'