Generated texture coordinates incorrect on file load in presence of modifiers #73944
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Reference: blender/blender#73944
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00
Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash:
77d23b0bd7Also broken: 2.83 alpha, hash
f6d5a95513Short description of error
Generated texture coordinates are using modified vertex position on file load, apparently until those modifiers are edited, for rendered preview (only). Actual rendering appears to use generated texture coordinates from unmodified vertex position.
Exact steps for others to reproduce the error
Here's a file with a candy stripe material using generated texture coordinates, with a simple deform/twist modifier:
gentest.blend
Open it up, don't change anything, and switch to a rendered preview:
Render and compare:
Editing the twist angle on the modifier updates the generated coords to work appropriately, and can be considered a work-around, but it's painful to do this on every file load, for every deformed object using generated texture coordinates.
Added subscriber: @vasiln
Added subscriber: @JacquesLucke
Changed status from 'Needs Triage' to: 'Confirmed'
I can confirm that the generated coordinates on the object are different when comparing the viewport and a render. This is true for Cycles and Eevee.
Added subscriber: @ankitm
@JacquesLucke is this also related then #73956 ?
I don't know if it is related. The issue you linked does not have enough information to determine that yet.
Added subscriber: @fclem
The workaround does not even seem to work now. I guess it's a bug in the modifier stack evaluation that think it can skip ORCO since we are in solid shading mode at first.
This happens for all deforming modifiers.
Added subscriber: @AaronBeller
Hey everybody,
I was about to write a new bug report when I found this open task. I was running into the same issue when using the array & curve modifiers. I couldn't reliably reproduce the bug though. Sometimes (not every time) the generated coordinates are scrambled when loading the file. One time changing the shading from flat to smooth would change the displayed coordinates. Changing the position of the subsurf modifier in the stack back an d forth solved the issue most of the time but again not always.
Wrong coordinates
Right coordinates
Here's my system information just in case:
System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89
Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-05-29 16:16, hash:
f5d14e36e8And here's the file:
GeneratedCoordinates_Bug.blend
I'm not sure if this adds any new information to the case but I figured it might help. So thank you for looking into it and keep up your amazing work!
Best regards
Aaron