Render Image for composited scene shows inconsistent results #95338
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opened 2022-01-30 20:44:23 +01:00 by Giant Squid
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Reference: blender/blender#95338
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System Information
Operating system: Windows 10
Graphics card: NVIDIA GEFORCE 1660 GTX
Blender Version
Broken: 3.0.0, Date: 2021-12-02 18:35
Worked: Unknown
Short description of error
A composite of two scenes will produce inconsistent results across F12 Render Image runs. Basically, if you change nothing, and simply hit F12 to bring up the "Render Result" window, you will sometimes see the expected result (two scenes composited together), and sometimes just one of the scenes without the other.
My project contains 3 simple scenes. One of the scenes renders text. Another modifies a mesh using geometry nodes. And the third scene composites the other two via compositor nodes. The compositing nodes are basic and consist of:
2 Render Layers, one of for each scene, which both feed their image into:
With this basic setup, you can now press F12 multiple times to bring up the Render Result window.
Observe that the contents of this window will vary across the renders. This is unexpected. Should always be the same.
Exact steps for others to reproduce the error
#95338.blend
Added subscriber: @giantsquid
REPRO STEPS USING SAMPLE PROJECT:
OBSERVE: Render Result window may not contain both scenes.
See attached screenshots demonstrating the two results I get when hitting F12 several times.
#95338.blend
Added subscriber: @mano-wii
I edited the report description to make it easier to understand, but I can't reproduce the problem no matter how many times I press F12 to render.
Many bugs are fixed between the official releases. Please try the latest development snapshot of blender: https://builder.blender.org/download
I can also repro this using 3.0.1, for what it's worth.
Took me 6-10 F12 runs to reproduce the issue, but it still happens.
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Confirmed'
I can reproduce this with eevee and cycles.
Added subscriber: @brecht
So far unable to reproduce this but sounds like a bug.
Changed status from 'Confirmed' to: 'Needs User Info'
I must have checked only with 3.0 (~5% success rate), re-checking now and I can't reproduce in 3.2
@giantsquid Please check if this still happens with latest alpha build from https://builder.blender.org/download/daily/. If it does, please report how often it happens.
This still repros with Blender 3.1 Beta, appears to have about the same error rate.
Changed status from 'Needs User Info' to: 'Needs Triage'
Added subscriber: @michael64
I bisected this down to
507a4deef1
which due to its small size can be neatly reverted on master for further debugging.Added subscriber: @lichtwerk
Thx! But how can this report from Jan 30 be caused by a commit from Feb 10?
When loading the the scene with 2.83.19 the white line is only rendered as a white plane but at least the green text is rendered every time.
With 2.93.0 the white line is never rendered and the green text only sometimes.
It seems like this error first appeared between these two versions and maybe as a side effect of some changes the error went away until
507a4deef1
brought it back to life.Version 2.92.0 is very deterministic in that it crashes immediately when I hit F12 but this could be a completely different error.
In Version 2.91.2 the green text is not shown the first 33 or so renders and then seemingly every time.
So, this issue looks interesting in a funny kind of way and I'll investigate a bit more.
Changed status from 'Needs Triage' to: 'Confirmed'
Thx again @michael64 .
Think this can be confirmed after all
507a4deef1
may have increased reproduction rate. before I wasn't able to confirm in 3.2, now I can confirm quite reliably (~20% success rate).When I pan image in editor, it suddenly updates. It does not update with 3.1
34d424fd64
. So issue was definitely there before507a4deef1
The error can be reproduced on Mac, Windows and Linux with 2.91.0 as the earliest release while 2.90.1 still worked.
Because of the old dependencies I could only build and bisect this on Linux and it looks like it was introduced in
4212b6528a
in which the "New Drawing" was enabled by default.This issue was referenced by
b04d42022f
Changed status from 'Confirmed' to: 'Resolved'