Disabling motion blur while persistent data is enabled results in objects disappearing or not rendering properly - Cycles OptiX #90666
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Reference: blender/blender#90666
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System Information
Operating system: Linux-5.10.0-8-amd64-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01
Blender Version
Broken version: 3.0.0 Alpha, branch: master, commit date: 2021-08-13 21:31, hash:
6a4533dd02
Broken version: 2.93.2 release
Worked: Unsure
Short description of error:
If
Motion Blur
is disabled whilePersistent Data
is enabled and the scene is re-rendered. The first re-render will result in animated objects rendering incorrectly or disappearing.This issue only occurs in OptiX in my testing. CUDA and CPU rendering are unaffected.
Exact steps for others to reproduce the error:
There are a few options:
#90666 - Motion Blurred objects rendering incorrectly.blend
OptiX
Or, you can follow the steps below to recreate the issue from a new file (video of steps also attached):
2021-08-14 16-10-32.mp4
GPU Compute
, specificallyOptiX
Motion Blur
andPersistent Data
in theProperties Editor
Properties Editor
disableMotion Blur
and re-render the frame. Notice how the cube is gone.Motion Blur
withPersistent Data
on.Note: If you rotate the object for your animation, the object will still be there, but it may render incorrectly. Specifically if you rotate the object and have a vector like
Object
from theTexture Coordinate
node driving part of it's visuals, it will render incorrectly. Here's an example file:#90666 - Motion Blur incorrect render - Rotation example.blend
In this scene, I'm rotating a sphere 70 degrees along the X axis in a single frame. I have used the
Object
output from theTexture Coordinate
for it's colour. When motion blur is disabled and the scene is rendered, you can see thatObject
from theTexture Coordinate
node is dimmed (all the values are lowered). When the scene is rendered again, the expected result shows up, a bright output.This is more noticeable if you use math in combination with an output like
Texture Coordinate
to define colours on the sphere. Because the values are lower in the initial re-render, the math will not produce the results you expect.Added subscriber: @Alaska
Persistent Data with motion blur invalidates "texture coordinate" and other mapping systems - OptiX Cyclesto Disabling motion blur while persistent data is enabled results in objects disappearing or not rendering properlyDisabling motion blur while persistent data is enabled results in objects disappearing or not rendering properlyto Disabling motion blur while persistent data is enabled results in objects disappearing or not rendering properly - Cycles OptiXAdded subscriber: @brecht
@brecht would you mind looking into this issue?
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Can confirm, even after cycles-x merge.
Added subscriber: @pmoursnv
CC @pmoursnv
This issue was referenced by blender/cycles@7ede918584
This issue was referenced by
3a65571195
Changed status from 'Confirmed' to: 'Resolved'