If there is an animated curve and Motion Blur + Persistent Data are enabled, the curves will randomly appear and disappear. Here is a simplified file that reproduces the issue on master. Render the animation an notice how the curves flicker.
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Display Graphics card: Radeon RX 580 Series 4.5.14800 Core Profile Context 22.3.1 30.0.15002.1004
CUDA enabled Graphics card: NVIDIA GeForce GTX 1650 Driver version. DCH 472.12
CPU: Ryzen 7 2700 (16 threads, 8 cores)
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: rBe05e1e369187
Worked: (newest version of Blender that worked as expected)
Description of error
Objects disappear from what seems to be random frames close to the beginning of keyframed object transformations in renders produced with Cycles (only).
This appears to be the same bug as archived T40313.
Bug is more prevalent in blender version: 3.1.2 however is still present.
This Project was using AnimAll addon to animate some of the objects featuring the glitch, these appare to be the only ones still glitching in 3.2. However testing this Addon in a controlled environment does not feature this behaviour, which might suggest its cause is elsewhere, but might be aggravated by animating individual vertices.
Exact steps for others to reproduce the error
- Open Attached Blend file
- Render Animation in Cycles using files settings.
This render was made using GPU Compute with CUDA and CPU enabled in system preferences.
Edit: works on CPU only also. Updated .Blend file with packed textures.
File removed now simplified is available