(Camera) Motion blur renders wrong (does not cancel out) when a mix of parenting and (baked) object animation is used #102521

New Issue

rafek yousef · 2022-11-15T09:04:49+01:00

rafek yousef commented

2022-11-15 09:04:49 +01:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA RTX A6000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94

Blender Version
Broken: version: 3.3.1, branch: master, commit date: 2022-10-04 18:35, hash: b292cfe5a9
Worked: (newest version of Blender that worked as expected)

Short description of error
when I parant a camera (looking for a simple cube) and the cube (who is the camera looking for it) to any other object, if the parent object is rotating, it will rendered fine but if I baked the action of the camera, and renderd the same frame it will be very in coorect motion blur, to fix the issue I have to bake the camera and all the objcects that appear on it,

Exact steps for others to reproduce the error

motion blur bug.blend
open the attached blend file, you will find a very simple scene with a camera, cube and a light are parented to a rotating empty object, just press render at frame 2 (which at the meddle of rotation) and it will render the motion blur very good (you will not see any motion blur which is logic because the camera and the cube are parended to the same object), but after that just bake only the camera (with selected object, visual keying and clear parent enabled) and render the same frame, it will give very unlogic motion blur, after that bake also the cube and the light and redner the same frame, it will render very good, this issue is only on rotating parent object bun in location it works very good, also I tested it on blender 2.7 and the same issue are there

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA RTX A6000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94 **Blender Version** Broken: version: 3.3.1, branch: master, commit date: 2022-10-04 18:35, hash: `b292cfe5a9` Worked: (newest version of Blender that worked as expected) **Short description of error** when I parant a camera (looking for a simple cube) and the cube (who is the camera looking for it) to any other object, if the parent object is rotating, it will rendered fine but if I baked the action of the camera, and renderd the same frame it will be very in coorect motion blur, to fix the issue I have to bake the camera and all the objcects that appear on it, **Exact steps for others to reproduce the error** [motion blur bug.blend](https://archive.blender.org/developer/F13916120/motion_blur_bug.blend) open the attached blend file, you will find a very simple scene with a camera, cube and a light are parented to a rotating empty object, just press render at frame 2 (which at the meddle of rotation) and it will render the motion blur very good (you will not see any motion blur which is logic because the camera and the cube are parended to the same object), but after that just bake only the camera (with selected object, visual keying and clear parent enabled) and render the same frame, it will give very unlogic motion blur, after that bake also the cube and the light and redner the same frame, it will render very good, this issue is only on rotating parent object bun in location it works very good, also I tested it on blender 2.7 and the same issue are there

rafek yousef commented

2022-11-15 09:04:49 +01:00

Added subscriber: @rfc

Philipp Oeser commented

2022-11-18 13:52:18 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-11-18 13:52:18 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2022-11-18 13:52:18 +01:00

Can confirm the issue.
I believe this has been reported before (but cannot find the duplicate atm.)
Same is true if the camera stays parented and the other objects are baked instead.

It is not mentioned here (but should, if it turns out to be a Known Limitation) https://docs.blender.org/manual/en/3.5/render/cycles/render_settings/motion_blur.html#limitations

Can confirm the issue. I believe this has been reported before (but cannot find the duplicate atm.) Same is true if the camera stays parented and the other objects are baked instead. It is not mentioned here (but should, if it turns out to be a Known Limitation) https://docs.blender.org/manual/en/3.5/render/cycles/render_settings/motion_blur.html#limitations

Philipp Oeser changed title from ~~Motion blur issue after baked camera~~ to (Camera) Motion blur renders wrong (does not cancel out) when a mix of parenting and (baked) object animation is used

2022-11-18 13:54:34 +01:00

Philipp Oeser removed the

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(Camera) Motion blur renders wrong (does not cancel out) when a mix of parenting and (baked) object animation is used #102521