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Motion blur gives artifacts when changing the camera
Closed, ResolvedPublicBUG

Description

System Information:
Operating system: Windows 10
Graphics card: RTX 2080Ti
CPU: Intel i9 9900K

Blender Version:
Broken: Last 2.90 Beta a93be410c974

Short description of the error:
When changing the camera while having motion blur activated is gives artifacts in Eevee,

Exact steps for others to reproduce the error:
Open the file motion blur bug.blend in the Blender 2.9 and then press F12 and render the image and you will see artifacts because of the motion blur.

Is pretty obvious that is because motion blur doesn't take into consideration when the camera is changed and calculates the frames from the next camera as well. And it should calculate the frames only from the current camera.


Event Timeline

Is possible to be fixed in the following days? As we just finish our animation and we want to start to render this week.
Looking forward,

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.Aug 10 2020, 11:07 AM
Philipp Oeser (lichtwerk) changed the subtype of this task from "Report" to "Bug".

Can we have an answer on this, please?
Will be a shame for us to start the rendering now and find out that is solved after a few days 😅
But more important we gonna lose monies, as we render on aws.

If you need a workaround, just render the animation shot by shot with only one camera.

As of when it will be fixed, I think I can fix that today.

Clément Foucault (fclem) triaged this task as High priority.Aug 12 2020, 5:40 PM
Clément Foucault (fclem) edited projects, added BF Blender (2.90); removed BF Blender.

👏 👏 👏 Amazing news!!!!

But I can't render with one camera, because we make the scene layout using just one camera that we animate from one location to another (so we don't have to bother with 2 cameras to have more artistic freedom) (we use this method for faster management of the camera animation and keyframes because if we use 2 camera with binds that will be harder to manage and edit)
In our case, we use 1 camera, and later we use a trick to duplicate to have 2 cameras, >make a single user and expand the time of each shot in order to don't calculate the frames when camera change.

example: https://youtu.be/_0bdg4Vj1_g

However, thank you for solving this, we can render our animation with motion blur!!

Later we think to create a script to do this automatically 👍