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Maniphest T79393

Eevee motion blur works the other way around
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Description

Operating system: Windows 10
Graphics card: Nvidia GTX 1050

Broken: 2.90 beta from July 29, 699cefefd009

If a collection with multiple objects is imported via linking into a scene and the camera is parented to it, with the collection being animated, background objects, which are moving in relation to the camera, are not blurred. However, the linked collection, stationary with respect to the camera, is blurred, when it should not be.

Exact steps:

Link the collection called "Cube" from file

202007defaultcubescene.blend786 KBDownload
into file
20200730motionblurbug_tobesent.blend828 KBDownload
, place it inside the tunnel, parent the camera to it and animate it along the X axis. When rendered in Eevee, the cubes are blurred but the warp particles are not, when it should be the other way around.

Related Objects

Event Timeline

Stefan (LaStefan) created this task.Jul 30 2020, 2:23 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).Jul 31 2020, 8:11 PM

This report is a little confused to understand.
There is already a report on a problem with Eevee's Motion Blur on linked objects.
Can you check if it's not the same problem? -> T78561: Eevee: No Motion Blur on linked objects

Stefan (LaStefan) added a comment.Aug 1 2020, 11:09 AM

It is similar, however it is the opposite: the linked collection has motion blur when it is not supposed to and the background objects have no motion blur when they are supposed to.

Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).Aug 2 2020, 12:15 AM

Result is really weird, though I suspect it will be closely connected to T78561

@Stefan (LaStefan) I will replace your file, if you don't agree with how I set up scene, do it yourself or be more exact with steps.

Richard Antalik (ISS) updated the task description. (Show Details)Aug 2 2020, 12:16 AM
Stefan (LaStefan) mentioned this in T79516: Linked collections have motion blur in Eevee when they are not supposed to.Aug 4 2020, 2:45 PM
Richard Antalik (ISS) added a comment.EditedAug 5 2020, 4:44 AM

Also looks very similar to T79515, so this is a combination of 2 issues.

I will merge this report into both reports, and when they will be fixed it would be good if this combined case was checked if all works as supposed

Richard Antalik (ISS) closed this task as a duplicate of T78561: Eevee: No Motion Blur on linked objects.Aug 5 2020, 4:44 AM
Richard Antalik (ISS) closed this task as a duplicate of T79515: No motion blur on moving particles in Eevee.