Rendering with Eevee motion blur changes the scene's subframes #81015

New Issue

Daniel Salazar · 2020-09-21T02:50:18+02:00

Daniel Salazar commented

2020-09-21 02:50:18 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1080 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.38

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-20 18:23, hash: e14894aad2

Short description of error
After rendering, objects are left at the position of their last subframe calculated during mblur subsampling, instead of reverting to the correct frame position.

Exact steps for others to reproduce the error
Disclamer: this scene is obviously an exagerated corner case to show the error.

open attached file
In Timeline -> Playback enable the Show - [ ] Subframes option
Adjust the frame so that the position of the cube is centered pretty much around the 3D cursor
Press F12
Press Esc after rendering
The Cube is seen shifted top the right
Scrub the timeline to fix
Interpolation.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1080 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.38 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-20 18:23, hash: `e14894aad2` **Short description of error** After rendering, objects are left at the position of their last subframe calculated during mblur subsampling, instead of reverting to the correct frame position. **Exact steps for others to reproduce the error** *Disclamer: this scene is obviously an exagerated corner case to show the error.* - open attached file - In `Timeline -> Playback` enable the `Show - [ ] Subframes` option - Adjust the frame so that the position of the cube is centered pretty much around the 3D cursor ![image.png](https://archive.blender.org/developer/F8904502/image.png) - Press F12 - Press Esc after rendering ![image.png](https://archive.blender.org/developer/F8904506/image.png) The Cube is seen shifted top the right Scrub the timeline to fix [Interpolation.blend](https://archive.blender.org/developer/F8904501/Interpolation.blend)

Daniel Salazar commented

2020-09-21 02:50:18 +02:00

Added subscriber: @zanqdo

Germano Cavalcante commented

2020-09-24 18:21:51 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-09-24 18:21:51 +02:00

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

Germano Cavalcante commented

2020-09-24 18:21:51 +02:00

I can confirm.
It only occurs with Eevee having motion enabled.
It is probably related to the #80086, but the steps here are simpler.
In the file, the object is not in the subframe shown in the image (I will edit the description).

I can confirm. It only occurs with Eevee having motion enabled. It is probably related to the #80086, but the steps here are simpler. In the file, the object is not in the subframe shown in the image (I will edit the description).

Germano Cavalcante changed title from ~~Multi Step Eevee Mblur leaves objects in incorrect position after rendering~~ to Rendering with Eevee motion blur changes the scene's subframes

2020-09-24 18:26:39 +02:00

Clément Foucault commented

2020-10-14 16:18:02 +02:00

Added subscriber: @fclem