Blender 2.9 Eevee motion blur doesn't take in account subframes when calculates its position #80086

New Issue

Andrey Sokolov · 2020-08-24T21:09:40+02:00

Andrey Sokolov commented

2020-08-24 21:09:40 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.67

Blender Version
Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-07-23 18:40, hash: 9cbf43801b
Worked: (newest version of Blender that worked as expected)

Short description of error
With scene.frame_set() Eevee motion blur takes in account only the current frame and ignores the subframe when calculates its position. It makes rendered objects visually remain the same during the whole frame. The same issue in Blender 2.91.

Exact steps for others to reproduce the error

open the new default project
animate default Cube rotation between frames 1 and 10 (for example 0 degrees on the X axis at the frame 1 and 90 degrees at the frame 10)
in the Render Settings turn on Motion Blur, optionally increase Steps and Shutter
on the Timeline set Cursor to frame 5, hit "F12" to render Image
when render is finished in the render Viewport change the render slot to 2
open Python Console, type in: bpy.context.scene.frame_set(5, subframe=0.9) - and hit "Enter"
compare 2 render slots to ensure that they are identical, and the Cube's state hadn't changed

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.67 **Blender Version** Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-07-23 18:40, hash: `9cbf43801b` Worked: (newest version of Blender that worked as expected) **Short description of error** With `scene.frame_set()` Eevee motion blur takes in account only the current frame and ignores the subframe when calculates its position. It makes rendered objects visually remain the same during the whole frame. The same issue in Blender 2.91. **Exact steps for others to reproduce the error** - open the new default project - animate default Cube rotation between frames 1 and 10 (for example 0 degrees on the X axis at the frame 1 and 90 degrees at the frame 10) - in the Render Settings turn on Motion Blur, optionally increase Steps and Shutter - on the Timeline set Cursor to frame 5, hit "F12" to render Image - when render is finished in the render Viewport change the render slot to 2 - open Python Console, type in: `bpy.context.scene.frame_set(5, subframe=0.9)` - and hit "Enter" - compare 2 render slots to ensure that they are identical, and the Cube's state hadn't changed

Andrey Sokolov commented

2020-08-24 21:09:40 +02:00

Added subscriber: @Andrey_Sokolov

RedMser commented

2020-08-24 22:08:23 +02:00

Added subscriber: @RedMser

Germano Cavalcante commented

2020-08-25 23:23:52 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-08-25 23:23:52 +02:00

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

Germano Cavalcante commented

2020-08-25 23:23:52 +02:00

I can confirm the problem.
Cycles considers subframes when rendering.
Here the file I used to test:
test_subframes.blend

I can confirm the problem. Cycles considers subframes when rendering. Here the file I used to test: [test_subframes.blend](https://archive.blender.org/developer/F8810983/test_subframes.blend)

blender-admin commented

2020-10-13 16:25:38 +02:00

This issue was referenced by ed96c59c20

This issue was referenced by ed96c59c20fb5f69edc9671b4efbcd4bf7f61ffb

Clément Foucault commented

2020-10-13 18:09:24 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2020-10-13 18:09:24 +02:00

Clément Foucault self-assigned this 2020-10-13 18:09:24 +02:00

Thomas Dinges added this to the 2.91 milestone 2023-02-08 16:20:48 +01:00

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Blender 2.9 Eevee motion blur doesn't take in account subframes when calculates its position #80086