Bad motion blur from alembic animation import in v2.92. Works as expected in v2.83.13 #86654

New Issue

Mario Orlando · 2021-03-17T07:59:32+01:00

Mario Orlando commented

2021-03-17 07:59:32 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.72

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab
Worked: 2.83.13, branch: master, commit date: 2021-03-09 07:21, hash: bb50046730

Short description of error
Motion blur from alembic animation file is not correct in v2.92. Works as expected in v2.83.13

Exact steps for others to reproduce the error

Exported alembic animation from Maya
Imported the file into Blender 2.92.0
Render with Eevee or Cycles
Motion blur looks off
Open the same file in Blender 2.83
Render and it looks correct
Save the same file from v2.83
Open the same file in 2.92 and it now looks correct in 2.92

Something seems to be happening on import that is not set correctly. Just opening the same file in 2.83 seems and resaving using that version, seems to fix it whatever is broken. When I open the file back in 2.92 is fine from that point forward.
v2.92
v2.83

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.72 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` Worked: 2.83.13, branch: master, commit date: 2021-03-09 07:21, hash: `bb50046730` **Short description of error** Motion blur from alembic animation file is not correct in v2.92. Works as expected in v2.83.13 **Exact steps for others to reproduce the error** 1. Exported alembic animation from Maya 2. Imported the file into Blender 2.92.0 3. Render with Eevee or Cycles 4. Motion blur looks off 5. Open the same file in Blender 2.83 6. Render and it looks correct 7. Save the same file from v2.83 8. Open the same file in 2.92 and it now looks correct in 2.92 Something seems to be happening on import that is not set correctly. Just opening the same file in 2.83 seems and resaving using that version, seems to fix it whatever is broken. When I open the file back in 2.92 is fine from that point forward. ![Blender2_92_MotionBlur.png](https://archive.blender.org/developer/F9895948/Blender2_92_MotionBlur.png) **v2.92** ![Blender2_83_13_MotionBlur.png](https://archive.blender.org/developer/F9895977/Blender2_83_13_MotionBlur.png) **v2.83**

Mario Orlando commented

2021-03-17 07:59:32 +01:00

Added subscriber: @MarioAOrlando

Philipp Oeser commented

2021-03-17 09:31:38 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-17 09:31:38 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2021-03-17 09:31:38 +01:00

Just to make sure: could you share the .abc and your example .blend file?

Mario Orlando commented

2021-03-17 20:53:30 +01:00

Sure, here are the files.
MotionBlur_issue.blend

camera.abc

geometry.abc

Sure, here are the files. [MotionBlur_issue.blend](https://archive.blender.org/developer/F9896873/MotionBlur_issue.blend) [camera.abc](https://archive.blender.org/developer/F9896874/camera.abc) [geometry.abc](https://archive.blender.org/developer/F9896875/geometry.abc)

Ankit Meel commented

2021-03-28 16:05:50 +02:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Philipp Oeser commented

2021-04-01 13:32:39 +02:00

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

Philipp Oeser commented

2021-04-01 13:32:39 +02:00

Can confirm, will check.

Might be related to b5dcf74636.

Can confirm, will check. Might be related to b5dcf74636.

Philipp Oeser self-assigned this 2021-04-01 16:26:15 +02:00

Philipp Oeser commented

2021-04-01 16:26:15 +02:00

Vertex interpolation option introduced in bab2260b59 was defaulting to ON (correct) in that commit, but was lost in 8398050695
So if you have a file that was (incorrectly) imported with a version after 8398050695 you'll have to enable Vertex Interpolation option on every MeshSequenceCache modifier by hand.

Fix incoming.

Vertex interpolation option introduced in bab2260b59 was defaulting to ON (correct) in that commit, but was lost in 8398050695 So if you have a file that was (incorrectly) imported with a version after 8398050695 you'll have to enable Vertex Interpolation option on every `MeshSequenceCache` modifier by hand. Fix incoming.

blender-admin commented

2021-04-01 16:34:43 +02:00

This issue was referenced by fcc3227efd

This issue was referenced by fcc3227efd837de2733dd79d9f8baf9c3b6d01a8

Philipp Oeser commented

2021-04-02 21:23:12 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Philipp Oeser closed this issue

2021-04-02 21:23:12 +02:00

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Bad motion blur from alembic animation import in v2.92. Works as expected in v2.83.13 #86654