Substance Painter
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# 1 20-10-2022 , 03:58 PM
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Join Date: Jan 2015
Posts: 1

Maya to Unreal Engine 5 Alembic Motion Blur

Hello all,

is anyone familiar with the workflow Unreal Alembic and Maya?
I just can’t get motion blur on my fluid simulation.
That it must work somehow shows the following video:

I have already asked in the Unreal forum and also in the comment section of the video, but get no response.
The only difference I have is that I use Maya to create my ABC cache insted of Houdini.
Otherwise I have been able to adopt everything.
Here are my settings:
Maya Almebic Cache export:

- Motion Vectors are baked into the geometry via Bifrost.
They look correct in the viewport. I don’t know if Unreal needs a specific name to recognize the vertex color as a motion vector so i tried
the following names for the vertex color:
- bifrost_velocity (The original name)
- velocityPV
- velocity

Alembic Export:
- UV Write: On
- Write Color Sets: On
- Write Visibility: On
- Write UV Sets: On
- File Format: Ogawa

I also added an attribute in tehe Attribute section "motionVectorColorSet "

Unreal Engine 5:
- Import Type: Geometry Cache
- Motion Vectors: Import Abc Velocities as Motion Vectors
- Project Settings> Rendering Settings> Default Settings> Motion Blur On
- Material Property: Output Translucent Velocity

All other objects have Motion Blur. Even another Alembic object.
However, one with a non-changing topology. Here I have chosen the other import function.

If I should have forgotten something I would be very grateful if someone could give me a tip.
I just can’t think of anything else I could change before I switch to Houdini.

Thanks in advance

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