I’m having some weird issues with alpha when rendering my sequence out of the Movie Render Queue. I’m running UE 5.5 on a Mac Studio with macOS 15.2 installed.
When viewing the rendered PNG’s in Finder, they don’t appear to have a transparent background at all. When I pull the sequence into After Effects (currently running version 25.1.0), the only transparency I’m seeing is in the upper left corner of the image. It’s static however, and doesn’t seem to animate.
I have “Alpha Output” enabled in my project settings. And here’s the render settings I’m using in MRQ:
Exports:
.png Sequence
- “Write Alpha” checked
Rendering:
Deferred Rendering
- “Accumlator Includes Alpha” checked
Settings:
Anti-aliasing
- “Override Anti Aliasing” checked
- “Anti Aliasing Method” set to “None”
Console Variables
- r.MotionBlurQuality = 4
- r.DepthOfFieldQualtiy = 4
- r.Tonemapper.Sharpen = 0 (if I leave this out, I get a weird white border around my objects, and still no alpha).
Game Overrides
- Default settings
What am I doing wrong here? The level itself consists of only my 3D assets, a directional light, and an HDRIBackdrop with it’s geometry component’s “Visible” setting turned off. I tried deleting the HDRIBackdrop entirely, just in case it was causing the problem, but it didn’t help.
Any insight would be much appreciated!