Panoramic Capture with alpha for compositing

Hello,

I was wondering if anyone has been able to export panoramic captures (using the Panoramic Capture tool) with transparency. I’m trying to render a scene so it can be composited on existing 360 video. So far I’ve been only able to do this by using a green screen sphere around the scene. I can see there’s a SP.ForceAlpha setting which I’m guessing implies it should be possible but regardless of what I set that to I always get frames with black background instead of transparent (I’m assuming that an empty background in the scene should render as transparent?). Any help will be appreciated.

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you can try rendering with custom stencils on as a separate render for alpha