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I'm trying to render an exploding bottle to compose it on a video, but no matter what I do I can't get the correct alphas in my output

Arnold just makes everything solid white (100% alpha)
The only thing that changes that is opacity, but it looks horrible when o turn down opacity, because it controls opacity of everything...

Is there a way to render the correct alphas with refraction without changing the opacity?
I don't want a black background on my render...

The Image doesn't have anything to do with what I'm doing, it's just to illustrate what I wanted to get, instead all the white part is solid white. With black background baked into it

I would think solid alpha is correct for glass. It refracts/distorts everything behind it, how would you get a correct-looking result if you had transparency?
This. Include your video footage in the 3D scene so it actually refracts and reflects in the bottle, then render.
Don't you just render the frame with refraction, render an alpha pass without refraction, mask the refraction using the alpha, then adjust as needed?
Why would you end up with a black background?

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