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File: 4L_ZRl3isHk.png (100 KB, 960x540)
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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

Heeeelp
>>
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?
>>
>>541877
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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