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Rendering Transparent objects onto alpha

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Benjamin parker
Rendering Transparent objects onto alpha
on Dec 11, 2019 at 9:58:04 am

Hi My apologies if this is already resolved I imagine the answer is very simple but for the life of me I am not sure as to how to amend it.

I have a scene with an extremely simple molecule model.
The scene is lit and uses a white curved background which has seen by cam, refraction and transparency switched off in the composition tag.
One of the beads is using a glass material.
I need to render to a format that uses alpha, such as a PNG or TIFF image sequence.

However as you can see the refraction or reflection is picking up the blackness of the scene but isn't including it into the alpha.

Could someone please explain what is happening here and how I may be able to avoid this.

Many thanks

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