Cycles - transparent background still renders background color through glass? Im having an issue with glass rendered where there isn't something IMMEDIATELY behind it - either objects are in distance or there actually isn't anything there. I need it to render CLEAR, meaning whatever is in background even if it is far off, like how this renders actually the transparent background texture default:
Alpha channel through glass material instead of background (Cycles)

I just have a normal glass setup, with a mix shader between transparent and glass nodes. Problem is, when I look at my glass where isn't something RIGHT behind it it turns the world color (white), despite that my film is set to Transparent and I dont render the background color:



What can I do to make glass ACTUALLY transparent?

In recent 2.79:
Under Render>Film you can check 'Transparent' and afterwards 'Transparent Glass'. It may be possible that you are using a blender version, which doesn't have this option. If you aren't bound to any particular version I suggest downloading a Daily Build from https://builder.blender.org/download/

I tried with MixShader (Transparend BSDF and Glass BSDF) and just Glass BDSF, both of them work for me.

The cubes are actually transparent, but it of course then must take some background here in the stackexchange.

Edit, because question was edited:


Enable 'Transparent'
Enable 'Transparent Glass'
Disable 'Transparent'


This way 'Transparent Glass' is enabled without making the background transparent (Imgur has problems with BSE so direct link: https://imgur.com/a/2TSKsfe)