Glass Reflections on Background

[liquidstudio]

Hi,

I have a problem with glass reflections in windows. I would like to render an interior using strong, white light from outside ( world backgrount set as white ). Everything seems to work fine exept reflections - they are not independent from background! In cycles I could set transparent background while preserving reflections and then, after rendering was done, i could use any bitmap in Photoshop as my background keeping reflections intact.
Here are some examples:

Here is an entire rendering with swapped background:

As you can see there are no reflections in windows at all.

Reflection and Refraction is affecting All Channels in the material settings.
I use Linear Workflow and save files as EXR.

Does anyone know the solution for this problem? I can't do my work without this issue being fixed

Best Regards,
Marcin Mirkowicz.

[JuhaW]

More refract IOR to glass and if you take reflection pass you can see are reflections there or not, it they are then your world background power burn your reflections to white so you cant see them.

[liquidstudio]

Thank you for a reply. I have managed to use render channels. Reflections are there and they are as they should be - strong. I can composite them now in postproduction quite easily. I see the main problem is that reflections in combined pass are baked into background. I think it is not a good solution. Especially if you want to save a transparent png. The second bug i've noticed is the glass material and color mapping. Lets say i want to use a proper bitmap background, but i want to leave it as it was made in Photoshop. The "Affect Background" in color mapping is checked off. I hit render, and... Its gamma corrected, tone mapped etc. ( interior rendering ). When i move the camera outside - the background is ok. So the glass material is causing all the problems. I can't figure out how to disable color mapping for a single material or how to force refraction to not affect my background.