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Window transparency rendering problem

I want to make a transparent window with opaque objects inside and this is as far as I got. Problem is that is not fully transparent and there is a problem with lighting. There is a cube with a light source in front. On the right, I set the background color alpha to 0. When I move around it acts like drawing with a white brush. Any help, please ? alt text

Product Version: UE 4.19
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asked Oct 09 '18 at 08:57 PM in C++ Programming

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