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Planar reflections are great for planar surfaces, but it’s very demanding on the GPU and doesn’t work for all kinds of reflections. One solution would be to use a linked copy of the video billboard that uses a masked material right “behind” the translucent material. To keep the soft edges on the translucent material, the masked material would need to use an eroded alpha matte. Erode in UE4 is already available in Composure, so that can probably be used for this as well.