Keep transparency in material without Translucency?

[Arkiras]

@Suthriel

Here is an example of how it looks, left the rectangular plane, right the result with both mask and transparency. Notice the mountains and tree line replacement from the refraction.

This is perfectly achievable within UE4 but this would be a translucent material with a mask in it, not a “masked and translucent” material.

Not a graphics programmer so take this with a grain of salt, but my understanding is “masked” materials are essentially opaque in the visible areas and so nothing behind them is rendered, as a result you can’t change the opacity because there would be nothing to show.