ScreenPosition UV - shadow from alpha disappears

Hi everyone!

The problem I ran into is that as soon as i switch the UV coordinates to screenposition the shadow from the alpha of the video disappears.
Am I doing something wrong or it’s just not possible to get shadows with screenposition UVs?

Here is a video of the problem:

Thanks in advance!

Shadows are done by rendering object from light’s point of view, from which screen position no longer makes any sense.

Thanks for your reply!

Yeah… makes sense.

But can’t somehow convert the UV coordinates coming from the ScreenPosition node into “regular” UV coordinates? So that Unreal thinks it’s just a simple TexCoord?