ScreenPosition UV - shadow from alpha disappears

Development Rendering
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1

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!

2

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

3

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?