How can I use two camera captures in a single post-process shader?

You can try something like this:

You would need to use an If node instead of Lerp for that kind of transition effect though i think.

First time posting though I think this is the proper section for this question but bear with me otherwise.

A bit more information:

I created a simple fragment shader (Error - Shadertoy BETA) that does a transition between two textures/channels for a first person teleportation effect.

Can Unreal take a screen capture from two camera actors and pipeline it to a post-process material or an actual HLSL shader to render on the players screen? Initially, I wanted to swap between only two cameras but a third (in which it would be the player actor) may be required.

I know in OpenGL it would take a single pass and two shaders, One to get the textureBuffer (twice as there are two camera’s) and One to do the effect but I don’t think Unreal opens that accessibility.