Post process override material on surface

Hi is there any way to change the materials on actor using a post process material?

what do you mean exactly?
a post process mat is a material. what do you want to do ?

So when the post process material is activated i want all materials the player is looking at to be a different texture. for example.

This

To this

But with a post process material. is this possible?

Hello,

It seems too high level for a post process, you could see a post process like a shader (in ShaderToy). Or maybe with UE4.22 there is a solution.

Good luck.