I am making a pipe-fouling animation. I added a shifting(using Mix Shader node) material to the inner faces of the pipe, so it can switch between dirt shader and clean metal shader in animation.
My problem is if I crank up the displacement value of the dirt shader, the face will be lifted and leave a visible gap between the displaced surface and the original surface.
Is there any way I can fill the gap with dirt material using the Displacement node or displacement modifier? Or do you have any idea how I can achieve this effect?