Hi there! New to the forum and fairly new to Unreal, this is my first time working with a shader for a personal project I am working on, I followed these two tutorials to get a stylized lineart effect.
Everything works pretty great, besides the landscape I made in engine. (see photo 1) I can only upload one photo as a new user so I have to condense them into one 
This happens if there is any sort of slope in the terrain, so if it’s not completely flat the geo shows up. I tried using a custom stencil to tell the material to not apply itself to landscape and only to the objects, which fixes the terrain, but anything that isn’t above a mesh with the same shader applied or visible, it will not receive the shader, an example of this below (photo 2).
My next try was to create a landscape similar to what is in unreal in maya, and the geo still appears if the object isn’t completely flat (see photo 3).
I’m at a loss as to why some of my meshes seem to be fine, but anything that I’m not trying to import now isn’t working. I’m starting to believe this isn’t an issue with the shader material and instead something with my meshes, or how the two are interacting with each other, I’m not sure, again I’m completely new to a post-processing effect like this, but I am at my wit’s end
I appreciate any help I can get, and I can share more info if need be!