Strange artefact on shader

Has anyone encountered this artefact before due to a shader I think it maybe of how data is handled or whether its too much:

Without knowing what you want to achieve and what you are doing (in the shader) it’s kind of hard to tell you what’s wrong in the first place. I am assuming you are talking about the noisy pattern on the blue model, but I can’t really see it on the pink model, so perhaps not?

So in short:

  • What are you not expecting?
  • What are you expecting?
  • What shader are you using? If needed, show code.