#edit
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Shader on terrain problem
What is the problem? What did you expect? The shader seems to be doing what it is supposed to do (output yellow color).
@Aerodactyl55 For some reasons the description of the problem got cut out, i updated it:
“The yellow is supposed to cover the whole ground, but it's covering only a part of it and it's moving with the camera.”
I don't think this related to the shader. Do you have some kind of frustum culling in place? If so, try disabling it. I think the gray parts come from your clear color (you can verify this by changing the clear color)
I dont know the difference between the two codes, and I doubt its just what you showed. I suggest checking your matrices and/or render states.
Edit: I still think that the problem is related to some kind of culling/visibility test.