EDIT: Got my answer, thanks!
Sorry for the vague question, I will try to be as detailed as possible.
I am currently programming a simple 3d tilemap where the Y value of the vector is something that can change. This typically affects the 6 surrounding triangles in the following manner: Quads
This however isn't "fully symmetrical", so that each corner is identical and either only "4" or all of the surrounding triangles would be used instead like: Desired effect
Now what I am wondering, is there any particular/ideal ways that games use to achieve the desired effect?
Thanks in advance.