Trying to make a voxel block, but triangles keeps making the triangle wrong!

Question

Hello I am so confused why it does this, I want it to make a plane yet it makes another triangle into another triangle, honestly MY HEAD IS GONNA EXPLODE!

here is a picture : https://pasteall.org/pic/97b4dee1bbb64d4982bee370c1116f24

in the code I am going 3,7,2 and then 2,7,6 that should make a flat plan yet it makes a messed up triangles.

here is the code if I did something wrong in the code please tell me!

code :https://pasteall.org/7Jr2

Answer 1

I used the wrong mesh type, I needed (Mesh.PRIMITIVETRIANGLES) and NOT Primitivetriangle_fan