Devide a Triangle

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Well... I'm about to give up on this.
I've tried to make my own code to update the normals,(using Shamblers suggestion of calculating the 4th normal) but now it seems as if the original triangle (simmulated by the 3 replacements) is too bright, too dark, or the shade dont fade correctly?
(by the way: none of the triangles share any vertices with each other)
I'm new to this "Normals" thing so perhaps I should prize myself lucky to get any picture at all.
Anyway...

[edit: removed some pics.]

result with my own code to update the normals.