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# 3D Matrices

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Yep, if you know the amount necessary to be translated, then you can just add to each x,y, and z coordinate. However, if you want to start concatenating matrices and saving them for later (instead of re-multiplying every game frame), you''ll probably want to store your translations in a matrix.

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Yes, you could just add these values to translate your point. But the real reasons for matrices is to make things SIMPLE, not more complex.

How can you describe the position of the last joint of the fourth finger of a villain''s left hand as he chases you across the top of a freight train? The only reasonable way is with matrices.

As I tried to point out above, with matrices, we need only think about that last joint of the fourth finger in terms of where it is relative to its parent, which would be the second to last joint of the fourth finger of the left hand of that hypothetical villain.