| left-up-forward
Mathematically, 3D directional properties are the following:
1. Left-front-up
2. Left-front-down
3. Right-front-up
4. Right-front-down
5. Left-back-up
6. Left-back-down
7. Right-back-up
8. Right-back-down
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Time independence: [∂E(g)]²=[∂F(a)×∂r(a)]·[∂F(b)×∂r(b)] and Mass independence: ¶a(t)·¶r(t)=c²
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