如何模擬左手定則？

Question

我使用結構來表示這樣的方向：鑑於B(Bx,By,Bz)和I(Ix,Iy,Iz)

struct POINT{ 
double x; 
double y; 
double z; 
} 

。如何確定F？

Answer 1

你的問題實際上是什麼算法爲vector cross-product。

POINT F; 
F.x = (B.y * I.z) - (B.z * I.y); 
F.y = (B.z * I.x) - (B.x * I.z); 
F.z = (B.x * I.y) - (B.y * I.x);