vle-vector-isxaxis


(vle-vector-isxaxis  vec)

This function returns whether vec is equal to X-axis vector (1 0 0).

Arguments

vec  a 2d or 3d vector list

Return

T or NIL

Example

(setq vec '(1 1 0))
(vle-vector-isxaxis vec)
NIL

(setq vec '(1 0 0))
(vle-vector-isxaxis vec)
T

Remarks

the vec must be in 1-unit length (normalised)


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