2차원에서의 평행투영변환

Overscript[X,^]^′ = <Overscript[n,^], Overscript[V,^] >Overscript[X,^] - Overscript[V,^] <Overscript[n,^], Overscript[X,^] >

Overscript[V,^] = (v_x, v_y, 0)

= ({{b v_y, -b v_x, -c v_x}, {-a v_y, a v_x, -c v_y}, {0, 0, a v_x + b v_y}}) · ({{x}, {y}, {1}})