1 ! (c)2009 Joe Groff bsd license
2 USING: kernel math math.vectors sequences ;
3 IN: math.vectors.homogeneous
5 : (homogeneous-xyz) ( h -- xyz )
8 : (homogeneous-w) ( h -- w )
12 2dup [ (homogeneous-w) ] bi@ over =
13 [ [ [ (homogeneous-xyz) ] bi@ v+ ] dip suffix ] [
15 [ [ (homogeneous-xyz) ] [ (homogeneous-w) ] bi* v*n ]
16 [ [ (homogeneous-w) ] [ (homogeneous-xyz) ] bi* n*v v+ ]
17 [ [ (homogeneous-w) ] [ (homogeneous-w) ] bi* * suffix ] 2tri
21 [ (homogeneous-xyz) n*v ] [ (homogeneous-w) suffix ] bi ;
36 [ (homogeneous-xyz) ] [ (homogeneous-w) ] bi v/n ;