1 ! (c)2009 Joe Groff bsd license
2 USING: kernel math math.vectors sequences ;
3 IN: math.vectors.homogeneous
5 : (homogeneous-xyz) ( h -- xyz )
7 : (homogeneous-w) ( h -- w )
11 2dup [ (homogeneous-w) ] bi@ over =
12 [ [ [ (homogeneous-xyz) ] bi@ v+ ] dip suffix ] [
14 [ [ (homogeneous-xyz) ] [ (homogeneous-w) ] bi* v*n ]
15 [ [ (homogeneous-w) ] [ (homogeneous-xyz) ] bi* n*v v+ ]
16 [ [ (homogeneous-w) ] [ (homogeneous-w) ] bi* * suffix ] 2tri
20 [ (homogeneous-xyz) n*v ] [ (homogeneous-w) suffix ] bi ;
35 [ (homogeneous-xyz) ] [ (homogeneous-w) ] bi v/n ;