600 setwidth
400 setheight
-7 8 setxrange
-5 5 setyrange
%% la source d'eclairage
/src {-3 -3 7} def
/kp 8 def
/f {
abs exch abs max
2 gt
{0}
{1}
ifelse
} def
/vect_J {.35 .35} def
/vect_I {1 0} def
/vect_K {0 1} def
%% syntaxe : nx ny (f) src_pt [color] kp x_min x_max y_min y_max surfz
150 150 (f) src [1 .65 0] kp -4 4 2 copy surfz
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