600 setwidth
400 setheight
-7 8 setxrange
-5 5 setyrange
%% la source d'eclairage
/src {3 3 7} def
/kp 8 def
/f {Sin exch Sin add} def
/vect_I {-.7 -.5} def
/vect_J {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 0 1 1 ] kp -7 7 2 copy surfz
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