-4 2 setxrange
-2 3 setyrange
25 setxunit
3 10 6 SetCamPos
0 0 0 SetCamView
qplanxy
2 setlinejoin 
6 setresolution
newpath
   pi 0 smoveto
   pi 0 {Sin 2 mul} Courbe_
currentcpathpointstable -2 rollparray
0 2 newprismedroit
dup drawsolid
dup solidshowsommets
solidnumsommets