> prism { linear_sweep 0, 1, 11,
>   <P1.x, P1.y>, <IP1.x, IP1.y>,
>   <P2.x, P2.y>, <IP2.x, IP2.y>,
>   <P3.x, P3.y>, <IP3.x, IP3.y>,
>   <P4.x, P4.y>, <IP4.x, IP4.y>,
>   <P5.x, P5.y>, <IP5.x, IP5.y>,
>   <P1.x, P1.y>

  You only need the first 10 points. That last point is obsolete.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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