I tried the fixed prism, but that doesn't work for me. The lathe works fine, but
with the prism, I only see nothing. Thats my code:

#version 3.7; // 3.7
global_settings{assumed_gamma 1.0}
#default{ finish{ ambient 0.2 diffuse 0.9 }}
#default{pigment{rgb <0.800, 0.800, 0.800>}}
//------------------------------------------
#include "colors.inc"
#include "textures.inc"

//------------------------------------------
// camera ----------------------------------
#declare CamUp = < 0, 0, 1>;
#declare CamRight = <1.33, 0, 0>;
#declare CamRotation = <-35.264390534, 1.9538003485e-05, 45.0000026303>;
#declare CamPosition = <17.0710754395, -7.07106590271, 17.0710659027>;
camera {
    location <0, 0, 0>
    direction < 0, 1, 0>
    up CamUp
    right CamRight
    rotate CamRotation
    translate CamPosition
    angle 57.82
}

// sun -------------------------------------
light_source { <17.0710754395, -7.07106590271, 17.0710659027> color rgb<0.5,
0.5, 0.5> }

// background ------------------------------
sky_sphere {
   pigment {
   gradient z
   color_map {
        [ 0.00  color rgb<0.098, 0.667, 0.067> ]
        [ 0.30  color rgb<0.098, 0.667, 0.067> ]
        [ 0.50  color rgb<0.576, 0.000, 0.000> ]
        [ 0.70  color rgb<0.200, 0.200, 0.396> ]
        [ 1.00  color rgb<0.200, 0.200, 0.396> ]
       }
   scale 2
   translate -1
   rotate<-35.264390534, 1.9538003485e-05, 45.0000026303>
   }
}


//------------------------------------------
// objects in scene ------------------------

prism {
      bezier_spline
      0,.2,8,
      <2.00, 1.00>, <1.00, 1.50>, <3.00, 3.50>, <2.00, 4.00>
      <2.00, 4.00>, <3.00, 4.50>, <1.00, 6.50>,<2.00, 7.00>
      pigment { color rgbt<0.4,0.2,1,.5>}
      finish { ambient 1 }
    }
/*
lathe {
      bezier_spline
      8
      <2.00, 1.00>, <1.00, 1.50>, <3.00, 3.50>, <2.00, 4.00>
      <2.00, 4.00>, <3.00, 4.50>, <1.00, 6.50>,<2.00, 7.00>
      pigment { color rgbt<0.4,0.2,1,.5>}
      finish { ambient 1 }
    }*/

Thanks in advance!

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