I'm trying to draw a box, where the bottom half of the side of the box facing
the light source is cut away, allowing the light to enter the box. I've tried
using clipped_by and difference, and a few other things, but nothing is really
working. Probably because I have no idea what I'm doing. Can someone provide
some guidance?

Thanks in advance.

Rhonda


Here's the current, non-working version of my code:

background { color Blue }
camera {
    location <0, 10, -50>
    look_at  <0, 0,  20>
}

box {
    < -10,  0,  0>,   // left corner
    <10, 20,   20>  // right corner
   hollow
    texture {
      Aluminum
 pigment { color Green }
    }
 interior
 { ior 1.5
 }
      finish {
       reflection {
   0.9, 1.0
   fresnel on
   metallic on
  }
     }
     clipped_by { box {
       <-9,1,0>,<9,10,1 >
     }
     }
rotate y*20

}

light_source { <5, 20, -30>
 color White
 }

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