I'm trying to make an arch using isosurface blocks and need a parallelogram
block.  Attached is the closest I've gotten, and here's the code to get
that:

#declare F2=function{pigment{
  agate
  turbulence 0.5
  color_map { [0 rgb 1] [.01 rgb 0][1 rgb 1] }
  scale 1
  translate x*3
  }
}

#declare my_brick=isosurface {
  function { f_rounded_box(x*(.5-y/6),y,z,0.03,0.7,0.7,0.7) +
F2(x,y,z).grey*0.01 }


        max_gradient 2
        contained_by{sphere {0,R*2.7}}
        pigment {rgb .9}
        scale .5
        //finish {phong 0.5 phong_size 10}
};


There's a slight curve to the sides, how can I get them straight?

Thanks!

Rob

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