Hello all.  This is my first post.  Hope I'm following protocol.

Below is code I wrote for the difference between a helix isosurface and a
box.  As you can see the box is removing the section of helix but leaving
an artifact.  Can anyone explain how to fix this?  Thanks in advance.






#include "colors.inc"
#include "functions.inc"

global_settings {
        assumed_gamma 1.3
        max_trace_level 5}


camera { location <3,3,-4>
         look_at <1,0,0>}


light_source {<10, 20, -30> color Gray25}


sky_sphere {pigment {gradient y color_map {[0, 1  color Gray50 color
Gray80]}}}


plane { y, -1.25 pigment {checker color Gray40 color Gray80 scale <1, 1,
10000> rotate y*45} finish { ambient 0.45 }}


#declare IsoTexture = texture { pigment { rgb <1.0, 0.8, 0.5> } finish {
phong 0.6 phong_size 250 } }


#declare spring =
         isosurface {
                        function { f_helix1(x,y,z, 1, 20, 0.0875, 0.75, 1,
1, 0) }
                  contained_by { box { <-1, -2.2, -1>, <2, 2, 2> } }
                  max_gradient 5
                  texture { IsoTexture }
                  no_shadow
                  scale <1,1,-1>
                  rotate <0,0,90>
                         }


#declare cutaway =
        box { <-10,0,0> <20,100,-100> pigment {White}
          }


difference{
        object{spring}
        object{cutaway}
        }

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