I have 2 polygons, they're 200 units apart and they're identical apart from 1
vertex being moved 1 unit.  They're displayed with different colours.  Why?  I'm
using version 3.7.0.msvc10-sse2.win32.

#version 3.5;
#include "colors.inc"
global_settings { assumed_gamma 1.0 }
background { rgb 0.0500 }
light_source { <0, +10000, 0> rgb 1 }
#declare Pigment1 = texture { pigment { color rgb < 1 , 0 , 0 > } }
#declare Pigment2 = texture { pigment { color rgb < 0 , 1 , 0 > } }
polygon
{
    11,
    < 192 , 0 , -126 >
    < 152 , 0 ,   23 >
    < 145 , 0 ,   53 >
    < 124 , 0 ,   77 >
    <  96 , 0 ,   88 >
    <  65 , 0 ,   84 >
    <  50 , 0 ,   79 >
    <  50 , 0 ,  126 >
    < 200 , 0 ,  126 >
    < 200 , 0 , -126 >
    < 192 , 0 , -126 >
    texture { Pigment1 } interior_texture { Pigment2 }
}
polygon
{
    11,
    < 392 , 0 , -126 >
    < 353 , 0 ,   23 >
    < 345 , 0 ,   53 >
    < 324 , 0 ,   77 >
    < 296 , 0 ,   88 >
    < 265 , 0 ,   84 >
    < 250 , 0 ,   79 >
    < 250 , 0 ,  126 >
    < 400 , 0 ,  126 >
    < 400 , 0 , -126 >
    < 392 , 0 , -126 >
    texture { Pigment1 } interior_texture { Pigment2 }
}
plane
{
    y, -0.1
    pigment
    {
        checker rgbf <0.6,0.6,0.6, 1.0>, rgbf <1,1,1, 0.6>
    }
    scale 100
}
camera
{
    location < 200 , 8000 , 0 >
    right 1.778 * x
    angle 6.5000
    look_at < 200 , 0 , 0 >
}

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