Have anyone else had any problems with quadratic spline?

The following code gives me what is going to be a chalice but when I
render the image everything gets 'striped'. The image seems to be
partially rendered.

Some of the problems disapear when I turn off the orthographic feature
of the camera.

I am using povray 3.1e compiled on a SGI O2 running IRIX 6.3

Any help would be appreciated.


Regards 

/Johan


#include "colors.inc"
#include "textures.inc"
#include "shapes.inc"

camera {
        location <0, 6.5, -30>
        look_at <0, 6.5, 0>
        orthographic
}

light_source {
        <20, 10, -100>
        color White
}

#declare chal =
lathe {
        quadratic_spline
        8,
        <14, 11>, <8.5, 8.5>,
        <6.5, 4.5>, <6, 0>, <5, -0.5>,
        <3.5, 0>, <2, 0>, <1, 0>
}

object {
        chal
        pigment { color White }
}

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