What's wrong with this code?

        prism {
        #local v3 = vrotate(<0, 2.91>, y*3.5);
        #local v4 = vrotate(<0, 3.03>, y*3.5);
        linear_sweep
        linear_spline
        0,
        0.6,
        4,
        <0, 2.91>, <0, 3.03>, <v4.x, v4.z>, <v3.x, v3.z> pigment { Green
}
        }

It should get me a quadrilateral which is somewhat keystone-shaped.  I'm
getting nothing, but it the rendering slows down perceptibly at the spot
where I should see something.  (I had had a torus passing through the
middle of it (its major radius 2.97), which I left out here.  Also left
out camera & lighting for expediency.

Thanks!
Mark

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>         #local v3 = vrotate(<0, 2.91>, y*3.5);
>         #local v4 = vrotate(<0, 3.03>, y*3.5);


This is the same as

>         #local v3 = vrotate(<0, 2.91,0>, y*3.5);
>         #local v4 = vrotate(<0, 3.03,0>, y*3.5);

and both the X and Z of the resulting vectors are zero.

what you meant to do was

>         #local v3 = vrotate(<0, 0, 2.91>, y*3.5);
>         #local v4 = vrotate(<0, 0, 3.03>, y*3.5);

 - Slime
[ http://www.slimeland.com/ ]

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Slime wrote:
> 
> >         #local v3 = vrotate(<0, 2.91>, y*3.5);
> >         #local v4 = vrotate(<0, 3.03>, y*3.5);
> 
> This is the same as
> 
> >         #local v3 = vrotate(<0, 2.91,0>, y*3.5);
> >         #local v4 = vrotate(<0, 3.03,0>, y*3.5);
> 
> and both the X and Z of the resulting vectors are zero.
> 
> what you meant to do was
> 
> >         #local v3 = vrotate(<0, 0, 2.91>, y*3.5);
> >         #local v4 = vrotate(<0, 0, 3.03>, y*3.5);
> 
>  - Slime
> [ http://www.slimeland.com/ ]



--Mark

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