On 05/08/2016 03:33 PM, Le_Forgeron wrote:
> For the time being, only available in hgpovray.
>
> lemon { P1, R1, P2, R2, R3 ... }
>
> similar to cone { P1, R1, P2, R2 ...} but connected with a lemon (inner circle of a
torus) of radius R3.
>
> Options includes : uv_mapping, open and sturm.
>
> All Rx must be positive or null, and there is a complain with error when R3 is too
small.
> The complain gives the minimal value that can be used.
>
> And now that I can sleep a bit, I'm returning to the extension of the ovus.
>

In working with this new object I came across this case:

// P1, R1, P2, R2, R3
#declare LemonLeft  = lemon {
    <-1.2,-0.5,0>, 0.0, <-1.2,0.5,0>, 0.0, 0.499999
}
#declare LemonCenter = lemon {
    <0,-0.5,0>, 0.0, <0,0.5,0>, 0.0, 0.50
}
#declare LemonRight  = lemon {
    <1.2,-0.5,0>, 0.0, <1.2,0.5,0>, 0.0, 0.500001
}

Where the LemonLeft generates this warning message:

File 'lemon.pov' line 176: Possible Parse Error: Inner (last) radius of 
lemon is too small. Minimal would be 0.5. Subtituing a sphere to lemon

recommending the code used in LemonCenter. However the result for 
LemonCenter is quite noisy. An 'epsilon' above is OK.

See attached image.

Bill P.

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