On 29/01/14 10:30, John Greenwood wrote:
> I have created an isosurface with _exactly_ the shape I want, but there is one
> region where generation breaks down, I think because of surfaces coinciding.
> 
> Any suggestions?
> 
> // This works except fo the "Ears" where the parabola reflects
>     function {-((1-pow(z/Zo,2))*pow((y-Rr+sqrt(pow(Rr,2)-pow(z,2))),2))+pow(x,4)}
>     max_gradient 200
>     accuracy     0.001
>     threshold 0
>     contained_by {box {<0,0,-1>,<2,2,1>}}
>            }

You need the keyword 'all_intersections' thus:
function
{-((1-pow(z/Zo,2))*pow((y-Rr+sqrt(pow(Rr,2)-pow(z,2))),2))+pow(x,4)}
    max_gradient 32
    accuracy     0.001
    threshold 0
    all_intersections
    contained_by {box {<0,0,-1>,<2,2,1>}}
           }
You will also notice that I have reduced your max_gradient to 32 thus
gaining an ~40% increase in speed.

See: http://www.povray.org/documentation/view/3.7.0/300/ At the bottom
of the page there is a short paragraph about max_trace and
all_intersections.

John
-- 
Protect the Earth
It was not given to you by your parents
You hold it in trust for your children

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