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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> else if(d3dg){Da=d3dg->refR1>0?d3dg->refR1:2*d3dg->refR2; 
> Db=d3dg->refR2>0?d3dg->refR2:d3dg->refR1;
>
> Apparently, the equations are not symmetric and the radius of the 
> virtual sphere will be 2*r "sometimes"...
> I suggest using 1*r in all cases, but this is the sort of thing that 
> will modify results (at least slightly) for everybody.
Oooops, no, it was just a typo, D=2*r anyway... Its fixed now.

*B*