Le 18/01/2013 21:26, clipka nous fit lire :
> Am 18.01.2013 20:48, schrieb clipka:
> 
>> It appears to me that the quadric solver goes berserk on the second
>> parabola whenever a ray is exactly parallel to the parabola's axis
> 
> Turns out that this is not /precisely/ true. Actually the problem occurs
> when the ray is /almost/ parallel to the parabola's axis (which happens
> because when reflected earlier at the other parabola there are ever so
> slight rounding errors). In such a case the algorithm gags on precision
> issues.
> 

would sturm help ?
(quadric does not seem to be documented to like sturm, but a change of
syntax for a poly ? hmm not sure)

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