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.

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