> > [using a matrix transformation instead of center/radius]
> It would be much slower.
For a sphere, I understand this, but for an ellipsoid? The ray has to be
multiplied with a matrix anyway, the center/radius scale/translate matrix
could be combined with the matrix that's already there (that made an
ellipsoid out of the sphere). Wouldn't that save a vector-subtraction (no
big time saving, but not slower at least)

> IIRC it is done similiar way, but I can be wrong
What's IIRC?

> Buy RAM ? :-)
Guess I'll gonna do that...
But admit it: when you read my problem first, you also thought: 500,000
spheres - no problem with 256MB.

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