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How do you calculate the Normal vector to an Ellipse.

Radius Vector:

r=rx*i + ry*j + rz*k

Velocity Vector:

v=vx*i + vy*j + vz*k

at this point I would like to calculate the Normal to the ellipse.

That is as far as I been able to calculate.

Any help or suggestions are welcome.

Radius Vector:

r=rx*i + ry*j + rz*k

Velocity Vector:

v=vx*i + vy*j + vz*k

at this point I would like to calculate the Normal to the ellipse.

That is as far as I been able to calculate.

Any help or suggestions are welcome.

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