Pascal,
For my implementation, look at p129 in the first link for conversion from (x,y) to (x,y,z).
Note, the (corrected) script from my notes are available
http://webbox.lafayette.edu/~reiterc/j/vector/factor_ecj.html
but using x. y. era notation and lots of x y local variable so updating to modern J will require attention. I will be interested in updating this to modern J. Perhaps a project for next week. It has been 10 years since I last thought about this so I'm a bit rusty.
 Best, Cliff
On 1/30/2014 10:41 PM, Pascal Jasmin wrote:
Hi Cliff,
I don't understand how to go from xyz back to xy coordinates.

...


http://archive.vector.org.uk/art10007270
http://archive.vector.org.uk/art10007280


--
Clifford A. Reiter
Lafayette College, Easton, PA 18042
http://webbox.lafayette.edu/~reiterc/

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