x and z as a function of t:
x = 40 cos t
z = 20 sin t

arc length is the integral (sum) of distance formula (pythagorean theorem):
 /b   ___________________________
 |  \/(40 cos t)^2 + (20 sin t)^2 dt
 /a

find arc length of the total ellipse and divide by however many sections you want,
find where those arc
lengths are

this can only be done numerically. :( so Jan Cristoph & Francois are correct.

--
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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