[Member 4148]

Originally posted by narf poit chez BOOM:
x is left/right, y is up/down, z is not used.

it's a random straight line x movement and i need the y position on the sphere that a line straight up would hit.

sorry for not being clear the first time. i guess i need to reread mathamatical Posts at least three times.

Oh. That's easier -
need: r: radius of sphere
d: distance traveled
want: h: height above bottom edge of sphere

edit: small mistake on co-ordinate system - fixed
h = r - sqrt(r - d^2)

notes:
not defined for |d| > r
above applies for lower edge
upper edge is h = r + sqrt(r - d^2)

[ February 19, 2004, 08:08: Message edited by: Member 4148 ]