elliptic paraboloid

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gochenid 101 Dec 30, 2005 at 18:16

i have an elliptic paraboloid equation z=0.5*(x*x+y*y). I generated a set of points (x,y,z). I can draw these points in 2D with the equations:

x=rho*cos(a)*sin(;)
y=rho*sin(a)*sin(B)
z=rho*sin(B)

a’=a+a0
b’=b+b0

x’=rho*cos(a’)*sin(b’)
y’=rho*sin(a’)*sin(b’)
z=rho*sin(b’).

by ploting (x’,z’).

i can do the horizontal rotation without any problem, but the vertical rotation is not working, anyone has any idea?

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Nils_Pipenbrinck 101 Dec 30, 2005 at 19:45

please define horizontal and vertical rotation. We’re in 3d, and it’s all about the point of view.

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CobraLionz 101 Jan 22, 2006 at 06:31

Sounds to me like you don’t have a clue about spherical coordinates. You know that SAT question about the length of the diagonal of a cube? If you can answer that this should be easy.

edit:
i’d be more specific but this sounds like homework

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Reedbeta 167 Jan 22, 2006 at 17:19

cobra, this thread is almost a month old…I think the OP is gone by now.