truncated cone plot

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Lorenzo
Lorenzo 2012-5-22
Hi everybody, I'm just trying to plot and save a 3D matrix of points that describes a truncated cone. I've realized it with a set of concentric circles (or, better to say, one-period-spirals) reducing the external size from floor to floor. May i ask you if you know how to realize a truncated cone (just the surface) with only one spiral growing from the base to the top? Thanks for your time

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the cyclist
the cyclist 2012-5-22
It is not perfectly clear to me what you want, but here is a parameterization that sounds close to what I think you mean:
t = 30:0.1:100;
az = 0.1;
z = az*t;
r0 = 10000;
ar = -1;
r = r0 + r0*t;
at = 0.05;
theta = at*t;
x = r .* cos(t);
y = r .* sin(t);
figure
plot3(x,y,z,'.-')

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