Back to draw-Gnuplot
Once you have opened a Maxima session, load package draw:
To read the documentation on object spherical, write the following sentence:
Function defined in spherical coordinates. In this example, variable a is the azimuth and variable z is the zenith. The expression is for the radius:
draw3d( surface_hide = true, axis_3d = false, color = salmon, spherical(sin(z)*cos(2*a),a,0,2*%pi,z,0,%pi))$
A geometrical model for genus Nautilus:
draw3d( color = green, surface_hide = true, axis_3d = false, spherical(a+z,a,0,3*%pi,z,0,%pi))$
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