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# 'draw'-Gnuplot interface:object spherical

Once you have opened a Maxima session, load package draw:

load("draw") $ To read the documentation on object spherical, write the following sentence: describe(spherical)$


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))$