object spherical

Once you have opened a Maxima session, load package **draw** and then set global variable **draw_renderer** to **vtk**:

load("draw") $ draw_renderer: 'vtk $

To read the documentation on object **spherical**, write the following sentence:

describe(spherical) $

A nautilus defined in **spherical** coordinates. The first argument to object spherical is the radius, as a function of the zenith and azimuth angles:

draw3d( color = white, spherical(a+z,a,0,3*%pi,z,0,%pi) ) $

Another example in spherical coordinates:

draw3d( axis_3d = false, color = salmon, background_color = cyan, xu_grid = 100, yv_grid = 100, color = white, spherical(sin(z)*cos(2*a),a,0,2*%pi,z,0,%pi))$

Isolines on a **spherical** surface:

draw3d( enhanced3d = a-z, isolines = [x,x,y,z], axis_3d = false, line_width = 2, spherical(a+z,a,0,3*%pi,z,0,%pi))$

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