Back to draw-VTK
Once you have opened a Maxima session, load package draw and then set global variable draw_renderer to vtk:
load("draw") $ draw_renderer: 'vtk $
The sphere object needs two arguments: center and radius:
draw3d( color = red, sphere([0,2,0],1), color = green, sphere([0,2,2],1), color = blue, sphere([0,2,4],1) ) $
Family of available 3d objects. We make use here of two global options: with axis_3d = false axes box is removed and with dimensions = [300,300] we fix the window dimensions:
draw3d( axis_3d = false, dimensions = [300,300], color = red, cone([0,0,0],1,1,[0,2,1]), color = blue, cylinder([0,0,2],1,1,[0,0,1]), color = dark_yellow, cube(1,1,1,[0,0,4]), color = light_gray, sphere([0,2,0],1))$
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