Sfere 2

di

Nove sfere disposte a griglia, lo sfondo è di colore grigio

from vpython import *
 
canvas(background = vector(0.5, 0.5, 0.5)) 

R = 1.0
D = 2.0
 
sphere(color = color.black  , pos = vector(-D, +D, 0), radius = R)
sphere(color = color.blue   , pos = vector( 0, +D, 0), radius = R)
sphere(color = color.cyan   , pos = vector(+D, +D, 0), radius = R)
sphere(color = color.green  , pos = vector(-D,  0, 0), radius = R)
sphere(color = color.magenta, pos = vector( 0,  0, 0), radius = R)
sphere(color = color.orange , pos = vector(+D,  0, 0), radius = R)
sphere(color = color.red    , pos = vector(-D, -D, 0), radius = R)
sphere(color = color.white  , pos = vector( 0, -D, 0), radius = R)
sphere(color = color.yellow , pos = vector(+D, -D, 0), radius = R)

Più leggibile…

from vpython import *
 
canvas(background = vector(0.5,0.5, 0.5))
 
R      = 1.0
D      = 2.0
COLORI = (color.black  , color.blue. , color.cyan, color.green, 
          color.magenta, color.orange, color.red , color.white, color.yellow)
 
colore = 0
for r in (D, 0, -D):
    for c in (-D, 0, D):
        sphere(color = COLORI[colore], pos = vector(c, r, 0), radius = R)
        colore += 1

Nove sfere semitrasparenti, disposte a griglia con sovrapposizioni parziali

from vpython import *
 
canvas(background = vector(0.5,0.5, 0.5))
 
R      = 1.0
OP     = 0.5
D      = 1.5
COLORI = (color.black. , color.blue  , color.cyan, color.green, 
          color.magenta, color.orange, color.red , color.white, color.yellow)
 
colore = 0
for r in (D, 0, -D):
    for c in (-D, 0, D):
        sphere(color = COLORI[colore], opacity = OP, pos = vector(c, r, 0), radius = R)
        colore += 1