Function spiral

recipes/Python/205451_Povray_for_python/recipe-205451.py:183–207

Fibonacci spiral

()

  file.write( cam, sphere, light )

def spiral():
  " Fibonacci spiral "
  gamma = (sqrt(5)-1)/2
  file = File()
  Camera(location=(0,0,-128), look_at=(0,0,0)).write(file)
  LightSource((100,100,-100), color=(1,1,1)).write(file)
  LightSource((150,150,-100), color=(0,0,0.3)).write(file)
  LightSource((-150,150,-100), color=(0,0.3,0)).write(file)
  LightSource((150,-150,-100), color=(0.3,0,0)).write(file)
  theta = 0.0
  for i in range(200):
    r = i * 0.5
    color = 1,1,1
    v = [ r*sin(theta), r*cos(theta), 0 ]
    Sphere( v, 0.7*sqrt(i),
      Texture(
        Finish(
          ambient = 0.0,
          diffuse = 0.0,
          reflection = 0.85,
          specular = 1
        ),
        Pigment(color=color))
    ).write(file)
    theta += gamma * 2 * pi