用 VPython 制作戒指
VPython可以轻松创建可导航的 3D 显示和动画，即使对于那些编程经验有限的人来说也是如此。因为它是基于Python的，所以它也为有经验的程序员和研究人员提供了很多东西。 VPython允许用户在 3D 空间中创建球体和圆锥体等对象，并将这些对象显示在窗口中。这使得创建简单的可视化变得容易，使程序员可以更多地关注他们程序的计算方面。 VPython的简单性使其成为说明简单物理的工具，尤其是在教育环境中。
安装 ：
pip install vpython环是三维空间中的几何对象，具有内部空心的圆形。我们可以使用ring()方法在VPython中生成一个环。
环（）方法
Syntax : ring(parameters)
Parameters :
- pos : It is the position of the center of the ring. Assign a vector containing 3 values, example pos = vector(0, 0, 0)
- axis : It is the axis of alignment of the ring. Assign a vector containing 3 values, example axis = vector(1, 2, 1)
- up : It is the orientation of the ring. Assign a vector containing 3 values, example up = vector(0, 1, 0)
- color : It is the color of the ring. Assign a vector containing 3 values, example color = vector(1, 1, 1) will give the color white
- opacity : It is the opacity of the ring. Assign a floating value in which 1 is the most opaque and 0 the least opaque, example opacity = 0.5
- shininess : It is the shininess of the ring. Assign a floating value in which 1 is the most shiny and 0 the least shiny, example shininess = 0.6
- emissive : It is the emissivity of the ring. Assign a boolean value in which True is emissive and False is not emissive, example emissivity = False
- texture : It is the texture of the ring. Assign the required texture from the textures class, example texture = textures.stucco
- radius : It is the radius of the ring. Assign a floating value, the default radius is 1, example radius = 5
- thickness : It is the radius of the cross section of the ring. Assign a floating value, the default thickness is 1/10 value of radius, example thickness = 8
- size : It is the size of the ring. Assign a vector containing 3 values representing the length, height and width respectively, example size = vector(1, 1, 1)
All the parameters are optional.
示例 1：没有参数的环，所有参数都将具有默认值。
# import the module
from vpython import * ring()
输出 ： 
示例 2：使用参数纹理、轴和向上的环。
# import the module
from vpython import * ring(texture = textures.wood,
axis = vector(0, 0, 1),
up = vector(1, 0, 0))
输出 ： 
示例 3：显示 2 个环以可视化属性 pos、radius 和厚度。
# import the module
from vpython import *
# the first ring
ring(pos = vector(-2, 2, 0),
axis = vector(0, 0, 1),
radius = 2,
thickness = 1,
color = vector(0.2, 0.7, 0))
# the second ring
ring(pos = vector(1, -1, 5),
axis = vector(0, 0, 1),
radius = 5,
color = vector(0, 0.2, 0.8))
输出 ： 
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