Python - Groups - hexagon, cylinders and spheres

The Ray Tracer Challenge:
A Test-Driven Guide to Your First 3D Renderer
楽天 紀伊国屋書店

開発環境

• macOS Mojave - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Python 3.7 (プログラミング言語)
• GIMP (ビットマップ画像編集・加工ソフトウェア、PPM形式(portable pixmap)の画像用)

The Ray Tracer Challenge: A Test-Driven Guide to Your First 3D Renderer (Jamis Buck(著)、Pragmatic Bookshelf)、Chapter 14(Groups)のPutting It Together(203)を取り組んでみる。

コード

Python 3

#!/usr/bin/env python3
import math
import time
from camera import Camera
from tuples import Point, Vector, Color
from spheres import Sphere
from cylinders import Cylinder
from groups import Group
from transformations import translation, scaling, view_transform
from transformations import rotation_y, rotation_z
from lights import Light
from world import World

width = 250
height = 125

camera = Camera(width, height, math.pi / 4,
                transform=view_transform(Point(0, 2, -5), Point(0, 0, 0),
                                         Vector(0, 1, 0)))


def hexagon_side(transform=None):
    side = Group(transform=transform)
    for shape in [Sphere(transform=translation(0, 0, -1) *
                         scaling(0.25, 0.25, 0.25)),
                  Cylinder(minimum=0, maximum=1,
                           transform=translation(0, 0, -1) *
                           rotation_y(-math.pi / 6) *
                           rotation_z(-math.pi / 2) *
                           scaling(0.25, 1, 0.25))]:
        side.add_child(shape)
    return side


def hexagon():
    hex = Group()
    for n in range(6):
        side = hexagon_side(rotation_y(n * math.pi / 3))
        hex.add_child(side)
    return hex


world = World([hexagon()],
              Light(Point(-5, 5, -5), Color(1, 1, 1)))
start = time.time()
canvas = camera.render(world)
s = time.time() - start
with open(f'sample5.ppm', 'w') as f:
    canvas.to_ppm(f)
print(f'ファイル名 sample5.ppm,{s}秒')

入出力結果(Bash、cmd.exe(コマンドプロンプト)、Terminal、Jupyter(IPython))

C:\Users\...>py sample5.py
ファイル名 sample5.ppm,479.89529490470886秒

C:\Users\...>