cube.py

# -*- coding: utf-8 -*-

"""
Cube model.

Copyright (c) 2010, Renaud Blanch <rndblnch at gmail dot com>
Licence: GPLv3 or higher <http://www.gnu.org/licenses/gpl.html>
"""

# imports ####################################################################

from linalg import vector as _v

# model ######################################################################

bbox = [-1., 1.]
points = [(x, y, z) for x in bbox for y in bbox for z in bbox]

faces = [
    [0, 1, 2, 3],
    [1, 5, 3, 7],
    [5, 4, 7, 6],
    [4, 0, 6, 2],
    [2, 3, 6, 7],
    [4, 5, 0, 1],
]


def rgb(x, y, z):
    return x / 2 + .5, y / 2 + .5, z / 2 + .5


sizes = []
verticies, normals, colors = [], [], []

for indexes in faces:
    sizes.append(len(indexes))
    p0, p1, p2 = [points[indexes[i]] for i in range(3)]
    normal = _v.cross(_v.vector(p0, p1), _v.vector(p0, p2))
    for index in indexes:
        vertex = points[index]
        verticies.append(vertex)
        normals.append(normal)
        colors.append(rgb(*vertex))

tex_coords = verticies
indicies = list(range(sum(sizes)))

__all__ = [
    "sizes",
    "indicies",
    "verticies",
    "tex_coords",
    "normals",
    "colors",
]