import numpy
import moderngl
from moderngl_window.opengl.vao import VAO
from moderngl_window.geometry import AttributeNames
[docs]def bbox(size=(1.0, 1.0, 1.0), name=None, attr_names=AttributeNames):
"""
Generates a bounding box with (0.0, 0.0, 0.0) as the center.
This is simply a box with ``LINE_STRIP`` as draw mode.
Keyword Args:
size (tuple): x, y, z size of the box
name (str): Optional name for the VAO
attr_names (AttributeNames): Attribute names
Returns:
A :py:class:`moderngl_window.opengl.vao.VAO` instance
"""
width, height, depth = size[0] / 2.0, size[1] / 2.0, size[2] / 2.0
pos = numpy.array([
width, -height, depth,
width, height, depth,
-width, -height, depth,
width, height, depth,
-width, height, depth,
-width, -height, depth,
width, -height, -depth,
width, height, -depth,
width, -height, depth,
width, height, -depth,
width, height, depth,
width, -height, depth,
width, -height, -depth,
width, -height, depth,
-width, -height, depth,
width, -height, -depth,
-width, -height, depth,
-width, -height, -depth,
-width, -height, depth,
-width, height, depth,
-width, height, -depth,
-width, -height, depth,
-width, height, -depth,
-width, -height, -depth,
width, height, -depth,
width, -height, -depth,
-width, -height, -depth,
width, height, -depth,
-width, -height, -depth,
-width, height, -depth,
width, height, -depth,
-width, height, -depth,
width, height, depth,
-width, height, -depth,
-width, height, depth,
width, height, depth,
], dtype=numpy.float32)
vao = VAO(name or "geometry:cube", mode=moderngl.LINE_STRIP)
vao.buffer(pos, '3f', [attr_names.POSITION])
return vao