Bounding box

A bounding box is a box aligned with the X, Y and Z axes that encloses a geometric shape.

shape.bbox

Build a bounding box for a shape.

Example:

shp = sphere(10)
bbox = shp.bbox()

Fields

bbox.xmin
bbox.ymin
bbox.zmin
bbox.xmax
bbox.ymax
bbox.zmax

Methods

bbox.xrange(), bbox.yrange() and bbox.zrange() return coordinate ranges.

Creating a box shape

Example:

shp = sphere(10)
bbox = shp.bbox()
disp(bbox.shape())

Dimensions and coordinates

shape.boundbox() and shape.bbox() return an axis-aligned BoundaryBox. Coordinates are Scalar values; minimum, maximum and center are Point3; size is Vector3.

import zencad as z

bounds = z.box(2, 3, 4).bbox()
assert all(abs(a - b) < 1e-5 for a, b in zip(bounds.size.value(), (2, 3, 4)))
record = bounds.value()
print(record.minimum, record.maximum)

xmin, xmax, ymin, ymax, zmin and zmax are properties; xlength(), ylength() and zlength() are methods. .value() returns numerical bounds; .native() returns an OCP Bnd_Box. OCCT tolerances may slightly enlarge the bounds, so compare dimensions with a tolerance. Empty geometry needs separate handling; do not assume it has a zero-sized box.