def _normalise(input_vector: QVector3D) -> Tuple[QVector3D, float]:
"""
Normalise to unit vector
:param input_vector: Input vector
:return: Unit vector, magnitude
"""
magnitude = input_vector.length()
if magnitude == 0:
return QVector3D(0.0, 0.0, 0.0), 0.0
return input_vector.normalized(), magnitude
def calculate_vertices(axis_direction: QVector3D, height: float,
radius: float) -> np.ndarray:
"""
Given cylinder axis, height and radius, calculate the base centre, base edge and top centre vertices
:param axis_direction: axis of the cylinder (not required to be unit vector)
:param height: height of the cylinder
:param radius: radius of the cylinder
:return: base centre, base edge and top centre vertices as a numpy array
"""
axis_direction = axis_direction.normalized()
top_centre = axis_direction * height / 2.0
base_centre = axis_direction * height / -2.0
radial_direction = get_an_orthogonal_unit_vector(
axis_direction).normalized()
base_edge = base_centre + (radius * radial_direction)
vertices = np.vstack((
qvector3d_to_numpy_array(base_centre),
qvector3d_to_numpy_array(base_edge),
qvector3d_to_numpy_array(top_centre),
))
return vertices
