lassoan

# Create a markups fiducial node and place 6 points then copy paste this code into 3D Slicer's Python console.
# Two circles will be created (one for each 3 points) and the axis will be computed by connecting their centers.
# The circles and the axis is updated as the fiducial point positions are adjusted.

def sphereFrom3Points(markupsNode, startPointIndex):
    """Compute center and radius of 3-point sphere from 3 fiducial points
    source: https://stackoverflow.com/questions/20314306/find-arc-circle-equation-given-three-points-in-space-3d
    """
    import numpy as np
    A = np.zeros(3)