test_rigid_transform_3D.py

#!/usr/bin/env python3

import numpy as np
from rigid_transform_3D import rigid_transform_3D

# Test with random data

# Random rotation and translation
R = np.random.rand(3,3)
t = np.random.rand(3,1)

# make R a proper rotation matrix, force orthonormal
U, S, Vt = np.linalg.svd(R)
R = U@Vt

# remove reflection
if np.linalg.det(R) < 0:
   Vt[2,:] *= -1
   R = U@Vt

# number of points
n = 10

A = np.random.rand(3, n)
B = R@A + t

# Recover R and t
ret_R, ret_t = rigid_transform_3D(A, B)

# Compare the recovered R and t with the original
B2 = (ret_R@A) + ret_t

# Find the root mean squared error
err = B2 - B
err = err * err
err = np.sum(err)
rmse = np.sqrt(err/n)

print("Points A")
print(A)
print("")

print("Points B")
print(B)
print("")

print("Ground truth rotation")
print(R)

print("Recovered rotation")
print(ret_R)
print("")

print("Ground truth translation")
print(t)

print("Recovered translation")
print(ret_t)
print("")

print("RMSE:", rmse)

if rmse < 1e-5:
    print("Everything looks good!")
else:
    print("Hmm something doesn't look right ...")