Recover small angles from quaternions and vectors - #379
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Use arctan2 instead of arccos to extract the rotation angle in * axis_angle_from_quaternion * axis_angles_from_quaternions * axis_angle_from_two_directions * angles_between_vectors, 3D case arccos rounds angles below about 1e-8 to exactly 0 and loses relative precision well above that. Same fix as for axis_angle_from_matrix and axis_angles_from_matrices, see #377.
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Use arctan2 instead of arccos to extract the rotation angle in
arccos rounds angles below about 1e-8 to exactly 0 and loses relative precision well above that. Same fix as for axis_angle_from_matrix and axis_angles_from_matrices, see #377.