# Name

common_line_in3D - locate a common line between projections. The latter are denoted by the rotations RA and RB, where RA is (phiA,thetaA,psiA) etc.

Formula is (RB

^{T}zhat) cross (RA^{T}zhat) Returns phi, theta of the common line in degrees.

# Usage

- phiC, thetaC = common_line_in3D(phiA,thetaA,phiB,thetaB)

## Input

- phiA, thetaA
- first two Eulers of the rotation describing the first projection.
- phiB, thetaB
- first two Eulers of the rotation describing the second projection.

## Output

- phiC, thetaC = the spherical coordinates of the common line

# Author / Maintainer

P. R. Baldwin

# Keywords

- category 1
- UTILITIES
- category 2
- SPATIAL

# Files

utilities.py,

# Maturity

- stable
- works for most people, has been tested.

# Bugs

N one detected so far.