fristCamInverse is Tc1m, from tag to fram 1 of cam; eigenCam: Tmc2, from frame 2 of cam to tag; then get Tc1c2; from c2 to c1;
However, firstEEInverse is Tbe1 from ee_fixed_link to base_link; eigenEE; Te2b, from base_link to e2;
What is get Tbe1 * Te2b???