Let B be the bend angle (30deg)
Let R be the rotation angle
Let Ha be the apparent horizontal angle (viewed from above)
Let Va be the apparent vertical angle (viewed from the side)
tanHa =tanB*cosR
tanVa =tanB*sinR
20 deg rotation:
tanHa =tan30*cos20=0.577*0.9397=0.536 (Ha=28.19deg)
tanVa...