The definition of "Hip Rafter" includes beams (0/12 pitch).
The Deck angles are measured beginning at the x-axis to the Hip AB run, and between each successive pair of Hip runs. The plan may be rotated to place the first Hip rafter on the x-axis, setting the first Deck angle at zero.
A compound joint is possible only if all R1 with respect to the inclined deck are equal.
Four-Branch Compound Joint Calculator
Entry values measured with respect to Actual Deck
Returned values measured with respect to Inclined Deck