In classic oblique projections two coordinate axes are not changed by the mapping and a shearing is applied to the third.
The projection direction of the third axis is given by two angles α and Φ
The angle Φ is preserved in the projection and corresponds to the angle between the projected y- and x-axis. The angle α controls the ratio:
Cavalier projection x:y=1:1
Cabinet projection: x:y=2:1
Central projection CAM-position
