(15
(Choose 1 answer)
In which situation, the perspective of the inclined picture plane is used?
A. When the observer looks straight out, the axis of the cone of vision is parallel to the ground
B. When the observer looks up or look straight out, the axis of the cone of vision looks upwards.
C. When the observer looks down or look straight out, the axis of the cone of vision looks downwards
D. Both cases when the observer looks up or down, the axis of the cone of vision looks upwards or downwards.
