dz4.1

dz

Reports the z-increment (the amount by which the turtle's zcor would change) if the turtle were to take one step forward at its current heading and pitch.

NOTE: dz is simply the sine of the turtle's pitch. Both dx and dy have changed in this case. So, dx = cos(pitch) * sin(heading) and dy = cos(pitch) * cos(heading).

See also dx, dy.