Virtual extraction data simulated by sampling random mechanical work and appying them independantly of angle and direction to produce a distance. angle : slope angle in degree (the nest being the lower end, and the foraging area being the upper end) init_pos : initial position of the obstacle in this replicate in meters from the nest replicate : number of the replicate end_pos : orientation of the extraction : to the upper-side (1) or the the lowerside (-1) nbSteps : number of pulls until extraction