How to change surface velocity direction?

jegea

Hi all,
I would like to change the direction of the velocity surface during the simulation. I know you can start or stop the surface movement with the physics control block, but I can't change to move it forward and backward. 

Is it possible? Can anybody help me?

Regards

MartinB

You can change the surface velocity of the physics control block. Eg forward +100 mm/s, backwards -100 mm/s. You could use a random number generator with tight min/max: min 99,99 max 100. Will be rounded to nearest INT.