Round each component of a vector to the nearest interger (i.e. make fractional part 0).

• v : Vector to snap.

This simply removes the fractional part of each axis of v - a form of "snap to grid".
Its purpose is to save network bandwidth by exploiting the fact that delta compression will only transmit the changes in state of a struct.
A changing vector will change less frequently if only the integral part is taken into account.

This function has no return value.

Timbo