native entity_set_vector(iIndex, iKey, const Float:vNewVector);
Entry to write to
Array to copy to the entity
Sets a vector type value in an entities entvar struct.
For a list of valid vector type entries, see the EV_VEC_* constants in engine_const.inc
1 if value was sucessfully set, 0 if an invalid entry was specified
If an invalid entity index is provided, an error will be thrown.