This demonstrates how to calculate the distance between points or object positions.

                                    ` This code was downloaded from The Game Creators
                                    ` It is reproduced here with full permission
                                    ` http://www.thegamecreators.com
                                    
                                    ObjectPosX# = object position x( obj_num )
ObjectPosY# = object position y( obj_num )
ObjectPosZ# = object position z( obj_num )

Object2PosX# = object position x( obj2_num )
Object2PosY# = object position y( obj2_num )
Object2PosZ# = object position z( obj2_num )

X# = ObjectPosX# - Object2PosX#
Y# = ObjectPosY# - Object2PosY#
Z# = ObjectPosZ# - Object2PosZ#

Distance# = sqrt( (X# ^ 2) + (Y# ^ 2) + (Z# ^ 2 ) )