function IsClient()
	return (Engine.Client ~= nil)
	end
	function IsServer()
	return (Engine.Server ~= nil)
	end
	function IsConnectedClient()
	local cl = Engine.Client
	if cl == nil then return false end
	return cl:IsTransceiverValid()
	end
	function detectGround(self)
	local phys = Engine.Game.Physics
	local physical = self.physical
	local transformable = self.transformable
	local _start = CreateTransform(transformable)
	local _end = CreateTransform(_start)
	local world = phys:GetWorld(0)
	self.onGround = false
	self.groundNormal = vec3f.new(0.0, 1.0, 0.0)
	local upVector = vec3f.new(0.0, 1.0, 0.0)
	local thisUnit = physical.Unit
	local overlaps = world:GetGhostOverlaps(thisUnit)
	local numOverlaps = overlaps:GetNumOverlappingUnits()
	local kGroundEpsilon = 0.05;
	local bestDot = -1.0;
	local bestNormal = CreateVector3f(upVector)
	for i = 0, (numOverlaps - 1) do --zero based
	local overlapUnit = overlaps:GetOverlappingUnit(i)
	if overlapUnit:GetType() ~= EUnitType.Rigid then
	local manifolds = overlaps:GetContactManifolds(overlapUnit)
	for i = 1, #manifolds do
	local manifold = manifolds[i]
	local ncontacts = manifold:GetNumContacts()
	for j = 1, #ncontacts do
	local contact = manifold:GetContact(j)
	if contact:GetDistance() < kGroundEpsilon then
	local n = CreateVector3f(contact:GetNormalWorldOnB())
	if manifold.UnitB == thisUnit then
	n = -n
	end
	local dot = n:dot(upVector)
	if dot > 0.6 and dot > bestDot then
	bestDot = dot
	bestNormal = n
	end
	end
	end
	end
	end
	end
	if bestDot > 0.6 then
	self.onGround = true
	self.groundNormal = bestNormal
	end
	end
	function player_init(self)
	if not IsConnectedClient() then
	end
	end
	function player_postinit(self)
	end
	function player_update(self)
	end
	local player_entity_table =
	{
	type = "player",
	root_type = "entity",
	init = player_init,
	postinit = player_postinit,
	update = player_update
	}
	local result = Engine:Register(player_entity_table)