Delete ABM, add global timer, and adjust gravity

init.lua

@@ -1,28 +1,34 @@
-local func = function()
+--[[
+
+Lowers gravity the higher (and lower) you get above (or below) sea
+level, max gravity at sea level.
+
+]]--
+
+
+local update = function()
+	for _, players in ipairs(minetest.get_connected_players()) do
 	    local player = minetest.get_player_by_name("singleplayer")
 	    local pos = player:get_pos()
 	    local grav = 1
-    if pos.y > 10 then grav = 10/pos.y end
+	    if pos.y > 300 then grav = 300/pos.y end
+	    if pos.y < -300 then grav = -300/pos.y end
 	    player:set_physics_override({gravity=grav})
-
+	end
 end
 
-minetest.register_abm({
-	nodenames = {
-		"air",
-		"default:stone",
-		"default:dirt",
-		"default:sand",
-		"default:water_source"
-	},
-	neighbors = {
-		"air",
-		"default:stone",
-		"default:dirt",
-		"default:sand",
-		"default:water_source"
-	},
-	interval = 1,
-	chance = 1,
-	action = func
-})
+local gravity_timer = 0
+local action_timer = 0
+
+local function gravity_globaltimer(dtime)
+	gravity_timer = gravity_timer + dtime
+	action_timer = action_timer + dtime
+
+	if action_timer > 4 then
+		update()
+		action_timer = 0
+	end
+end
+
+minetest.register_globalstep(gravity_globaltimer)
+