Remove hardcoded gravity from item entity, fix bouancy in environmental effects

mods/ENTITIES/mcl_item_entity/init.lua

@@ -92,7 +92,6 @@ local function enable_physics(object, luaentity, ignore_check)
 		object:set_properties({
 			physical = true
 		})
-		object:set_acceleration(vector.new(0, -get_gravity(), 0))
 	end
 end
 
@@ -840,7 +839,6 @@ minetest.register_entity(":__builtin:item", {
 
 		self.object:set_armor_groups({ immortal = 1 })
 		-- self.object:set_velocity(vector.new(0, 2, 0))
-		self.object:set_acceleration(vector.new(0, -get_gravity(), 0))
 		self:set_item(self.itemstring)
 	end,
 

mods/ENVIRONMENT/mcl_physics/api.lua

@@ -22,11 +22,11 @@ function mod.get_environment_effect(pos, vel, staticdata, mass)
 		end
 	end
 
-	if vector.length(v) > 0.01 or vector.length(a) > 0.01 then
-		return v,a
-	else
-		return -- nil,nil
-	end
+	-- Disable small effects
+	if vector.length(v) < 0.01 then v = nil end
+	if vector.length(a) < 0.01 then a = nil end
+
+	return v,a
 end
 
 function mod.apply_entity_environmental_physics(self, data)
@@ -36,6 +36,9 @@ function mod.apply_entity_environmental_physics(self, data)
 	local vel = self.object:get_velocity()
 	local new_velocity,new_acceleration = mcl_physics.get_environment_effect(pos, vel, data, 1)
 
+	if new_velocity then print("new_velocity="..tostring(new_velocity)) end
+	if new_acceleration then print("new_acceleration="..tostring(new_acceleration)) end
+
 	-- Update entity states
 	self._flowing = data.flowing
 

mods/ENVIRONMENT/mcl_physics/init.lua

@@ -5,36 +5,46 @@ mcl_physics = mod
 
 dofile(modpath.."/api.lua")
 
+-- Flowing water
 -- TODO: move to Flowlib
 local FLOW_SPEED = 1.39
+local BOUANCY = 3
 mod.register_environment_effect(function(pos, vel, staticdata)
 	-- Get the node and node definition
-	local node = minetest.get_node_or_nil(pos)
-	if not node then return end
-	local nodedef = minetest.registered_nodes[node.name]
-	if not nodedef then return end
+	local node = minetest.get_node_or_nil(pos); if not node then return end
+	local nodedef = minetest.registered_nodes[node.name]; if not nodedef then return end
 
 	-- Make sure we are in a liquid before continuing
 	local is_flowing = (nodedef.liquidtype == "flowing")
 	staticdata.flowing = is_flowing
-	if not is_flowing then
-		-- Apply decelleration if the entity moved from flowing water to 
-		-- stationary water
-		if nodedef.liquidtype == "source" then
-			return nil,vector.new(
-				0 - vel.x * 0.9,
-				3 - vel.y * 0.9,
-				0 - vel.z * 0.9
-			)
-		end
-		return
-	end
+	if not is_flowing then return end
 
 	-- Get liquid flow direction
 	local vec = vector.multiply(flowlib.quick_flow(pos, node), FLOW_SPEED)
 	return vector.new(vec.x, -0.22, vec.z),nil
 end)
 
+-- Simple gravity and bouency
+mod.register_environment_effect(function(pos, vel, staticdata)
+	-- Get the node and node definition
+	local node = minetest.get_node_or_nil(pos);
+	local nodedef = nil
+	if node then nodedef = minetest.registered_nodes[node.name] end
+
+	if nodedef and nodedef.liquidtype == "source" then
+		-- Apply decceleration and bouancy if the entity moved from flowing water to
+		-- stationary water
+		return nil,vector.new(
+			0 - vel.x * 0.9,
+			BOUANCY - vel.y * 0.9,
+			0 - vel.z * 0.9
+		)
+	else
+		local gravity = tonumber(minetest.settings:get("movement_gravity")) or 9.81
+		return nil,vector.new(0,-gravity,0)
+	end
+end)
+
 -- Node effects
 mod.register_environment_effect(function(pos, vel, staticdata)
 	local pos_r = vector.round(pos)