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Simplify the flow code and allow diagonal directions

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HybridDog 2020-10-10 18:07:58 +02:00
parent 66c222e93b
commit 4f85670e78
1 changed files with 25 additions and 43 deletions
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68
init.lua
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@ -7,8 +7,8 @@ local function is_flowing_liquid(nodename)
return def and def.liquidtype == "flowing" return def and def.liquidtype == "flowing"
end end
-- get_flow_raw determines the fluid flow vector, or returns nothing if -- get_flow_raw determines the horizontal flow vector for a flowing liquid node,
-- the flow is zero -- or returns nothing if the flow is zero
local neighbour_offsets = { local neighbour_offsets = {
{x=-1, y=0, z=0}, {x=-1, y=0, z=0},
{x=1, y=0, z=0}, {x=1, y=0, z=0},
@ -22,50 +22,32 @@ local function get_flow_raw(pos)
-- The liquid has full height and flows downwards -- The liquid has full height and flows downwards
return return
end end
local neighbours = {}
for n = 1, 4 do
local p = vector.add(pos, neighbour_offsets[n])
neighbours[n] = minetest.get_node(p)
end
if param2 < 8 then
-- The liquid does not flow downwards
for i = 1, 4 do
-- Flow to a neighbouring free space if possible
local node = neighbours[i]
local def = minetest.registered_nodes[node.name]
if def and not def.walkable and def.liquidtype == "none" then
return neighbour_offsets[i]
end
end
-- Find a liquid neighbour with lowest height
local min_height_neig = param2
local min_neighbour
for i = 1, 4 do
local node = neighbours[i]
local height_neigh = node.param2 % 8
if height_neigh < min_height_neig
and is_flowing_liquid(node.name) then
min_height_neig = height_neigh
min_neighbour = neighbour_offsets[i]
end
end
if min_neighbour then
return min_neighbour
end
-- No free neighbour and no flowing liquid neighbour
end
-- The flowing liquid ends here in the XZ plane, so determine the
-- flow from higher neighbour nodes
local flow = {x = 0, y = 0, z = 0} local flow = {x = 0, y = 0, z = 0}
for i = 1, 4 do local height = param2 % 8
local node = neighbours[i] for n = 1, 4 do
local height_neigh = node.param2 % 8 local node = minetest.get_node(vector.add(pos, neighbour_offsets[n]))
if is_flowing_liquid(node.name) then local def = minetest.registered_nodes[node.name]
-- A higher liquid is coming from there local height_other
flow = vector.subtract(flow, neighbour_offsets[i]) if not def or def.walkable then
-- A solid node, so no flow happens
height_other = height
elseif def.liquidtype == "source" then
-- Assume that relevant liquid comes from this source
height_other = 8
elseif def.liquidtype == "flowing" then
-- This neighbour is also a flowing liquid
height_other = node.param2 % 8
else
-- There is a free space, e.g. air or a plant
height_other = 0
end end
local fl = vector.multiply(neighbour_offsets[n], height - height_other)
flow = vector.add(flow, fl)
end end
return not vector.equals(flow, {x = 0, y = 0, z = 0}) and flow or nil if vector.equals(flow, {x = 0, y = 0, z = 0}) then
return
end
return vector.normalize(flow)
end end
-- get_flow caches the results from get_flow_raw for 10 s -- get_flow caches the results from get_flow_raw for 10 s