lua help: nil, table expected [solved]
Posted: Sun Feb 16, 2014 06:59I have a lua error and I kEep trying to iron this out but my point (voxel) is nil when I try to pass it to the function in a mapgen. Here's the code. I need a fresh pair of eyes to spot the problem.
Thanks, guys. Again, I'm nil hunting here. Might I suggest a separate thread for Lua questions?
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minetest.register_on_generated(function(minp, maxp, seed)
local limit={
XMIN = -33000,
XMAX = 33000,
YMIN = 3000,
YMAX = 5000,
ZMIN = -33000,
ZMAX = 33000,
}
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
local grid = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
local data = vm:get_data()
function get_matter(point)
return minetest.get_node(point).name
end
function get_depth(point)
local y0 = limit.YMIN
local y1 = limit.YMAX
local y = y0
local pi = point
while y <= y1 do
if get_matter(pi) == "air" then
return y
end
y = y + 1
pi = above(pi)
end
return y1
end
function set_matter(point, material)
data[grid:indexp(point)]=minetest.get_content_id(material)
end
function incrementY(point)
local currentValue = math.floor(get_depth(point)) + 1
if (currentValue >= limit.YMAX) then
return
else
set_matter(point, "default:stone")
end
end
function below(point)
return {x=point.x,y=point.y-1,z=point.z}
end
function above(point)
return {x=point.x,y=point.y+1,z=point.z}
end
function north(point)
return {x=point.x,y=point.y,z=point.z-1}
end
function south(point)
return {x=point.x,y=point.y,z=point.z+1}
end
function east(point)
return {x=point.x-1, y=point.y, z=point.z}
end
function west(point)
return {x=point.x+1, y=point.y, z=point.z}
end
function adjacent(point)
return {point, above(point), below(point), north(point), south(point), east(point), west(point)}
end
function level_neigh(point)
local neighbors = {point, north(point), south(point), east(point), west(point)}
return neighbors
end
function sumOfNeighbors(point)
local sum = 0
for ni = 0, #level_neigh(point) do
local nb=level_neigh(point)[ni]
sum = sum + get_depth(nb)
end
return sum
end
function countNeighborsOnLevel(point)
local sum = 0
for ni = 0, #level_neigh(point) do
local nb=level_neigh(point)[ni]
if get_depth(point)==get_depth(nb) then
sum = sum + 1
end
end
return sum
end
function addOneHere(point)
local seed = math.random()
local chance_constant=0.04
local plant = 0
local sn = sumOfNeighbors(point)
local cl = countNeighborsOnLevel(point)
local chanceModifier = (1.0+(chance_constant * sn)) ^ cl
plant = seed * chanceModifier
return plant
end
function generate_chunk()
local x0 = emin.x
local x1 = emax.x
local y0 = emin.y
local z0 = emin.z
local z1 = emax.z
for dz = z0, z1 do
for dx = x0, x1 do
local vi = grid:index(dx, y0, dz)
local point = grid:position(vi)
if addOneHere(point) >= 1.0 then
incrementY(point)
end
end
end
end
generate_chunk()
vm:set_data(data)
vm:set_lighting({day=0, night=0})
vm:calc_lighting()
vm:update_liquids()
vm:write_to_map(data)
vm:update_map()
end)
Thanks, guys. Again, I'm nil hunting here. Might I suggest a separate thread for Lua questions?