RedMew/map_gen/misc/tris_chunk_grid.lua

local b = require "map_gen.shared.builders"

local size = 8 * 32

local concrete = b.tile("concrete") 
local hazard = b.change_tile(b.rectangle(size - 4, size - 4), true, "hazard-concrete-left")
local stone = b.change_tile(b.rectangle(size- 6, size -6), true, "stone-path")
local empty = b.rectangle(size-8, size-8)

local shape = b.any{stone, hazard, concrete}
shape = b.subtract(shape, empty)

shape = b.single_pattern(shape, size, size)

return shape