Minetest.place schematic on vmanip

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Syntax

minetest.place_schematic_on_vmanip(vm, pos, schematic, rotation, replacements, force_placement)

Description

This method works in a similar fashion to minetest.place_schematic, but can be used with a VoxelManip for better performance when manipulating large amounts of nodes.

• Uses VoxelManip object vm, which is the voxel manipulator you are using to e.g. generate terrain
• Places the schematic specified by schematic (see: Schematic specifier) at pos.
• Rotation can be "0", "90", "180", "270", or "random".
• If the rotation parameter is omitted, the schematic is not rotated.
• replacements = {["old_name"] = "convert_to", ...}
• force_placement is a boolean indicating whether nodes other than air and ignore are replaced by the schematic

Note: Schematics are volumes and the position where you place the schematic is the corner of the schematic. If for example you have a 5 by 5 by 5 schematic of a tree whose trunk is in the middle, you will need to offset the x and z position by -2. If you don't, you risk misplacing the tree causing them to float in the air or be generated inside blocks on e.g. steep slopes.

Example

local data = {}
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
for z = minp.z, maxp.z do
	for x = minp.x, maxp.x do
		for y = minp.y-1, maxp.y+1 do
-- E.g. terrain generation code here
		end
	end
end
-- Decoration
for z = minp.z, maxp.z do
	for x = minp.x, maxp.x do
		local ivm = area:index(x, minp.y-1, z)
		for y = minp.y-1, maxp.y+1 do
		    if data[ivm] == minetest.get_content_id("default:dirt_with_dry_grass") and math.random(0, 500) then
			-- We place the tree if there is grass with dirt, but we could also have retrieved the y from the
			-- terrain heightmap in which case we would not necessarily have to loop from minp.y to maxp.y again 
			minetest.place_schematic_on_vmanip(vm, { x = x - 4, y = y, z = z - 4},
								   minetest.get_modpath("default").."/schematics/acacia_tree.mts",
"random", nil, false)

Note: If you place schematics while performing the vmanip of e.g. the terrain from negative y to positive y, you may need to separate your terrain generation loop from the schematic placement loop or risk the schematics to be overwritten