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README.md
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README.md
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Nether Mod for Minetest, with Portals API.
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# Nether Mod for Minetest, with Portals API.
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Enables Nether portals to be built, opening a gateway between the surface
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realm and one of lava and netherrack, with rumors of a passageway to a great
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magma ocean.
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To view the options provided by this mod, see settingtypes.txt or
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go to "Settings"->"All Settings"->"Mods"->"nether" in the game.
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A Nether portal is built as a rectangular vertical frame of obsidian, 4 blocks
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wide and 5 blocks high. Once constructed, a Mese crystal fragment can be
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right-click/used on the frame to activate it.
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## Modders and game designers
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See portal_api.txt for how to create custom portals to your own realms.
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See settingtypes.txt or go to "Settings"->"All Settings"->"Mods"->"nether"
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in the game to view the options provided by this mod.
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This mod provides Nether basalts (natural, hewn, and chiseled) as nodes which
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require a player to journey to the magma ocean to obtain, so these can be used
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for gating progression through a game. For example, a portal to another realm
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might need to be constructed from basalt, thus requiring a journey through
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the nether first, or basalt might be a crafting ingredient required to reach
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a particular branch of the tech-tree.
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## License of source code:
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@ -161,7 +161,7 @@ minetest.register_node("nether:native_mapgen", {})
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minetest.register_biome({
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name = "nether_caverns",
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node_stone = "nether:native_mapgen", -- nether:native_mapgen is used here to prevent the native mapgen from placing ores and decorations.
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node_filler = "nether:native_mapgen", -- The lua on_generate will transform nether:rack_native into nether:rack then decorate and add ores.
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node_filler = "nether:native_mapgen", -- The lua on_generate will transform nether:native_mapgen into nether:rack then decorate and add ores.
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node_dungeon = "nether:brick",
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node_dungeon_alt = "nether:brick_cracked",
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node_dungeon_stair = "stairs:stair_nether_brick",
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@ -525,7 +525,7 @@ local function on_generated(minp, maxp, seed)
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for y = y0, y1 do -- Y loop first to minimise tcave & lava-sea calculations
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local sea_level, cavern_limit_distance = mapgen.find_nearest_lava_sealevel(y)
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local sea_level, cavern_limit_distance = mapgen.find_nearest_lava_sealevel(y) -- function provided by mapgen_mantle.lua
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local above_lavasea = y > sea_level
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local below_lavasea = y < sea_level
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@ -534,7 +534,7 @@ local function on_generated(minp, maxp, seed)
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local tmantle = CENTER_REGION_LIMIT + centerRegionLimit_adj -- cavern_noise_adj already contains central_region_limit_adj, so tmantle is only for comparisons when cavern_noise_adj hasn't been added to the noise value
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local cavern_noise_adj =
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CENTER_REGION_LIMIT * (cavern_limit_distance * cavern_limit_distance * cavern_limit_distance) -
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centerRegionLimit_adj -- cavern_noise_adj gets added to noise value instead of added to the limit np_noise is compared against, so subtract centerRegionLimit_adj so subtract centerRegionLimit_adj instead of adding
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centerRegionLimit_adj -- cavern_noise_adj gets added to noise value instead of added to the limit np_noise is compared against, so subtract centerRegionLimit_adj instead of adding
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for z = z0, z1 do
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local vi = area:index(x0, y, z) -- Initial voxelmanip index
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@ -548,7 +548,7 @@ local function on_generated(minp, maxp, seed)
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if cave_noise > tcave then
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-- Prime region
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-- This was the only region in initial versions of the Nether mod.
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-- It is the only region that portals from the surface will open into.
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-- It is the only region which portals from the surface will open into.
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data[vi] = c_air
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contains_nether = true
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@ -286,7 +286,7 @@ function excavate_pathway(data, area, nether_pos, center_pos, minp, maxp)
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radiusLimit = math_min(radiusLimit, vector_min(vector.subtract(maxp, stopPos)))
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if radiusLimit < 4 then -- This is a logic check, ignore it. It could be commented out
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-- 4 is (79 - 75), and shouldn't be possible if sampling-skip was 10
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-- 4 is (79 - 75), and values less than 4 shouldn't be possible if sampling-skip was 10
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-- i.e. if sampling-skip was 10 then {5, 15, 25, 35, 45, 55, 65, 75} should be sampled from possible positions 0 to 79
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debugf("Error: radiusLimit %s is smaller then half the sampling distance. min %s, max %s, start %s, stop %s", radiusLimit, minp, maxp, startPos, stopPos)
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end
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@ -304,7 +304,7 @@ function excavate_pathway(data, area, nether_pos, center_pos, minp, maxp)
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local sizeAdj = 1 - (distFromMiddle * distFromMiddle * distFromMiddle)
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local radius = math_min(radiusLimit, math.random(50 - (25 * sizeAdj), 80 - (45 * sizeAdj)) / 10)
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local radiusCubed = radius * radius
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local radiusSquared = radius * radius
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local radiusCeil = math_floor(radius + 0.5)
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linedata[i].radius = radius -- Needed in third pass
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@ -315,7 +315,7 @@ function excavate_pathway(data, area, nether_pos, center_pos, minp, maxp)
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local vi_z = vi + z * zstride
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for y = -radiusCeil, radiusCeil do
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local vi_zy = vi_z + y * ystride
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local xSquaredLimit = radiusCubed - (z * z + y * y)
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local xSquaredLimit = radiusSquared - (z * z + y * y)
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for x = -radiusCeil, radiusCeil do
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if x * x < xSquaredLimit then
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data[vi_zy + x] = c_air
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@ -327,7 +327,7 @@ function excavate_pathway(data, area, nether_pos, center_pos, minp, maxp)
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end
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-- Third pass: decorate
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-- Add glowstones to make tunnels to the mantle easyier to find
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-- Add glowstones to make tunnels to the mantle easier to find
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-- https://i.imgur.com/sRA28x7.jpg
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for i = start_index, stop_index, 3 do
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if linedata[i].distFromEnds < 0.3 then
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@ -22,6 +22,9 @@ one kind of portal with the same frame material — such as obsidian — provide
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the size of the PortalShape is distinct from any other type of portal that is
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using the same node for its frame, and portal sizes remain small.
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The Nether provides three variants of Nether basalt to ensure there are
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alternatives to obsidian for other mods to use as portalstones.
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Realms
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------
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