Primordial cavern layer (#12)

* bring in the art assets from ClockGen's "better_caves_modpack" under CC BY 4.0,, code written from scratch.

* update mapgen_helper

* import ClockGen's giant mushroom schematics, make them and giant ferns growable

* add giant jungle mushroom, rough out actual cavern layer code framework

* fungal ceiling decorations

* decorate fungal floor a bit

* update mapgen_helper

* update primordial mushroom schematic placement to ensure it fits

* add giant mycelium fungoidal structure

* add giant mycelium to mapgen

* fix settings for giant mycelium

* make mycelium grow when players aren't present

* allow mycelium growth to pause when it hits unloaded areas

* add a use for giant mycelium

* make giant mushrooms edible, make jungle trees growable

* rough out the jungle biome

* Make a spectrum of jungle growth

* optimize pngs, add is_ground_content to everything

* use custom is_ground_content method

* fix a crash with veinstone, and simplify nvals_cave lookup now that overgen covers the same area

* more fixes for overgen support

* remove unintentional airspace from underside of slade

* fix for overgen crash in level 2

* primordial column material, add sealed shafts to underworld

* add seal block

* Set up puzzle seals to be able to dig a staircase shaft through the slade layer. TODO: the puzzle to guard the trigger.

* puzzle seals now fully functional. Need to add clues for decoding the keys next.

* add a small bit of anti-griefing - the seal breach bell only tolls globally 13 times per activation

* add flowers to the underworld warrior bones

* switch to a different key bell

* fancy up the puzzle seal temples with some custom blocks, add sub-slade grid passages

* add a clue to the seal formspec

* tweak background of inscription 2 so it's less obviously a copy of the background for inscription 1

* switch to compositing to save a few bytes

* fancy up the seal's upper surface with inscriptions to make the formspec feel consistent

* puzzle particle, bones were only spawning on top of structures

* fix ice/oil on level 3, tweak some loot probabilities

* add trail mod support

* remove deprecated files

* boost default plant growth delay, add growing selection boxes

* update map colours

* add named waypoints to the underworld

* try a more efficient way of changing the interiors of columns

* polishing up the Primordial layer

* update guide with some Primordial teasers

* updated magma sea screenshot

* update mapgen_helper and subterrane

* reduce density of megaflora a bit - was too hard to walk through

* spreading_dirt_type depends on light, create my own ABM instead

* add names to the glowing pits and some of the ruins

* separate setting for ruin markers

* record identity of slade-breachers

* make mycelia climbable

* update subterrane

* change surface tunnel detection to allow above-ground stalactites and stalagmites

* add rare thicker Goblin Caps, suitable for use as huts.

* better goblin cap schematics

* update colours

* make it slightly harder to dig down through amethyst sheathing of pits

* fixing up fungus light sensitivity, tree growth code

* fix a few minor bugs

* update deprecated functions

* add various eating sounds

* make mapping kit requirement more flexible

* update spindlestem growth code, remove deprecated functions

* fix leftover undefined variable

* add fireflies to primordial, spread out the post-mapgen node timer for plant matter a bit more.

* fix bones formspec

* add lbm to upgrade old bones

* fix slade undiggability

* make torchspines smokey and manually lightable

* fix drop definitions

* generate dry stalactites in near-surface caverns.

* caverns become far too smokey, alas

* add pitter patter of spore tree spores, alternate paper recipe

* new mapgen_helper metrics

* add smokey back to torchspine now that it can be dialed down a bit

* replace glowstone texture with a new animated one

* switch from ABM to node timer for mapgen mycelium growth

* make mapgen mycelium timer delay configurable

* improve the efficiency of giant mycelium growth using flat node array, fewer dereferences

* remove the smoke from torchspines again - it doesn't dissipate that deep underground

* give slade a more muted, gloomy hue to differentiate it from nether stone

* update screenshots with new slade colors

* update mapgen_helper

df_farming/pig_tail.lua

@@ -17,10 +17,17 @@ local register_pig_tail = function(number)
 		inventory_image = "dfcaverns_pig_tail_"..tostring(number)..".png",
 		paramtype = "light",
 		walkable = false,
+		is_ground_content = false,
 		floodable = true,
 		buildable_to = true,
 		groups = {snappy = 3, flammable = 2, plant = 1, not_in_creative_inventory = 1, attached_node = 1, light_sensitive_fungus = 11},
 		sounds = default.node_sound_leaves_defaults(),
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-8/16, -8/16, -8/16, 8/16, -8/16 + 2*number/16, 8/16},
+            },
+        },
 		
 		on_timer = function(pos, elapsed)
 			df_farming.grow_underground_plant(pos, name, elapsed)
@@ -115,3 +122,40 @@ minetest.register_craft({
 	burntime = 1,
 })
 
+if minetest.get_modpath("trail") and trail and trail.register_trample_node then	
+	minetest.register_node("df_farming:pig_tail_trampled", {
+		description = S("Flattened Pig Tail"),
+		tiles = {"dfcaverns_pig_tail_flattened.png"},
+		inventory_image = "dfcaverns_pig_tail_flattened.png",
+		drawtype = "nodebox",
+		paramtype = "light",
+		paramtype2 = "facedir",
+		buildable_to = true,
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0.5, -3 / 8, 0.5}
+			},
+		},
+		groups = {snappy = 3, flammable = 2, attached_node = 1},
+		drop = "",
+		sounds = default.node_sound_leaves_defaults(),
+	})
+	
+	trail.register_trample_node("df_farming:pig_tail_5", {
+		trampled_node_name = "df_farming:pig_tail_trampled",
+		randomize_trampled_param2 = true,
+	})
+	trail.register_trample_node("df_farming:pig_tail_6", {
+		trampled_node_name = "df_farming:pig_tail_trampled",
+		randomize_trampled_param2 = true,
+	})
+	trail.register_trample_node("df_farming:pig_tail_7", {
+		trampled_node_name = "df_farming:pig_tail_trampled",
+		randomize_trampled_param2 = true,
+	})
+	trail.register_trample_node("df_farming:pig_tail_8", {
+		trampled_node_name = "df_farming:pig_tail_trampled",
+		randomize_trampled_param2 = true,
+	})
+end