optimize pngs, add is_ground_content to everything

df_farming/cave_wheat.lua

@@ -17,6 +17,7 @@ local register_cave_wheat = function(number)
 		inventory_image = "dfcaverns_cave_wheat_"..tostring(number)..".png",
 		paramtype = "light",
 		walkable = false,
+		is_ground_content = false,
 		buildable_to = true,
 		floodable = true,
 		groups = {snappy = 3, flammable = 2, plant = 1, not_in_creative_inventory = 1, attached_node = 1, light_sensitive_fungus = 11},

df_farming/dimple_cup.lua

@@ -16,6 +16,7 @@ local register_dimple_cup = function(number)
 		paramtype = "light",
 		walkable = false,
 		floodable = true,
+		is_ground_content = false,
 		buildable_to = true,
 		groups = {snappy = 3, flammable = 2, plant = 1, not_in_creative_inventory = 1, attached_node = 1, color_blue = 1, light_sensitive_fungus = 11, flower = 1},
 		sounds = default.node_sound_leaves_defaults(),

df_farming/pig_tail.lua

@@ -17,6 +17,7 @@ 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},

df_farming/plants.lua

@@ -15,6 +15,7 @@ minetest.register_node("df_farming:dead_fungus", {
 	inventory_image = "dfcaverns_dead_fungus.png",
 	paramtype = "light",
 	walkable = false,
+	is_ground_content = false,
 	buildable_to = true,
 	floodable = true,
 	groups = {snappy = 3, flammable = 2, plant = 1, not_in_creative_inventory = 1, attached_node = 1, flow_through = 1},
@@ -47,6 +48,7 @@ minetest.register_node("df_farming:cavern_fungi", {
 	inventory_image = "dfcaverns_fungi.png",
 	paramtype = "light",
 	walkable = false,
+	is_ground_content = false,
 	buildable_to = true,
 	floodable = true,
 	light_source = 6,
@@ -155,6 +157,7 @@ df_farming.register_seed = function(name, description, image, stage_one, grow_ti
 		_dfcaverns_next_stage_time = grow_time,
 		paramtype = "light",
 		walkable = false,
+		is_ground_content = false,
 		floodable = true,
 		sunlight_propagates = true,
 		selection_box = {

df_farming/plump_helmet.lua

@@ -71,6 +71,7 @@ minetest.register_node("df_farming:plump_helmet_spawn", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	node_box = {
 		type = "fixed",
@@ -103,6 +104,7 @@ minetest.register_node("df_farming:plump_helmet_1", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	walkable = false,
 	floodable = true,
 	node_box = {
@@ -141,6 +143,7 @@ minetest.register_node("df_farming:plump_helmet_2", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	node_box = {
 		type = "fixed",
@@ -176,6 +179,7 @@ minetest.register_node("df_farming:plump_helmet_3", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	node_box = {
 		type = "fixed",
@@ -209,6 +213,7 @@ minetest.register_node("df_farming:plump_helmet_4", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	walkable = false,
+	is_ground_content = false,
 	floodable = false, -- I figure full grown plump helmets are sturdy enough to survive inundation
 	node_box = {
 		type = "fixed",
@@ -261,6 +266,7 @@ minetest.register_node("df_farming:plump_helmet_4_picked", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	walkable = false,
+	is_ground_content = false,
 	floodable = false,
 	node_box = {
 		type = "fixed",

df_farming/quarry_bush.lua

@@ -18,6 +18,7 @@ local register_quarry_bush = function(number)
 		paramtype = "light",
 		walkable = false,
 		buildable_to = true,
+		is_ground_content = false,
 		floodable = 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(),

df_farming/sweet_pod.lua

@@ -15,6 +15,7 @@ local register_sweet_pod = function(number)
 		inventory_image = "dfcaverns_sweet_pod_"..tostring(number)..".png",
 		paramtype = "light",
 		walkable = false,
+		is_ground_content = false,
 		buildable_to = true,
 		floodable = true,
 		groups = {snappy = 3, flammable = 2, plant = 1, not_in_creative_inventory = 1, attached_node = 1, light_sensitive_fungus = 11},

df_mapitems/castle_coral.lua

@@ -13,6 +13,7 @@ minetest.register_node("df_mapitems:castle_coral", {
 	_doc_items_longdesc = df_mapitems.doc.castle_coral_desc,
 	_doc_items_usagehelp = df_mapitems.doc.castle_coral_usage,
 	drawtype = "mesh",
+	is_ground_content = false,
 	light_source = 2,
 	mesh = "octagonal_coral.obj",
 	drop = "df_mapitems:castle_coral_skeleton",
@@ -34,6 +35,7 @@ minetest.register_node("df_mapitems:castle_coral_skeleton", {
 	drawtype = "mesh",
 	mesh = "octagonal_coral.obj",
 	paramtype = "light",
+	is_ground_content = false,
 	groups = {cracky = 3},
 	sounds = default.node_sound_stone_defaults(),
 })

df_mapitems/cave_coral.lua

@@ -10,6 +10,7 @@ minetest.register_node("df_mapitems:cave_coral_3", {
 	drop = "default:coral_skeleton",
 	light_source = 3,
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	groups = {cracky = 3, dfcaverns_cave_coral = 1},
 	sounds = default.node_sound_stone_defaults(),
 })
@@ -22,6 +23,7 @@ minetest.register_node("df_mapitems:cave_coral_2", {
 	drop = "default:coral_skeleton",
 	light_source = 2,
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	groups = {cracky = 3, dfcaverns_cave_coral = 1},
 	sounds = default.node_sound_stone_defaults(),
 })
@@ -34,6 +36,7 @@ minetest.register_node("df_mapitems:cave_coral_1", {
 	drop = "default:coral_skeleton",
 	light_source = 1,
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	groups = {cracky = 3, dfcaverns_cave_coral = 1},
 	sounds = default.node_sound_stone_defaults(),
 })

df_mapitems/cave_pearls.lua

@@ -12,6 +12,7 @@ minetest.register_node("df_mapitems:cave_pearls", {
 	paramtype2 = "facedir",
 	groups = {cracky = 2},
 	walkable = false,
+	is_ground_content = false,
 	climbable = true,
 	light_source = 4,
 	node_box = {

df_mapitems/crystals_mese.lua

@@ -8,9 +8,9 @@ minetest.register_node("df_mapitems:glow_mese", {
 	_doc_items_longdesc = df_mapitems.doc.glow_mese_desc,
 	_doc_items_usagehelp = df_mapitems.doc.glow_mese_usage,
 	tiles = {"dfcaverns_glow_mese.png"},
-	is_ground_content = true,
 	groups = {cracky=3},
 	sounds = default.node_sound_glass_defaults(),
+	is_ground_content = false,
 	light_source = 13,
 	paramtype = "light",
 	use_texture_alpha = true,
@@ -36,7 +36,7 @@ minetest.register_node("df_mapitems:mese_crystal", {
 	drawtype = "mesh",
 	mesh = "underch_crystal.obj",
 	light_source = 12,
-	is_ground_content = true,
+	is_ground_content = false,
 	sounds = default.node_sound_glass_defaults(),
 	use_texture_alpha = true,
 	sunlight_propagates = true,

df_mapitems/crystals_ruby.lua

@@ -7,7 +7,7 @@ minetest.register_node("df_mapitems:glow_ruby_ore", {
 	_doc_items_longdesc = df_mapitems.doc.glow_ruby_ore_desc,
 	_doc_items_usagehelp = df_mapitems.doc.glow_ruby_ore_usage,
 	tiles = {"dfcaverns_glow_ruby_ore.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {cracky=2},
 	sounds = default.node_sound_glass_defaults(),
 })
@@ -25,6 +25,7 @@ minetest.register_node("df_mapitems:big_crystal", {
 	use_texture_alpha = true,
 	paramtype = "light",
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	sunlight_propagates = true,
 	light_source = 12,
 	groups = {cracky=2, dfcaverns_big_crystal = 1},
@@ -52,6 +53,7 @@ minetest.register_node("df_mapitems:med_crystal", {
 	use_texture_alpha = true,
 	paramtype = "light",
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	sunlight_propagates = true,
 	light_source = 12,
 	groups = {cracky=2, dfcaverns_big_crystal = 1},
@@ -81,6 +83,7 @@ minetest.register_node("df_mapitems:big_crystal_30", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	light_source = 12,
 	drop = "df_mapitems:big_crystal",
 	groups = {cracky=2, dfcaverns_big_crystal = 1},
@@ -132,6 +135,7 @@ minetest.register_node("df_mapitems:med_crystal_30", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	light_source = 12,
 	drop = "df_mapitems:med_crystal",
 	groups = {cracky=2, dfcaverns_big_crystal = 1},
@@ -168,6 +172,7 @@ minetest.register_node("df_mapitems:big_crystal_30_45", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	light_source = 12,
 	drop = "df_mapitems:big_crystal",
 	groups = {cracky=2, dfcaverns_big_crystal = 1},
@@ -205,6 +210,7 @@ minetest.register_node("df_mapitems:med_crystal_30_45", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	light_source = 12,
 	drop = "df_mapitems:med_crystal",
 	groups = {cracky=2, dfcaverns_big_crystal = 1},

df_mapitems/crystals_salt.lua

@@ -16,6 +16,7 @@ minetest.register_node("df_mapitems:salt_crystal", {
 	sounds = default.node_sound_glass_defaults(),
 	use_texture_alpha = true,
 	sunlight_propagates = true,
+	is_ground_content = false,
 	on_place = df_mapitems.place_against_surface,
 })
 
@@ -26,7 +27,7 @@ minetest.register_node("df_mapitems:salty_cobble", {
 	tiles = {"default_cobble.png^dfcaverns_salty.png"},
 	groups = {cracky = 3, stone = 1, lava_heatable = 1},
 	_magma_conduits_heats_to = "default:cobble",
-	is_ground_content = true,
+	is_ground_content = false,
 	light_source = 2,
 	drop = 'default:cobble',
 	sounds = default.node_sound_stone_defaults(),

df_mapitems/flowstone.lua

@@ -13,6 +13,7 @@ df_mapitems.dry_stalagmite_ids = subterrane.register_stalagmite_nodes("df_mapite
 	},
 	groups = {cracky = 3, stone = 2},
 	sounds = default.node_sound_stone_defaults(),
+	is_ground_content = false,
 })
 
 minetest.register_node("df_mapitems:dry_flowstone", {
@@ -22,7 +23,7 @@ minetest.register_node("df_mapitems:dry_flowstone", {
 	tiles = {"default_stone.png^[brighten"},
 	groups = {cracky = 3, stone = 1, lava_heatable = 1},
 	_magma_conduits_heats_to = "default:cobble",
-	is_ground_content = true,
+	is_ground_content = false,
 	drop = 'default:cobble',
 	sounds = default.node_sound_stone_defaults(),
 })
@@ -38,6 +39,7 @@ df_mapitems.wet_stalagmite_ids = subterrane.register_stalagmite_nodes("df_mapite
 	},
 	groups = {cracky = 3, stone = 2, subterrane_wet_dripstone = 1},
 	sounds = default.node_sound_stone_defaults(),
+	is_ground_content = false,
 }, "df_mapitems:dry_stal")
 
 
@@ -48,7 +50,7 @@ minetest.register_node("df_mapitems:wet_flowstone", {
 	tiles = {"default_stone.png^[brighten^dfcaverns_dripstone_streaks.png"},
 	groups = {cracky = 3, stone = 1, subterrane_wet_dripstone = 1, lava_heatable = 1},
 	_magma_conduits_heats_to = "df_mapitems:dry_flowstone",
-	is_ground_content = true,
+	is_ground_content = false,
 	drop = 'default:cobble',
 	sounds = default.node_sound_stone_defaults(),
 })

df_mapitems/glow_worms.lua

@@ -24,7 +24,7 @@ minetest.register_node("df_mapitems:glow_worm", {
 	},
 	inventory_image = "dfcaverns_glow_worm.png",
 	wield_image = "dfcaverns_glow_worm.png",
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {oddly_breakable_by_hand=3, light_sensitive_fungus = 12},
 	_dfcaverns_dead_node = "air",
 	light_source = 9,

df_mapitems/ground_cover.lua

@@ -15,7 +15,7 @@ minetest.register_node("df_mapitems:dirt_with_cave_moss", {
 		{name = "default_dirt.png^dfcaverns_cave_moss_side.png",
 			tileable_vertical = false}},
 	drop = "default:dirt",
-	is_ground_content = true,
+	is_ground_content = false,
 	light_source = 2,
 	paramtype = "light",
 	groups = {crumbly = 3, soil = 1, light_sensitive_fungus = 8},
@@ -56,7 +56,7 @@ minetest.register_node("df_mapitems:cobble_with_floor_fungus", {
 	_doc_items_usagehelp = df_mapitems.doc.floor_fungus_usage,
 	tiles = {"default_cobble.png^dfcaverns_floor_fungus.png"},
 	drops = "default:cobble",
-	is_ground_content = true,
+	is_ground_content = false,
 	paramtype = "light",
 	groups = {cracky = 3, stone = 2, slippery = 1, light_sensitive_fungus = 8},
 	_dfcaverns_dead_node = "default:cobble",
@@ -71,7 +71,7 @@ minetest.register_node("df_mapitems:cobble_with_floor_fungus_fine", {
 	_doc_items_usagehelp = df_mapitems.doc.floor_fungus_usage,
 	tiles = {"default_cobble.png^dfcaverns_floor_fungus_fine.png"},
 	drops = "default:cobble",
-	is_ground_content = true,
+	is_ground_content = false,
 	paramtype = "light",
 	groups = {cracky = 3, stone = 2, slippery = 1, light_sensitive_fungus = 8},
 	_dfcaverns_dead_node = "default:cobble",
@@ -113,6 +113,7 @@ minetest.register_node("df_mapitems:ice_with_hoar_moss", {
 	drops = "default:ice",
 	paramtype = "light",
 	light_source = 2,
+	is_ground_content = false,
 	groups = {cracky = 3, puts_out_fire = 1, cools_lava = 1, slippery = 2, light_sensitive_fungus = 8},
 	sounds = default.node_sound_glass_defaults(),
 	_dfcaverns_dead_node = "default:ice",

df_mapitems/snareweed.lua

@@ -10,7 +10,7 @@ minetest.register_node("df_mapitems:snareweed", {
 	drawtype="plantlike_rooted",
 	paramtype2 = "leveled",
 	special_tiles = {{name = "dfcaverns_snareweed.png", tileable_vertical = true}},
-	is_ground_content = true,
+	is_ground_content = false,
 	drop = 'default:dirt',
 	light_source = 6,
 	groups = {crumbly = 3, soil = 1},

df_mapitems/veinstone.lua

@@ -9,7 +9,7 @@ minetest.register_node("df_mapitems:veinstone", {
 	tiles = {"default_stone.png^dfcaverns_veins.png"},
 	groups = {cracky = 3, stone = 1, lava_heatable = 1},
 	_magma_conduits_heats_to = "default:cobble",
-	is_ground_content = true,
+	is_ground_content = false,
 	light_source = 2,
 	drop = 'default:cobble',
 	sounds = default.node_sound_stone_defaults(),

df_primordial_items/ceiling_fungus.lua

@@ -43,6 +43,7 @@ minetest.register_node("df_primordial_items:glow_orb_hanging", {
 	paramtype2 = "degrotate",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),

df_primordial_items/fungal_nodes.lua

@@ -18,6 +18,7 @@ minetest.register_node("df_primordial_items:fungal_grass_1", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -35,6 +36,7 @@ minetest.register_node("df_primordial_items:fungal_grass_2", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	place_param2 = 3,
 	sounds = default.node_sound_leaves_defaults(),
@@ -55,6 +57,7 @@ minetest.register_node("df_primordial_items:glow_orb", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 9,
 	sounds = default.node_sound_leaves_defaults(),
@@ -73,6 +76,7 @@ minetest.register_node("df_primordial_items:glow_orb_stalks", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),
@@ -91,6 +95,7 @@ minetest.register_node("df_primordial_items:glow_pods", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),
@@ -105,6 +110,7 @@ minetest.register_node("df_primordial_items:dirt_with_mycelium", {
 	description = S("Dirt With Primordial Mycelium"),
 	tiles = {"dfcaverns_mush_soil.png"},
 	groups = {crumbly = 3, soil = 1},
+	is_ground_content = false,
 	drops = "default:dirt",
 	sounds = default.node_sound_dirt_defaults(),
 	light_source = 3,

df_primordial_items/giant_fern.lua

@@ -38,6 +38,7 @@ minetest.register_node("df_primordial_items:giant_fern_tree_slant_bottom", {
 	drop = "df_primordial_items:giant_fern_tree",
 	groups = {choppy = 2, tree = 1, oddly_breakable_by_hand=1, flammable = 2, fern_stem = 1},
 	sounds = default.node_sound_wood_defaults(),
+	is_ground_content = false,
 	on_place = minetest.rotate_node,
 	selection_box = {
 		type = "fixed",
@@ -74,6 +75,7 @@ minetest.register_node("df_primordial_items:giant_fern_tree_slant_top", {
 	drop = "df_primordial_items:giant_fern_tree",
 	groups = {choppy = 2, tree = 1, oddly_breakable_by_hand=1, flammable = 2, fern_stem = 1},
 	sounds = default.node_sound_wood_defaults(),
+	is_ground_content = false,
 	on_place = minetest.rotate_node,
 	selection_box = {
 		type = "fixed",
@@ -110,6 +112,7 @@ minetest.register_node("df_primordial_items:giant_fern_tree_slant_full", {
 	drop = "df_primordial_items:giant_fern_tree",
 	groups = {choppy = 2, tree = 1, oddly_breakable_by_hand=1, flammable = 2, fern_stem = 1},
 	sounds = default.node_sound_wood_defaults(),
+	is_ground_content = false,
 	on_place = minetest.rotate_node,
 	selection_box = {
 		type = "fixed",
@@ -253,6 +256,7 @@ minetest.register_node("df_primordial_items:fern_sapling", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,

df_primordial_items/jungle_mushroom.lua

@@ -97,6 +97,7 @@ minetest.register_node("df_primordial_items:jungle_mushroom_sapling", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,

df_primordial_items/jungle_nodes.lua

@@ -17,6 +17,7 @@ minetest.register_node("df_primordial_items:fern_1", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -35,6 +36,7 @@ minetest.register_node("df_primordial_items:fern_2", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -55,6 +57,7 @@ minetest.register_node("df_primordial_items:glow_plant_1", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),
@@ -73,6 +76,7 @@ minetest.register_node("df_primordial_items:glow_plant_2", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),
@@ -91,6 +95,7 @@ minetest.register_node("df_primordial_items:glow_plant_3", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),
@@ -113,6 +118,7 @@ minetest.register_node("df_primordial_items:jungle_grass_1", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -130,6 +136,7 @@ minetest.register_node("df_primordial_items:jungle_grass_2", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	place_param2 = 3,
 	sounds = default.node_sound_leaves_defaults(),
@@ -148,6 +155,7 @@ minetest.register_node("df_primordial_items:jungle_grass_3", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	place_param2 = 3,
 	sounds = default.node_sound_leaves_defaults(),
@@ -173,9 +181,9 @@ minetest.register_node("df_primordial_items:jungle_ivy", {
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
 	sunlight_propagates = true,
+	is_ground_content = false,
 	walkable = false,
 	climbable = true,
-	is_ground_content = false,
 	selection_box = {
 		type = "wallmounted",
 	},
@@ -195,6 +203,7 @@ minetest.register_node("df_primordial_items:jungle_mushroom_1", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -212,6 +221,7 @@ minetest.register_node("df_primordial_items:jungle_mushroom_2", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -225,6 +235,7 @@ minetest.register_node("df_primordial_items:dirt_with_jungle_grass", {
 	description = S("Dirt With Primordial Jungle Grass"),
 	tiles = {"dfcaverns_jungle_plant_grass_node_01.png"},
 	groups = {crumbly = 3, soil = 1, spreading_dirt_type = 1},
+	is_ground_content = false,
 	drops = "default:dirt",
 	sounds = default.node_sound_dirt_defaults(),
 })
@@ -233,6 +244,7 @@ minetest.register_node("df_primordial_items:plant_matter", {
 	_doc_items_longdesc = df_primordial_items.doc.plant_matter_desc,
 	_doc_items_usagehelp = df_primordial_items.doc.plant_matter_usage,
 	tiles = {"dfcaverns_jungle_plant_matter_01.png"},
+	is_ground_content = false,
 	groups = {crumbly = 3, soil = 1},
 	sounds = default.node_sound_dirt_defaults(),
 })
@@ -284,6 +296,7 @@ minetest.register_node("df_primordial_items:jungle_roots_2", {
 	drawtype = "plantlike",
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
+	is_ground_content = false,
 	sunlight_propagates = true,
 	walkable = false,
 	climbable = true,
@@ -304,6 +317,7 @@ minetest.register_node("df_primordial_items:jungle_thorns", {
 	paramtype = "light",
 	drawtype = "plantlike",
 	walkable = false,
+	is_ground_content = false,
 	place_param2 = 3,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,

df_primordial_items/jungle_tree.lua

@@ -225,6 +225,7 @@ minetest.register_node("df_primordial_items:jungletree_sapling", {
 	drawtype = "plantlike",
 	buildable_to = true,
 	walkable = false,
+	is_ground_content = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
 	sunlight_propagates = true,

df_primordial_items/primordial_mushroom.lua

@@ -38,6 +38,7 @@ minetest.register_node("df_primordial_items:mushroom_gills", {
 	drawtype = "plantlike",
 	waving = 2,
 	walkable = false,
+	is_ground_content = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
 	sunlight_propagates = true,
@@ -68,6 +69,7 @@ minetest.register_node("df_primordial_items:mushroom_gills_glowing", {
 	drawtype = "plantlike",
 	waving = 2,
 	walkable = false,
+	is_ground_content = false,
 	light_source = 6,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
@@ -652,6 +654,7 @@ minetest.register_node("df_primordial_items:mush_sapling", {
 	drawtype = "plantlike",
 	buildable_to = true,
 	walkable = false,
+	is_ground_content = false,
 	sounds = default.node_sound_leaves_defaults(),
 	use_texture_alpha = true,
 	sunlight_propagates = true,

df_trees/black_cap.lua

@@ -8,7 +8,7 @@ minetest.register_node("df_trees:black_cap_stem", {
 	_doc_items_longdesc = df_trees.doc.black_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.black_cap_usage,
 	tiles = {"dfcaverns_black_cap_top.png","dfcaverns_black_cap_top.png","dfcaverns_black_cap_side.png",},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2},
 	sounds = default.node_sound_wood_defaults(),
 })
@@ -19,7 +19,7 @@ minetest.register_node("df_trees:black_cap", {
 	_doc_items_longdesc = df_trees.doc.black_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.black_cap_usage,
 	tiles = {"dfcaverns_black_cap_top.png","dfcaverns_black_cap_top.png","dfcaverns_black_cap_side.png^[transformR90",},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2},
 	sounds = default.node_sound_wood_defaults(),
 })
@@ -30,7 +30,7 @@ minetest.register_node("df_trees:black_cap_gills", {
 	_doc_items_longdesc = df_trees.doc.black_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.black_cap_usage,
 	tiles = {"dfcaverns_black_cap_gills.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {snappy = 3, leafdecay = 3, flammable = 2, leaves = 1},
 	sounds = default.node_sound_leaves_defaults(),
 	drawtype = "plantlike",
@@ -143,6 +143,7 @@ minetest.register_node("df_trees:black_cap_sapling", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	selection_box = {
 		type = "fixed",

df_trees/blood_thorn.lua

@@ -39,6 +39,7 @@ minetest.register_node("df_trees:blood_thorn", {
 	groups = {choppy = 3, tree = 1, flammable = 2, light_sensitive_fungus = 11},
 	_dfcaverns_dead_node = "df_trees:blood_thorn_dead",
 	sounds = default.node_sound_wood_defaults(),
+	is_ground_content = false,
 	on_place = minetest.rotate_node,
 	after_dig_node = blood_thorn_after_dig,
 })
@@ -53,6 +54,7 @@ minetest.register_node("df_trees:blood_thorn_dead", {
 	paramtype = "light",
 	groups = {choppy = 3, tree = 1, flammable = 2},
 	sounds = default.node_sound_wood_defaults(),
+	is_ground_content = false,
 	on_place = minetest.rotate_node,
 	after_dig_node = blood_thorn_after_dig,
 })
@@ -74,6 +76,7 @@ minetest.register_node("df_trees:blood_thorn_spike", {
 	sounds = default.node_sound_wood_defaults(),
 	drawtype = "nodebox",
 	climbable = true,
+	is_ground_content = false,
 	damage_per_second = 1,
 	paramtype = "light",
 	paramtype2 = "facedir",
@@ -103,6 +106,7 @@ minetest.register_node("df_trees:blood_thorn_spike_dead", {
 	sounds = default.node_sound_wood_defaults(),
 	drawtype = "nodebox",
 	climbable = true,
+	is_ground_content = false,
 	paramtype = "light",
 	paramtype2 = "facedir",
 	node_box = {

df_trees/fungiwood.lua

@@ -115,6 +115,7 @@ minetest.register_node("df_trees:fungiwood_sapling", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	selection_box = {
 		type = "fixed",

df_trees/goblin_cap.lua

@@ -8,7 +8,7 @@ minetest.register_node("df_trees:goblin_cap_stem", {
 	_doc_items_longdesc = df_trees.doc.goblin_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.goblin_cap_usage,
 	tiles = {"dfcaverns_goblin_cap_stem.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2, goblin_cap = 1},
 	sounds = df_trees.node_sound_tree_soft_fungus_defaults(),
 })
@@ -19,7 +19,7 @@ minetest.register_node("df_trees:goblin_cap", {
 	_doc_items_longdesc = df_trees.doc.goblin_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.goblin_cap_usage,
 	tiles = {"dfcaverns_goblin_cap.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2, goblin_cap = 1},
 	sounds = df_trees.node_sound_tree_soft_fungus_defaults(),
 })
@@ -30,7 +30,7 @@ minetest.register_node("df_trees:goblin_cap_gills", {
 	_doc_items_longdesc = df_trees.doc.goblin_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.goblin_cap_usage,
 	tiles = {"dfcaverns_goblin_cap_gills.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {snappy = 3, leafdecay = 3, flammable = 2, leaves = 1, goblin_cap = 1},
 	sounds = default.node_sound_leaves_defaults(),
 	drawtype = "plantlike",
@@ -143,6 +143,7 @@ minetest.register_node("df_trees:goblin_cap_sapling", {
 	wield_image = "dfcaverns_goblin_cap_sapling.png",
 	paramtype = "light",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	walkable = false,
 	floodable = true,
 	selection_box = {

df_trees/nether_cap.lua

@@ -8,7 +8,7 @@ minetest.register_node("df_trees:nether_cap_stem", {
 	_doc_items_longdesc = df_trees.doc.nether_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.nether_cap_usage,
 	tiles = {"dfcaverns_nether_cap_stem.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, puts_out_fire = 1, cools_lava = 1, freezes_water = 1},
 	sounds = default.node_sound_wood_defaults(),
 })
@@ -19,7 +19,7 @@ minetest.register_node("df_trees:nether_cap", {
 	_doc_items_longdesc = df_trees.doc.nether_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.nether_cap_usage,
 	tiles = {"dfcaverns_nether_cap.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, puts_out_fire = 1, cools_lava = 1, freezes_water = 1 },
 	sounds = default.node_sound_wood_defaults({
 		footstep = {name = "default_snow_footstep", gain = 0.2},
@@ -32,7 +32,7 @@ minetest.register_node("df_trees:nether_cap_gills", {
 	_doc_items_longdesc = df_trees.doc.nether_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.nether_cap_usage,
 	tiles = {"dfcaverns_nether_cap_gills.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	light_source = 6,
 	groups = {snappy = 3, leafdecay = 3, leaves = 1, puts_out_fire = 1, cools_lava = 1, freezes_water = 1},
 	sounds = default.node_sound_leaves_defaults(),
@@ -103,6 +103,7 @@ minetest.register_node("df_trees:nether_cap_sapling", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	floodable = true, -- nether cap spawn aren't tough enough to freeze water yet
 	selection_box = {
 		type = "fixed",

df_trees/spindlestem.lua

@@ -64,7 +64,7 @@ minetest.register_node("df_trees:spindlestem_stem", {
 	description = S("Spindlestem"),
 	_doc_items_longdesc = df_trees.doc.spindlestem_desc,
 	_doc_items_usagehelp = df_trees.doc.spindlestem_usage,
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {wood = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2, spindlestem = 1},
 	sounds = default.node_sound_wood_defaults(),
 	tiles = {
@@ -95,7 +95,7 @@ local register_spindlestem_type = function(item_suffix, colour_name, colour_code
 	
 	minetest.register_node(cap_item, {
 		description = S("@1 Spindlestem Cap", colour_name),
-		is_ground_content = true,
+		is_ground_content = false,
 		_doc_items_longdesc = df_trees.doc["spindlestem_cap_"..item_suffix.."_desc"],
 		_doc_items_usagehelp = df_trees.doc["spindlestem_cap_"..item_suffix.."_usage"],
 		groups = {wood = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2, spindlestem = 1},
@@ -241,6 +241,7 @@ minetest.register_node("df_trees:spindlestem_seedling", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
+	is_ground_content = false,
 	walkable = false,
 	floodable = true,
 	node_box = {

df_trees/spore_tree.lua

@@ -157,6 +157,7 @@ minetest.register_node("df_trees:spore_tree_sapling", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	selection_box = {
 		type = "fixed",

df_trees/torchspine.lua

@@ -63,7 +63,7 @@ minetest.register_node("df_trees:torchspine_1", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
-	is_ground_content = true,
+	is_ground_content = false,
 	drops = "default:torch",
 	node_box = {
 		type = "fixed",
@@ -82,7 +82,7 @@ minetest.register_node("df_trees:torchspine_1_lit", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	light_source = 6,
-	is_ground_content = true,
+	is_ground_content = false,
 	drops = "default:torch 2",
 	node_box = {
 		type = "fixed",
@@ -100,7 +100,7 @@ minetest.register_node("df_trees:torchspine_2", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
-	is_ground_content = true,
+	is_ground_content = false,
 	node_box = {
 		type = "fixed",
 		fixed = stal_box_2,
@@ -126,7 +126,7 @@ minetest.register_node("df_trees:torchspine_3", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
-	is_ground_content = true,
+	is_ground_content = false,
 	node_box = {
 		type = "fixed",
 		fixed = stal_box_3,
@@ -156,7 +156,7 @@ minetest.register_node("df_trees:torchspine_4", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
-	is_ground_content = true,
+	is_ground_content = false,
 	node_box = {
 		type = "fixed",
 		fixed = stal_box_4,
@@ -187,6 +187,7 @@ minetest.register_node("df_trees:torchspine_ember", {
 	light_source = 2,
 	paramtype2 = "facedir",
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	node_box = {
 		type = "fixed",

df_trees/tower_cap.lua

@@ -8,7 +8,7 @@ minetest.register_node("df_trees:tower_cap_stem", {
 	_doc_items_longdesc = df_trees.doc.tower_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.tower_cap_usage,
 	tiles = {"dfcaverns_tower_cap.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2, tower_cap = 1},
 	sounds = df_trees.node_sound_tree_soft_fungus_defaults(),
 })
@@ -19,7 +19,7 @@ minetest.register_node("df_trees:tower_cap", {
 	_doc_items_longdesc = df_trees.doc.tower_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.tower_cap_usage,
 	tiles = {"dfcaverns_tower_cap.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {tree = 1, choppy = 2, oddly_breakable_by_hand = 1, flammable = 2, tower_cap = 1},
 	sounds = df_trees.node_sound_tree_soft_fungus_defaults(),
 })
@@ -30,7 +30,7 @@ minetest.register_node("df_trees:tower_cap_gills", {
 	_doc_items_longdesc = df_trees.doc.tower_cap_desc,
 	_doc_items_usagehelp = df_trees.doc.tower_cap_usage,
 	tiles = {"dfcaverns_tower_cap_gills.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {snappy = 3, leafdecay = 3, flammable = 2, leaves = 1, tower_cap = 1},
 	sounds = default.node_sound_leaves_defaults(),
 	drawtype = "plantlike",
@@ -125,6 +125,7 @@ minetest.register_node("df_trees:tower_cap_sapling", {
 	wield_image = "dfcaverns_tower_cap_sapling.png",
 	paramtype = "light",
 	sunlight_propagates = true,
+	is_ground_content = false,
 	walkable = false,
 	floodable = true,
 	selection_box = {

df_trees/tunnel_tube.lua

@@ -17,6 +17,7 @@ minetest.register_node("df_trees:tunnel_tube", {
 	tiles = {"dfcaverns_tunnel_tube.png"},
 	paramtype2 = "facedir",
 	drawtype = "nodebox",
+	is_ground_content = false,
 	paramtype = "light",
 	groups = {choppy = 3, tree = 1, oddly_breakable_by_hand=1, flammable = 2},
 	sounds = default.node_sound_wood_defaults(),
@@ -40,6 +41,7 @@ minetest.register_node("df_trees:tunnel_tube_slant_bottom", {
 	tiles = {"dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png"},
 	paramtype2 = "facedir",
 	drawtype = "mesh",
+	is_ground_content = false,
 	mesh = "tunnel_tube_slant.obj",
 	paramtype = "light",
 	drop = "df_trees:tunnel_tube",
@@ -70,6 +72,7 @@ minetest.register_node("df_trees:tunnel_tube_slant_top", {
 	tiles = {"dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png"},
 	paramtype2 = "facedir",
 	drawtype = "mesh",
+	is_ground_content = false,
 	mesh = "tunnel_tube_slant_2.obj",
 	paramtype = "light",
 	drop = "df_trees:tunnel_tube",
@@ -99,6 +102,7 @@ minetest.register_node("df_trees:tunnel_tube_slant_full", {
 	tiles = {"dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png", "dfcaverns_tunnel_tube.png"},
 	paramtype2 = "facedir",
 	drawtype = "mesh",
+	is_ground_content = false,
 	mesh = "tunnel_tube_slant_full.obj",
 	paramtype = "light",
 	drop = "df_trees:tunnel_tube",
@@ -172,6 +176,7 @@ if df_trees.config.enable_tnt then
 		_doc_items_usagehelp = df_trees.doc.tunnel_tube_usage,
 		tiles = {"dfcaverns_tunnel_tube.png^[multiply:#b09090"},
 		paramtype2 = "facedir",
+		is_ground_content = false,
 		groups = {choppy = 3, oddly_breakable_by_hand=1, flammable = 2, tnt = 1,},
 		sounds = default.node_sound_wood_defaults(),
 		on_place = minetest.rotate_node,
@@ -227,6 +232,7 @@ if df_trees.config.enable_tnt then
 		_doc_items_longdesc = df_trees.doc.tunnel_tube_desc,
 		_doc_items_usagehelp = df_trees.doc.tunnel_tube_usage,
 		tiles = {"dfcaverns_tunnel_tube.png^[multiply:#b09090"},
+		is_ground_content = false,
 		groups = {not_in_creative_inventory = 1,},
 		light_source = 5,
 		drop = "",
@@ -248,6 +254,7 @@ else
 		_doc_items_usagehelp = df_trees.doc.tunnel_tube_usage,
 		tiles = {"dfcaverns_tunnel_tube.png^[multiply:#b09090"},
 		paramtype2 = "facedir",
+		is_ground_content = false,
 		groups = {choppy = 3, oddly_breakable_by_hand=1, flammable = 2},
 		sounds = default.node_sound_wood_defaults(),
 		on_place = minetest.rotate_node,
@@ -285,6 +292,7 @@ minetest.register_node("df_trees:tunnel_tube_sapling", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	selection_box = {
 		type = "fixed",

df_underworld_items/crystals_amethyst.lua

@@ -7,7 +7,7 @@ minetest.register_node("df_underworld_items:glow_amethyst", {
 	_doc_items_longdesc = df_underworld_items.doc.glow_amethyst_desc,
 	_doc_items_usagehelp = df_underworld_items.doc.glow_amethyst_usage,
 	tiles = {"dfcaverns_glow_amethyst.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {cracky=3, pit_plasma_resistant=1},
 	sounds = default.node_sound_glass_defaults(),
 	light_source = 6,

df_underworld_items/glow_stone.lua

@@ -8,7 +8,7 @@ local glowstone_def = {
 	light_source = minetest.LIGHT_MAX,
 	description = S("Lightseam"),
 	tiles = {"dfcaverns_glowstone.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {cracky=3},
 	sounds = default.node_sound_glass_defaults(),
 	paramtype = "light",

df_underworld_items/glowing_pit_plasma.lua

@@ -35,7 +35,7 @@ minetest.register_node("df_underworld_items:pit_plasma", {
 	liquid_alternative_flowing = "df_underworld_items:pit_plasma_flowing",
 	liquid_alternative_source = "df_underworld_items:pit_plasma",
 	liquid_renewable = false,
-	is_ground_content = true,
+	is_ground_content = false,
 	light_source = minetest.LIGHT_MAX,
 	paramtype = "light",
 })
@@ -84,7 +84,7 @@ minetest.register_node("df_underworld_items:pit_plasma_flowing", {
 	liquid_alternative_flowing = "df_underworld_items:pit_plasma_flowing",
 	liquid_alternative_source = "df_underworld_items:pit_plasma",
 	liquid_renewable = false,
-	is_ground_content = true,
+	is_ground_content = false,
 	light_source = minetest.LIGHT_MAX,
 	paramtype = "light",
 })

df_underworld_items/slade.lua

@@ -64,6 +64,7 @@ local slade_wall_def = {
 	paramtype = "light",
 	tiles = {"dfcaverns_slade_brick.png"},
 	walkable = true,
+	is_ground_content = false,
 	groups = { cracky=3, stone=1, level=3, slade=1, pit_plasma_resistant=1, mese_radiation_shield=1},
 	sounds = default.node_sound_stone_defaults({ footstep = { name = "bedrock2_step", gain = 1 } }),
 }
@@ -78,7 +79,7 @@ minetest.register_node("df_underworld_items:slade_sand", {
 	_doc_items_longdesc = df_underworld_items.doc.slade_desc,
 	_doc_items_usagehelp = df_underworld_items.doc.slade_usage,
 	tiles = {"dfcaverns_slade_sand.png"},
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {crumbly = 3, level = 2, falling_node = 1, slade=1, pit_plasma_resistant=1, mese_radiation_shield=1},
 	sounds = default.node_sound_gravel_defaults({
 		footstep = {name = "default_gravel_footstep", gain = 0.45},

ice_sprites/init.lua

@@ -38,6 +38,7 @@ minetest.register_node("ice_sprites:ice_sprite", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	buildable_to = true,
+	is_ground_content = false,
 	walkable = false,
 	groups = {catchable = 1, puts_out_fire = 1, cools_lava = 1, freezes_water = 1},
 	selection_box = {
@@ -75,6 +76,7 @@ minetest.register_node("ice_sprites:hidden_ice_sprite", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	pointable = false,
 	diggable = false,
 	buildable_to = true,
@@ -124,6 +126,7 @@ minetest.register_node("ice_sprites:ice_sprite_bottle", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	light_source = 9,
+	is_ground_content = false,
 	walkable = false,
 	groups = {dig_immediate = 3, attached_node = 1, puts_out_fire = 1, cools_lava = 1, freezes_water = 1},
 	selection_box = {

mine_gas/init.lua

@@ -31,6 +31,7 @@ minetest.register_node("mine_gas:gas", {
 	walkable = false,
 	pointable = false,
 	diggable = false,
+	is_ground_content = false,
 	buildable_to = true,
 	drawtype = "glasslike",
 	drowning = 1,

mine_gas/wisp.lua

@@ -14,6 +14,7 @@ minetest.register_node("mine_gas:gas_wisp", {
 	_doc_items_longdesc = wisp_desc,
 	_doc_items_usagehelp = wisp_usage,
 	walkable = false,
+	is_ground_content = false,
 	diggable = false,
 	buildable_to = true,
 	drawtype = "plantlike",