diff --git a/README.md b/README.md
index d726438..e513605 100644
--- a/README.md
+++ b/README.md
@@ -91,6 +91,22 @@ Replace all instances of <search node> with <place node> in the current WorldEdi
     //replace dirt flowers:flower_waterlily
     //replace flowers:flower_rose flowers:flower_tulip
 
+### //hollowsphere <radius> <node>
+
+Add hollow sphere at WorldEdit position 1 with radius <radius>, composed of <node>.
+
+    //hollowsphere 5 dirt
+    //hollowsphere 12 default:glass
+    //hollowsphere 17 mesecons:mesecon
+
+### //sphere <radius> <node>
+
+Add sphere at WorldEdit position 1 with radius <radius>, composed of <node>.
+
+    //sphere 5 dirt
+    //sphere 12 default:glass
+    //sphere 17 mesecons:mesecon
+
 ### //hollowcylinder x/y/z/? <length> <radius> <node>
 
 Add hollow cylinder at WorldEdit position 1 along the x/y/z/? axis with length <length> and radius <radius>, composed of <node>.
@@ -228,15 +244,27 @@ Replaces all instances of `searchnode` with `replacenode` in a region defined by
 
 Returns the number of nodes replaced.
 
+### worldedit.hollow_sphere = function(pos, radius, nodename)
+
+Adds a hollow sphere at `pos` with radius `radius`, composed of `nodename`.
+
+Returns the number of nodes added.
+
+### worldedit.sphere = function(pos, radius, nodename)
+
+Adds a sphere at `pos` with radius `radius`, composed of `nodename`.
+
+Returns the number of nodes added.
+
 ### worldedit.hollow_cylinder(pos, axis, length, radius, nodename)
 
-Adds a hollow cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`.
+Adds a hollow cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`, composed of `nodename`.
 
 Returns the number of nodes added.
 
 ### worldedit.cylinder(pos, axis, length, radius, nodename)
 
-Adds a cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`.
+Adds a cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`, composed of `nodename`.
 
 Returns the number of nodes added.
 
diff --git a/functions.lua b/functions.lua
index 2d16daf..4b98a84 100644
--- a/functions.lua
+++ b/functions.lua
@@ -75,7 +75,50 @@ worldedit.replace = function(pos1, pos2, searchnode, replacenode)
 	return count
 end
 
---adds a hollow cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`, returning the number of nodes added
+--adds a hollow sphere at `pos` with radius `radius`, composed of `nodename`, returning the number of nodes added
+worldedit.hollow_sphere = function(pos, radius, nodename)
+	local node = {name=nodename}
+	local pos1 = {x=0, y=0, z=0}
+	local full_radius = radius * radius + radius
+	local env = minetest.env
+	for x = -radius, radius do
+		pos1.x = pos.x + x
+		for y = -radius, radius do
+			pos1.y = pos.y + y
+			for z = -radius, radius do
+				if x*x+y*y+z*z >= (radius-1) * (radius-1) + (radius-1) and x*x+y*y+z*z <= full_radius then
+					pos1.z = pos.z + z
+					env:add_node({x=pos.x+x,y=pos.y+y,z=pos.z+z}, node)
+				end
+			end
+		end
+	end
+end
+
+--adds a sphere at `pos` with radius `radius`, composed of `nodename`, returning the number of nodes added
+worldedit.sphere = function(pos, radius, nodename)
+	local node = {name=nodename}
+	local pos1 = {x=0, y=0, z=0}
+	local full_radius = radius * radius + radius
+	local count = 0
+	local env = minetest.env
+	for x = -radius, radius do
+		pos1.x = pos.x + x
+		for y = -radius, radius do
+			pos1.y = pos.y + y
+			for z = -radius, radius do
+				if x*x+y*y+z*z <= full_radius then
+					pos1.z = pos.z + z
+					env:add_node(pos1, node)
+					count = count + 1
+				end
+			end
+		end
+	end
+	return count
+end
+
+--adds a hollow cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`, composed of `nodename`, returning the number of nodes added
 worldedit.hollow_cylinder = function(pos, axis, length, radius, nodename)
 	local other1, other2
 	if axis == "x" then
@@ -90,6 +133,11 @@ worldedit.hollow_cylinder = function(pos, axis, length, radius, nodename)
 	local currentpos = {x=pos.x, y=pos.y, z=pos.z}
 	local node = {name=nodename}
 	local count = 0
+	local step = 1
+	if length < 0
+		length = -length
+		step = -1
+	end
 	for i = 1, length do
 		local offset1, offset2 = 0, radius
 		local delta = -radius
@@ -126,12 +174,12 @@ worldedit.hollow_cylinder = function(pos, axis, length, radius, nodename)
 			end
 			offset1 = offset1 + 1
 		end
-		currentpos[axis] = currentpos[axis] + 1
+		currentpos[axis] = currentpos[axis] + step
 	end
 	return count
 end
 
---adds a cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`, returning the number of nodes added
+--adds a cylinder at `pos` along the `axis` axis ("x" or "y" or "z") with length `length` and radius `radius`, composed of `nodename`, returning the number of nodes added
 worldedit.cylinder = function(pos, axis, length, radius, nodename)
 	local other1, other2
 	if axis == "x" then
@@ -146,6 +194,11 @@ worldedit.cylinder = function(pos, axis, length, radius, nodename)
 	local currentpos = {x=pos.x, y=pos.y, z=pos.z}
 	local node = {name=nodename}
 	local count = 0
+	local step = 1
+	if length < 0
+		length = -length
+		step = -1
+	end
 	for i = 1, length do
 		local offset1, offset2 = 0, radius
 		local delta = -radius
@@ -180,12 +233,12 @@ worldedit.cylinder = function(pos, axis, length, radius, nodename)
 				delta = delta - (offset2 * 2)
 			end
 		end
-		currentpos[axis] = currentpos[axis] + 1
+		currentpos[axis] = currentpos[axis] + step
 	end
 	return count
 end
 
---adds a spiral at `pos` with size `size`, returning the number of nodes changed
+--adds a spiral at `pos` with size `size`, composed of `nodename`, returning the number of nodes changed
 worldedit.spiral = function(pos, size, nodename)
 	local shift_x, shift_y
 	sa = spiralt(size)
diff --git a/init.lua b/init.lua
index 1e9b0ef..a7e1947 100644
--- a/init.lua
+++ b/init.lua
@@ -189,6 +189,58 @@ minetest.register_chatcommand("/replace", {
 	end,
 })
 
+minetest.register_chatcommand("/hollowsphere", {
+	params = "<radius> <node>",
+	description = "Add hollow sphere at WorldEdit position 1 with radius <radius>, composed of <node>",
+	privs = {worldedit=true},
+	func = function(name, param)
+		local pos = worldedit.pos1[name]
+		if pos == nil then
+			minetest.chat_send_player(name, "No WorldEdit region selected")
+			return
+		end
+
+		local found, _, radius, nodename = param:find("^(%d+)%s+([^%s]+)$")
+		if found == nil then
+			minetest.chat_send_player(name, "Invalid usage: " .. param)
+			return
+		end
+		if not worldedit.node_is_valid(pos, nodename) then
+			minetest.chat_send_player(name, "Invalid node name: " .. param)
+			return
+		end
+
+		local count = worldedit.hollow_sphere(pos, tonumber(radius), nodename)
+		minetest.chat_send_player(name, count .. " nodes added")
+	end,
+})
+
+minetest.register_chatcommand("/sphere", {
+	params = "<radius> <node>",
+	description = "Add sphere at WorldEdit position 1 with radius <radius>, composed of <node>",
+	privs = {worldedit=true},
+	func = function(name, param)
+		local pos = worldedit.pos1[name]
+		if pos == nil then
+			minetest.chat_send_player(name, "No WorldEdit region selected")
+			return
+		end
+
+		local found, _, radius, nodename = param:find("^(%d+)%s+([^%s]+)$")
+		if found == nil then
+			minetest.chat_send_player(name, "Invalid usage: " .. param)
+			return
+		end
+		if not worldedit.node_is_valid(pos, nodename) then
+			minetest.chat_send_player(name, "Invalid node name: " .. param)
+			return
+		end
+
+		local count = worldedit.sphere(pos, tonumber(radius), nodename)
+		minetest.chat_send_player(name, count .. " nodes added")
+	end,
+})
+
 minetest.register_chatcommand("/hollowcylinder", {
 	params = "x/y/z/? <length> <radius> <node>",
 	description = "Add hollow cylinder at WorldEdit position 1 along the x/y/z/? axis with length <length> and radius <radius>, composed of <node>",