diff --git a/spine-corona/main.lua b/spine-corona/main.lua
index 1696adde5..b31b93258 100644
--- a/spine-corona/main.lua
+++ b/spine-corona/main.lua
@@ -34,7 +34,7 @@ function loadSkeleton(atlasFile, jsonFile, x, y, scale, animation, skin)
 
 	-- create an animation state object to apply animations to the skeleton
 	local animationStateData = spine.AnimationStateData.new(skeletonData)
-	animationStateData.defaultMix = 0.2
+	animationStateData.defaultMix = 0.5
 	local animationState = spine.AnimationState.new(animationStateData)
 
 	-- set the skeleton invisible
diff --git a/spine-corona/spine-corona/spine.lua b/spine-corona/spine-corona/spine.lua
index edd118b36..30eace287 100644
--- a/spine-corona/spine-corona/spine.lua
+++ b/spine-corona/spine-corona/spine.lua
@@ -28,7 +28,7 @@
 -- POSSIBILITY OF SUCH DAMAGE.
 -------------------------------------------------------------------------------
 
-spine = {}
+local spine = {}
 
 spine.utils = require "spine-lua.utils"
 spine.SkeletonJson = require "spine-lua.SkeletonJson"
@@ -88,7 +88,7 @@ local QUAD_TRIANGLES = { 1, 2, 3, 3, 4, 1 }
 spine.Skeleton.new_super = spine.Skeleton.new
 spine.Skeleton.updateWorldTransform_super = spine.Skeleton.updateWorldTransform
 spine.Skeleton.new = function(skeletonData, group)
-	self = spine.Skeleton.new_super(skeletonData)
+	local self = spine.Skeleton.new_super(skeletonData)
 	self.group = group or display.newGroup()
 	self.drawingGroup = nil
 	self.premultipliedAlpha = false
@@ -156,7 +156,7 @@ function spine.Skeleton:updateWorldTransform()
 		uvs = nil
 	}
 	
-	for i,slot in ipairs(drawOrder) do
+	for _,slot in ipairs(drawOrder) do
 		local attachment = slot.attachment
 		local vertices = nil
 		local uvs = nil
diff --git a/spine-lua/AnimationState.lua b/spine-lua/AnimationState.lua
index a1735d37b..f26a64a11 100644
--- a/spine-lua/AnimationState.lua
+++ b/spine-lua/AnimationState.lua
@@ -198,6 +198,7 @@ function TrackEntry:setTimelineData(to, mixingToArray, propertyIDs)
 	local timelineDipMix = self.timelineDipMix
 
 	local i = 1
+	local skip
 	while i <= timelinesCount do
 		local id = "" .. timelines[i]:getPropertyId()
 		if not (propertyIDs[id] == nil) then
@@ -208,7 +209,7 @@ function TrackEntry:setTimelineData(to, mixingToArray, propertyIDs)
 			local ii = mixingToLast
 			while ii > 0 do
 				local entry = mixingTo[ii]
-				local skip = false
+				skip = false
 				if not entry:hasTimeline(id) then
 					if entry.mixDuration > 0 then 
 						timelineData[i] = DIP_MIX
@@ -343,10 +344,7 @@ function AnimationState:updateMixingFrom (to, delta)
 	local from = to.mixingFrom
 	if from == nil then return true end
 
- 	local finished = self:updateMixingFrom(from, delta)
-	
-	from.animationLast = from.nextAnimationLast
-	from.trackLast = from.nextTrackLast
+ 	local finished = self:updateMixingFrom(from, delta)	
 	
 	-- Require mixTime > 0 to ensure the mixing from entry was applied at least once.
 	if (to.mixTime > 0 and (to.mixTime >= to.mixDuration or to.timeScale == 0)) then
@@ -359,6 +357,8 @@ function AnimationState:updateMixingFrom (to, delta)
 		return finished
 	end
 	
+	from.animationLast = from.nextAnimationLast
+	from.trackLast = from.nextTrackLast
 	from.trackTime = from.trackTime + delta * from.timeScale
 	to.mixTime = to.mixTime + delta * to.timeScale
 	return false;
diff --git a/spine-lua/Atlas.lua b/spine-lua/Atlas.lua
index 4d183c9e4..f3d13a96e 100644
--- a/spine-lua/Atlas.lua
+++ b/spine-lua/Atlas.lua
@@ -33,13 +33,13 @@ local Atlas = {}
 function Atlas.parse(atlasPath, atlasBase)
 	local function parseIntTuple4( l )
 		local a,b,c,d = string.match( l , " ? ?%a+: ([+-]?%d+), ?([+-]?%d+), ?([+-]?%d+), ?([+-]?%d+)" )
-		local a,b,c,d = tonumber( a ), tonumber( b ), tonumber( c ), tonumber( d )
+		a,b,c,d = tonumber( a ), tonumber( b ), tonumber( c ), tonumber( d )
 		return a and b and c and d and {a, b, c ,d}
 	end
 
 	local function parseIntTuple2( l )
 		local a,b = string.match( l , " ? ?%a+: ([+-]?%d+), ?([+-]?%d+)" )
-		local a,b = tonumber( a ), tonumber( b )
+		a,b = tonumber( a ), tonumber( b )
 		return a and b and {a, b}
 	end
 
diff --git a/spine-lua/AtlasAttachmentLoader.lua b/spine-lua/AtlasAttachmentLoader.lua
index a6a7d166f..3533cfddd 100644
--- a/spine-lua/AtlasAttachmentLoader.lua
+++ b/spine-lua/AtlasAttachmentLoader.lua
@@ -69,10 +69,6 @@ function AtlasAttachmentLoader:newMeshAttachment (skin, name, path)
 	return attachment
 end
 
-function AtlasAttachmentLoader:newSkinningMeshAttachment (skin, name, path)
-	return SkinningMeshAttachment.new(name)
-end
-
 function AtlasAttachmentLoader:newBoundingBoxAttachment (skin, name)
 	return BoundingBoxAttachment.new(name)
 end
diff --git a/spine-lua/AttachmentLoader.lua b/spine-lua/AttachmentLoader.lua
index 405e22e27..dfbcf98b8 100644
--- a/spine-lua/AttachmentLoader.lua
+++ b/spine-lua/AttachmentLoader.lua
@@ -48,10 +48,6 @@ function AttachmentLoader.new ()
 		return MeshAttachment.new(name)
 	end
 
-	function self:newSkinningMeshAttachment (skin, name, path)
-		return SkinningMeshAttachment.new(name)
-	end
-
 	function self:newBoundingBoxAttachment (skin, name)
 		return BoundingBoxAttachment.new(name)
 	end
diff --git a/spine-lua/Bone.lua b/spine-lua/Bone.lua
index 5f304db16..967fd23c9 100644
--- a/spine-lua/Bone.lua
+++ b/spine-lua/Bone.lua
@@ -240,7 +240,7 @@ function Bone:getWorldScaleY ()
 	return math_sqrt(self.b * self.b + self.d * self.d)
 end
 
-function updateAppliedTransform ()
+function Bone:updateAppliedTransform ()
 	local parent = self.parent
 	if parent == nil then
 		self.ax = self.worldX
diff --git a/spine-lua/IkConstraint.lua b/spine-lua/IkConstraint.lua
index 3db55f4d9..c5315ba0e 100644
--- a/spine-lua/IkConstraint.lua
+++ b/spine-lua/IkConstraint.lua
@@ -57,7 +57,7 @@ function IkConstraint.new (data, skeleton)
 	setmetatable(self, IkConstraint)
 
 	local self_bones = self.bones
-	for i,boneData in ipairs(data.bones) do
+	for _,boneData in ipairs(data.bones) do
 		table_insert(self_bones, skeleton:findBone(boneData.name))
 	end
 	self.target = skeleton:findBone(data.target.name)
diff --git a/spine-lua/PathConstraint.lua b/spine-lua/PathConstraint.lua
index b8f4ce168..bd724b5bb 100644
--- a/spine-lua/PathConstraint.lua
+++ b/spine-lua/PathConstraint.lua
@@ -78,7 +78,7 @@ function PathConstraint.new (data, skeleton)
 	}
 	setmetatable(self, PathConstraint)
 
-	for i,boneData in ipairs(data.bones) do
+	for _,boneData in ipairs(data.bones) do
 		table_insert(self.bones, skeleton:findBone(boneData.name))
 	end
 
@@ -244,6 +244,7 @@ function PathConstraint:computeWorldPositions (path, spacesCount, tangents, perc
 	local verticesLength = path.worldVerticesLength
 	local curveCount = verticesLength / 6
 	local prevCurve = PathConstraint.NONE
+	local i = 0
 
 	if not path.constantSpeed then
 		local lengths = path.lengths
@@ -251,14 +252,14 @@ function PathConstraint:computeWorldPositions (path, spacesCount, tangents, perc
 		local pathLength = lengths[curveCount + 1];
 		if percentPosition then position = position * pathLength end
 		if percentSpacing then
-			local i = 0
+			i = 0
 			while i < spacesCount do
 				spaces[i + 1] = spaces[i + 1] * pathLength
 				i = i + 1
 			end
 		end
 		world = utils.setArraySize(self.world, 8);
-		local i = 0
+		i = 0
 		local o = 0
 		local curve = 0
 		while i < spacesCount do
@@ -354,7 +355,6 @@ function PathConstraint:computeWorldPositions (path, spacesCount, tangents, perc
 	local ddfy = 0
 	local dfx = 0
 	local dfy = 0
-	i = 0
 	local w = 2
 	while i < curveCount do
 		cx1 = world[w + 1]
@@ -395,7 +395,7 @@ function PathConstraint:computeWorldPositions (path, spacesCount, tangents, perc
 		position = position * pathLength / path.lengths[curveCount];
 	end
 	if percentSpacing then
-		local i = 0
+		i = 0
 		while i < spacesCount do
 			spaces[i + 1] = spaces[i + 1] * pathLength
 			i = i + 1
@@ -404,7 +404,7 @@ function PathConstraint:computeWorldPositions (path, spacesCount, tangents, perc
 
 	local segments = self.segments
 	local curveLength = 0
-	local i = 0
+	i = 0
 	local o = 0
 	local curve = 0
 	local segment = 0
diff --git a/spine-lua/RegionAttachment.lua b/spine-lua/RegionAttachment.lua
index 66c061658..20d8268f2 100644
--- a/spine-lua/RegionAttachment.lua
+++ b/spine-lua/RegionAttachment.lua
@@ -85,6 +85,7 @@ function RegionAttachment.new (name)
 		y = y + bone.worldY
 		local m00, m01, m10, m11 = bone.m00, bone.m01, bone.m10, bone.m11
 		local offset = self.offset
+		local vertices = self.vertices;
 		vertices[0] = offset[0] * m00 + offset[1] * m01 + x
 		vertices[1] = offset[0] * m10 + offset[1] * m11 + y
 		vertices[2] = offset[2] * m00 + offset[3] * m01 + x
diff --git a/spine-lua/Skeleton.lua b/spine-lua/Skeleton.lua
index bfdb77525..e93d5bc3e 100644
--- a/spine-lua/Skeleton.lua
+++ b/spine-lua/Skeleton.lua
@@ -68,7 +68,7 @@ function Skeleton.new (data)
 	}
 	setmetatable(self, Skeleton)
 
-	for i,boneData in ipairs(data.bones) do
+	for _,boneData in ipairs(data.bones) do
 		local bone = nil
 		if boneData.parent == nil then
 			bone = Bone.new(boneData, self, nil)
@@ -80,7 +80,7 @@ function Skeleton.new (data)
 		table_insert(self.bones, bone)
 	end
 
-	for i,slotData in ipairs(data.slots) do
+	for _,slotData in ipairs(data.slots) do
 		local bone = self.bones[slotData.boneData.index]
 		local slot = Slot.new(slotData, bone)
 		table_insert(self.slots, slot)
@@ -88,15 +88,15 @@ function Skeleton.new (data)
 		table_insert(self.drawOrder, slot)
 	end
 
-	for i,ikConstraintData in ipairs(data.ikConstraints) do
+	for _, ikConstraintData in ipairs(data.ikConstraints) do
 		table_insert(self.ikConstraints, IkConstraint.new(ikConstraintData, self))
 	end
 
-	for i, transformConstraintData in ipairs(data.transformConstraints) do
+	for _, transformConstraintData in ipairs(data.transformConstraints) do
 		table_insert(self.transformConstraints, TransformConstraint.new(transformConstraintData, self))
 	end
 
-	for i, pathConstraintData in ipairs(data.pathConstraints) do
+	for _, pathConstraintData in ipairs(data.pathConstraints) do
 		table_insert(self.pathConstraints, PathConstraint.new(pathConstraintData, self))
 	end
 
@@ -113,7 +113,7 @@ function Skeleton:updateCache ()
 	self.updateCacheReset = {}
 
 	local bones = self.bones
-	for i, bone in ipairs(bones) do
+	for _, bone in ipairs(bones) do
 		bone.sorted = false
 	end
 
@@ -167,7 +167,7 @@ function Skeleton:updateCache ()
 		i = i + 1
 	end
 	
-	for i, bone in ipairs(self.bones) do
+	for _, bone in ipairs(self.bones) do
 		self:sortBone(bone)
 	end
 end
@@ -183,7 +183,7 @@ function Skeleton:sortIkConstraint (constraint)
 	if #constrained > 1 then
 		local child = constrained[#constrained]
 		local contains = false
-		for i,updatable in ipairs(self._updateCache) do
+		for _, updatable in ipairs(self._updateCache) do
 			if updatable == child then
 				contains = true
 				break
@@ -202,11 +202,11 @@ function Skeleton:sortPathConstraint(constraint)
 	local slot = constraint.target
 	local slotIndex = slot.data.index
 	local slotBone = slot.bone
-	if self.skin then self:sortPathConstraintAttachment(skin, slotIndex, slotBone) end
-	if self.data.defaultSkin and not (self.data.defaultSkin == skin) then
+	if self.skin then self:sortPathConstraintAttachment(self.skin, slotIndex, slotBone) end
+	if self.data.defaultSkin and not (self.data.defaultSkin == self.skin) then
 		self:sortPathConstraintAttachment(self.data.defaultSkin, slotIndex, slotBone)
 	end
-	for i,skin in ipairs(self.data.skins) do
+	for _,skin in ipairs(self.data.skins) do
 		self:sortPathConstraintAttachment(skin, slotIndex, slotBone)
 	end
 	
@@ -214,17 +214,17 @@ function Skeleton:sortPathConstraint(constraint)
 	if attachment and attachment.type == AttachmentType.path then self:sortPathConstraintAttachmentWith(attachment, slotBone) end
 	
 	local constrained = constraint.bones
-	for i,bone in ipairs(constrained) do
+	for _,bone in ipairs(constrained) do
 		self:sortBone(bone)
 	end
 	
 	table_insert(self._updateCache, constraint)
 	
-	for i,bone in ipairs(constrained) do
+	for _,bone in ipairs(constrained) do
 		self:sortReset(bone.children)
 	end
 	
-	for i,bone in ipairs(constrained) do
+	for _,bone in ipairs(constrained) do
 		bone.sorted = true
 	end
 end
@@ -234,11 +234,11 @@ function Skeleton:sortTransformConstraint(constraint)
 	
 	local constrained = constraint.bones	
 	if constraint.data.local_ then
-		for i,bone in ipairs(constrained) do
+		for _,bone in ipairs(constrained) do
 			local child = constrained[#constrained]
 			local contains = false
-			sortBone(child.parent)
-			for i,updatable in ipairs(self._updateCache) do
+			self:sortBone(child.parent)
+			for _,updatable in ipairs(self._updateCache) do
 				if updatable == child then
 					contains = true
 					break
@@ -247,18 +247,18 @@ function Skeleton:sortTransformConstraint(constraint)
 			if not contains then table_insert(self.updateCacheReset, child) end
 		end
 	else
-		for i,bone in ipairs(constrained) do
+		for _,bone in ipairs(constrained) do
 			self:sortBone(bone)
 		end
 	end
 	
 	table_insert(self._updateCache, constraint)
 	
-	for i,bone in ipairs(constrained) do
+	for _,bone in ipairs(constrained) do
 		self:sortReset(bone.children)
 	end
 	
-	for i,bone in ipairs(constrained) do
+	for _,bone in ipairs(constrained) do
 		bone.sorted = true
 	end
 end
@@ -266,7 +266,7 @@ end
 function Skeleton:sortPathConstraintAttachment(skin, slotIndex, slotBone)
 	local attachments = skin.attachments[slotIndex]
 	if not attachments then return end
-	for key,attachment in pairs(attachments) do
+	for _,attachment in pairs(attachments) do
 		self:sortPathConstraintAttachmentWith(attachment, slotBone)
 	end
 end
@@ -301,7 +301,7 @@ function Skeleton:sortBone(bone)
 end
 
 function Skeleton:sortReset(bones)
-	for i, bone in ipairs(bones) do
+	for _, bone in ipairs(bones) do
 		if bone.sorted then self:sortReset(bone.children) end
 		bone.sorted = false
 	end
@@ -310,7 +310,7 @@ end
 -- Updates the world transform for each bone and applies IK constraints.
 function Skeleton:updateWorldTransform ()
 	local updateCacheReset = self.updateCacheReset
-	for i,bone in ipairs(updateCacheReset) do
+	for _,bone in ipairs(updateCacheReset) do
 		bone.ax = bone.x
 		bone.ay = bone.y
 		bone.arotation = bone.rotation
@@ -322,7 +322,7 @@ function Skeleton:updateWorldTransform ()
 	end
 	
 	local updateCache = self._updateCache
-	for i, updatable in ipairs(updateCache) do
+	for _, updatable in ipairs(updateCache) do
 		updatable:update()
 	end
 end
@@ -333,17 +333,17 @@ function Skeleton:setToSetupPose ()
 end
 
 function Skeleton:setBonesToSetupPose ()
-	for i,bone in ipairs(self.bones) do
+	for _,bone in ipairs(self.bones) do
 		bone:setToSetupPose()
 	end
 
-	for i,ikConstraint in ipairs(self.ikConstraints) do
+	for _,ikConstraint in ipairs(self.ikConstraints) do
 		ikConstraint.bendDirection = ikConstraint.data.bendDirection
 		ikConstraint.mix = ikConstraint.data.mix
 	end
 
 	local transformConstraints = self.transformConstraints
-	for i, constraint in ipairs(transformConstraints) do
+	for _, constraint in ipairs(transformConstraints) do
 		local data = constraint.data
 		constraint.rotateMix = data.rotateMix
 		constraint.translateMix = data.translateMix
@@ -352,7 +352,7 @@ function Skeleton:setBonesToSetupPose ()
 	end
 
 	local pathConstraints = self.pathConstraints
-	for i, constraint in ipairs(pathConstraints) do
+	for _, constraint in ipairs(pathConstraints) do
 		local data = constraint.data
 		constraint.position = data.position
 		constraint.spacing = data.spacing
@@ -374,7 +374,7 @@ end
 
 function Skeleton:findBone (boneName)
 	if not boneName then error("boneName cannot be nil.", 2) end
-	for i,bone in ipairs(self.bones) do
+	for _,bone in ipairs(self.bones) do
 		if bone.data.name == boneName then return bone end
 	end
 	return nil
@@ -463,8 +463,8 @@ end
 
 function Skeleton:findIkConstraint(constraintName)
 	if not constraintName then error("constraintName cannot be null.", 2) end
-	local ikConstaints = self.ikConstraints
-	for i, ikConstraint in ipairs(ikConstraints) do
+	local ikConstraints = self.ikConstraints
+	for _, ikConstraint in ipairs(ikConstraints) do
 		if ikConstraint.data.name == constraintName then return ikConstraint end
 	end
 	return nil
@@ -473,7 +473,7 @@ end
 function Skeleton:findTransformConstraint(constraintName)
 	if not constraintName then error("constraintName cannot be null.", 2) end
 	local transformConstraints = self.transformConstraints
-	for i, transformConstraint in ipairs(transformConstraints) do
+	for _, transformConstraint in ipairs(transformConstraints) do
 		if transformConstraint.data.name == constraintName then return transformConstraint end
 	end
 	return nil
@@ -482,7 +482,7 @@ end
 function Skeleton:findPathConstraint(constraintName)
 	if not constraintName then error("constraintName cannot be null.", 2) end
 	local pathConstraints = self.pathConstraints
-	for i, pathConstraint in ipairs(pathConstraints) do
+	for _, pathConstraint in ipairs(pathConstraints) do
 		if pathConstraint.data.name == constraintName then return pathConstraint end
 	end
 	return nil
@@ -496,7 +496,7 @@ function Skeleton:getBounds(offset, size)
 			local minY = 99999999
 			local maxX = -99999999
 			local maxY = -99999999
-			for i, slot in ipairs(drawOrder) do
+			for _, slot in ipairs(drawOrder) do
 				local vertices = {}
 				local attachment = slot.attachment
 				if attachment then
diff --git a/spine-lua/SkeletonBounds.lua b/spine-lua/SkeletonBounds.lua
index 27e2b3f31..113cd478e 100644
--- a/spine-lua/SkeletonBounds.lua
+++ b/spine-lua/SkeletonBounds.lua
@@ -59,7 +59,7 @@ function SkeletonBounds:update (skeleton, updateAabb)
 	self.polygons = polygons
 	local slots = skeleton.slots
 
-	for i,slot in ipairs(skeleton.slots) do
+	for _,slot in ipairs(skeleton.slots) do
 		local attachment = slot.attachment
 		if attachment and attachment.type == AttachmentType.boundingbox then
 			local boundingBox = attachment
@@ -85,7 +85,7 @@ end
 function SkeletonBounds:aabbCompute ()
 	local minX, minY, maxX, maxY = 9999999, 9999999, -9999999, -9999999
 	local polygons = self.polygons
-	for i,vertices in ipairs(polygons) do
+	for _,vertices in ipairs(polygons) do
 		local count = #vertices
 		for ii = 1, count, 2 do
 			local x = vertices[ii]
@@ -179,7 +179,7 @@ function SkeletonBounds:polygonIntersectsSegment (polygon, x1, y1, x2, y2)
 end
 
 function SkeletonBounds:getPolygon (attachment)
-	local index = spine.utils.indexOf(self.boundingBoxes, attachment)
+	local index = utils.indexOf(self.boundingBoxes, attachment)
 	if index == -1 then
 		return nil
 	else
diff --git a/spine-lua/SkeletonClipping.lua b/spine-lua/SkeletonClipping.lua
index 49d88f181..692a7a534 100644
--- a/spine-lua/SkeletonClipping.lua
+++ b/spine-lua/SkeletonClipping.lua
@@ -66,7 +66,7 @@ function SkeletonClipping:clipStart(slot, clip)
 	clip:computeWorldVertices(slot, 0, n, vertices, 0, 2)
 	self:makeClockwise(self.clippingPolygon)
 	self.clippingPolygons = self.triangulator:decompose(self.clippingPolygon, self.triangulator:triangulate(self.clippingPolygon))
-	for i,polygon in ipairs(self.clippingPolygons) do
+	for _,polygon in ipairs(self.clippingPolygons) do
 		self:makeClockwise(polygon)
 		table_insert(polygon, polygon[1])
 		table_insert(polygon, polygon[2])		
@@ -274,7 +274,7 @@ function SkeletonClipping:clip(x1, y1, x2, y2, x3, y3, clippingArea, output)
 		end
 
 		if outputStart == #output then -- All edges outside.
-			for i, v in ipairs(originalOutput) do
+			for i, _ in ipairs(originalOutput) do
 				originalOutput[i] = nil
 			end
 			return true
@@ -286,7 +286,7 @@ function SkeletonClipping:clip(x1, y1, x2, y2, x3, y3, clippingArea, output)
 		if (i == clippingVerticesLast) then break end
 		local temp = output
 		output = input
-		for i, v in ipairs(output) do
+		for i, _ in ipairs(output) do
 			output[i] = nil
 		end
 		input = temp
@@ -294,7 +294,7 @@ function SkeletonClipping:clip(x1, y1, x2, y2, x3, y3, clippingArea, output)
 	end
 
 	if originalOutput ~= output then
-		for i, v in ipairs(originalOutput) do
+		for i, _ in ipairs(originalOutput) do
 			originalOutput[i] = nil
 		end
 		i = 1
diff --git a/spine-lua/SkeletonData.lua b/spine-lua/SkeletonData.lua
index 0d358cf20..0e6543df0 100644
--- a/spine-lua/SkeletonData.lua
+++ b/spine-lua/SkeletonData.lua
@@ -56,7 +56,7 @@ end
 
 function SkeletonData:findBone (boneName)
 	if not boneName then error("boneName cannot be nil.", 2) end
-	for i,bone in ipairs(self.bones) do
+	for _,bone in ipairs(self.bones) do
 		if bone.name == boneName then return bone end
 	end
 	return nil
@@ -85,7 +85,7 @@ end
 
 function SkeletonData:findSkin (skinName)
 	if not skinName then error("skinName cannot be nil.", 2) end
-	for i,skin in ipairs(self.skins) do
+	for _,skin in ipairs(self.skins) do
 		if skin.name == skinName then return skin end
 	end
 	return nil
@@ -93,7 +93,7 @@ end
 
 function SkeletonData:findEvent (eventName)
 	if not eventName then error("eventName cannot be nil.", 2) end
-	for i,event in ipairs(self.events) do
+	for _,event in ipairs(self.events) do
 		if event.name == eventName then return event end
 	end
 	return nil
@@ -101,7 +101,7 @@ end
 
 function SkeletonData:findAnimation (animationName)
 	if not animationName then error("animationName cannot be nil.", 2) end
-	for i,animation in ipairs(self.animations) do
+	for _,animation in ipairs(self.animations) do
 		if animation.name == animationName then return animation end
 	end
 	return nil
@@ -109,7 +109,7 @@ end
 
 function SkeletonData:findIkConstraint (constraintName)
 	if not constraintName then error("constraintName cannot be nil.", 2) end
-	for i,constraint in ipairs(self.ikConstraints) do
+	for _,constraint in ipairs(self.ikConstraints) do
 		if constraint.name == constraintName then return constraint end
 	end
 	return nil
@@ -117,7 +117,7 @@ end
 
 function SkeletonData:findTransformConstraint (constraintName)
 	if not constraintName then error("constraintName cannot be nil.", 2) end
-	for i,constraint in ipairs(self.transformConstraints) do
+	for _,constraint in ipairs(self.transformConstraints) do
 		if constraint.name == constraintName then return constraint end
 	end
 	return nil
@@ -125,7 +125,7 @@ end
 
 function SkeletonData:findPathConstraint (constraintName)
 	if not constraintName then error("constraintName cannot be nil.", 2) end
-	for i,constraint in ipairs(self.pathConstraints) do
+	for _,constraint in ipairs(self.pathConstraints) do
 		if constraint.name == constraintName then return constraint end
 	end
 	return nil
diff --git a/spine-lua/SkeletonJson.lua b/spine-lua/SkeletonJson.lua
index e170b5f24..57116c61d 100644
--- a/spine-lua/SkeletonJson.lua
+++ b/spine-lua/SkeletonJson.lua
@@ -60,7 +60,7 @@ function SkeletonJson.new (attachmentLoader)
 	}
 
 	function self:readSkeletonDataFile (fileName, base)
-		return self:readSkeletonData(spine.utils.readFile(fileName, base))
+		return self:readSkeletonData(utils.readFile(fileName, base))
 	end
 
 	local readAttachment
@@ -76,7 +76,7 @@ function SkeletonJson.new (attachmentLoader)
 	function self:readSkeletonData (jsonText)
 		local scale = self.scale
 		local skeletonData = SkeletonData.new(self.attachmentLoader)
-		local root = spine.utils.readJSON(jsonText)
+		local root = utils.readJSON(jsonText)
 		if not root then error("Invalid JSON: " .. jsonText, 2) end
 
 		-- Skeleton.
@@ -117,7 +117,6 @@ function SkeletonJson.new (attachmentLoader)
 		-- Slots.
 		if root["slots"] then
 			for i,slotMap in ipairs(root["slots"]) do
-				local index = i
 				local slotName = slotMap["name"]
 				local boneName = slotMap["bone"]
 				local boneData = skeletonData:findBone(boneName)
@@ -151,11 +150,11 @@ function SkeletonJson.new (attachmentLoader)
 
 		-- IK constraints.
 		if root["ik"] then
-			for i,constraintMap in ipairs(root["ik"]) do
+			for _,constraintMap in ipairs(root["ik"]) do
 				local data = IkConstraintData.new(constraintMap["name"])
 				data.order = getValue(constraintMap, "order", 0)
 
-				for i,boneName in ipairs(constraintMap["bones"]) do
+				for _,boneName in ipairs(constraintMap["bones"]) do
 					local bone = skeletonData:findBone(boneName)
 					if not bone then error("IK bone not found: " .. boneName) end
 					table_insert(data.bones, bone)
@@ -174,11 +173,11 @@ function SkeletonJson.new (attachmentLoader)
 
 		-- Transform constraints
 		if root["transform"] then
-			for i,constraintMap in ipairs(root["transform"]) do
-				data = TransformConstraintData.new(constraintMap.name)
+			for _,constraintMap in ipairs(root["transform"]) do
+				local data = TransformConstraintData.new(constraintMap.name)
 				data.order = getValue(constraintMap, "order", 0)
 
-				for i,boneName in ipairs(constraintMap.bones) do
+				for _,boneName in ipairs(constraintMap.bones) do
 					local bone = skeletonData:findBone(boneName)
 					if not bone then error("Transform constraint bone not found: " .. boneName, 2) end
 					table_insert(data.bones, bone)
@@ -186,7 +185,7 @@ function SkeletonJson.new (attachmentLoader)
 
 				local targetName = constraintMap.target
 				data.target = skeletonData:findBone(targetName)
-				if not data.target then error("Transform constraint target bone not found: " .. boneName, 2) end
+				if not data.target then error("Transform constraint target bone not found: " .. (targetName or "none"), 2) end
 
 				data.offsetRotation = getValue(constraintMap, "rotation", 0);
 				data.offsetX = getValue(constraintMap, "x", 0) * scale;
@@ -206,11 +205,11 @@ function SkeletonJson.new (attachmentLoader)
 
 		-- Path constraints
 		if root["path"] then
-			for i,constraintMap in ipairs(root.path) do
+			for _,constraintMap in ipairs(root.path) do
 				local data = PathConstraintData.new(constraintMap.name);
 				data.order = getValue(constraintMap, "order", 0)
 
-				for i,boneName in ipairs(constraintMap.bones) do
+				for _,boneName in ipairs(constraintMap.bones) do
 					local bone = skeletonData:findBone(boneName)
 					if not bone then error("Path constraint bone not found: " .. boneName, 2) end
 					table_insert(data.bones, bone)
@@ -254,7 +253,7 @@ function SkeletonJson.new (attachmentLoader)
 		end
 
 		-- Linked meshes
-		for i, linkedMesh in ipairs(self.linkedMeshes) do
+		for _, linkedMesh in ipairs(self.linkedMeshes) do
 			local skin = skeletonData.defaultSkin
 			if linkedMesh.skin then skin = skeletonData:findSkin(linkedMesh.skin) end
 			if not skin then error("Skin not found: " .. linkedMesh.skin) end
@@ -331,7 +330,7 @@ function SkeletonJson.new (attachmentLoader)
 
 		elseif type == AttachmentType.mesh or type == AttachmentType.linkedmesh then
 			local mesh = attachmentLoader:newMeshAttachment(skin, name, path)
-			if not mesh then return null end
+			if not mesh then return nil end
 			mesh.path = path
 
 			local color = map.color
@@ -487,7 +486,7 @@ function SkeletonJson.new (attachmentLoader)
 						timeline.slotIndex = slotIndex
 
 						local frameIndex = 0
-						for i,valueMap in ipairs(values) do
+						for _,valueMap in ipairs(values) do
 							local color = valueMap["color"]
 							timeline:setFrame(
 								frameIndex, valueMap["time"],
@@ -506,7 +505,7 @@ function SkeletonJson.new (attachmentLoader)
 						timeline.slotIndex = slotIndex
 
 						local frameIndex = 0
-						for i,valueMap in ipairs(values) do
+						for _,valueMap in ipairs(values) do
 							local light = valueMap["light"]
 							local dark = valueMap["dark"]
 							timeline:setFrame(
@@ -529,7 +528,7 @@ function SkeletonJson.new (attachmentLoader)
 						timeline.slotIndex = slotIndex
 
 						local frameIndex = 0
-						for i,valueMap in ipairs(values) do
+						for _,valueMap in ipairs(values) do
 							local attachmentName = valueMap["name"]
 							timeline:setFrame(frameIndex, valueMap["time"], attachmentName)
 							frameIndex = frameIndex + 1
@@ -557,7 +556,7 @@ function SkeletonJson.new (attachmentLoader)
 						timeline.boneIndex = boneIndex
 
 						local frameIndex = 0
-						for i,valueMap in ipairs(values) do
+						for _,valueMap in ipairs(values) do
 							timeline:setFrame(frameIndex, valueMap["time"], valueMap["angle"])
 							readCurve(valueMap, timeline, frameIndex)
 							frameIndex = frameIndex + 1
@@ -579,7 +578,7 @@ function SkeletonJson.new (attachmentLoader)
 						timeline.boneIndex = boneIndex
 
 						local frameIndex = 0
-						for i,valueMap in ipairs(values) do
+						for _,valueMap in ipairs(values) do
 							local x = (valueMap["x"] or 0) * timelineScale
 							local y = (valueMap["y"] or 0) * timelineScale
 							timeline:setFrame(frameIndex, valueMap["time"], x, y)
@@ -608,7 +607,7 @@ function SkeletonJson.new (attachmentLoader)
 					end
 				end
 				local frameIndex = 0
-				for i,valueMap in ipairs(values) do
+				for _,valueMap in ipairs(values) do
 					local mix = 1
 					if valueMap["mix"] ~= nil then mix = valueMap["mix"] end
 					local bendPositive = 1
@@ -635,7 +634,7 @@ function SkeletonJson.new (attachmentLoader)
 					end
 				end
 				local frameIndex = 0
-				for i,valueMap in ipairs(values) do
+				for _,valueMap in ipairs(values) do
 					timeline:setFrame(frameIndex, valueMap.time, getValue(valueMap, "rotateMix", 1), getValue(valueMap, "translateMix", 1), getValue(valueMap, "scaleMix", 1), getValue(valueMap, "shearMix", 1))
 					readCurve(valueMap, timeline, frameIndex)
 					frameIndex = frameIndex + 1
@@ -664,7 +663,7 @@ function SkeletonJson.new (attachmentLoader)
 						end
 						timeline.pathConstraintIndex = index
 						local frameIndex = 0
-						for i,valueMap in ipairs(timelineMap) do
+						for _,valueMap in ipairs(timelineMap) do
 							timeline:setFrame(frameIndex, valueMap.time, getValue(valueMap, timelineName, 0) * timelineScale)
 							readCurve(valueMap, timeline, frameIndex)
 							frameIndex = frameIndex + 1
@@ -675,7 +674,7 @@ function SkeletonJson.new (attachmentLoader)
 						local timeline = Animation.PathConstraintMixTimeline.new(#timelineMap)
 						timeline.pathConstraintIndex = index
 						local frameIndex = 0
-						for i,valueMap in ipairs(timelineMap) do
+						for _,valueMap in ipairs(timelineMap) do
 							timeline:setFrame(frameIndex, valueMap.time, getValue(valueMap, "rotateMix", 1), getValue(valueMap, "translateMix", 1))
 							readCurve(valueMap, timeline, frameIndex)
 							frameIndex = frameIndex + 1
@@ -708,7 +707,7 @@ function SkeletonJson.new (attachmentLoader)
 						timeline.attachment = attachment
 
 						local frameIndex = 0
-						for i,valueMap in ipairs(timelineMap) do
+						for _,valueMap in ipairs(timelineMap) do
 							local deform = nil
 							local verticesValue = getValue(valueMap, "vertices", nil)
 							if verticesValue == nil then
@@ -754,7 +753,7 @@ function SkeletonJson.new (attachmentLoader)
 			local timeline = Animation.DrawOrderTimeline.new(#drawOrderValues)
 			local slotCount = #skeletonData.slots
 			local frameIndex = 0
-			for i,drawOrderMap in ipairs(drawOrderValues) do
+			for _,drawOrderMap in ipairs(drawOrderValues) do
 				local drawOrder = nil
 				local offsets = drawOrderMap["offsets"]
 				if offsets then
@@ -762,7 +761,7 @@ function SkeletonJson.new (attachmentLoader)
 					local unchanged = {}
 					local originalIndex = 1
 					local unchangedIndex = 1
-					for ii,offsetMap in ipairs(offsets) do
+					for _,offsetMap in ipairs(offsets) do
 						local slotIndex = skeletonData:findSlotIndex(offsetMap["slot"])
 						if slotIndex == -1 then error("Slot not found: " .. offsetMap["slot"]) end
 						-- Collect unchanged items.
@@ -801,7 +800,7 @@ function SkeletonJson.new (attachmentLoader)
 		if events then
 			local timeline = Animation.EventTimeline.new(#events)
 			local frameIndex = 0
-			for i,eventMap in ipairs(events) do
+			for _,eventMap in ipairs(events) do
 				local eventData = skeletonData:findEvent(eventMap["name"])
 				if not eventData then error("Event not found: " .. eventMap["name"]) end
 				local event = Event.new(eventMap["time"], eventData)
diff --git a/spine-lua/Skin.lua b/spine-lua/Skin.lua
index f0c1c5fda..a403ab9a6 100644
--- a/spine-lua/Skin.lua
+++ b/spine-lua/Skin.lua
@@ -86,14 +86,14 @@ end
 
 function Skin:findNamesForSlot (slotIndex)
 	local names = {}
-	for k,v in self.attachments do
+	for _,v in self.attachments do
 		if v[1] == slotIndex then table_insert(names, v[2]) end
 	end
 end
 
 function Skin:findAttachmentsForSlot (slotIndex)
 	local attachments = {}
-	for k,v in self.attachments do
+	for _,v in self.attachments do
 		if v[1] == slotIndex then table_insert(attachments, v[3]) end
 	end
 end
diff --git a/spine-lua/TextureAtlas.lua b/spine-lua/TextureAtlas.lua
index 96cf5f847..d586002b2 100644
--- a/spine-lua/TextureAtlas.lua
+++ b/spine-lua/TextureAtlas.lua
@@ -235,14 +235,14 @@ function TextureAtlas:parse (atlasContent, imageLoader)
 end
 
 function TextureAtlas:findRegion(name)
-	for i, region in ipairs(self.regions) do
+	for _, region in ipairs(self.regions) do
 		if region.name == name then return region end
 	end
 	return nil
 end
 
 function TextureAtlas:dispose()
-	for i, page in ipairs(self.pairs) do
+	for _, page in ipairs(self.pairs) do
 		-- FIXME implement disposing of pages
 		-- love2d doesn't support manual disposing
 	end
diff --git a/spine-lua/TransformConstraint.lua b/spine-lua/TransformConstraint.lua
index 5f97b8936..436366ba1 100644
--- a/spine-lua/TransformConstraint.lua
+++ b/spine-lua/TransformConstraint.lua
@@ -41,6 +41,7 @@ local table_insert = table.insert
 local math_deg = math.deg
 local math_rad = math.rad
 local math_abs = math.abs
+local math_floor = math.floor
 
 local TransformConstraint = {}
 TransformConstraint.__index = TransformConstraint
@@ -58,7 +59,7 @@ function TransformConstraint.new (data, skeleton)
 	}
 	setmetatable(self, TransformConstraint)
 
-	for i,bone in ipairs(data.bones) do
+	for _,bone in ipairs(data.bones) do
 		table_insert(self.bones, skeleton:findBone(bone.name))
 	end
 	self.target = skeleton:findBone(data.target.name)
@@ -101,7 +102,7 @@ function TransformConstraint:applyAbsoluteWorld ()
 	local offsetRotation = self.data.offsetRotation * degRadReflect
 	local offsetShearY = self.data.offsetShearY * degRadReflect
 	local bones = self.bones
-	for i, bone in ipairs(bones) do
+	for _, bone in ipairs(bones) do
 		local modified = false
 		if rotateMix ~= 0 then
 			local a = bone.a
@@ -188,7 +189,7 @@ function TransformConstraint:applyRelativeWorld ()
 	local offsetRotation = self.data.offsetRotation * degRadReflect
 	local offsetShearY = self.data.offsetShearY * degRadReflect
 	local bones = self.bones
-	for i, bone in ipairs(bones) do
+	for _, bone in ipairs(bones) do
 		local modified = false
 		
 		if rotateMix ~= 0 then
@@ -226,7 +227,7 @@ function TransformConstraint:applyRelativeWorld ()
 			local s = (math_sqrt(ta * ta + tc * tc) - 1 + self.data.offsetScaleX) * scaleMix + 1
 			bone.a = bone.a * s
 			bone.c = bone.c * s
-			local s = (math_sqrt(tb * tb + td * td) - 1 + self.data.offsetScaleY) * scaleMix + 1
+			s = (math_sqrt(tb * tb + td * td) - 1 + self.data.offsetScaleY) * scaleMix + 1
 			bone.b = bone.b * s
 			bone.d = bone.d * s
 			modified = true
@@ -260,7 +261,7 @@ function TransformConstraint:applyAbsoluteLocal ()
 	local target = self.target
 	if not target.appliedValid then target:updatedAppliedTransform() end
 	local bones = self.bones
-	for i, bone in ipairs(bones) do
+	for _, bone in ipairs(bones) do
 		local modified = false
 		if not bone.appliedValid then bone:updateAppliedTransform() end
 		
@@ -308,7 +309,7 @@ function TransformConstraint:applyRelativeLocal ()
 	local target = self.target
 	if not target.appliedValid then target:updateAppliedTransform() end
 	local bones = self.bones
-	for i, bone in ipairs(bones) do
+	for _, bone in ipairs(bones) do
 		if not bone.appliedValid then bone:updateAppliedTransform() end
 
 		local rotation = bone.arotation
@@ -328,7 +329,7 @@ function TransformConstraint:applyRelativeLocal ()
 				scaleX = scaleX * (((target.ascaleX - 1 + self.data.offsetScaleX) * scaleMix) + 1)
 			end
 			if scaleY > 0.00001 then
-				scaleY = scaleY * (((target.ascaleY - 1 + this.data.offsetScaleY) * scaleMix) + 1)
+				scaleY = scaleY * (((target.ascaleY - 1 + self.data.offsetScaleY) * scaleMix) + 1)
 			end
 		end