diff --git a/src/animalposer.cpp b/src/animalposer.cpp
index 94e78c76..53fbfbb4 100644
--- a/src/animalposer.cpp
+++ b/src/animalposer.cpp
@@ -166,6 +166,8 @@ void AnimalPoser::resolveChainRotation(const std::vector<QString> &limbBoneNames
             const float &c = targetBeginBoneLength;
             double cosC = (a*a + b*b - c*c) / (2.0*a*b);
             angleBetweenDistanceAndMiddleBones = qRadiansToDegrees(acos(cosC));
+            if (std::isnan(angleBetweenDistanceAndMiddleBones) || std::isinf(angleBetweenDistanceAndMiddleBones))
+                angleBetweenDistanceAndMiddleBones = 0;
         }
         
         QVector3D targetMiddleBoneStartPosition;
diff --git a/src/animalrigger.cpp b/src/animalrigger.cpp
index ab219496..993739a2 100644
--- a/src/animalrigger.cpp
+++ b/src/animalrigger.cpp
@@ -406,12 +406,7 @@ bool AnimalRigger::rig()
             tailPosition = findExtremPointFrom(spineBoneVertices, spineNode.position);
         }
         
-        QVector3D spineBoneHeadPosition = averagePosition(spineBoneVertices);
-        if (isMainBodyVerticalAligned) {
-            spineBoneHeadPosition.setY(spineNode.coord);
-        } else {
-            spineBoneHeadPosition.setZ(spineNode.coord);
-        }
+        QVector3D spineBoneHeadPosition = spineNode.position;
         
         QString spineName = namingSpine(spineGenerateOrder);
         
diff --git a/src/posedocument.cpp b/src/posedocument.cpp
index 4302e410..ea963627 100644
--- a/src/posedocument.cpp
+++ b/src/posedocument.cpp
@@ -6,6 +6,7 @@
 const float PoseDocument::m_nodeRadius = 0.01;
 const float PoseDocument::m_groundPlaneHalfThickness = 0.01 / 4;
 const bool PoseDocument::m_hideRootAndVirtual = true;
+const float PoseDocument::m_outcomeScaleFactor = 0.5;
 
 bool PoseDocument::hasPastableNodesInClipboard() const
 {
@@ -198,9 +199,9 @@ void PoseDocument::updateRigBones(const std::vector<RiggerBone> *rigBones, const
                 node.partId = m_bonesPartId;
                 node.id = QUuid::createUuid();
                 node.setRadius(m_nodeRadius);
-                node.x = bone.headPosition.x() + 0.5;
-                node.y = -bone.headPosition.y() + 0.5;
-                node.z = -bone.headPosition.z() + 1;
+                node.x = fromOutcomeX(bone.headPosition.x());
+                node.y = fromOutcomeY(bone.headPosition.y());
+                node.z = fromOutcomeZ(bone.headPosition.z());
                 nodeMap[node.id] = node;
                 newAddedNodeIds.insert(node.id);
                 boneIndexToHeadNodeIdMap[edgePair.first] = node.id;
@@ -217,9 +218,9 @@ void PoseDocument::updateRigBones(const std::vector<RiggerBone> *rigBones, const
                 node.partId = m_bonesPartId;
                 node.id = QUuid::createUuid();
                 node.setRadius(m_nodeRadius);
-                node.x = bone.headPosition.x() + 0.5;
-                node.y = -bone.headPosition.y() + 0.5;
-                node.z = -bone.headPosition.z() + 1;
+                node.x = fromOutcomeX(bone.headPosition.x());
+                node.y = fromOutcomeY(bone.headPosition.y());
+                node.z = fromOutcomeZ(bone.headPosition.z());
                 nodeMap[node.id] = node;
                 newAddedNodeIds.insert(node.id);
                 boneIndexToHeadNodeIdMap[edgePair.second] = node.id;
@@ -423,31 +424,31 @@ void PoseDocument::toParameters(std::map<QString, std::map<QString, QString>> &p
 
 float PoseDocument::fromOutcomeX(float x)
 {
-    return x + 0.5;
+    return x * m_outcomeScaleFactor + 0.5;
 }
 
 float PoseDocument::toOutcomeX(float x)
 {
-    return x - 0.5;
+    return (x - 0.5) / m_outcomeScaleFactor;
 }
 
 float PoseDocument::fromOutcomeY(float y)
 {
-    return -y + 0.5;
+    return -y * m_outcomeScaleFactor + 0.5;
 }
 
 float PoseDocument::toOutcomeY(float y)
 {
-    return 0.5 - y;
+    return (0.5 - y) / m_outcomeScaleFactor;
 }
 
 float PoseDocument::fromOutcomeZ(float z)
 {
-    return -z + 1;
+    return -z * m_outcomeScaleFactor + 1;
 }
 
 float PoseDocument::toOutcomeZ(float z)
 {
-    return 1.0 - z;
+    return (1.0 - z) / m_outcomeScaleFactor;
 }
 
diff --git a/src/posedocument.h b/src/posedocument.h
index af9b7bb4..08f3dce7 100644
--- a/src/posedocument.h
+++ b/src/posedocument.h
@@ -53,6 +53,7 @@ public:
     static const float m_nodeRadius;
     static const float m_groundPlaneHalfThickness;
     static const bool m_hideRootAndVirtual;
+    static const float m_outcomeScaleFactor;
     
 private:
     std::map<QString, std::pair<QUuid, QUuid>> m_boneNameToIdsMap;