diff --git a/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp b/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp
index 00b5ecec..40eac915 100644
--- a/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp
+++ b/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp
@@ -388,8 +388,8 @@ MxBool LegoInputManager::ProcessOneEvent(LegoEventNotificationParam& p_param)
 					p_param.SetROI(roi);
 
 					if (roi && roi->GetUnknown0x0c() == 1) {
-						for (OrientableROI* oroi = roi->GetUnknown0xd4(); oroi; oroi = oroi->GetUnknown0xd4()) {
-							roi = (LegoROI*) oroi;
+						for (OrientableROI* parent = roi->GetParentROI(); parent; parent = parent->GetParentROI()) {
+							roi = (LegoROI*) parent;
 						}
 
 						LegoEntity* entity = roi->GetEntity();
diff --git a/LEGO1/lego/sources/roi/legoroi.cpp b/LEGO1/lego/sources/roi/legoroi.cpp
index b985420b..df83cd37 100644
--- a/LEGO1/lego/sources/roi/legoroi.cpp
+++ b/LEGO1/lego/sources/roi/legoroi.cpp
@@ -69,7 +69,7 @@ void LegoROI::configureLegoROI(int p_roiConfig)
 // FUNCTION: LEGO1 0x100a81d0
 LegoROI::LegoROI(Tgl::Renderer* p_renderer) : ViewROI(p_renderer, NULL)
 {
-	m_unk0xd4 = NULL;
+	m_parentROI = NULL;
 	m_name = NULL;
 	m_entity = NULL;
 }
@@ -77,7 +77,7 @@ LegoROI::LegoROI(Tgl::Renderer* p_renderer) : ViewROI(p_renderer, NULL)
 // FUNCTION: LEGO1 0x100a82d0
 LegoROI::LegoROI(Tgl::Renderer* p_renderer, ViewLODList* p_lodList) : ViewROI(p_renderer, p_lodList)
 {
-	m_unk0xd4 = NULL;
+	m_parentROI = NULL;
 	m_name = NULL;
 	m_entity = NULL;
 }
@@ -124,7 +124,7 @@ LegoResult LegoROI::Read(
 	LegoSphere sphere;
 	LegoBox box;
 
-	m_unk0xd4 = p_unk0xd4;
+	m_parentROI = p_unk0xd4;
 
 	if (p_storage->Read(&length, sizeof(length)) != SUCCESS) {
 		goto done;
diff --git a/LEGO1/realtime/orientableroi.cpp b/LEGO1/realtime/orientableroi.cpp
index 2acdb72d..3d2ad0e2 100644
--- a/LEGO1/realtime/orientableroi.cpp
+++ b/LEGO1/realtime/orientableroi.cpp
@@ -16,7 +16,7 @@ OrientableROI::OrientableROI()
 	ZEROVEC3(m_world_velocity);
 	IDENTMAT4(m_local2world);
 
-	m_unk0xd4 = NULL;
+	m_parentROI = NULL;
 	ToggleUnknown0xd8(TRUE);
 }
 
@@ -27,10 +27,36 @@ void OrientableROI::WrappedSetLocalTransform(const Matrix4& p_transform)
 	SetLocalTransform(p_transform);
 }
 
-// STUB: LEGO1 0x100a46b0
-void OrientableROI::FUN_100a46b0(Matrix4& p_transform)
+// FUNCTION: LEGO1 0x100a46b0
+void OrientableROI::FUN_100a46b0(const Matrix4& p_transform)
 {
-	// TODO
+	MxMatrix mat;
+
+	double local2world[4][4];
+	double local2parent[4][4];
+	int i, j;
+
+	for (i = 0; i < 4; i++) {
+		for (j = 0; j < 4; j++) {
+			local2world[i][j] = p_transform[i][j];
+			local2parent[i][j] = m_local2world[i][j];
+		}
+	}
+
+	double local_inverse[4][4];
+	INVERTMAT4d(local_inverse, local2parent);
+
+	double parent2world[4][4];
+	MXM4(parent2world, local_inverse, local2world);
+
+	unsigned int k, l;
+	for (k = 0; k < 4; k++) {
+		for (l = 0; l < 4; l++) {
+			mat[k][l] = parent2world[k][l];
+		}
+	}
+
+	UpdateWorldData(mat);
 }
 
 // Maybe an overload based on MxMatrix type
@@ -43,7 +69,7 @@ void OrientableROI::WrappedVTable0x24(const Matrix4& p_transform)
 // STUB: LEGO1 0x100a50a0
 void OrientableROI::GetLocalTransform(Matrix4& p_transform)
 {
-	// TODO
+	p_transform = m_local2world;
 }
 
 // FUNCTION: LEGO1 0x100a58f0
diff --git a/LEGO1/realtime/orientableroi.h b/LEGO1/realtime/orientableroi.h
index 70db67cb..beec0ef9 100644
--- a/LEGO1/realtime/orientableroi.h
+++ b/LEGO1/realtime/orientableroi.h
@@ -33,7 +33,7 @@ class OrientableROI : public ROI {
 	virtual void UpdateWorldVelocity();                         // vtable+0x2c
 
 	void WrappedSetLocalTransform(const Matrix4& p_transform);
-	void FUN_100a46b0(Matrix4& p_transform);
+	void FUN_100a46b0(const Matrix4& p_transform);
 	void WrappedVTable0x24(const Matrix4& p_transform);
 	void GetLocalTransform(Matrix4& p_transform);
 	void FUN_100a58f0(const Matrix4& p_transform);
@@ -43,7 +43,7 @@ class OrientableROI : public ROI {
 	const float* GetWorldPosition() const { return m_local2world[3]; }
 	const float* GetWorldDirection() const { return m_local2world[2]; }
 	const float* GetWorldUp() const { return m_local2world[1]; }
-	OrientableROI* GetUnknown0xd4() const { return m_unk0xd4; }
+	OrientableROI* GetParentROI() const { return m_parentROI; }
 
 	void ToggleUnknown0xd8(BOOL p_enable)
 	{
@@ -61,7 +61,7 @@ class OrientableROI : public ROI {
 	BoundingBox m_unk0x80;                  // 0x80
 	BoundingSphere m_world_bounding_sphere; // 0xa8
 	Mx3DPointFloat m_world_velocity;        // 0xc0
-	OrientableROI* m_unk0xd4;               // 0xd4
+	OrientableROI* m_parentROI;             // 0xd4
 	undefined4 m_unk0xd8;                   // 0xd8
 };