diff --git a/LEGO1/lego/legoomni/include/legoentity.h b/LEGO1/lego/legoomni/include/legoentity.h
index dc3864fb..b18799e1 100644
--- a/LEGO1/lego/legoomni/include/legoentity.h
+++ b/LEGO1/lego/legoomni/include/legoentity.h
@@ -57,7 +57,7 @@ class LegoEntity : public MxEntity {
 
 	void FUN_10010c30();
 	void FUN_100114e0(MxU8 p_unk0x59);
-	void SetLocation(Vector3& p_location, Vector3& p_direction, Vector3& p_up, MxBool);
+	void SetLocation(const Vector3& p_location, const Vector3& p_direction, const Vector3& p_up, MxBool);
 
 	inline LegoROI* GetROI() { return m_roi; }
 	inline MxU8 GetFlags() { return m_flags; }
diff --git a/LEGO1/lego/legoomni/include/legoentitypresenter.h b/LEGO1/lego/legoomni/include/legoentitypresenter.h
index 2ff162ec..4e98eb5b 100644
--- a/LEGO1/lego/legoomni/include/legoentitypresenter.h
+++ b/LEGO1/lego/legoomni/include/legoentitypresenter.h
@@ -33,7 +33,7 @@ class LegoEntityPresenter : public MxCompositePresenter {
 	virtual void Init();                                                                   // vtable+0x68
 	virtual undefined4 SetEntity(LegoEntity* p_entity);                                    // vtable+0x6c
 
-	void SetEntityLocation(Vector3& p_location, Vector3& p_direction, Vector3& p_up);
+	void SetEntityLocation(const Vector3& p_location, const Vector3& p_direction, const Vector3& p_up);
 
 	inline LegoEntity* GetInternalEntity() { return m_entity; }
 	inline void SetInternalEntity(LegoEntity* p_entity) { m_entity = p_entity; }
diff --git a/LEGO1/lego/legoomni/src/entity/legoentity.cpp b/LEGO1/lego/legoomni/src/entity/legoentity.cpp
index 0ad52887..c7060136 100644
--- a/LEGO1/lego/legoomni/src/entity/legoentity.cpp
+++ b/LEGO1/lego/legoomni/src/entity/legoentity.cpp
@@ -83,7 +83,7 @@ void LegoEntity::SetROI(LegoROI* p_roi, MxBool p_bool1, MxBool p_bool2)
 }
 
 // STUB: LEGO1 0x100109b0
-void LegoEntity::SetLocation(Vector3& p_location, Vector3& p_direction, Vector3& p_up, MxBool)
+void LegoEntity::SetLocation(const Vector3& p_location, const Vector3& p_direction, const Vector3& p_up, MxBool)
 {
 	// TODO
 }
diff --git a/LEGO1/lego/legoomni/src/entity/legoentitypresenter.cpp b/LEGO1/lego/legoomni/src/entity/legoentitypresenter.cpp
index d6b924fe..0c9ff60f 100644
--- a/LEGO1/lego/legoomni/src/entity/legoentitypresenter.cpp
+++ b/LEGO1/lego/legoomni/src/entity/legoentitypresenter.cpp
@@ -82,7 +82,7 @@ void LegoEntityPresenter::RepeatingTickle()
 }
 
 // FUNCTION: LEGO1 0x10053730
-void LegoEntityPresenter::SetEntityLocation(Vector3& p_location, Vector3& p_direction, Vector3& p_up)
+void LegoEntityPresenter::SetEntityLocation(const Vector3& p_location, const Vector3& p_direction, const Vector3& p_up)
 {
 	if (m_entity) {
 		m_entity->SetLocation(p_location, p_direction, p_up, TRUE);
diff --git a/LEGO1/lego/legoomni/src/entity/legoworldpresenter.cpp b/LEGO1/lego/legoomni/src/entity/legoworldpresenter.cpp
index df6b8f6e..1e34fd6d 100644
--- a/LEGO1/lego/legoomni/src/entity/legoworldpresenter.cpp
+++ b/LEGO1/lego/legoomni/src/entity/legoworldpresenter.cpp
@@ -358,9 +358,9 @@ MxResult LegoWorldPresenter::FUN_100674b0(ModelDbModel& p_model, FILE* p_wdbFile
 
 	MxDSAction action;
 	MxAtomId atom;
-	action.SetLocation(Vector3(p_model.m_location));
-	action.SetDirection(Vector3(p_model.m_direction));
-	action.SetUp(Vector3(p_model.m_direction));
+	action.SetLocation(p_model.m_location);
+	action.SetDirection(p_model.m_direction);
+	action.SetUp(p_model.m_up);
 
 	MxU32 objectId = m_unk0x50;
 	m_unk0x50++;
@@ -375,7 +375,7 @@ MxResult LegoWorldPresenter::FUN_100674b0(ModelDbModel& p_model, FILE* p_wdbFile
 		presenter.SetAction(&action);
 		LegoEntity* entity = (LegoEntity*) presenter.CreateEntity("LegoActor");
 		presenter.SetInternalEntity(entity);
-		presenter.SetEntityLocation(Vector3(p_model.m_location), Vector3(p_model.m_direction), Vector3(p_model.m_up));
+		presenter.SetEntityLocation(p_model.m_location, p_model.m_direction, p_model.m_up);
 		entity->Create(action);
 	}
 	else if (!strcmp(p_model.m_presenterName, "LegoEntityPresenter")) {
@@ -383,7 +383,7 @@ MxResult LegoWorldPresenter::FUN_100674b0(ModelDbModel& p_model, FILE* p_wdbFile
 		presenter.SetAction(&action);
 		createdEntity = (LegoEntity*) presenter.CreateEntity("LegoEntity");
 		presenter.SetInternalEntity(createdEntity);
-		presenter.SetEntityLocation(Vector3(p_model.m_location), Vector3(p_model.m_direction), Vector3(p_model.m_up));
+		presenter.SetEntityLocation(p_model.m_location, p_model.m_direction, p_model.m_up);
 		createdEntity->Create(action);
 	}
 
diff --git a/LEGO1/omni/include/mxdsaction.h b/LEGO1/omni/include/mxdsaction.h
index 6f15b40d..1ba24f40 100644
--- a/LEGO1/omni/include/mxdsaction.h
+++ b/LEGO1/omni/include/mxdsaction.h
@@ -73,9 +73,9 @@ class MxDSAction : public MxDSObject {
 	inline Mx3DPointFloat& GetLocation() { return m_location; }
 	inline Mx3DPointFloat& GetDirection() { return m_direction; }
 	inline Mx3DPointFloat& GetUp() { return m_up; }
-	inline void SetLocation(Vector3& p_location) { m_location = p_location; }
-	inline void SetDirection(Vector3& p_direction) { m_direction = p_direction; }
-	inline void SetUp(Vector3& p_up) { m_up = p_up; }
+	inline void SetLocation(const Vector3& p_location) { m_location = p_location; }
+	inline void SetDirection(const Vector3& p_direction) { m_direction = p_direction; }
+	inline void SetUp(const Vector3& p_up) { m_up = p_up; }
 	inline MxCore* GetUnknown84() { return m_unk0x84; }
 	inline void SetUnknown84(MxCore* p_unk0x84) { m_unk0x84 = p_unk0x84; }
 	inline MxCore* GetOrigin() { return m_origin; }