diff --git a/LEGO1/lego/sources/roi/legoroi.cpp b/LEGO1/lego/sources/roi/legoroi.cpp
index d4649093..e5f5e490 100644
--- a/LEGO1/lego/sources/roi/legoroi.cpp
+++ b/LEGO1/lego/sources/roi/legoroi.cpp
@@ -404,10 +404,34 @@ LegoResult LegoROI::FUN_100a8da0(LegoTreeNode* p_node, const Matrix4& p_matrix,
 	return SUCCESS;
 }
 
-// STUB: LEGO1 0x100a8e80
-void LegoROI::FUN_100a8e80(LegoTreeNode*, Matrix4&, LegoTime, LegoROI**)
+// FUNCTION: LEGO1 0x100a8e80
+void LegoROI::FUN_100a8e80(LegoTreeNode* p_node, Matrix4& p_matrix, LegoTime p_time, LegoROI** p_rois)
 {
-	// TODO
+	MxMatrix mat;
+
+	LegoAnimNodeData* data = (LegoAnimNodeData*) p_node->GetData();
+	FUN_100a8cb0(data, p_time, mat);
+
+	LegoROI* roi = p_rois[data->GetUnknown0x20()];
+	if (roi != NULL) {
+		roi->m_local2world.Product(mat, p_matrix);
+		roi->VTable0x1c();
+
+		LegoBool und = data->FUN_100a0990(p_time);
+		roi->SetVisibility(und);
+
+		for (LegoU32 i = 0; i < p_node->GetNumChildren(); i++) {
+			FUN_100a8e80(p_node->GetChild(i), roi->m_local2world, p_time, p_rois);
+		}
+	}
+	else {
+		MxMatrix local2world;
+		local2world.Product(mat, p_matrix);
+
+		for (LegoU32 i = 0; i < p_node->GetNumChildren(); i++) {
+			FUN_100a8e80(p_node->GetChild(i), local2world, p_time, p_rois);
+		}
+	}
 }
 
 // FUNCTION: LEGO1 0x100a90f0
diff --git a/LEGO1/lego/sources/roi/legoroi.h b/LEGO1/lego/sources/roi/legoroi.h
index 32ce1371..68309a91 100644
--- a/LEGO1/lego/sources/roi/legoroi.h
+++ b/LEGO1/lego/sources/roi/legoroi.h
@@ -32,7 +32,7 @@ class LegoROI : public ViewROI {
 	);
 	LegoROI* FUN_100a8ce0(const LegoChar* p_name, LegoROI* p_roi);
 	LegoResult FUN_100a8da0(LegoTreeNode* p_node, const Matrix4& p_matrix, LegoTime p_time, LegoROI* p_roi);
-	static void FUN_100a8e80(LegoTreeNode*, Matrix4&, LegoTime, LegoROI**);
+	static void FUN_100a8e80(LegoTreeNode* p_node, Matrix4& p_matrix, LegoTime p_time, LegoROI** p_rois);
 	LegoResult SetFrame(LegoAnim* p_anim, LegoTime p_time);
 	LegoResult FUN_100a9170(LegoFloat p_red, LegoFloat p_green, LegoFloat p_blue, LegoFloat p_alpha);
 	LegoResult FUN_100a9210(LegoTextureInfo* p_textureInfo);