diff --git a/src/definition/SurfaceMaterial.cpp b/src/definition/SurfaceMaterial.cpp
index 72b5b7f..f08971a 100644
--- a/src/definition/SurfaceMaterial.cpp
+++ b/src/definition/SurfaceMaterial.cpp
@@ -52,6 +52,16 @@ void SurfaceMaterial::load(PackStream* stream)
     stream->read(&receive_shadows);
 }
 
+void SurfaceMaterial::copy(SurfaceMaterial *destination) const
+{
+    *destination->base = *base;
+    destination->hardness = hardness;
+    destination->reflection = reflection;
+    destination->shininess = shininess;
+    destination->receive_shadows = receive_shadows;
+    destination->validate();
+}
+
 void SurfaceMaterial::validate()
 {
 }
diff --git a/src/definition/SurfaceMaterial.h b/src/definition/SurfaceMaterial.h
index 0c0accf..3a137be 100644
--- a/src/definition/SurfaceMaterial.h
+++ b/src/definition/SurfaceMaterial.h
@@ -17,7 +17,7 @@ public:
 
     void save(PackStream* stream) const;
     void load(PackStream* stream);
-
+    void copy(SurfaceMaterial *destination) const;
     void validate();
 
 public:
diff --git a/src/tests/SpaceSegment_Test.cpp b/src/tests/SpaceSegment_Test.cpp
index 0a9a4aa..c7c219f 100644
--- a/src/tests/SpaceSegment_Test.cpp
+++ b/src/tests/SpaceSegment_Test.cpp
@@ -21,7 +21,7 @@ TEST(SpaceSegment, iterateOnGrid)
     SpaceSegment segment(Vector3(0.5, 1.5, 0.0), Vector3(2.5, 0.5, 0.0));
     segment.iterateOnGrid(it);
 
-    ASSERT_EQ(4, it.locations.size());
+    ASSERT_EQ(4, (int)it.locations.size());
     EXPECT_VECTOR3_COORDS(it.locations[0], 0.0, 1.0, 0.0);
     EXPECT_VECTOR3_COORDS(it.locations[1], 1.0, 1.0, 0.0);
     EXPECT_VECTOR3_COORDS(it.locations[2], 1.0, 0.0, 0.0);
@@ -34,7 +34,7 @@ TEST(SpaceSegment, iterateOnGrid_Corner)
     SpaceSegment segment(Vector3(0.5, 0.5, 0.5), Vector3(2.5, 2.5, 2.5));
     segment.iterateOnGrid(it);
 
-    ASSERT_EQ(7, it.locations.size());
+    ASSERT_EQ(7, (int)it.locations.size());
     EXPECT_VECTOR3_COORDS(it.locations[0], 0.0, 0.0, 0.0);
     EXPECT_VECTOR3_COORDS(it.locations[3], 1.0, 1.0, 1.0);
     EXPECT_VECTOR3_COORDS(it.locations[6], 2.0, 2.0, 2.0);
@@ -46,7 +46,7 @@ TEST(SpaceSegment, iterateOnGrid_OneCell)
     SpaceSegment segment(Vector3(8.1, 8.2, 8.9), Vector3(8.9, 8.3, 8.6));
     segment.iterateOnGrid(it);
 
-    ASSERT_EQ(1, it.locations.size());
+    ASSERT_EQ(1, (int)it.locations.size());
     EXPECT_VECTOR3_COORDS(it.locations[0], 8.0, 8.0, 8.0);
 }
 
@@ -56,6 +56,6 @@ TEST(SpaceSegment, iterateOnGrid_Negative)
     SpaceSegment segment(Vector3(-8.1, -8.2, -8.9), Vector3(-8.9, -8.3, -8.6));
     segment.iterateOnGrid(it);
 
-    ASSERT_EQ(1, it.locations.size());
+    ASSERT_EQ(1, (int)it.locations.size());
     EXPECT_VECTOR3_COORDS(it.locations[0], -9.0, -9.0, -9.0);
 }