diff --git a/Source/Contents/Ground/GroundDecals.cpp b/Source/Contents/Ground/GroundDecals.cpp
index 45d37f6..d9c4f11 100644
--- a/Source/Contents/Ground/GroundDecals.cpp
+++ b/Source/Contents/Ground/GroundDecals.cpp
@@ -89,6 +89,11 @@ void GroundGeometry::DrawCellDecal(
   DrawDecal(*this, terrain, matrix, column, row, color, texture, uv, 0.10003052f, context);
 }
 
+// OFFSET: 0x00AC1710
+// FUNCTION: fn_17588
+void GroundGeometry::Slot14(int, int, int, int) {
+}
+
 // OFFSET: 0x00AC1720
 // FUNCTION: fn_17589
 void GroundGeometry::DrawGridDecal(
@@ -108,6 +113,11 @@ void GroundGeometry::DrawGrid(
   this->DrawGridDecal(terrain, matrix, column, row, color, *texture, uv, context);
 }
 
+// OFFSET: 0x00AC3600
+// FUNCTION: fn_17603
+void GroundGeometry::Slot16(int, int, int, int, int, int) {
+}
+
 // OFFSET: 0x00AC3610
 // FUNCTION: fn_17604
 void GroundGeometry::DrawTerrainOverlay(
diff --git a/Source/Contents/Ground/GroundGeometry.h b/Source/Contents/Ground/GroundGeometry.h
index 5e5ee64..a398558 100644
--- a/Source/Contents/Ground/GroundGeometry.h
+++ b/Source/Contents/Ground/GroundGeometry.h
@@ -53,6 +53,8 @@ public:
   void WorldColor(float x, float unusedY, float z, std::uint32_t* output) const;
   void Lighting(int column, int row, float& red, float& green, float& blue) const;
   int Slot12(int first, int second, int third, int fourth, int fifth) const;
+  void Slot14(int first, int second, int third, int fourth);
+  void Slot16(int first, int second, int third, int fourth, int fifth, int sixth);
   void LightmapSample(int column, int row, unsigned char& alpha, unsigned char& red, unsigned char& green, unsigned char& blue) const;
   bool TerrainCellCorners(const class C3dAttr& terrain, int column, int row, float* vertices) const;
   void InitializeLighting(const class C3dAttr& terrain);