diff --git a/GraphicsAPI/IGraphicsApi.cs b/GraphicsAPI/IGraphicsApi.cs
index d2a987bd4..6116d6194 100644
--- a/GraphicsAPI/IGraphicsApi.cs
+++ b/GraphicsAPI/IGraphicsApi.cs
@@ -122,11 +122,11 @@ namespace ClassicalSharp.GraphicsAPI {
 		
 		public abstract void DeleteIb( int ib );
 		
-		public abstract void DrawVb( DrawMode mode, VertexFormat format, int id, int verticesCount );
+		public abstract void DrawVb( DrawMode mode, VertexFormat format, int id, int offset, int verticesCount );
 		
 		public abstract void BeginVbBatch( VertexFormat format );
 		
-		public abstract void DrawVbBatch( DrawMode mode, int id, int verticesCount );
+		public abstract void DrawVbBatch( DrawMode mode, int id, int offset, int verticesCount );
 		
 		public abstract void EndVbBatch();
 		
diff --git a/GraphicsAPI/OpenGLApi.cs b/GraphicsAPI/OpenGLApi.cs
index 6b4064ab5..23f12f201 100644
--- a/GraphicsAPI/OpenGLApi.cs
+++ b/GraphicsAPI/OpenGLApi.cs
@@ -190,10 +190,10 @@ namespace ClassicalSharp.GraphicsAPI {
 		#if TRACK_RESOURCES
 		Dictionary<int, string> vbs = new Dictionary<int, string>();
 		#endif
-		Action<DrawMode, int, int> drawBatchFunc;
-		Action<DrawMode, int, int> drawBatchFuncTex2f;
-		Action<DrawMode, int, int> drawBatchFuncCol4b;
-		Action<DrawMode, int, int> drawBatchFuncTex2fCol4b;
+		Action<DrawMode, int, int, int> drawBatchFunc;
+		Action<DrawMode, int, int, int> drawBatchFuncTex2f;
+		Action<DrawMode, int, int, int> drawBatchFuncCol4b;
+		Action<DrawMode, int, int, int> drawBatchFuncTex2fCol4b;
 		
 		
 		public override int CreateDynamicVb( VertexFormat format, int maxVertices ) {
@@ -235,7 +235,7 @@ namespace ClassicalSharp.GraphicsAPI {
 			GL.Arb.BufferSubData( BufferTargetArb.ArrayBuffer, IntPtr.Zero, new IntPtr( sizeInBytes ), vertices );
 			
 			BeginVbBatch( format );
-			DrawVbBatch( mode, vb, count );
+			DrawVbBatch( mode, vb, 0, count );
 			EndVbBatch();
 		}
 		
@@ -265,9 +265,9 @@ namespace ClassicalSharp.GraphicsAPI {
 			return GL.Arb.IsBuffer( ib );
 		}
 		
-		public override void DrawVb( DrawMode mode, VertexFormat format, int id, int verticesCount ) {
+		public override void DrawVb( DrawMode mode, VertexFormat format, int id, int offset, int verticesCount ) {
 			BeginVbBatch( format );
-			DrawVbBatch( mode, id, verticesCount );
+			DrawVbBatch( mode, id, offset, verticesCount );
 			EndVbBatch();
 		}
 		
@@ -288,8 +288,8 @@ namespace ClassicalSharp.GraphicsAPI {
 			EnableClientState( VertexFormat.Pos3fTex2fCol4b );
 		}
 		
-		public override void DrawVbBatch( DrawMode mode, int id, int verticesCount ) {
-			drawBatchFunc( mode, id, verticesCount );
+		public override void DrawVbBatch( DrawMode mode, int id, int offset, int verticesCount ) {
+			drawBatchFunc( mode, id, offset, verticesCount );
 		}
 		
 		public override void DrawIndexedVbBatch( DrawMode mode, int vb, int ib, int indicesCount ) {
@@ -312,26 +312,26 @@ namespace ClassicalSharp.GraphicsAPI {
 			GL.Arb.BindBuffer( BufferTargetArb.ElementArrayBuffer, 0 );
 		}
 		
-		void DrawVbPos3fTex2fFast( DrawMode mode, int id, int verticesCount ) {
+		void DrawVbPos3fTex2fFast( DrawMode mode, int id, int offset, int verticesCount ) {
 			GL.Arb.BindBuffer( BufferTargetArb.ArrayBuffer, id );
 			GL.VertexPointer( 3, VertexPointerType.Float, 20, new IntPtr( 0 ) );
 			GL.TexCoordPointer( 2, TexCoordPointerType.Float, 20, new IntPtr( 12 ) );
-			GL.DrawArrays( modeMappings[(int)mode], 0, verticesCount );
+			GL.DrawArrays( modeMappings[(int)mode], offset, verticesCount );
 		}
 		
-		void DrawVbPos3fCol4bFast( DrawMode mode, int id, int verticesCount ) {
+		void DrawVbPos3fCol4bFast( DrawMode mode, int id, int offset, int verticesCount ) {
 			GL.Arb.BindBuffer( BufferTargetArb.ArrayBuffer, id );
 			GL.VertexPointer( 3, VertexPointerType.Float, 16, new IntPtr( 0 ) );
 			GL.ColorPointer( 4, ColorPointerType.UnsignedByte, 16, new IntPtr( 12 ) );
-			GL.DrawArrays( modeMappings[(int)mode], 0, verticesCount );
+			GL.DrawArrays( modeMappings[(int)mode], offset, verticesCount );
 		}
 		
-		void DrawVbPos3fTex2fCol4bFast( DrawMode mode, int id, int verticesCount ) {
+		void DrawVbPos3fTex2fCol4bFast( DrawMode mode, int id, int offset, int verticesCount ) {
 			GL.Arb.BindBuffer( BufferTargetArb.ArrayBuffer, id );
 			GL.VertexPointer( 3, VertexPointerType.Float, 24, new IntPtr( 0 ) );
 			GL.TexCoordPointer( 2, TexCoordPointerType.Float, 24, new IntPtr( 12 ) );
 			GL.ColorPointer( 4, ColorPointerType.UnsignedByte, 24, new IntPtr( 20 ) );
-			GL.DrawArrays( modeMappings[(int)mode], 0, verticesCount );
+			GL.DrawArrays( modeMappings[(int)mode], offset, verticesCount );
 		}
 		
 		static void EnableClientState( VertexFormat format ) {
diff --git a/Model/ModelPart.cs b/Model/ModelPart.cs
index 73f74ef8a..9ac03108f 100644
--- a/Model/ModelPart.cs
+++ b/Model/ModelPart.cs
@@ -16,7 +16,7 @@ namespace ClassicalSharp {
 		}
 		
 		public void Render() {
-			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, VbId, Count );
+			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, VbId, 0, Count );
 		}
 		
 		public void Dispose() {
diff --git a/Rendering/MapEnvRenderer.cs b/Rendering/MapEnvRenderer.cs
index 28ea18f82..bb17d6134 100644
--- a/Rendering/MapEnvRenderer.cs
+++ b/Rendering/MapEnvRenderer.cs
@@ -45,7 +45,7 @@ namespace ClassicalSharp {
 			
 			Graphics.Texturing = true;
 			Graphics.Bind2DTexture( sideTexId );
-			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, sidesVboId, sidesVertices );
+			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, sidesVboId, 0, sidesVertices );
 			Graphics.Texturing = false;
 		}
 		
@@ -55,7 +55,7 @@ namespace ClassicalSharp {
 			Graphics.Texturing = true;
 			Graphics.AlphaBlending = true;
 			Graphics.Bind2DTexture( edgeTexId );
-			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, edgesVboId, edgesVertices );
+			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, edgesVboId, 0, edgesVertices );
 			Graphics.AlphaBlending = false;
 			Graphics.Texturing = false;
 		}
diff --git a/Rendering/StandardEnvRenderer.cs b/Rendering/StandardEnvRenderer.cs
index b17c5a245..8689c0043 100644
--- a/Rendering/StandardEnvRenderer.cs
+++ b/Rendering/StandardEnvRenderer.cs
@@ -29,7 +29,7 @@ namespace ClassicalSharp.Renderers {
 			
 			Vector3 pos = Window.LocalPlayer.EyePosition;
 			if( pos.Y < Map.Height + skyOffset ) {
-				Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fCol4b, skyVbo, skyVertices );
+				Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fCol4b, skyVbo, 0, skyVertices );
 			}
 			RenderClouds( deltaTime );
 			ResetFog();
@@ -97,7 +97,7 @@ namespace ClassicalSharp.Renderers {
 			Graphics.AlphaTest = true;
 			Graphics.Texturing = true;
 			Graphics.Bind2DTexture( cloudTexture );
-			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, cloudsVbo, cloudsVertices );
+			Graphics.DrawVb( DrawMode.Triangles, VertexFormat.Pos3fTex2fCol4b, cloudsVbo, 0, cloudsVertices );
 			Graphics.AlphaTest = false;
 			Graphics.Texturing = false;
 			
diff --git a/Selections/SelectionBox.cs b/Selections/SelectionBox.cs
index 56f668ff9..ccc983f9b 100644
--- a/Selections/SelectionBox.cs
+++ b/Selections/SelectionBox.cs
@@ -27,9 +27,9 @@ namespace ClassicalSharp.Selections {
 		
 		public void Render( double delta ) {
 			Graphics.DepthWrite = false;
-			Graphics.DrawVbBatch( DrawMode.Triangles, VboId, VerticesCount );
+			Graphics.DrawVbBatch( DrawMode.Triangles, VboId, 0, VerticesCount );
 			Graphics.DepthWrite = true;
-			Graphics.DrawVbBatch( DrawMode.Lines, LineVboId, LineVerticesCount );
+			Graphics.DrawVbBatch( DrawMode.Lines, LineVboId, 0, LineVerticesCount );
 		}
 		
 		public SelectionBox( Vector3I start, Vector3I end, FastColour col, IGraphicsApi graphics ) {
diff --git a/Utils/Utils.cs b/Utils/Utils.cs
index 3d0f2419e..24279e2cb 100644
--- a/Utils/Utils.cs
+++ b/Utils/Utils.cs
@@ -6,10 +6,11 @@ using OpenTK;
 namespace ClassicalSharp {
 
 	// NOTE: These delegates should be removed when using versions later than NET 2.0.
-	// ################################################################
-	public delegate void Action<T1, T2>( T1 arg1, T2 arg2 );
+	// ################################################################	
 	public delegate void Action();
+	public delegate void Action<T1, T2>( T1 arg1, T2 arg2 );
 	public delegate void Action<T1, T2, T3>( T1 arg1, T2 arg2, T3 arg3 );
+	public delegate void Action<T1, T2, T3, T4>( T1 arg1, T2 arg2, T3 arg3, T4 arg4 );
 	public delegate TResult Func<TResult>();
 	public delegate TResult Func<T1, TResult>( T1 arg1 );
 	public delegate TResult Func<T1, T2, TResult>( T1 arg1, T2 arg2 );