Allow placing blocks off map bedrock sides. (Thanks MrGoober)

ClassicalSharp/ClassicalSharp.csproj

@@ -218,10 +218,10 @@
     <Compile Include="Commands\CommandManager.cs" />
     <Compile Include="Commands\CommandReader.cs" />
     <Compile Include="Network\Utils\NetWriter.cs" />
-    <Compile Include="Physics\BoundingBox.cs" />
-    <Compile Include="Physics\IntersectionUtils.cs" />
-    <Compile Include="Physics\PickedPos.cs" />
-    <Compile Include="Physics\Picking.cs" />
+    <Compile Include="Math\BoundingBox.cs" />
+    <Compile Include="Math\IntersectionUtils.cs" />
+    <Compile Include="Math\PickedPos.cs" />
+    <Compile Include="Math\Picking.cs" />
     <Compile Include="Platform\Font.cs" />
     <Compile Include="Platform\IPlatformWindow.cs" />
     <Compile Include="Platform\Platform.cs" />
@@ -236,10 +236,10 @@
     <Compile Include="Rendering\FrustumCulling.cs" />
     <Compile Include="Rendering\MapBordersRenderer.cs" />
     <Compile Include="Rendering\MapRenderer.cs" />
-    <Compile Include="Rendering\PickingRenderer.cs" />
     <Compile Include="Rendering\StandardEnvRenderer.cs" />
     <Compile Include="Rendering\WeatherRenderer.cs" />
     <Compile Include="Selections\AxisLinesRenderer.cs" />
+    <Compile Include="Selections\PickedPosRenderer.cs" />
     <Compile Include="Selections\SelectionBox.cs" />
     <Compile Include="Selections\SelectionBoxComparer.cs" />
     <Compile Include="Selections\SelectionManager.cs" />
@@ -301,7 +301,7 @@
     <Folder Include="TexturePack" />
     <Folder Include="Singleplayer" />
     <Folder Include="Utils" />
-    <Folder Include="Physics" />
+    <Folder Include="Math" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\OpenTK\OpenTK.csproj">

ClassicalSharp/Game/Game.Properties.cs

@@ -69,7 +69,7 @@ namespace ClassicalSharp {
 		public CommandManager CommandManager;
 		public SelectionManager SelectionManager;
 		public ParticleManager ParticleManager;
-		public PickingRenderer Picking;
+		public PickedPosRenderer Picking;
 		public PickedPos SelectedPos = new PickedPos(), CameraClipPos = new PickedPos();
 		public ModelCache ModelCache;
 		internal string skinServer, chatInInputBuffer = null;

ClassicalSharp/Game/Game.cs

@@ -144,7 +144,7 @@ namespace ClassicalSharp {
 			Culling = new FrustumCulling();
 			EnvRenderer.Init();
 			MapBordersRenderer.Init();
-			Picking = new PickingRenderer( this );
+			Picking = new PickedPosRenderer( this );
 			AudioPlayer = new AudioPlayer( this );
 			LiquidsBreakable = Options.GetBool( OptionsKey.LiquidsBreakable, false );
 			AxisLinesRenderer = new AxisLinesRenderer( this );

ClassicalSharp/Math/Picking.cs

@@ -112,7 +112,7 @@ namespace ClassicalSharp {
 							case CpeBlockFace.ZMin:
 								pickedPos.IntersectPoint.Z -= adjust; break;
 							case CpeBlockFace.ZMax:
-								pickedPos.IntersectPoint.Z += adjust; break;	
+								pickedPos.IntersectPoint.Z += adjust; break;
 						}
 						return;
 					}
@@ -125,7 +125,7 @@ namespace ClassicalSharp {
 		}
 		
 		static void CalcVectors( Vector3 origin, Vector3 dir, out Vector3I step,
-		                           out Vector3I cellBoundary, out Vector3 tMax, out Vector3 tDelta ) {
+		                        out Vector3I cellBoundary, out Vector3 tMax, out Vector3 tDelta ) {
 			Vector3I start = Vector3I.Floor( origin );
 			// Determine which way we go.
 			step.X = Math.Sign( dir.X ); step.Y = Math.Sign( dir.Y ); step.Z = Math.Sign( dir.Z );
@@ -174,11 +174,15 @@ namespace ClassicalSharp {
 			if( x >= 0 && z >= 0 && x < map.Width && z < map.Length ) {
 				if( y >= map.Height ) return 0;
 				if( y >= 0 ) return map.GetBlock( x, y, z );
-				
-				// special case: we want to be able to pick bedrock when we're standing on top of it
-				if( origin.Y >= 0 && y == -1 )
+				if( map.SidesBlock != Block.Air && y == -1 ) 
 					return (byte)Block.Bedrock;
 			}
+			if( map.SidesBlock == Block.Air ) return 0;
+			
+			bool validX = (x == -1 || x == map.Width) && (z >= 0 && z < map.Length);
+			bool validZ = (z == -1 || z == map.Length) && (x >= 0 && x < map.Width);
+			if( y >= 0 && y < Math.Max( 1, map.SidesHeight ) && (validX || validZ) )
+				return (byte)Block.Bedrock;
 			return 0;
 		}
 	}

ClassicalSharp/Selections/PickedPosRenderer.cs

@@ -4,13 +4,13 @@ using OpenTK;
 
 namespace ClassicalSharp.Renderers {
 	
-	public class PickingRenderer : IDisposable {
+	public sealed class PickedPosRenderer : IDisposable {
 		
 		IGraphicsApi graphics;
 		Game game;
 		int vb;
 		
-		public PickingRenderer( Game game ) {
+		public PickedPosRenderer( Game game ) {
 			graphics = game.Graphics;
 			vb = graphics.CreateDynamicVb( VertexFormat.Pos3fCol4b, verticesCount );
 			this.game = game;