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If you look back at the vertices defined for the front face of the cube in Figure 7 7, you will see that both of the triangles have their vertices defined in clockwise order. This is by design, of course. With our triangles specified correctly, XNA will automatically ignore those triangles that face away from us. The HiddenSurfaceCulling project draws yet another cube, but this time it omits the final triangle from the cube (it tells DrawUserPrimitives to draw 11 triangles instead of 12), resulting in a triangular hole. We can look through this hole to the interior of the cube to see exactly what XNA is drawing for the reverse sides of the cube triangles. If you run this project, you will see that the orange side of the cube that contains the missing triangle shows nothing behind it whatsoever (see Figure 7 13). Clearly, XNA shows the triangles only when they are actually facing toward us.

2. MySQL doesn t actually use the FIND_IN_SET() function, but rather does a bitwise & operation on the privileges loaded into memory for the queried user. We use the FIND_IN_SET() function here to demonstrate the concept.

Figure 7 13. The rear faces of the cube s triangles have been culled. Sometimes it is useful to draw the rear surfaces of triangles, too. If you have objects that are completely flat and need to be viewed from in front or behind, or if you have objects that are hollow and whose interior can be seen, we can configure XNA to render both surfaces of each triangle. To instruct XNA to render in this way, we need to disable surface culling. Culling is controlled by the GraphicsDevice.RasterizerState.CullMode property, which accepts one of these values: CullCounterClockwiseFace (the default), CullClockwiseFace (the reverse; culls faces that are defined in clockwise order), or None (the value we need here; none of the faces is culled). Just as with the BlendState and SamplerState objects we saw in the last chapter, the RasterizerState object s properties all become read-only once the object has been set into the GraphicsDevice. We therefore can t update the properties of the existing object. Instead, we create a new object, configure it as required, and then set the whole object into the GraphicsDevice, as shown in Listing 7 5.

Movement requests are sent to the grabbers either from the keyboard or the gamepad. Instead of having the grabbers deal with their data directly, the information is converted into GrabberOp instances. This enforces a clean separation between the input sources (the keyboard and gamepad) and the input s processing in Grabbers. The Grabbers code becomes much less convoluted, and it s straightforward to add new input sources, such as the mouse or a data glove.

However, there are times when it is necessary to create what are known as stop lists, or lists of items to which access specifically is denied. mysql.host can be used to create just such lists for domains, regardless of the user part of the identification label. Let s say we have three server hosts in our network: sales.example.com, intranet.example.com, and public.example.com. Of these, the only server that we don t want to have access to any databases is public.example.com, as it poses a security risk. So, we run the following code: mysql> mysql> -> -> -> INSERT INTO mysql.host SET Host='public.example.com', Db='%'; INSERT INTO mysql.host SET Host='%.example.com', Db='%' , Select_priv='Y', Insert_priv='Y', Update_priv='Y', Delete_priv='Y' , Create_priv='Y', Drop_priv='Y', Index_priv='Y',Alter_priv='Y' , Create_tmp_table_priv='Y';

Listing 7 5. Disabling hidden surface culling // Create and activate a new RasterizerState with a different cull mode. RasterizerState rs = new RasterizerState(); rs.CullMode = CullMode.None; GraphicsDevice.RasterizerState = rs; You will find this code present but commented out within the HiddenSurfaceCulling project s Initialize function. Uncomment it so that it becomes active and then run the project again. Now you will find when the orange face is toward you that you can see through the missing triangle into the fully rendered interior of the cube, as shown in Figure 7 14.

The keyboard, the gamepad, and the grabbers are connected in addGrabbers() in WrapArmsPad3D. The relevant code fragment is shown here: // in addGrabbers() in WrapArmsPad3D GamePadController gamePad = new GamePadController(); Grabbers grabbers = new Grabbers(. . .); // Grabbers input arguments will be explained later // set up gamepad behavior to catch gamepad input GamePadBehavior gamePadBeh = new GamePadBehavior(grabbers, gamePad); gamePadBeh.setSchedulingBounds(bounds); sceneBG.addChild(gamePadBeh); // set up keyboard controls to catch keyp resses KeyBehavior keyBeh = new KeyBehavior(grabbers); keyBeh.setSchedulingBounds(bounds); sceneBG.addChild(keyBeh); KeyBehavior sends key presses to the grabbers as GrabberOp instances, while GamePadBehavior does the same for gamepad input.