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It will sometimes be useful to draw objects that are entirely reflective and that have no texture of their own visible at all This can be achieved by setting the EnvironmentMapAmount to 1, but it is still necessary to have a texture applied to the object itself, or else the object will appear completely black There are two things we can do to address this problem The first is to create a 1-x-1-pixel white dummy texture and apply it to the objects in question They will therefore be textured (in white), so the environment mapping will apply as required The only real downside is that the dummy texture needs to be loaded into the graphics hardware, replacing any other texture that might already be there That other texture might then need to be subsequently reloaded, causing a performance hit.

The GamePadViewer class is the top-level JFrame, which constructs its GUI from a ButtonsPanel for the buttons, and three instances of CompassPanel for the POV hat and two sticks. The rumbler is managed by GamePadViewer. GamePadViewer periodically polls GamePadController and gathers data about the hat, sticks, and buttons. It passes that data to the GUI objects via ButtonsPanel.setButtons() and CompassPanel.setCompass(), which update their GUI elements. GamePadViewer monitors the rumbler check box itself and calls GamePadController. setRumbler() when necessary.

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The other alternative is to leave whatever texture is already in the graphics hardware active so that it will apply to the object being rendered This texture might, of course, be entirely unsuitable for the new object, which probably hasn t been set up with any texture coordinates at all To prevent it from causing unpredictable results, we can configure the environment mapping settings for the object to have an EnvironmentMapAmount of 1 and a FresnelFactor of 0 This will cause the environment map to completely overpower the object texture so that it has no visible effect whatsoever The game framework will set the environment map properties in this way if it detects that no texture has been set for the object being rendered.

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The GamePadViewer constructor creates the GUI and initiates polling of the gamepad by calling startPolling(): // globals private GamePadController gpController; private Timer pollTimer; // timer which triggers the polling

It is essential that there are other objects within the scene that do activate a texture within the EnvironmentMapEffect, however, so that a texture is set prior to the object being rendered If this is not the case, a dummy texture will need to be applied as described previously..

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public GamePadViewer() { super("GamePad Viewer"); gpController = new GamePadController(); makeGUI(); addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { pollTimer.stop(); // stop the timer System.exit(0); } }); pack(); setResizable(false); setVisible(true); startPolling(); } // end of GamePadViewer() startPolling() uses a timer (pollTimer) to schedule the polling, which needs to be stopped when the application exits. The GUI is conventional Swing code so won t be described in detail here. GamePadViewer utilizes the ButtonsPanel class to manage the button text fields, and three instances of CompassPanel for the POV hat and sticks: // globals for the GUI private CompassPanel xyPanel, zrzPanel, hatPanel; // shows the two analog sticks and POV hat private ButtonsPanel buttonsPanel; private JCheckBox rumblerCheck;

The final effect is the SkinnedEffect. This effect doesn t provide graphical effects in the way that the other effects have, but rather allows models that contain multiple bones to be controlled such that each bone can be moved around its joints to position complex models into different poses. Creating models such as these is beyond the scope of this book, so we will not be going into any further detail about this particular effect. If you want to learn more and see the effect in action, take a look at the XNA Reach Graphics Demo, which can be found by pointing your web browser at http://create.msdn.com/en-US/education/catalog/sample/reach_graphics_demo and downloading the source code at the bottom of the page.

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private void makeGUI() {

We have nearly finished our journey through XNA s matrix-based rendering now, but there is one final topic to cover: mixing rendering from sprites and from matrix-based graphics together at the same time. There are obvious uses to rendering sprites and matrices together: 3D games will frequently need to display text, for example, and it is likely that 2D status overlays (energy bars, number of lives left, and so on) might be useful, too. XNA allows us to achieve this by rendering sprites and 3D objects together into the same scene. Simply draw the 3D objects first and then draw the sprites afterward. Both will render exactly as you would expect, with the sprites appearing on top of any 3D objects that have already been rendered onscreen. XNA s sprite renderer does, however, make some changes to the state of the rendering engine, and they will most likely need some minor additional changes to your code to compensate. When XNA begins rendering sprites, it reconfigures the environment as follows: