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This chapter examined several ways of enhancing a 3D scene. I presented three techniques for making backgrounds: using a textured sphere, a skybox built from a box, and a skybox utilizing quads. The latter method allows the floor and skyline to be constructed from images exported from Terragen, a freeware photorealistic landscape (and sky) renderer. The scene was decorated with Wavefront OBJ models and fake 3D trees and bushes, which are actually 2D images that always stay orientated toward the viewer. I left Java 3D s OrbitBehavior class behind and implemented a simple behavior for processing key presses and moving the camera in response. I use variants of this KeyBehavior class in several future chapters.

There s a principle in diagnosing and identifying problems in application code that is worth repeating here before we get into the profiling tools you ll be using. When you see the results of a profiler trace, you ll be presented with information that will show you an application block broken down into how many times a function (or SQL statement) was called, and how long the function call took to complete. It is extremely easy to fall into the trap of overoptimizing a piece of application code, simply because you have the diagnostic tools that show you what s going on in your code. This is especially true for PHP programmers who see the function call stack for their pages and want to optimize every single function call in their application. Basically, the rule of thumb is to start with the block of code that is taking the longest time to execute or is consuming the most resources. Spend your time identifying and fixing those parts of your application code that will have noticeable impact for your users. Don t waste your precious time optimizing a function call that executes in 4 milliseconds just to get the time down to 2 milliseconds. It s just not worth it, unless that function is called so often that it makes a difference to your users. Your time is much better spent going after the big fish. That said, if you do identify a way to make your code faster, by all means document it and use that knowledge in your future coding. If time permits, perhaps think about refactoring older code bases with your newfound knowledge. But always take into account the value of your time in doing so versus the benefits, in real time, to the user.

Listing 14 35. Applying the animation speed setting internal void BeginTranslate() { double animSpeed = 1; // Reduce the translation duration if in fast animation mode if (SettingsManager.GetValue("AnimSpeed", "Normal") == "Fast") animSpeed = 0.4; // Is there any translation to do if (XOffset != 0 || YOffset != 0) { _diamondSprite.BeginTranslate(XOffset, YOffset, 0, 0, TranslateDuration * animSpeed, 0, TranslateEasing); } } The sound effect control is handled in the GamePage s Loaded event. It simply sets the AudioPlayer.SoundEffectMasterVolume property to 1 if sound effects are enabled or 0 if they are disabled. No further processing for this setting is needed. Listing 14 36 shows this piece of code. Listing 14 36. Switching sound effects on or off private void GameCanvas_Loaded(object sender, RoutedEventArgs e) { // Now that the page has loaded, reset the game so that we have some diamonds to // display InitializeDiamonds(); // Add an event handler for the CompositionTarget's Rendering event so that // we can keep the game moving CompositionTarget.Rendering += new EventHandler(compositionTarget_Rendering); // Set the sound effect volume level AudioPlayer.SoundEffectMasterVolume = (SettingsManager.GetValue("Sound", true) 1 : 0); }

private void playSound() { if ((soundFnm != null) && !isSoundPlaying) { soundExecutorexecute( new Runnable() { public void run() { isSoundPlaying = true; int sndLen = soundsPlayergetLength(soundFnm); if (sndLen == -1) sndLen = 1000; // reasonable waiting time (1 sec) soundsPlayerplay(soundFnm); try { Threadsleep(sndLen); // wait for sound to finish } catch(InterruptedException ex) {} isSoundPlaying = false; } }); } // end of playSound() playSound() gets the worker thread to play the collision sound, thereby allowing the rest of the application to continue executing Unfortunately, there s still a difficulty, which is solved with the isSoundPlaying boolean in playSound() Although the worker thread created with ExecutorsnewSingleThreadExecutor() is guaranteed to execute its tasks sequentially, there s no limit on how many tasks can be added to the pool s queue.