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As an example, let s run a benchmark comparing the performance of two simple scripts, finduser1.php (shown in Listing 6-10) and finduser2.php (shown in Listing 6-11), which select records from the http_auth table we populated earlier in the section about Super Smack. The http_auth table contains 90,000 records and has a primary key index on username, which is a char(25) field. Each username has exactly 25 characters. For the tests, we ve turned off the query cache, so that it won't skew any results. We know that the number of records that match both queries is exactly 146 rows in our generated table. However, here we re going to do some simple benchmarks to determine which method of retrieving the same information is faster.

Tip If you are unsure about which URI to use, simply add a Sprite or an Image control to the page and browse to the required graphic using the Source property editor in the Properties window. The full URI for the selected image will be displayed in the image chooser window s Path field.

One ambient and two directional lights are added to the scene by lightScene(). An ambient light reaches every corner of the world, illuminating everything equally: private void lightScene() { Color3f white = new Color3f(1.0f, 1.0f, 1.0f); // Set up the ambient light AmbientLight ambientLightNode = new AmbientLight(white); ambientLightNode.setInfluencingBounds(bounds); sceneBG.addChild(ambientLightNode); // Set up the directional lights Vector3f light1Direction = new Vector3f(-1.0f, 1.0f, -1.0f); // light coming from left, up, and back quadrant Vector3f light2Direction = new Vector3f(1.0f, 1.0f, 1.0f); // light coming from right, up, and front quadrant DirectionalLight light1 = new DirectionalLight(white, light1Direction); light1.setInfluencingBounds(bounds); sceneBG.addChild(light1); DirectionalLight light2 = new DirectionalLight(white, light2Direction); light2.setInfluencingBounds(bounds); sceneBG.addChild(light2); } // end of lightScene() The color of the light is set and the ambient source is created along with bounds and added to the scene. The Color3f() constructor takes red/green/blue (RGB) values between 0.0f and 1.0f (1.0f being full-on ). A directional light mimics a light from a distant source, hitting the surfaces of objects from a specified direction. The main difference from an ambient light is the requirement for a direction, such as in the following: Vector3f light1Direction = new Vector3f(-1.0f, 1.0f, -1.0f); // light coming from left, up, and back quadrant The direction is the vector starting at the specified coordinate, pointing toward (0, 0, 0); the light can be imagined to be multiple parallel lines with that direction, originating at infinity. Point lights and spotlights are the other forms of Java 3D lighting. Point lights position the light in space, emitting in all directions. Spotlights are focused point lights aimed in a particular direction.

Note If you re not familiar with the REGEXP function, head over to http://dev.mysql.com/doc/mysql/

This resource-based approach allows the same embedded graphic file to be used for sprites created both at design time and at runtime. If you only need to use the graphic for runtime objects, you might choose to add it as Content and use the simpler code shown in Listing 13 13.

A background for a scene can be specified as a constant color (as in the method given next), a static image, or a texture-mapped shape such as a sphere: private void addBackground() /* The choice of background color is obtained from the

en/regexp.html. You ll see that the SQL statements in the two scripts in Listings 6-10 and 6-11 produce

Note The BitmapImage class referenced in these listings is contained within the System.Windows.Media.Imaging namespace, and the StreamResourceInfo class is contained within System.Windows.Resources. To use these unqualified as they are here, add these two namespaces to the source file with the using keyword.

CHAPTER 2 s GET A LIFE (IN 3D)

Listing 6-10. finduser1.php < php // finduser1.php $conn = mysql_connect("localhost","test","") or die (mysql_error()); mysql_select_db("test", $conn) or die ("Can't use database 'test'"); $result = mysql_query("SELECT * FROM http_auth WHERE username LIKE 'ud%'"); if ($result) echo "found: " . mysql_num_rows($result); else echo mysql_error(); >

The Sprites example project shows a number of different sprite configurations based on all the features that we have discussed in this section. A screenshot from the project is shown in Figure 13 5.

Listing 6-11. finduser2.php < php // finduser2.php $conn = mysql_connect("localhost","test","") or die (mysql_error()); mysql_select_db("test", $conn) or die ("Can't use database 'test'"); $result = mysql_query("SELECT * FROM http_auth WHERE username REGEXP '^ud'"); if ($result) echo "found: " . mysql_num_rows($result); else echo mysql_error(); >