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The answer is that XNA has a built-in mechanism for ensuring that objects in the front of the scene automatically hide any objects that fall behind them. This happens regardless of the order in which objects are drawn: objects drawn behind existing objects can still be partially (or totally) obscured even though they might be rendered after the object in front. XNA achieves this effect by using a feature known as the depth buffer. It can be enabled or disabled, and is enabled by default. When rendering simple 2D graphics, the depth buffer might be unnecessary, but in 3D scenes it is almost certain to be required. Just as the color of each rendered pixel is written into a graphical buffer for display on the screen, so the distance into the screen of each rendered pixel is written into a corresponding depth buffer when the buffer is enabled. For each individual pixel that it is about to render, XNA checks the depth of the pixel against the depth already stored in the buffer. If it finds that the new pixel is farther away than the pixel already in the buffer, the new pixel is not rendered to the screen; otherwise, the pixel is rendered and the depth buffer updated to remember the new depth of the pixel. This per-pixel depth checking can be clearly seen in the DepthBuffer example project, shown in Figure 7 10. This figure displays two rotating cubes, positioned so that they intersect one another; and below them a third cube, squashed to form a floor. Observe the behavior when the cubes intersect one another: at every single pixel position, the frontmost cube surface is always displayed.

createCoords() generates the floor s (x, y, z) coordinates by utilizing the heights map. As shown in Figures 6-9 and 6-10, the heights[][] array is treated as an (x, z) grid of heights and translated into a coordinates mesh starting at (-FLOOR_LEN/2, -FLOOR_LEN/2): private Point3f[] createCoords() { Point3f[] coords = new Point3f[FLOOR_LEN*FLOOR_LEN*4]; // since each quad has 4 coords int i = 0; for(int z=0; z <= FLOOR_LEN-1; z++) { // skip z's front row for(int x=0; x <= FLOOR_LEN-1; x++) { // skip x's right column createTile(coords, i, x, z);

is currently no SHOW CREATE or SHOW STATUS for triggers, as there is for tables, views, stored procedures, and so forth.

Figure 7 10. The effect of the depth buffer on intersecting objects The way that intersecting objects are handled can be very useful. For example, if you want to draw a landscape scene with water such as lakes or an ocean, the ground can be drawn in its entirety (the parts that are above the water level and also those that are below) and then a single semitransparent flat plane can be drawn at the water level across the entire scene. Only those parts of the scene that are below the water level will be affected by the water plane, providing a reasonably convincing approximation of water with very little complexity or processor cost.

If you need to modify one of your triggers, you must first issue a DROP statement, and then a CREATE statement to redefine the trigger. The SQL:2003 standard does not provide for something like an ALTER TRIGGER or CREATE OR REPLACE TRIGGER statement to drop and create a trigger in one statement. The DROP TRIGGER statement is similar to the statement for dropping a table, database, or view. In a DROP TRIGGER statement, the table name must be prepended to the name of the trigger: DROP TRIGGER <table name>.<trigger name> For example, to drop the after_customer_update trigger we created for the customer table in the shop database, first make the shop database active: mysql> USE shop;

i = i + 4; } } return coords; }

Most of the time when you are rendering objects in your game, you will want the depth buffer to be available and active. Without it, distant objects will appear in front of nearer objects, destroying the illusion of the 3D world that you are trying to render.

Once you are in the shop database, you can drop the trigger using the table and trigger name: mysql> DROP TRIGGER customer.after_customer_update; You may have noticed that we didn t just prepend the database name in front of the table name. Unlike other DROP commands, where you can prefix the database name to the table or other item, you cannot drop a trigger unless the currently active database contains the table associated with the trigger.