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The vast majority of 3D games use a perspective projection to display their graphics. Just as in the real world, this projection simulates the application of perspective to objects rendered within the game, so that objects that are farther away appear smaller than objects that are closer. In addition to this obvious size effect, the more subtle effects of perspective are picked up intuitively by the brain and add a substantial feeling of depth to the rendered scene. The sides of a cube will very slightly narrow due to the effects of perspective as they increase in distance from the viewer, allowing the brain to automatically determine the exact position in which the cube is situated.

Data types after operation names represent the type of data returned by the function call For example, in + SetAddress(String): void, a parameter (argument) of type String is passed to the function named SetAddress Once SetAddress has completed its operation, it returns the special data type void (meaning that the operation returns nothing) Of particular interest to the database designer are the lines connecting each class These lines represent the relationship between classes The numbers on each side of the lines describe the relationship between the elements A single number 1 represents that the class on the opposite end of the line must contain exactly one reference to an object of the class that the number 1 is closest to In Figure 1-1, you can see that an Order must contain exactly one reference to a Customer This makes sense: an order can be placed by only a single customer.

When we use a perspective projection in XNA, we create as part of the Effect object initialization a three-dimensional volume known as a viewing frustum. The shape of the frustum is that of a rectangular cone with its tip cut off. A demonstration of such a frustum is shown in Figure 7 1.

Multiplicity, or the relationship of one object to zero or more other objects, is represented by the minimum number of related objects, two dots, then the maximum number of related objects (or *, which represents an infinite number) Therefore, 0.* means that an instance of the class on the opposite end of the line can be related to zero up to an infinite number of objects on the side of the line where 0.* is located In Figure 1-1, you see that 0.* is next to the Order class on the line between Customer and Order This means that a Customer may be related to zero or more orders The phrases on the association lines are optional, and represent, in human terms, the relationship between the classes Read them like so: opposite class name + phrase + closest class name.

private void createSceneGraph() {

Camera Figure 7 1. A diagram showing a 3D viewing frustum The frustum can be visualized in the real world by imagining yourself looking through a window. Outside the window you can see the ground and various objects. The farther away into the distance you look, the wider the area that you can see. Objects that are too far to the side, above, or below will be hidden by the window frame. Objects that fall inside the volume described by the frustum are visible to the camera (and would be visible through the window). Objects that fall outside the frustum volumes are hidden from the camera (and would not be able to be seen through the window). The near and far clip planes are also taken into account when deciding whether objects are visible. Objects nearer to the camera than the near clip plane are deemed to be too close and are excluded from rendering. Similarly, objects farther than the far clip plane are too far away to be seen and are once again excluded.

So, in Figure 1-1, the association line between Customer and Order can be phrased in either of these ways: Customer Can Place Order Order Can Be Placed By Customer The phrases simply provide an alternate way of describing the relationship between the class objects Also notice the black diamond on the connecting line between OrderItem and Order in Figure 1-1 The diamond represents aggregation, and it means that objects of the class at the end of the line closest to the diamond are partly composed of objects from the other end of.

CHAPTER 2 s GET A LIFE (IN 3D)