Java Programing

The JavaMet example, included with this book, uses a cloud of points to simulate simple volume rendering. Each point in the cloud has an associated frequency, and the end user can interactively control which points are rendered by adjusting the upper and lower frequency limits (figure 7.7). Figure 7.7 The JavaMet application renders the red, green, and blue channels of the image on the left as a series of 3D voxels in the 3D view on the right. Each voxel has a frequency associated with it, and the voxel threshold can be interactively modified using the slider below the 3D view 7.2 Performance objectives One of the biggest issues you will face when developing 3D applications is performance, which usually translates to rendering time. Rendering time defines how long the Java 3D renderer will take to render a single frame that is a view of your 3D scene. This, in turn, defines the FPS that will be achievable for your application. For games applications and smooth animation, a rate of 20 or more FPS is desirable. Obviously, the FPS that your application will achieve is inherently linked to the hardware that it is running on. When designing your application it is therefore vital to specify your performance objectives on specific platforms. For example, you might want the application to achieve 30 FPS on a 500 MHz PC running Windows 98 with an nVidia GeForce MX video card. This typical system configuration (or target machine) must be the yardstick by which you judge your application and all the decisions you make while designing your application should be evaluated in the context of their impact on the performance of the application running on your target machine (or machines). During the initial design phase, you should run simulated tests on your target machine to evaluate your design decisions and assess whether the performance objectives are achievable. A trap that developers sometimes fall into is to introduce features that look great on their development machines (which are typically high-end) but cause an overall degradation in performance on users machines (which are typically closer to the performance of the target machine). Almost all 3D applications are interactive, that is, the user is able to influence the current point of view or camera and hence the rendered view. The required frame rate is often related to the mode of user interaction: 104

Note: If you are looking for good and high quality web space to host and run your application check Lunarwebhost Java Web Hosting services