.NET/Java PDF, Tiff, Barcode SDK Library

Additionally, a mesh has a collection of effects, so it can render different parts of the mesh with different effects a useful thing for complex meshes. Because you might have many effects for a single mesh, you need to have a second loop, running through all effects of each mesh, to be certain you ll apply the same effect in all mesh parts. In a simple model such as your cube, you have only one mesh and only one effect on this mesh. Nonetheless, you ll create generic code that allows you to use the same program for more complex models. The final code with the effect creation and use follows. Place it in the LoadContent method: // Calculate the aspect ratio for the model float aspectRatio = (float)graphics.GraphicsDevice.Viewport.Width / graphics.GraphicsDevice.Viewport.Height; // Configure basic lighting and do a simple rotation for the model // (so it can be seen onscreen) foreach (ModelMesh mesh in myModel.Meshes) foreach (BasicEffect effect in mesh.Effects) { // Rotate and make the model a little smaller (50%) effect.World = Matrix.CreateScale(0.5f) * Matrix.CreateRotationX(MathHelper.ToRadians(45.0f)) * Matrix.CreateRotationY(MathHelper.ToRadians(45.0f)); // Set the projection matrix for the model effect.Projection = Matrix.CreatePerspectiveFieldOfView( MathHelper.ToRadians(45.0f), aspectRatio, 1.0f, 10.0f); effect.View = Matrix.CreateLookAt(new Vector3(0.0f, 0.0f, 3.0f), Vector3.Zero, Vector3.Up); effect.EnableDefaultLighting(); } Figure 8-18 presents the result of running the program with the newly created effect.

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Note You don t need to bother to load textures if your model uses them. Model files already include information about the textures they use. Because this information includes the path where the texture files should be located, you just need to know this path and then copy the texture files to the corresponding path. You can find out the texture paths by examining the model files (in a text editor, for example) or by including the model in the project and compiling it. XNA Game Studio presents the Content Pipeline path errors stating where the model looked for the textures.

John Strange is new to the company and has been asked to fill in his timesheet for his first day s work. Jane has sent him an e-mail with his login details (jstrange/password) and he enters these into the login page. Upon logging in, he is presented with the (empty) home page and chooses Manage Timesheets from the menu. As a new user, he has no timesheets listed on this page, so he chooses Create Timesheet from the menu. This presents him with the page shown in Figure 2-3.

Summary

He enters a note stating that this is his first timesheet and clicks the Create Timesheet button. He is returned to the Manage Timesheets page, where his timesheet now appears in the list. Selecting this timesheet, he can now see his (empty) timesheet. He selects the Add Period command in order to add his day s working details. He amends the start and finish time to match his working day (entering the office at 9 a.m. sharp and leaving at 7 p.m. in order to look keen on his first day). He adds a note explaining that this is his first day, and as he is an agency worker sets his rate to $40 an hour (standard pay). He will now see the updated view of the timesheet shown in Figure 2-4.

In this chapter, you learned the basics of 3D graphics programming. Although XNA provides you with many built-in classes and methods that reduce the program s complexity, there are still a lot of concepts to understand. Be sure you understand the following concepts before you go on to the next chapter: What vertices are and what type of information can be used when defining them What a vertex buffer is and how to use it Why matrices are important, and how to use them to perform transformations in 3D objects What the projection matrix is, which types of projections XNA supports, and how to use them What the view matrix is and how you create it in XNA What the world matrix is, and how to use it to perform operations in all 3D scenes What models and meshes are, and how to load and render them in XNA

The system returns him to the Manage Timesheet page, where he selects the link to the timesheet again and checks that his changes have been recorded correctly. After he is satisfied that they are, he chooses Logout from the menu and goes home (even though it s only 5 p.m.).

In the next chapters, you ll create a complete 3D game, so you ll be able to better exercise and explore these concepts.

The example application project was built and managed by using the Maven 2 software project management tool. Maven provides a large number of facilities, in a sense a limitless number because it is extensible, but the important ones that we are concerned with are related to managing the build. I decided to use Maven 2 for this process primarily because it eliminates the need to include minutely detailed lists of the JAR files that must be downloaded when building an application.