Now, your project manager wants to view the spaceship rotating in a Silverlight application. However, as you have learned about cameras, he wants you to create the rotation effect through the camera and not by rotating the model.
Luckily, Balder offers a simple Camera class that allows us to control the position and the target without the need to make complex math calculations:
1. Open the
3DInvadersSilverlightproject.2. Open the code for the
InvadersGameclass.3. Add the following lines to define a private variable:
// The camera's angle expressed in radians private double _cameraAngleRadians = 0;
4. Replace the code that defined some properties for
Camerain theLoadContentmethod with the following:// Define the camera's target (0; -5; 0) Camera.Target.X = 0; Camera.Target.Y = -5; Camera.Target.Z = 0; // Define the stable camera's position in the Y-axis Camera.Position.Y = 35f;
5. Replace the code for the
Updatemethod with the following...