Camera_练习一

 1 // This function is found in the camera class. What we basically do is keep the y position value at 0.0f to force our
 2 // user to stick to the ground.
 3 
 4 ...
 5 // processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
 6 void ProcessKeyboard(Camera_Movement direction, float deltaTime)
 7 {
 8     float velocity = MovementSpeed * deltaTime;
 9     if (direction == FORWARD)
10         Position += Front * velocity;
11     if (direction == BACKWARD)
12         Position -= Front * velocity;
13     if (direction == LEFT)
14         Position -= Right * velocity;
15     if (direction == RIGHT)
16         Position += Right * velocity;
17     // make sure the user stays at the ground level
18     Position.y = 0.0f; // <-- this one-liner keeps the user at the ground level (xz plane)
19 }
20 ...